Cooling system for working fluid used in automatic transmission of automotive vehicle

专利摘要:
PURPOSE: To provide a hydraulic fluid cooling device for automatic transmission for vehicle, which is capable of ensuring a sufficient amount of hydraulic fluid flowing in the circuit corresponding to the fluid temperature and line pressure, thus making it possible to attain effective hydraulic and lubricating operations of an automatic transmission. CONSTITUTION: This hydraulic fluid cooling device, which includes a water-cooling oil cooler and an air-cooling oil cooler connected in series with each other and cools down the hydraulic fluid circulating in an oil pump of the automatic transmission for vehicle, an oil pressure control circuit and a lubricating circuit of the transmission mechanism, is provided with the following two valves: a cooler bypass valve which lets the hydraulic fluid circulate an oil pressure control circuit and a lubricating circuit by bypassing both of the water-cooling oil cooler and the air-cooling oil cooler, only in the case where the hydraulic fluid temperature is under the specified value and the hydraulic fluid line pressure in the oil pump is over the specified value. A bypass valve, which detects the hydraulic fluid temperature and lets the hydraulic fluid circulate the oil pump, the oil pressure control circuit and the lubricating circuit by bypassing only the air-cooling oil cooler, in the case where the detected hydraulic fluid temperature is under the specified value.
公开号:KR20020072223A
申请号:KR1020020012369
申请日:2002-03-08
公开日:2002-09-14
发明作者:와까야마히데시
申请人:쟈트코 가부시키가이샤；
IPC主号:

专利说明:

COOLING SYSTEM FOR WORKING FLUID USED IN AUTOMATIC TRANSMISSION OF AUTOMOTIVE VEHICLE}
[15] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission fluid cooling system for automobiles, in particular a water-cooled oil cooler and an air-cooled oil cooler, which are connected to each other in series and which can cool working fluid circulating through the transmission oil pump, hydraulic control circuit and lubrication circuit in the transmission. It relates to a transmission fluid cooling system having a.
[16] As shown in Fig. 4, the transmission fluid cooling system 30 often uses both a water-cooled oil cooler 31 and an air-cooled oil cooler 32 fluidly connected in series to each other for improved cooling performance. The water-cooled oil cooler 31 functions to remove heat from the working fluid by forced circulation of the engine coolant. The air cooled oil cooler 32 functions to cool the working fluid by in close contact with a large amount of external air. The oil coolers 31, 32 are fluidly connected to the control valve 35 and the lubrication circuit 36 in the automatic transmission 33 via the hydraulic line 37. The control valve 35 is integrated into the control valve body 34 included in the hydraulic control circuit laid out on the automatic transmission 33. An oil pump 38 is provided to pressurize and deliver the working fluid to the hydraulic line through the outlet port. The working fluid discharged from the oil pump 38 circulates in the order of the control valve 35, the water-cooled oil cooler 31, the air-cooled oil cooler 32, and the lubrication circuit 36 (see FIG. 4). The working fluid pressure generated from the oil pump 38 is called "line pressure". In other words, the line pressure is produced on the working fluid in the connecting line 39 between the inlet port of the control valve 35 and the outlet port of the oil pump 38. Hydraulic pressure that is substantially proportional to and less than the line pressure is generated in the working fluid in the hydraulic line 40 from the outlet port of the control valve 35 to the water cooled oil cooler 31. The transmission fluid cooling system 30 also includes a bypass valve 41 and a relief valve 42. Bypass valve 41 is configured as an oil temperature sensing element with bypass valve 41. The oil temperature sensing element integrated in the bypass valve 41 can sense the working fluid temperature. When the temperature value of the working fluid temperature detected by the oil temperature sensing element of the bypass valve 41 is low, the bypass valve 41 causes the working fluid to bypass the water-cooled oil cooler 31 and the air-cooled oil cooler 32. Fully open to allow circulation through the bypass valve through the oil passage in the automatic transmission 33 while passing. This enhances engine preheating performance and prevents overcooling of the working fluid. Pressure relief valve 42 is provided to prevent excessive rise in line pressure. When the line pressure exceeds the set pressure level of the relief valve 42, the relief valve causes the working fluid to flow through the oil passage in the automatic transmission 33 bypassing only the air-cooled oil cooler 32. And fully open to allow circulation via the relief valve 42.
[17] 5, there is shown a schematic of the opening and closing characteristics of the bypass valve 41 and relief valve 42 according to the line pressure and the working fluid temperature. As can be seen from the characteristic diagram of FIG. 5, there are four control mode regions A, B, C, D in the transmission fluid cooling system 30 of FIG. In the first control mode region A where the engine is cooled and the working fluid temperature is very low, the bypass valve 41 opens in response to the temperature sensed by the oil temperature sensing element attached to the bypass valve 41. The working fluid is allowed to flow via the bypass valve 41 passing through the oil passages in the automatic transmission 33 while bypassing the two oil coolers 31, 32. In the region B in which the working fluid temperature rises to some extent while the line pressure does not reach the predetermined pressure level, the bypass valve 41 opens and closes repeatedly as the working fluid temperature rises and falls. In the region C in which the working fluid temperature rises to some extent while the line pressure exceeds the predetermined pressure level, the relief valve 42 opens due to the line pressure exceeding the predetermined pressure level. Thus, in region C, the working fluid is allowed to flow through the water-cooled oil cooler 31 and the relief valve 42 through the oil passages in the automatic transmission while bypassing only the air-cooled oil cooler 32. In the region D where the working fluid temperature exceeds a pre-adjusted temperature value, for example, when the engine is warmed up and approaching the operating temperature, the bypass valve 41 and the relief valve 42 increase the cooling action. To this end, the working fluid is closed to flow through the water-cooled oil cooler 31 and the air-cooled oil cooler 32. One such transmission fluid cooling system is disclosed in Japanese Laid-Open Patent Publication No. 2000-46156.
[18] As shown in Figures 4 and 5, the transmission fluid cooling system 30 has some drawbacks. First, in the low temperature working fluid temperature region A of Fig. 5, the bypass valve 41 opens completely regardless of the magnitude of the line pressure. In this case, there is no flow through the water cooled oil cooler 31. In other words, the working fluid cannot be heated rapidly by the engine coolant circulation. The viscosity of the working fluid provided to the movable transmission parts (eg clutch plate, transmission input shaft, planetary gear system and various bushings and bearings) to lubricate is high. This will increase fuel consumption.
[19] Second, on the assumption that the working fluid temperature is higher than the pre-adjusted temperature value, but not sufficiently high, the water-cooled oil cooler 31 and the air-cooled oil cooler ( Bypass valve 41 is closed to allow the working fluid to flow through 32. In this case, due to the relatively high viscosity resistance (in particular, the higher viscosity resistance of the working fluid flowing through the air cooled oil cooler 32) and the low line pressure, the proper working fluid is not supplied to the oil passages. This results in recooling of the working fluid.
[20] Third, in the transmission fluid cooling system 30 as shown in FIGS. 4 and 5, the bypass valve 41 is located outside of the control valve 35 of the control valve body 34. Thus, the bypass oil passage is lengthened and complicated. In this case, some of the oil passages are exposed to outside air. If the ambient temperature is low, the fluid flow resistance of the working fluid flowing through the oil passages tends to increase. Due to the increased fluid flow resistance, it is impossible to obtain the working fluid supply required for smooth lubrication.
[21] It is therefore an object of the present invention to provide a cooling system for a working fluid used in an automatic transmission of a motor vehicle which solves the above-mentioned drawbacks.
[22] Another object of the present invention is to be used in an automatic transmission of an automobile having a water-cooled oil cooler and an air-cooled oil cooler connected in series with each other, and when the working fluid temperature is low, each water-cooled oil according to the size of the line pressure as well as the working fluid temperature It is to provide a cooling system for the working fluid which ensures the optimum switching between the operating and non-operating modes of the cooler and the air-cooled oil cooler.
[23] Another object of the present invention is to be used in an automatic transmission of an automobile having a water-cooled oil cooler and an air-cooled oil cooler connected in series with each other, and when the working fluid temperature is low, the line pressure is low, and the working fluid temperature is medium, the water-cooled oil It is to provide a cooling system for the working fluid which allows the operating mode of the cooler and the non-operating mode of the air cooled oil cooler.
[24] Another object of the present invention is to be used in an automatic transmission of an automobile having a water-cooled oil cooler and an air-cooled oil cooler connected in series with each other, and to allow an operating mode of both the water-cooled oil cooler and the air-cooled oil cooler when the working fluid temperature is high. It is to provide a cooling system for the working fluid.
[25] Another object of the present invention is to be used in an automatic transmission of an automobile having a water-cooled oil cooler and an air-cooled oil cooler connected in series with each other and combined with both a water-cooled oil cooler and an air-cooled oil cooler while the entire length of the bypass circuit is minimized. It is to provide a simple cooling system for a working fluid in which a bypass circuit including a pass valve is not affected by ambient temperature and in addition the bypass circuit is densely configured.
[1] 1 is a system block diagram showing a first embodiment of a transmission fluid cooling system of an automobile having a water cooled oil cooler and an air cooled oil cooler.
[2] FIG. 2 is a schematic diagram of operating characteristics of the first and second bypass valves integrated into the cooling system of the embodiment shown in FIG. 1 according to line pressure and working fluid temperature. FIG.
[3] 3 is a system block diagram showing a second embodiment of a transmission fluid cooling system of a motor vehicle having a water cooled oil cooler and an air cooled oil cooler.
[4] 4 is a system block diagram illustrating an optional transmission fluid cooling system.
[5] FIG. 5 is a schematic diagram of operating characteristics of the bypass valve and relief valve integrated in the transmission fluid cooling system shown in FIG. 4 according to line pressure and working fluid temperature. FIG.
[6] <Explanation of symbols for the main parts of the drawings>
[7] 10: transmission fluid cooling system
[8] 11, 31: water-cooled oil cooler
[9] 12, 32: air-cooled oil cooler
[10] 16: lubrication circuit
[11] 18: oil pump
[12] 19: line pressure
[13] 21: first bypass valve
[14] 22: second bypass valve
[26] In order to achieve the above description and other objects of the present invention, the cooling system for the working fluid used in the automatic transmission of an automobile is connected in series with each other and the water-cooled oil cooler and the air-cooled oil cooler disposed in the oil cooler line to cool the working fluid. An oil pump positioned in the automatic transmission and disposed in the oil cooler line to pressurize and deliver the working fluid to the oil cooler line, and a hydraulic control circuit disposed downstream of the oil pump to control the line pressure generated by the oil pump; A lubrication circuit disposed in an automatic transmission for lubricating moving transmission parts, and only when the working fluid temperature is less than or equal to a predetermined temperature and the line pressure is greater than or equal to a predetermined pressure, the working fluid is water-cooled oil The oil pump, hydraulic control circuit and A first bypass valve that opens to circulate through the first bypass valve via a lubrication circuit and an oil pump that bypasses the air-cooled oil cooler only when the working fluid temperature is less than or equal to a preset temperature value And a second bypass valve that opens the working fluid through the hydraulic control circuit and the lubrication circuit to circulate via the water-cooled oil cooler and the second bypass valve.
[27] According to another aspect of the present invention, a cooling system for a working fluid used in an automotive transmission is connected to each other in series and positioned in an automatic transmission with a water-cooled oil cooler and an air-cooled oil cooler disposed in an oil cooler line to cool the working fluid. And an oil pump disposed in the oil cooler line to pressurize and deliver the working fluid to the oil cooler line, a hydraulic control circuit disposed downstream of the oil pump to regulate the line pressure generated by the oil pump, and lubrication of the movable transmission parts. The lubrication circuit disposed in the automatic transmission and the operating fluid to circulate through the first bypass valve via the oil pump, hydraulic control circuit and lubrication circuit while bypassing the water cooled oil cooler and air cooled oil cooler As well as opening depending on the temperature of the working fluid, And a first bypass valve located within the included control valve body.
[28] According to another aspect of the invention, a cooling system for a working fluid used in an automatic transmission of an automobile is connected to each other in series and with a water-cooled oil cooler and an air-cooled oil cooler arranged in an oil cooler line to cool the working fluid. An oil pump located in the oil cooler line to pressurize and deliver the working fluid to the oil cooler line, a hydraulic control circuit disposed downstream of the oil pump to control the line pressure generated by the oil pump, and a movable transmission Lubrication circuit disposed in the automatic transmission for lubrication of the parts, and the pressure set by the hydraulic pressure generated on the working fluid in the part of the oil cooler line from the outlet of the hydraulic control circuit to the upstream side of the water cooled oil cooler and the air cooled oil cooler The working fluid is only cooled when the level is exceeded A first bypass valve which bypasses the air-cooled oil cooler and circulates through the first bypass valve via the oil pump, hydraulic control circuit and lubrication circuit, and the working fluid only when the working fluid temperature is below a preset temperature value And a second bypass valve that bypasses only the air-cooled oil cooler and opens to circulate through the water-cooled oil cooler and the second bypass valve via the oil pump, hydraulic control circuit and lubrication circuit.
[29] According to another aspect of the invention, a cooling system for a working fluid used in an automatic transmission of an automobile is connected to each other in series and with a water-cooled oil cooler and an air-cooled oil cooler arranged in an oil cooler line to cool the working fluid. An oil pump located in the oil cooler line to pressurize and deliver the working fluid to the oil cooler line, a hydraulic control circuit disposed downstream of the oil pump to control the line pressure generated by the oil pump, and a movable transmission The lubrication circuit placed on the automatic transmission for the lubrication of parts, the temperature sensor for sensing the working fluid temperature, the working fluid bypasses the water-cooled oil cooler and the air-cooled oil cooler and the oil pump, the hydraulic control circuit and the lubrication circuit First bypass valve to allow circulation through the 1 bypass valve A second bypass valve allowing the working fluid to circulate through the water-cooled oil cooler and the second bypass valve via the oil pump, hydraulic control circuit and lubrication circuit while bypassing only the air-cooled oil cooler, and the temperature of the working fluid The electrical control of the temperature sensor, the first and second bypass valves is also performed to automatically control the opening and closing of the respective first and second bypass valves according to the line pressure and to control the line pressure according to the sensor signal from the temperature sensor. A first bypass valve control and a second high temperature of the working fluid, the first bypass valve being kept open in a first control mode region where the temperature of the working fluid is low and the line pressure is high. A control unit including a second bypass valve control unit for continuously maintaining the second bypass valve in a closed state in the control mode region. Include.
[30] Other objects and features of the present invention will become understood from the following description with reference to the accompanying drawings.
[31] 1, in particular with reference to FIG. 1, a block diagram of a transmission fluid cooling system 10 of the first embodiment is shown. The transmission fluid cooling system 10 includes a water-cooled oil cooler 11 and an air-cooled oil cooler 12 connected in series with each other. The water-cooled oil cooler 11 functions to remove heat from the working fluid (transmission fluid) by forced circulation of the engine coolant. The air-cooled oil cooler 12 functions to cool the working fluid by bringing it into close contact with a large amount of outside air (cooling air). The water-cooled oil cooler 11 and the air-cooled oil cooler 12 are fluidly connected to the control valve 15 and the lubrication circuit 16 in the automatic transmission via the hydraulic line or the oil cooler line 17. The control valve 15 is incorporated in the control valve body 14 included in the hydraulic control circuit installed in the automatic transmission 13. An oil pump 18 is provided to pressurize and deliver the working fluid into the hydraulic line through the outlet port for forced circulation of the working fluid. The working fluid discharged from the oil pump 18 circulates in the order of the control valve 15, the water-cooled oil cooler 11, the air-cooled oil cooler 12, and the lubrication circuit 16 (see FIG. 1). In the hydraulic line 19 (placed between the oil pump 18 and the control valve 15), the line pressure is generated by the oil pump 18 and the control valve 15 of the hydraulic control circuit to produce a regulated line pressure. Is controlled by The control valve 15 is driven in response to a command signal from the electronic control unit 23 (ECU) which will be described later fully. Thus, the line pressure is controlled in response to the command signal from the electronic control unit 23, so that the actual line pressure is close to the required value. In practice, the line pressure in the hydraulic line 19 is controlled or regulated according to the oil temperature detected by the oil temperature sensor 25 or the oil temperature sensor 22t (described later). The line indicated by reference numeral 20 is a hydraulic line 19 leading from the outlet port of the control valve 15 to the upstream side (water-cooled oil cooler) of the water-cooled oil cooler 11 and the air-cooled oil cooler 12; Part of the oil cooler line 17. The hydraulic pressure in the hydraulic line 20 is substantially proportional to and smaller than the line pressure. The transmission fluid cooling system 10 also includes a first bypass valve 21 and a second bypass valve 22. The first bypass valve 21 is disposed in the control valve body 14. The first bypass valve 21 operates in response to the hydraulic pressure in the hydraulic line 20. Note that the hydraulic pressure in the hydraulic line 20 is different from the line pressure (hydraulic pressure in the hydraulic line 19) itself. As will be described in detail later, the hydraulic pressure in the hydraulic line 20 varies not only with the line pressure but also with the temperature of the working fluid. The line pressure in the hydraulic line 19 is generally estimated from the signal value of the command signal from the electronic control unit 23. The signal value of the command signal from the electronic control unit 23 is based on the temperature value of the oil temperature detected by the oil temperature sensor 25 (or oil temperature sensor 22t). As shown in Fig. 1, the oil temperature sensor 25 is screwed or positioned in a hydraulic line disposed between the lubrication circuit 16 and the oil pump 18 for oil temperature measurement. The sensor signal from the oil temperature sensor 25 is transmitted to the input interface of the electronic control unit 23. In view of the viscosity of the working fluid correlated with the oil temperature detected by the oil temperature sensor 25, the line pressure is suitably controlled by the electronic control unit 23. Instead of estimating the line pressure from the command signal value of the electronic control unit 23, the line pressure can be detected or directly sensed by a pressure sensor (not shown) located in the hydraulic line 19.
[32] When the hydraulic pressure in the hydraulic line 20 exceeds a predetermined pressure level, the first bypass valve 21 operates the automatic transmission (when the working fluid bypasses the water-cooled oil cooler 11 and the air-cooled oil cooler 12). Fully open for circulation via the first bypass valve through the oil passages in 13). In the transmission fluid cooling system of the first embodiment of FIG. 1, the first bypass valve 21 (configured by the pressure relief valve) is densely located in the control valve body 14. Thus, the overall length of the oil cooler line 17 can be minimized or shortened, and the structure of the oil cooler line or the oil cooler hydraulic circuit is simple. In addition, the working fluid flowing through the first bypass valve 21 may not be directly exposed to the outside air. This reduces the fluid flow resistance of the working fluid flowing through the oil passages and improves the lubrication effect to ensure improved fuel savings.
[33] In contrast, the second bypass valve 22 is provided outside of the automatic transmission 13. The second bypass valve 22 allows the working fluid to circulate through the water cooled oil cooler 11 and the second bypass valve 22 through the oil passages in the automatic transmission while bypassing the air cooled oil cooler 12 only. Open. Specifically, only when the oil temperature exceeds a predetermined temperature value, the second bypass valve 22 is closed (as described later with reference to the characteristic diagram in FIG. 2). In the system of the first embodiment, the first bypass valve is constituted by a pressure relief valve whose set pressure has the predetermined pressure level for hydraulic pressure in the hydraulic line 20. On the other hand, the second bypass valve 22 consists of an oil temperature sensing bypass valve such as a wax pellet type bypass valve which is closed by an expandable wax pellet as the temperature of the working fluid increases. The wax pellets function as an oil temperature sensing element 22e (see Figure 1). The oil temperature sensing element 22e assembled to the second bypass valve 22 can sense the temperature of the working fluid flowing through the second bypass valve 22.
[34] 3, a block diagram of a transmission fluid cooling system 50 of the second embodiment is shown. In the second embodiment, the electronically controlled electromagnetic solenoid valves are used as the first and second bypass valves 21 and 22, so that the cooling system 50 of the second embodiment of FIG. 3 is the first embodiment of FIG. Slightly different from the example cooling system 10. As described in detail with reference to Fig. 2, the operations and effects of the system of the second embodiment of Fig. 3 and the system of the first embodiment of Fig. 1 are the same. To compare the first and second embodiments, the same reference numerals used for indicating the elements in the system of the first embodiment shown in FIG. 1 are assigned to the corresponding elements used in the system of the second embodiment shown in FIG. Will apply. The first and second bypass valves 21 and 22 constituted by electromagnetic solenoid valves and the oil temperature sensor 22t assembled to the second bypass valve are described in detail later with reference to the accompanying drawings, Since the description appears to be obvious, detailed descriptions of other elements will be omitted.
[35] In the cooling system 50 of the second embodiment, the first bypass valve 21 is composed of an electromagnetic solenoid valve actuated electromagnetically in response to a control signal (solenoid drive signal) from the electronic control unit 23. . The magnitude of the solenoid drive signal is estimated by the command signal from the output interface of the electronic control unit 23 and depends on the line pressure corresponding to the predetermined line pressure calculated based on the detected oil temperature. In the same manner as the system 10 of the first embodiment of FIG. 1, in the cooling system 50 of the second embodiment of FIG. 3, the first bypass valve 21 (which consists of an electromagnetic solenoid valve) is a control valve body. While densely located in 14, the second bypass valve 22 is provided outside of the automatic transmission 13. The second bypass valve 22 is composed of an electromagnetic solenoid valve which is electromagnetically operated in response to a control signal (solenoid drive signal) from the electronic control unit 23. The magnitude of the solenoid drive signal depends on the temperature of the working fluid detected by the oil temperature sensor 22t and the oil temperature sensor 25 assembled in the second bypass valve 22. The oil temperature sensor signal from the temperature sensor 22t and the sensor signal from the temperature sensor 25, which are assembled to the second bypass valve 22, are transmitted to the input interface of the electronic control unit 23. Note that there is an operating range in which no working fluid is provided to the second bypass valve 22. In the case where no working fluid is provided to the second bypass valve 22, it is impossible to accurately measure or detect the oil temperature by the oil temperature sensor 22t assembled to the second bypass valve 22. . While no working fluid is provided to the second bypass valve 22, the oil temperature sensor 25 described above functions as an auxiliary oil temperature sensor.
[36] Descriptions of the electronic control unit 23 will be described later with reference to FIGS. 1 and 3.
[37] The electronic control unit 23 (bypass valve controller) generally includes a microcomputer. The electronic control unit includes an input / output interface (I / O), memory (RAM, ROM) and a microprocessor or central processing unit (CPU). The input / output interface (I / O) of the electronic control unit 23 is connected to various engine / vehicle sensors (oil temperature sensor 25 or second bypass valve 22 in the first embodiment). Input information from the sensor 22t and the auxiliary oil temperature sensor 25 in the second embodiment. Within the electronic control unit 23, the central processing unit (CPU) allows access by the input / output interface of the input information data signals from the engine / vehicle sensors described above. In the cooling system 10 of the first embodiment of FIG. 1, the central processing unit (CPU) of the electronic control unit 23 serves to process the line pressure control program stored in the memories, and to the control valve 15. It is possible to perform the necessary computational and logic operations, including the control processing process. The result of the calculation, ie the calculated output signal, is relayed via the output interface circuit of the electronic control unit 23 to an electromagnetic spool valve constituting part of the output stage, for example the control valve 15. The control valve control process is performed in the central processing unit (CPU) of the electronic control unit 23 based on the oil temperature detected by the temperature sensor 25.
[38] Alternatively, in addition to the above-described line pressure control program based on the oil temperature, in the cooling system 50 of the second embodiment of FIG. 3, the central processing unit (CPU) of the electronic control unit 23 has a first stored in the memories. A transmission in charge of performing the bypass valve control / second bypass valve control program and including opening and closing control of the electronic first and second bypass valves executed through the transmission fluid cooling system of the second embodiment It is possible to perform the necessary computational and logic operations, including the fluid temperature control processing process. The calculation results (arithmetic calculation results), i.e. the calculated output signals (solenoid drive currents), are output via the output interface circuit of the electronic control unit 23, i.e., of the first bypass valve 21. Relayed to the electromagnetic solenoids constituting the part and part of the second bypass valve 22. Based on the sensor signal from the oil temperature sensor 22t and / or the oil temperature sensor 25, the transmission fluid temperature control processing process recalls the characteristic map of FIG. 2 and the central processing unit (CPU) of the electronic control unit 23. Is executed inside). In the system of the second embodiment of Fig. 3, the line pressure (exactly the line corresponding to the predetermined line pressure estimated by the command signal from the output interface of the electronic control unit 23 and calculated based on the detected oil temperature) Pressure) and the working fluid temperature, the first and second bypass valves 21, 22 are electronically controlled by the electronic control unit 23.
[39] Described next with reference to the operating characteristics of the first and second bypass valves 21 and 22 shown in FIG. 2 are the transmission fluid temperature control process executed by the system 50 of the second embodiment of FIG. Working fluid temperature and hydraulic pressure detected by the oil temperature sensing element assembled in the wax-pellet bypass valve by using a pressure relief valve as the first bypass valve and a wax-pellet bypass valve as the second bypass valve. A description is given of the transmission fluid temperature control of the system 10 of the first embodiment which is mechanically operated according to the hydraulic pressure in the line 20.
[40] As can be seen from the opening and closing characteristic diagrams of the first and second bypass valves 21 and 22 shown in Fig. 2, in the cooling system of each of the first and second embodiments, the valve control mode area has three controls. It is divided into mode areas A2, B2 and C2. In the first control mode region A2 (see right diagonal shaded region in FIG. 2) where the temperature of the working fluid is low while the line pressure is high, the flow resistance to the working fluid flow through the water-cooled oil cooler 11 is high. Tend to be. In this case, the hydraulic pressure in the hydraulic line 20 rises. Due to the pressure rise, more specifically, due to the hydraulic pressure in the hydraulic line 20 exceeding a predetermined pressure level, the first bypass valve 21 causes the working fluid to bypass the oil coolers 11, 12. While fully open to circulate via the lubrication circuit 16, the oil pump 18 and the control valve 15 via the first bypass valve 21. In other words, in the first control mode region A2, the water-cooled oil cooler 11 and the air-cooled oil cooler 12 are left inoperative by the open first bypass valve 21. This ensures a smooth circulation of the working fluid through the transmission lubrication circuit and the control valve, regardless of the relatively high viscosity resistance of the working fluid due to the temperature of the low working fluid. This ensures smooth shifting operation and good lubrication function in the area A2.
[41] Regarding the control mode region B2 (see the non-shading region in FIG. 2), firstly, the region B2 in which the line pressure (hydraulic pressure in the hydraulic line 19) is high and the temperature of the working fluid rises to some extent is increased. In the first portion (upper right), the second bypass valve 22 opens because the temperature of the working fluid is lower than the predetermined temperature value. As a result, the working fluid in the hydraulic line 20 is transferred to the automatic transmission through the water-cooled oil cooler 11, the second bypass valve 22 even in spite of the high line pressure (high hydraulic pressure in the line 19). 13) direction is taken into. Thus, the flow of the working fluid into the automatic transmission 13 through the second bypass valve 22 takes place constantly. As a result, the hydraulic pressure in the hydraulic line 20 is maintained at a pressure level lower than the predetermined pressure level at which the first bypass valve 21 opens. While the second bypass valve 22 is open, the first bypass valve 21 remains closed. In other words, in the first portion of the region B2 where the line pressure is high and the temperature of the working fluid rises to some extent, the water-cooled oil cooler 11 is placed in an operating state while the air-cooled oil cooler 12 is in an inoperative state. Will be. Thus, in the first part of the region B2, the working fluid only bypasses the air-cooled oil cooler 12, but the control valve 15, the water-cooled oil cooler 11 and the second bypass valve from the oil pump 18. It flows through the lubrication circuit 16 via 22. This ensures optimum working fluid temperature control. Secondly, in the second part of the region B2 where the temperature of the working fluid is low and the line pressure is high, the first bypass valve 21 remains closed due to the low line pressure. On the other hand, the second bypass valve 22 remains open due to the low working fluid temperature. In the same way as the first part of the region B2, in the second part of the region B2, the lubrication circuit 16 and the control valve are provided to the automatic transmission 13 while the working fluid bypasses only the air-cooled oil cooler. Circulates through 15 through a water-cooled oil cooler 11 and a second bypass valve 22. Due to the fluid flow of the working fluid flowing through only the water-cooled oil cooler 11 while bypassing the air-cooled oil cooler 12, the working fluid (transmission fluid) has a rate of increase in the temperature of the working fluid during engine operation. Preheated by higher engine coolant. This promotes a rise in the temperature of the working fluid. In the third part (last part or lower right) of the region B2 where the line pressure is low and the temperature rises to some extent, the temperature of the working fluid is smaller than the predetermined temperature value and due to the low line pressure, The second bypass valve 22 remains open while the first bypass valve 21 remains closed. Thus, in the same way as the first and second zones of zone B2, in the third zone of zone B2, the working fluid is provided to the automatic transmission 13 while bypassing only the air-cooled oil cooler 12. It circulates through the lubrication circuit 16 and the control valve 15 via the water-cooled oil cooler 11 and the air-cooled oil cooler 12. As described above, the water-cooled oil cooler 11 is in an operating state while the air-cooled oil cooler 12 is in an inactive state throughout the control mode region B2. In the second and third parts of the region B2 where the line pressure is low and the temperature of the working fluid is less than the predetermined temperature value, the working fluid bypasses the air-cooled oil cooler 12 and only the water-cooled oil cooler 11 Flowing through, the working fluid can be effectively preheated by the engine coolant. This reduces the viscosity of the working fluid, ensuring the proper transfer of the working fluid required for lubrication and leading to improved lubrication effects and fuel savings.
[42] In the control mode region C2 (see the left diagonal shaded region in FIG. 2) where the temperature of the working fluid is above the predetermined temperature value, the flow resistance to the working fluid flowing through the water-cooled oil cooler 11 tends to be small. have. In this case, the hydraulic pressure in the hydraulic line 20 is reduced. In this case, the hydraulic pressure in the hydraulic line 20 below the predetermined pressure level causes the first bypass valve 21 to remain closed. In addition, the second bypass valve 22 remains closed due to the temperature of the working fluid that is less than the predetermined temperature value. As a result, the working fluid flows through the water-cooled oil cooler 11 and the air-cooled oil cooler 12 so as to efficiently and properly cool the working fluid. As can be determined from the operating and non-operating state of the first bypass valve 21 in the respective control mode regions A2, B2 and C2 of FIG. 2, the hydraulic pressure in the hydraulic line 20 is the line pressure. It can be influenced by the temperature of the working fluid as well as the "hydraulic pressure in the hydraulic line 19". In other words, the opening and closing operation of the first bypass valve 21 depends not only on the line pressure but also on the temperature of the working fluid since the first bypass valve operates in response to the hydraulic pressure in the hydraulic line 20. The characteristic diagram of Fig. 2, i.e., the boundary between the control mode regions A2 and B2 and the boundary between the control mode regions B2 and C2, can be changed as appropriate depending on the environment in which the vehicle is actually used, for example whether the vehicle is used in cold climates. Or may be determined. The entire contents of Japanese Patent Application Publication No. P2001-067029 (filed March 9, 2001) are incorporated herein by reference. While the above text is a description of preferred embodiments carried out by the present invention, the invention is not limited to the specific embodiments shown and described herein but these various changes and modifications are defined by the following claims. Likewise, the invention can be carried out without departing from the scope or spirit of the invention.
[43] The present invention is effective in providing a transmission fluid cooling system having a water-cooled oil cooler and an air-cooled oil cooler that are connected in series to each other and capable of cooling a working fluid circulating through a transmission oil pump, a hydraulic control circuit, and a lubrication circuit in a transmission. have.

权利要求:
Claims (12)
[1" claim-type="Currently amended] In a cooling system for a working fluid used in an automatic transmission of a vehicle,
A water-cooled oil cooler and an air-cooled oil cooler which are connected in series to each other and arranged in the oil cooler line to cool the working fluid,
An oil pump located in the automatic transmission and disposed in the oil cooler line to pressurize and transport the working fluid to the oil cooler line;
A hydraulic control circuit disposed downstream of the oil pump to regulate the line pressure generated by the oil pump;
A lubrication circuit located in the automatic transmission for lubrication of moving transmission components,
Only when the temperature of the working fluid is below the predetermined temperature and the line pressure is above the predetermined pressure, the working fluid passes through the oil pump, the hydraulic control circuit and the lubrication circuit while bypassing the water-cooled oil cooler and the air-cooled oil cooler. A first bypass valve opening to be circulated through the first bypass valve,
Only when the temperature of the working fluid is lower than or equal to a predetermined temperature value, the working fluid bypasses only the air-cooled oil cooler via the oil pump, the hydraulic control circuit and the lubrication circuit via the water-cooled oil cooler and the second bypass valve. And a second bypass valve open to be circulated.
[2" claim-type="Currently amended] 2. The cooling system of claim 1, wherein the first bypass valve is located in a control valve body included in the hydraulic control circuit.
[3" claim-type="Currently amended] In a cooling system for a working fluid used in an automatic transmission of a vehicle,
A water-cooled oil cooler and an air-cooled oil cooler which are connected in series to each other and arranged in the oil cooler line to cool the working fluid,
An oil pump located in the automatic transmission and disposed in the oil cooler line to pressurize and transport the working fluid to the oil cooler line;
A hydraulic control circuit disposed downstream of the oil pump to regulate the line pressure generated by the oil pump;
A lubrication circuit located in the automatic transmission for lubrication of moving transmission components,
Line pressure as well as line pressure to allow a working fluid to circulate via the first bypass valve through the oil pump, the hydraulic control circuit and the lubrication circuit while bypassing the water cooled oil cooler and the air cooled oil cooler. And a first bypass valve opened in response to the temperature and located in a control valve body included in the hydraulic control circuit.
[4" claim-type="Currently amended] 4. The cooling system of claim 3, wherein the first bypass valve opens only when the temperature of the working fluid is below a predetermined temperature and the line pressure is above a predetermined pressure.
[5" claim-type="Currently amended] In a cooling system for a working fluid used in an automatic transmission of a vehicle,
A water-cooled oil cooler and an air-cooled oil cooler in series with each other and positioned in the oil cooler line to cool the working fluid,
An oil pump located in the automatic transmission and disposed in the oil cooler line to pressurize and transport the working fluid to the oil cooler line;
A hydraulic control circuit disposed downstream of the oil pump to regulate the line pressure generated by the oil pump;
A lubrication circuit located in the automatic transmission for lubrication of moving transmission components,
Only when the hydraulic pressure generated on the working fluid in the portion of the oil cooler line extending from the outlet of the hydraulic control circuit to the upstream side of the water cooled oil cooler and the air cooled oil cooler exceeds a predetermined pressure level, the working fluid reaches the water cooled oil. A first bypass valve which opens to be circulated via a first bypass valve via the oil pump, the hydraulic control circuit and the lubrication circuit while bypassing a cooler and the air-cooled oil cooler;
Only when the temperature of the working fluid is below the predetermined temperature value, the working fluid circulates through the oil-cooled oil cooler and the second bypass valve through the oil pump, the hydraulic control circuit and the lubrication circuit while bypassing only the water-cooled oil cooler. And a second bypass valve that can be opened.
[6" claim-type="Currently amended] 6. The hydraulic pressure generated in a working fluid at a portion of an oil cooler line leading from the outlet of the hydraulic control circuit to the water cooled oil cooler and the air cooled oil cooler is variable depending on the line pressure as well as the temperature of the working fluid. Cooling system, characterized in that.
[7" claim-type="Currently amended] 7. The water-cooled oil cooler and the coolant as claimed in claim 6, wherein only when the temperature of the working fluid is equal to or less than a predetermined temperature smaller than a predetermined temperature value and the line pressure is equal to or greater than a predetermined pressure larger than a predetermined pressure level. And wherein the hydraulic pressure generated on the working fluid in the portion of the oil cooler line leading to the air cooled oil cooler exceeds a predetermined pressure level.
[8" claim-type="Currently amended] 6. The cooling system of claim 5, wherein the first bypass valve is located in a control circuit body included in the hydraulic control circuit.
[9" claim-type="Currently amended] 6. The method of claim 5, wherein the first bypass valve comprises a pressure relief valve having a set pressure at a predetermined pressure level, wherein the second bypass valve is closed by expandable wax pellets due to increasing temperature of the working fluid. Cooling system comprising a wax-pellet bypass valve.
[10" claim-type="Currently amended] In a cooling system for a working fluid used in an automatic transmission of a vehicle,
A water-cooled oil cooler and an air-cooled oil cooler which are connected in series to each other and arranged in the oil cooler line to cool the working fluid,
An oil pump positioned in the automatic transmission and disposed in the oil cooler line to pressurize and transport the working fluid to the oil cooler line;
A hydraulic control circuit disposed downstream of the oil pump to regulate the line pressure generated by the oil pump;
A lubrication circuit disposed in the automatic transmission for lubrication of the transmission components,
A temperature sensor for detecting the temperature of the working fluid,
A first bypass valve allowing a working fluid to circulate through the oil pump, the hydraulic control circuit and the lubrication circuit via a first bypass valve while bypassing the water-cooled oil cooler and the air-cooled oil cooler;
A second bypass valve allowing a working fluid to circulate through the water-cooled oil cooler and the second bypass valve through the oil pump, the hydraulic control circuit and the lubrication circuit while bypassing only the air-cooled oil cooler;
The temperature sensor, the first and the first and second automatic control of opening and closing operations of the respective first and second bypass valves in accordance with the line pressure as well as the temperature of the working fluid and the line pressure in accordance with a sensor signal from the temperature sensor. A control unit configured to electrically connect the second bypass valve,
The control unit includes a first bypass valve controller for keeping the first bypass valve open in a first control mode region having a low temperature of the working fluid and a high line pressure, and a second control mode having a high temperature of the working fluid. And a second bypass valve control for keeping the second bypass valve closed in the region.
[11" claim-type="Currently amended] The method of claim 10, wherein the first and second bypass valve controllers maintain the first bypass valve in an open state in a third control mode region defined between the first and second control mode regions. 2 Cooling system, characterized by keeping the bypass valve closed.
[12" claim-type="Currently amended] 12. The cooling system of claim 11, wherein the first bypass valve is located in a control valve body included in the hydraulic control circuit.

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同族专利:

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公开号 | 公开日

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JP3942836B2|2007-07-11|

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JP2002266993A|2002-09-18|

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KR100496107B1|2005-06-20|

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US20020128107A1|2002-09-12|

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US6740000B2|2004-05-25|

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US20040204281A1|2004-10-14|

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US6830527B2|2004-12-14|

引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2001-03-09|Priority to JP2001067029A

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2001-03-09|Priority to JPJP-P-2001-00067029

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2002-03-08|Application filed by 쟈트코 가부시키가이샤

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2002-09-14|Publication of KR20020072223A

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2005-06-20|Application granted

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2005-06-20|Publication of KR100496107B1

优先权:

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申请号 | 申请日 | 专利标题

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JP2001067029A|JP3942836B2|2001-03-09|2001-03-09|Hydraulic oil cooling device for automatic transmission for vehicle|

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JPJP-P-2001-00067029|2001-03-09|