• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The parasitic hydraulic load on an internal combustion engine is substantially reduced during cold starts by using a relief valve to control the flow of hydraulic fluid from a hydraulic pump to a hydraulic actuator, i. a load source, wherein the hydraulic fluid between the hydraulic pump and the relief valve is recirculated.
    公开号:AT511148A2
    申请号:T185/2012
    申请日:2012-02-14
    公开日:2012-09-15
    发明作者:
    申请人:Deere & Co；
    IPC主号:
    专利说明:

    • * • ί
    Field of the invention
    This invention relates to hydraulic relief valves, and more particularly to hydraulic relief valves which are designed to relieve pressure from a hydraulic pump and thereby from an engine under certain conditions, e.g. Cold starts, are suitable.
    Background of the invention
    On-highway devices, such as diesel powered vehicles, can sometimes encounter difficulties in performing cold starts at cold temperatures, such as at low temperatures. Temperatures of less than 0 ° C, have. This may be due, inter alia, to a combination of: (1) greater difficulty in starting a relief engine at cold temperatures; and (2) the cohesive application of parasitic load (e.g., hydraulic load) to the engine at start-up. As the internal combustion engines are increasingly tuned to the work requirements of the vehicle, i. Built and tuned to maximize work efficiency and energy efficiency, difficult starting conditions can become a more critical task for all. * 2 • «* * 2 •« * • * • ·
    Summary of the invention
    Here, an invention is described which improves the conditions under which cold starts are performed by substantially reducing the parasitic load on the internal combustion engine. This parasitic load is reduced by reducing the hydraulic loads on the engine via relief valves.
    Brief description of the drawings
    Fig. 1 is an illustrative example of a work vehicle on which the invention can be used for cold starts;
    FIG. 2 is a perspective view of an exemplary hydraulic pump with integrated relief valve; FIG.
    Fig. 3 is an explanatory view of a hydraulic circuit using the invention; and
    Fig. 4 illustrates an exemplary functional scheme for the invention.
    Description of the preferred embodiment
    FIG. 1 illustrates a work vehicle 10 having a cab 18 and ground engaging means 20 that may have incorporated the invention to enhance cold starts. In such vehicles, many parasitic hydraulic loads, e.g. Pumps for hydraulic fans, hydrostatic charging pumps, etc., be provided. Parasitic hydraulic loads can be substantially reduced by the use of relief valves to relieve hydraulic loads in areas where the functionality that requires such hydraulic loads may not be essential at the time. Figure 2 illustrates an exemplary integrated hydraulic fan pump 100 having a pump section 110 and a relief valve section 120. Although unloading can be done in a non-integrated manner, such integration can save valuable space by its compactness, increase reliability by reducing the number of exposed and connected parts and the efficiency will be increased by the running distance of Hydraulikö! is reduced,
    3 is an illustration of a system showing an exemplary embodiment of the integrated hydraulic pump 100 operatively connected to an engine 160, which in this embodiment may be via a conventional mechanical connection to a transmission 125; and operatively connected to a vehicle control unit (VCU) 140 connected to a temperature sensor 140a disposed in a hydraulic fluid reservoir 150 to detect the temperature of the hydraulic fluid 151 and a vehicle control unit (VCU)
    Engine speed sensor 140b, which may be located in internal combustion engine 160 in this embodiment, may be in electrical communication. As illustrated, the integrated hydraulic fan pump 100 may include a pump section 110 having an inlet 110a and an outlet 110b and a relief valve section 120. The relief valve portion 120 may have a closed position 120a, an open position 120b, an actuator, which in this case is a coil 120c, and a biasing device, which in this embodiment is a spring 120d. As illustrated, the relief valve portion 120 may be biased to the closed position 120a via the spring 120d or other device; it may move to the open position 120b after being powered by an electrical signal from the VCU 140 to its coil 120c or by some other method. As illustrated, a hydraulic fan 130 having a hydraulic fan motor 131 and fan blades 132 may be energized by pressurized hydraulic fluid 151 from the outlet 110b. The VCU 140 may continuously monitor the input from the temperature sensor 140a and the engine speed sensor 140b. Also included in this embodiment is a conventional ignition (not shown) with inputs and outputs, and a conventional starter for the internal combustion engine. In this embodiment, the engine 160 is started by conventional means.
    As shown, when the relief valve portion 120 is in the closed position 120a by default, the hydraulic fluid 151 pressurized by the pump portion 110 can flow directly to the hydraulic fan motor 131, the system, i.e., the hydraulic fluid motor 131. the integrated hydraulic pump 100 for conventional vehicle operating conditions, i. larger hydraulic loads, is biased when the relief valve portion 120 is not energized.
    When the ignition is on, the engine 160 is off, i. when the engine speed detected by the speed sensor 140b is less than a predetermined speed value (300 RPM in this embodiment), and the temperature of the hydraulic fluid detected by the temperature sensor 140a is lower than a predetermined temperature value of e.g. 0 ° C as in this embodiment, the VCU 140 signals the relief valve portion 120 to move to the open position 120b, thereby allowing the hydraulic fluid 151 to flow through the relief valve portion 120. This arrangement may leave the inlet 110a and the outlet 110b open to the pump section, but allow a substantial amount of hydraulic oil moved by the pump section 110 to circulate between the pump section 110 and the relief valve section 120, thereby significantly reducing the hydraulic load from the fan motor 131 is reduced as fluids tend to go the path of least resistance, which in this case may be the path between the pump section 110 and the relief valve section 120.
    When the engine 160 has reached a speed greater than 850 RPM, as detected by the engine speed sensor 140b, or the hydraulic fluid 151 has a temperature greater than or equal to 0 ° C, as detected by the temperature sensor 140a, stops VCU 140 applies the power signal to the relief valve portion 120, allowing the relief valve portion 120 to move to the closed position 120. Once the relief valve portion 120 is in the closed position 120b, the hydraulic fluid may recycle between the pump portion 110 and the relief valve portion 120 , and follow the new path least resistance, ie to move from the pump section 110 to the hydraulic fan motor 131. The relief valve portion 120 may remain in the closed position until the following three conditions are met: (1) the ignition is on; (2) the engine speed is less than 300 RPM; and (3) the detected temperature of the hydraulic fluid 151 is lower than 0 ° C.
    The above actions are detected in the logic of the program / routine 200 followed by the VCU 140, as illustrated in the functional diagram of FIG. As shown in FIG. 4, when the ignition is on at 210 and the engine is off, i. the engine speed is less than 300 RPM at 220 and the temperature of the hydraulic fluid 151 is less than 0 ° C at 230, the relief valve portion 120 is energized to open at 240. As illustrated, the relief valve 120 is energized to remain open until the engine 160 reaches an engine speed greater than the predetermined speed of 850 RPM. Once the engine speed is greater than 850 RPM, the relief valve portion 120 is de-energized and allowed to close at 260, i. the VCU 140 ceases to energize the relief valve portion 120. At 220, if the engine speed is greater than or equal to 300 RPM, or at 230, the temperature of the hydraulic fluid 151 is greater than or equal to 0 ° C, the relief valve 120 is set open.
    Having described the preferred embodiment, it will be understood that various modifications can be made without departing from the scope of the invention as defined in the appended claims. The invention has been described as an integrating arrangement of hydraulic pump and valve, but would also work if the pump section 110 and the relief valve section 120 were not installed, i. physically separate but in fluid communication with each other.
    权利要求:
    Claims (17)
    [1]
    Claims 1. A work vehicle having a driver's cab and ground engaging means, comprising: an ignition; an internal combustion engine; a hydraulic motor; an integrated hydraulic pump having a pump portion and a valve portion, the valve portion having a first position for conveying pressurized fluid from the pump to the hydraulic motor, a second position allowing the hydraulic fluid to recirculate between the pump portion and the valve portion, and an actuator for moving the valve portion to the second position, and wherein the pump portion is operatively connected to the engine; an engine speed sensor for detecting an engine speed; a temperature sensor for detecting a temperature of the hydraulic fluid; and a vehicle control unit in communication with the engine speed sensor, the temperature sensor and the actuator, wherein the vehicle control unit energizes the actuator and moves the valve portion from the first position to the second position when (1) the ignition is on, (2) the engine speed is lower is as a first predetermined engine speed and (3) the temperature detected for the hydraulic fluid is below a predetermined temperature value, the vehicle control unit ceases to energize the actuator of the valve portion and allows the valve portion to return to the first position when the detected engine speed exceeds a second predetermined engine speed value which is higher than the first predetermined engine speed.
    [2]
    2. Work vehicle according to claim 1, characterized in that the first position is a closed position.
    [3]
    3. work vehicle according to claim 1, characterized in that the second position is an open position,
    [4]
    4. Work vehicle according to claim 1, characterized in that the actuating device is a solenoid.
    [5]
    5. Work vehicle according to claim 1, characterized in that it contains a spring which biases the valve portion in the first position,
    [6]
    A work vehicle according to claim 1, characterized in that the first predetermined engine speed is 300 RPM.
    [7]
    7. Work vehicle according to claim 1, characterized in that the second predetermined engine speed is 850 rpm.
    [8]
    8. Work vehicle according to claim 1, characterized in that the predetermined temperature value is 0 ° C.
    [9]
    9. A work machine comprising: an ignition: an internal combustion engine; a hydraulic motor; An integrated hydraulic pump having a pump portion and a valve portion, the valve portion having a first position for conveying pressurized fluid from the pump to the hydraulic motor, a second position allowing the hydraulic fluid to recirculate between the pump portion and the valve portion and an actuator for moving the valve portion to the second position, and wherein the pump portion is operatively connected to the engine; an engine speed sensor for detecting the engine speed; a temperature sensor for detecting a temperature of the hydraulic fluid; and a vehicle control unit in communication with the engine speed sensor, the temperature sensor and the actuator, wherein the vehicle control unit energizes the actuator to move the valve portion from the first position to the second position when (1) the ignition is on, the engine is off and (2) the sensed temperature is below a predetermined temperature value, the valve portion returning to the first position when the sensed engine speed is above a predetermined engine speed value.
    [10]
    10. Work machine according to claim 9, characterized in that the first position is a closed position.
    [11]
    11. Work machine according to claim 9, characterized in that the second position is an open position.
    [12]
    12. Work machine according to claim 9, characterized in that the actuating device is a solenoid.
    [13]
    13. A working machine according to claim 9, characterized in that it contains a spring which biases the valve portion in the first position.
    [14]
    14. A method for reducing parasitic loads during startup of a work vehicle having an internal combustion engine, an engine speed sensor, a temperature sensor, a hydraulic motor, a hydraulic pump, a hydraulic valve in the vicinity of the hydraulic pump and having an open position and a closed position, and a vehicle control unit, the method following steps include: a. Using the engine speed sensor to determine if the engine speed is below a first predetermined speed value; b. Using the temperature sensor to determine if the temperature of the hydraulic fluid is below a predetermined temperature value; and c. Using the hydraulic valve to cause the hydraulic fluid moved by the hydraulic pump to be diverted from the hydraulic motor and recirculated between the hydraulic pump and the hydraulic valve when the engine speed is below the predetermined speed value in step a and the temperature below the predetermined temperature value of step b lies.
    [15]
    15. The method of claim 14, further comprising using the hydraulic valve to terminate the recirculation of the hydraulic fluid between the hydraulic pump and the hydraulic valve to cause the hydraulic fluid pressurized by the hydraulic pump to be supplied to the hydraulic motor. when the engine speed is above a second predetermined speed that is greater than the first predetermined speed.
    [16]
    16. The method according to claim 14, characterized in that the first predetermined engine speed is 300 rpm. * * • ΐο
    [17]
    17. The method according to claim 15, characterized in that the second predetermined engine speed is 850 rpm.

    > 7 09
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    同族专利:
    公开号 | 公开日
    US8899031B2|2014-12-02|
    AT511148A3|2015-03-15|
    US20120204548A1|2012-08-16|
    CA2766860C|2018-06-12|
    CA2766860A1|2012-08-16|
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    法律状态:
    2018-05-15| REJ| Rejection|Effective date: 20180515 |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/028,845|US8899031B2|2011-02-16|2011-02-16|Cold start valve|
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