• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    Title: Pump and operating method for determining the top dead center / bottom dead center of the pump Pump comprising a diaphragm pump module (10) having at least one sensor (41, 44, 45, 46, 47) for detecting that the top dead center (OT) and / or the bottom dead center (UT) of the diaphragm pump module (10) are reached. Figure 1
    公开号:FR3084703A1
    申请号:FR1908702
    申请日:2019-07-30
    公开日:2020-02-07
    发明作者:Arno Matzner；Kathrin Schaefer；Marc Kovacic；Sebastian Gepperth；Siegfreid Zerbin
    申请人:Robert Bosch GmbH；
    IPC主号:
    专利说明:

    Description
    Title of the invention: Pump and operating method for determining the top dead center / bottom dead center of the pump Field of the invention [0001] The present invention relates to a diaphragm pump and to a method for determining the point top dead center and / or bottom dead center of the diaphragm pump.
    The invention also relates to a pump management method and to a computer program for the execution of the steps of the method as well as to a memory medium readable by a machine and comprising a program of computer for program execution. Finally, the invention relates to an electronic control device for carrying out the process.
    STATE OF THE ART In order to meet the increasingly stringent regulations relating to the composition of exhaust gases, it is necessary to reduce the nitrogen oxides contained in the exhaust gases emitted by internal combustion engines, including diesel engines. Thus, it is known to install an SCR catalyst (catalyst for selective catalytic reduction) in the exhaust gas line to reduce the nitrogen oxides contained in the exhaust gases of the internal combustion engine in the presence of a reducing agent. This significantly reduces the content of nitrogen oxides in the exhaust gas. The reaction requires ammonia to be mixed with the exhaust gases. In general, an aqueous urea solution is used (aqueous urea solution = HWL) which is injected into the exhaust gas line upstream of the SCR catalyst and which acts as a reagent for the ammonia components. A 32.5% aqueous urea solution is known commercially under the trademark AdBlue®.
    As the freezing point of the AdBlue® solution is at -11.5 ° C, it is necessary, in winter conditions, to pump the HWL solution after switching off the internal combustion engine, from the dosing module to return this solution to the reducing agent reservoir; this prevents damage to the dosing module if the HWL solution freezes. If a diaphragm pump is used as the HWL liquid delivery pump, the pumping operation can only be done in the reverse delivery direction (reminder). One solution to this problem is to provide a separate delivery pump. Alternatively, it is also possible to provide valve systems making it possible to reverse, as desired, the direction of transfer or return of the HWL solution. However, such valve systems may have leaks, resulting in a loss of pressure, and the HWL solution may become corrosive.
    Description and advantages of the invention The present invention relates to a pump comprising a diaphragm pump module having at least one sensor for detecting that the top dead center and / or dead center has been reached bottom of the diaphragm pump module.
    The invention is based on the possibility of passing the flow in two different directions through a unidirectional diaphragm pump, namely a supply direction and a return direction if during operation of the pump can be determined precisely its top dead center. To do this, the pump includes a diaphragm pump module with at least one sensor. The sensor detects reaching top dead center and / or bottom dead center of the diaphragm pump module.
    A method is also provided for determining the top and / or bottom dead center of the diaphragm pump module; this consists of detecting the top dead center using the sensor. The diaphragm pump is a translational piston diaphragm pump or a rotary diaphragm pump. In the case of a reciprocating diaphragm pump, the top dead center of the diaphragm pump module corresponds to the top dead center of its piston and the bottom dead center of the diaphragm pump module corresponds to the bottom dead center of its piston . According to the different embodiments of the pump and of the method, the sensor will have different designs.
    According to one embodiment of the pump, the sensor is a microphone for detecting the stop noise of the membrane of the membrane pump module. The diaphragm pump module has a stopper arranged to be encountered by the diaphragm when the diaphragm pump module reaches its top dead center. For the use of a pump according to this embodiment, the method provides for finding the top dead center when the microphone detects the stop noise.
    According to another development of the pump, the sensor is a camera or a photodetector. The detector is a photodetector, and a light source is provided. The camera or photodetector is designed to detect a position of the diaphragm of the diaphragm pump module. The use of a pump according to this embodiment in the top dead center detection method is detected when the camera or the photodetector detects that the membrane has arrived in its high position. The expression "low position" represents the position in which the membrane undergoes its maximum deformation.
    The sensor according to another development of the pump, is a Hall effect sensor. The sensor is designed to measure the distance from the diaphragm of the diaphragm pump module. Using the pump according to this exemplary embodiment, the method detects the top dead center when it is detected that the distance between the Hall effect sensor and the membrane reaches its minimum value.
    According to another development of the pump, the sensor is also a Hall effect sensor. However, it is designed to measure any non-uniformity in the membrane of the membrane pump module. For this, we mainly use a standard Hall effect sensor for a motor control of the diaphragm pump module. However, normally, this sensor does not detect a homogeneity defect in the magnetic field. A homogeneity defect can be generated artificially by a homogeneity defect in the magnet of the diaphragm pump module. This module is preferably oriented towards the top dead center and the bottom dead center of the diaphragm pump module. The use of a pump according to this embodiment is recognized by the upper, upper and lower dead center, when the Hall effect sensor detects the presence of inhomogeneity.
    According to another embodiment of the pump, the sensor is a TRM sensor (magnetoresistance sensor with tunnel effect). In addition, in this embodiment, the pump has an additional magnet in the pump diaphragm module. In particular, equipping the motor shaft, it is thus aligned with the top or bottom dead center of the diaphragm pump module. The TRM sensor is designed to detect the angle of rotation of the magnet. When using a pump according to this embodiment, the method determines the top dead center and / or the bottom dead center from the angle of rotation provided by the sensor.
    The sensor can be present without different embodiments of the invention, in the enclosure of the pump or in the working range of the magnetic armature of the pump.
    If we know the top dead center or bottom dead center, this allows, for example, to realize the pump with an inlet and an outlet; the inlet has an inlet valve and the outlet has an outlet valve. Each valve has a shutter member to close the inlet or outlet in the closed position. In addition, each valve has a return element, in particular in the form of a spring for pushing the closure element by the return force into its closed position. Finally, each valve has an actuator to release the closure element from its closed position. When an actuator is required, it exceeds the return force and opens the inlet valve or the outlet valve. At the end of actuation of the actuator, the restoring force pushes the respective closure element in its closed position, in return, and the inlet valve or the outlet valve closes.
    This pump can operate in delivery mode and also in reverse delivery mode. In discharge mode, the valve element is open and the outlet valve is closed when the diaphragm pump module moves from its bottom dead center to its top dead center; the inlet valve is closed and the outlet valve is open when the diaphragm pump module moves from its top dead center to its bottom dead center.
    In contrast, in reverse discharge mode, the inlet valve is closed and the outlet valve is open when the diaphragm pump module moves from its top dead center to its bottom point; the inlet valve is open and the outlet valve is closed when the diaphragm pump module moves from its top dead center to its bottom dead center. This allows for a transfer mode and a return mode with a single pump; only the inlet and outlet of the pump are fitted with valves to minimize leaks.
    The invention also relates to a computer program for executing each step of the method for determining the neutral point and / or the bottom dead center and / or the pump management method when these elements are executed by a electronic control device from a computer. This makes it possible to implement different embodiments of the process in an electronic control device without having to make constructive modifications. The machine-readable storage medium includes the recording of the program.
    Reading the computer program on an electronic control device makes it possible to have an electronic control device designed to determine the top dead center and / or the bottom dead center of a membrane pump module and / or estimate his situation.
    Presentation of the drawings The present invention will be described below, in detail using the embodiments shown in the accompanying drawings in which:
    [Fig.l] sectional view of the casing of a pump according to an exemplary embodiment of the invention, [fig-2] schematic representation of a pump according to another exemplary embodiment of the invention, [fig.3] schematic representation of the pump of FIG. 2 in a first operating state, [0024] [fig.4] schematic representation of the pump according to FIG. 2 in a second state of operation, [fig.5] schematic representation of the pump of FIG. 2 in a third operating state, [0026] [fig.6] schematic representation of the pump of FIG. 2 in a fourth operating state, [Fig.7] diagram of the chronological evolution of the displacement of an alternating piston of a pump according to an exemplary embodiment of the invention with the control of its inlet valve and its outlet valve, [Fig.8] schematic sectional view of the diaphragm pump module of a pump eg according to one embodiment of the invention, [fig.9] schematic section of a diaphragm pump module forming part of a pump according to another embodiment of the invention, [0030] [ fig.10] schematic sectional view of a diaphragm pump module for a pump according to an exemplary embodiment of the invention, [fig.l 1] schematic sectional view of a diaphragm pump module of a pump according to another exemplary embodiment of the invention, [fig. 12] schematic sectional view of a diaphragm pump module of a pump according to another embodiment of the invention.
    Description of the embodiment of the invention In the embodiments described below, the pumps have, as shown in Figure 1, a diaphragm pump module 10 having an inlet 20 and an outlet 30. The diaphragm pump module is a linear piston diaphragm pump module (or reciprocating piston) for the diaphragm pump. The inlet 20 is equipped with an inlet valve 21. The latter comprises a closure element 22 returned by a return element 23 in the form of a spring in the inlet 20 to close the latter. An electrically actuated actuator 24 recalls the closing or closing element 22 against the return force of the spring so that the inlet 20 opens. When the power supply to the actuator 24 stops, the return element 23 pushes the closing element 22 back into the inlet 20 to close the latter. Likewise, the outlet 30 has an outlet valve 31. This has a shutter element 32 which is pressed by a return element 33 in the form of a spring in the outlet 30. An electronically controlled actuator 34 opens the outlet valve 31 by recalling the shutter element 32. When the supply of the actuator 34 stops, the outlet valve 31 closes.
    Figure 2 shows the components described above in schematic form. The two valves 21, 31 are closed. Figures 3-6 show how the flow of a liquid such as, for example, an aqueous urea solution is controlled by the pump in that each time one of the valves 21, 31 is opened and the other is closed . As shown in Figure 7, these opening and closing movements must be synchronized with the movement of the reciprocating piston of the diaphragm pump module
    10. The travel ω varies in a sinusoidal form between a low dead center UT and a high dead center OT. The figure also shows the curve of the control A as a function of time t for the valves 21,31; A = 0 corresponds to the actuator 24, 34 cut; A = 1 corresponds to actuator 24, 34 activated. This control A is indicated by the order reference A21 for the inlet valve 21 and by A31 for the outlet valve 31. The inlet valve 21 is open for the duration t21 +; during the period t21- it is closed. The outlet valve 31 is open in the interval t31 + and it is closed in the interval t31-. This opening operation is preceded by a suction delay time ts. Then, the inlet valve 21 opens, which gives the state shown in Figure 3. The piston moves from its bottom dead center UT to its top dead center OT and the diaphragm pump module 10 sucks the liquid.
    The supply of the actuator 24 of the inlet valve 21 ends at top dead center OT. After a pressure delay time tp, starting from the bottom dead center UT, the outlet valve 31 opens while the inlet valve 21 closes. Up to the bottom dead center UT there reigns the state represented in FIG. 4 so that the liquid can exit from the diaphragm pump module 10 via the outlet 30.
    If the command A21 of the inlet valve 21 is changed by the command A31 of the outlet valve 31 according to FIG. 5, the pump operates in reverse delivery mode. In this state according to Figure 5, the liquid passes through the outlet valve 31 open and the inlet valve 21 being closed, to arrive in the diaphragm pump module 10; the liquid in the state shown in FIG. 6, the outlet valve 31 being closed and the inlet valve 21 being open, the liquid passes through the inlet 20.
    The determination of the top dead center OT necessary to switch to delivery mode and reverse delivery mode is carried out in different examples of pumps by the use of different types of sensors.
    In a first embodiment according to Figure 8, the diaphragm pump module 10 includes a working chamber and diaphragm 11 into which open the inlet 20 and the outlet 30. This chamber delimited by the membrane 12 is connected to the piston 13 and is driven therewith. The piston 13 has a magnetic armature 14 which is moved by the magnetic field generated by the annular coil 15 in the magnet 16. In the rest position, the armature 14 is prestressed with the piston 13 by the tension exerted by a helical spring. 17. This first embodiment provides a microphone 41 installed in the working chamber 11. There is also provided a stop 42 positioned so that the membrane 12 meets this stop when the piston 13 comes to its top dead center OT. This noise is detected by the microphone 41, which makes it possible to detect the arrival at the top dead center OT.
    According to a second embodiment shown in Figure 9, the membrane working chamber 11 includes a sensor 43 in the form of a photodetector. There is also a light source 44 which illuminates the membrane 12. The light from the light source 44 reflected by the membrane 12 is recognized by the photodetector when the piston 13 reaches its top dead center OT.
    In the third embodiment, the working chamber of the membrane 11 has a Hall effect sensor 45. This sensor continuously measures its distance from the membrane 12. When this distance reaches the minimum, this means that we are at top dead center.
    According to a fourth embodiment of the pump, the membrane pump module 10 also has a Hall effect sensor. This Hall effect sensor 46 is however not located in the working chamber 11 of the membrane. Furthermore, it is positioned to recognize a defect in the homogeneity of the magnetic field of the diaphragm pump module 10. The movable magnet 16 is produced so as to generate inhomogeneity when the piston 13 reaches its top dead center OT. This makes it possible to detect the top dead center from the signal from the Hall effect sensor 46.
    According to a fifth embodiment of the pump, the latter comprises a TMR sensor 47. There is also a magnet 48 whose position changes by the movement of the piston 13. There is an angle of rotation which is can detect with the TMR 47 sensor. This arrangement is designed so that the TMR sensor can conclude that one is in top dead center OT from this angle of rotation.
    NOMENCLATURE OF MAIN ELEMENTS [1045] 10 Diaphragm pump module [0046] 12 Diaphragm [0047] 20 Inlet [0048] 21 Inlet valve [0049] 22 Closing element [0050] 23 Return element [ 0051] 24 Actuator [0052] 30 Outlet [0053] 31 Outlet valve [0054] 32 Closing element [0055] 33 Return element [0056] 35 Actuator [0057] 41 Sensor [0058] 44 Sensor [0059] 45 Sensor [0060] 46 Sensor [0061] 47 Sensor [0062] 48 Magnet [0063] OT Top dead center [0064] UT Bottom dead center
    权利要求:
    Claims (1)
    [1" id="c-fr-0001]
    claims [Claim 1] Pump comprising a membrane pump module (10) having at least one sensor (41, 44, 45, 46, 47) for detecting that the top dead center (OT) and / or the bottom dead center (UT) has been reached ) of the diaphragm pump module (10). [Claim 2] Pump according to claim 1, characterized in that the sensor (41) is a microphone for detecting the stop noise generated by the diaphragm (12) of the diaphragm pump module (10) when the diaphragm abuts against a stop (42) . [Claim 3] Pump according to claim 1, characterized in that the sensor (43) is a camera or a photodetector for detecting the position of the diaphragm (12) of the diaphragm pump module (10). [Claim 4] Pump according to claim 1, characterized in that the sensor (45) is a Hall effect sensor for detecting the distance from the diaphragm (12) of the diaphragm pump module (10). [Claim 5] Pump according to claim 1, characterized in that the sensor (46) is a Hall effect sensor, for measuring the homogeneity of the magnetic field in the diaphragm pump module (10). [Claim 6] Pump according to claim 1, characterized in that the sensor (47) is a TMR sensor for detecting the angle of rotation of a magnet (48) associated with the diaphragm pump module (10). [Claim 7] Pump according to one of claims 1 to 6, characterized in that it comprises an inlet (20) and an outlet (30), the inlet (20) being equipped with an inlet valve (21) and the outlet (30) of an outlet valve (31) and each valve (21, 31) has a closure element (22, 32) for putting the inlet (20) or the outlet (30) in the closed position , a return element (23, 33) for pushing the closure element (22, 32) by a return force into its closed position and an actuator (24, 34) for releasing the closure element ( 22, 32) from its closed position. [Claim 8] Method for determining the top dead center (OT) and / or the bottom dead center (UT) of a diaphragm pump module (10) according to one of claims 1 to 7, according to which the top dead center ( OT) using a sensor (41, 44, 45, 46, 47). [Claim 9] Method according to claim 8, characterized in that the pump is a pump according to claim 2 and its top dead center is recognized when the microphone detects the stop noise.
    [Claim 10] Method according to claim 8, characterized in that the pump is a pump according to claim 3 and its top dead center is recognized when the camera or the photodetector detects that the membrane has arrived in its top position. [Claim 11] Method according to claim 8, characterized in that the pump is a pump according to claim 4 and its top dead center is recognized when the distance between the Hall effect sensor and the membrane is detected at its minimum value. [Claim 12] Method according to claim 8, characterized in that the pump is a pump according to claim 5 and the top dead center is recognized when the Hall effect sensor detects the occurrence of an inhomogeneity. [Claim 13] Method according to claim 8, characterized in that the pump is a pump according to claim 6 and the top dead center is determined from the angle of rotation of the magnet. [Claim 14] Method of managing a pump according to claim 7, in which in discharge mode the inlet valve (21) is opened and the outlet valve (31) is closed if the diaphragm pump module (10) moves from its bottom dead center (UT) to its top dead center (OT) and the inlet valve (21) is closed and the outlet valve (31) is opened if the diaphragm pump module (10) moves from its top dead center (OT) towards its bottom dead center (UT),in reverse discharge mode, the inlet valve (21) is closed and the outlet valve (31) is opened if the diaphragm pump module (10) moves from its bottom dead center (UT) to its neutral position up (OT) and the inlet valve (21) is opened and the outlet valve (31) is closed if the diaphragm pump module (10) moves from its top dead center (OT) to its bottom dead center (UT), andthe top dead center is determined by the method according to one of claims 7 to 13. [Claim 15] Computer program designed to execute each step of the process according to one of Claims 7 to 14. [Claim 16] A machine readable memory medium comprising the recording of a computer program according to claim 15.
    [Claim 17]
    Electronic control device designed to determine the top dead center (OT) and / or the bottom dead center (UT) of a diaphragm pump module (10) of a pump, using a method according to 'one of re10 vendications 7 to 13 and / or a pump applying the method according to vendication 14.
    类似技术:
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    同族专利:
    公开号 | 公开日
    DE102018212985A1|2020-02-06|
    CN110792581A|2020-02-14|
    US20200040887A1|2020-02-06|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE102019212831A1|2019-08-27|2021-03-04|Robert Bosch Gmbh|Method for operating a pump and SCR supply system with such a pump|
    DE102019219633A1|2019-12-14|2021-06-17|Robert Bosch Gmbh|Procedure for calibrating and operating a pump|
    DE102019219636A1|2019-12-14|2021-06-17|Robert Bosch Gmbh|Method for operating a fluid supply system and fluid supply system|
    DE102020211030A1|2020-09-02|2022-03-03|Robert Bosch Gesellschaft mit beschränkter Haftung|Method of operating a pump and fluid supply system using such a pump|
    法律状态:
    2020-07-27| PLFP| Fee payment|Year of fee payment: 2 |
    2021-07-22| PLFP| Fee payment|Year of fee payment: 3 |
    2021-08-13| PLSC| Search report ready|Effective date: 20210813 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102018212985.1|2018-08-03|
    DE102018212985.1A|DE102018212985A1|2018-08-03|2018-08-03|Pump and method for operating it and for determining an upper and / or lower dead center|
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