CN113757354B - Control method and device for electronic oil pump of automatic gearbox - Google Patents
Control method and device for electronic oil pump of automatic gearbox Download PDFInfo
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- CN113757354B CN113757354B CN202111184143.9A CN202111184143A CN113757354B CN 113757354 B CN113757354 B CN 113757354B CN 202111184143 A CN202111184143 A CN 202111184143A CN 113757354 B CN113757354 B CN 113757354B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H61/0025—Supply of control fluid; Pumps therefore
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H61/0025—Supply of control fluid; Pumps therefore
- F16H61/0031—Supply of control fluid; Pumps therefore using auxiliary pumps, e.g. pump driven by a different power source than the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0262—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being hydraulic
- F16H61/0276—Elements specially adapted for hydraulic control units, e.g. valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H2061/0075—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by a particular control method
- F16H2061/0087—Adaptive control, e.g. the control parameters adapted by learning
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
Abstract
The application discloses a control method and a device of an electronic oil pump of an automatic gearbox, wherein the control method comprises the following steps: determining the expected cooling flow of the hydraulic oil supply system according to the current working condition; determining a first maximum cooling flow of a current mechanical oil pump; calculating a difference between the desired cooling flow rate and the first maximum cooling flow rate as a first difference; judging whether the first difference is larger than a preset value or not; if yes, collecting a first current temperature of the gearbox; judging whether the first current temperature is higher than the allowable working temperature of the electronic oil pump; if yes, the electronic oil pump is started. According to the electronic oil pump control system, the temperature of the gearbox is used as the condition for triggering the electronic oil pump to start and close, and the safety of the electronic oil pump and the reliability of the gearbox assembly are effectively guaranteed.
Description
Technical Field
The application relates to the technical field of automobiles, in particular to a control method and a device for an electronic oil pump of an automatic gearbox.
Background
With increasingly stricter fuel consumption and emission regulations, more automatic gearboxes matched with passenger cars adopt a mechanical oil pump and electronic oil pump technology, the loss of a hydraulic system of the automatic gearbox is reduced by reducing the displacement of the mechanical oil pump, and meanwhile, the electronic oil pump is utilized to supplement the problem of insufficient flow caused by reducing the displacement of the mechanical oil pump under certain working conditions.
However, in the prior art, once the problem of insufficient flow occurs, the electronic oil pump is started, so that the safety of the electronic oil pump cannot be ensured due to the fact that the internal environment of the gearbox is not suitable for the operation of the electronic oil pump, and the reliability of the gearbox assembly is endangered.
Disclosure of Invention
The application provides a control method and a control device for an electronic oil pump of an automatic gearbox, wherein the temperature of the gearbox is used as a condition for triggering the starting and the closing of the electronic oil pump, so that the safety of the electronic oil pump and the reliability of a gearbox assembly are effectively ensured.
The application provides a control method of an electronic oil pump of an automatic gearbox, which comprises the following steps:
determining the expected cooling flow of the hydraulic oil supply system according to the current working condition;
determining a first maximum cooling flow of a current mechanical oil pump;
calculating a difference between the desired cooling flow rate and the first maximum cooling flow rate as a first difference;
judging whether the first difference is larger than a preset value or not;
if yes, collecting a first current temperature of the gearbox;
judging whether the first current temperature is higher than the allowable working temperature of the electronic oil pump;
if yes, the electronic oil pump is started.
Preferably, the method further comprises:
under the condition that the electronic oil pump is started, determining a second maximum cooling flow of the current mechanical oil pump;
calculating a difference between the desired cooling flow rate and a second maximum cooling flow rate as a second difference;
judging whether the second difference is smaller than a preset value;
if yes, collecting a second current temperature of the gearbox;
judging whether the second current temperature is lower than the highest allowable working temperature of the gearbox;
if yes, stopping the electronic oil pump.
Preferably, the main pressure is raised before the electronic oil pump is started;
and when the main pressure is larger than the opening pressure of the reversing valve, starting the electronic oil pump.
Preferably, if the second current temperature is lower than the maximum allowable operating temperature of the transmission, the electronic oil pump is controlled to be operated with a delay for a predetermined time before stopping the electronic oil pump.
Preferably, the electronic oil pump is controlled to operate at the first rotational speed if the first difference or the second difference is between the preset value and the first flow rate.
Preferably, if the first difference or the second difference is between the first flow rate and the second flow rate, controlling the electronic oil pump to operate at the second rotation speed;
the first flow is smaller than the second flow, and the first rotating speed is smaller than the second rotating speed.
Preferably, if the first difference or the second difference is greater than the second flow rate, controlling the electronic oil pump to operate at a third rotational speed;
wherein the second rotational speed is less than the third rotational speed.
The application also provides a control device of the electronic oil pump of the automatic gearbox, which comprises an expected flow determining module, a maximum flow calculating module, a difference calculating module, a judging module, a gearbox temperature acquisition module and an electronic oil pump control module;
the expected flow determining module is used for determining expected cooling flow according to the current working condition;
the maximum flow calculation module is used for determining the first maximum cooling flow of the current mechanical oil pump;
the difference value calculation module is used for calculating the difference between the expected cooling flow and the first maximum cooling flow as a first difference;
the judging module is used for judging whether the first difference is larger than a preset value or not;
the gearbox temperature acquisition module is used for acquiring a first current temperature of the gearbox;
the judging module is also used for judging whether the first current temperature is higher than the working temperature of the electronic oil pump;
the electronic oil pump control module is used for starting the electronic oil pump.
Preferably, the maximum flow calculation module is further configured to determine a second maximum cooling flow rate of the current mechanical oil pump in case of starting of the electronic oil pump;
the difference calculation module is further configured to calculate a difference between the desired cooling flow rate and a second maximum cooling flow rate as a second difference;
the judging module is also used for judging whether the second difference is larger than a preset value or not;
the gearbox temperature acquisition module is also used for acquiring a second current temperature of the gearbox;
the judging module is also used for judging whether the second current temperature is lower than the highest allowable working temperature of the gearbox;
the electronic oil pump control module is also used for stopping the electronic oil pump.
Preferably, the electronic oil pump further comprises a main pressure control module, wherein the main pressure control module is used for raising the main pressure to be higher than the opening pressure of the reversing valve before starting the electronic oil pump and reducing the main pressure to be lower than the opening pressure of the reversing valve after stopping the electronic oil pump.
Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the present application, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
FIG. 1 is a schematic diagram of a hydraulic oil supply system for a transmission provided herein;
FIG. 2 is a flow chart of a control method of an electronic oil pump of an automatic transmission provided by the present application;
FIG. 3 is a schematic operation diagram of the electronic oil pump starting process provided by the present application;
FIG. 4 is a schematic operation diagram of the stopping process of the electronic oil pump provided by the present application;
fig. 5 is a structural diagram of a control device of an electronic oil pump of an automatic transmission provided by the present application.
Detailed Description
Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and apparatus should be considered part of the specification.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
The application provides a control method and a control device for an electronic oil pump of an automatic gearbox, wherein the temperature of the gearbox is used as a condition for triggering the starting and the closing of the electronic oil pump, so that the safety of the electronic oil pump and the reliability of a gearbox assembly are effectively ensured. In addition, the electronic oil pump in the application adopts stepped rotating speed output, so that the noise problem caused by continuous change of the rotating speed is effectively reduced, and the driving experience is improved.
Fig. 1 shows a hydraulic oil supply system having a mechanical oil pump 3 and an electronic oil pump 7, wherein the mechanical oil pump 3 is used as a main pump, driven by an engine 1, and the electronic oil pump 7 is driven by an electric motor 8. The input ends of the mechanical oil pump 3 and the electronic oil pump 7 are respectively connected with the suction filter 5 through one- way valves 4 and 6 for inputting purified oil. The motor 8 is controlled by a gearbox control unit 12 (Transmission Control Unit, TCU). The oil outlet of the mechanical oil pump 3 is connected with a high-pressure branch 10, and the high-pressure branch 10 is connected with a flow distribution unit 14.
A reversing valve 9 is arranged in the hydraulic oil supply system, an actuator (shown as a spring in fig. 1) of the reversing valve 9 is connected with the oil outlet of the mechanical oil pump 3, and the actuator controls reversing of the reversing valve 9 according to the main pressure provided by the oil outlet of the mechanical oil pump 3. An oil inlet of the reversing valve 9 is connected to the electronic oil pump 7, a first outlet of the reversing valve 9 is connected to the high-pressure branch 10, and a second outlet of the reversing valve 9 is connected to the cooling branch 11. In the first position of the reversing valve 9 (left position in fig. 1), the electronic oil pump 7 supplies flow to both the high-pressure branch 10 and the cooling branch 11. In the second position of the reversing valve 9 (right position in fig. 1), the electronic oil pump 7 supplies only flow to the high-pressure branch 10 and not to the cooling branch 11. The first outlet of the reversing valve 9 is provided with a one-way valve 13, so that the high-pressure branch is prevented from being impacted by pressure in the reversing process.
The flow distribution unit 14 is used for adjusting the flow required by cooling, gear shifting and the like in the high-pressure branch, and the flow distributed by the flow distribution unit 14 and the flow obtained by the cooling branch 11 together form the cooling flow of the hydraulic oil supply system.
The high-pressure branch 10 is provided with a pressure sensor 2 for detecting the pressure of the high-pressure branch, i.e. the main pressure provided by the mechanical oil pump 3. The pressure sensor 2 transmits a pressure signal to the TCU, which controls the engine 1 and the motor 8 according to the pressure signal to control the flow rates of the mechanical oil pump 3 and the electronic oil pump 7.
As an example, the reversing valve 9 is a two-position three-way mechanical spool valve, as shown in fig. 1.
When the electronic oil pump 7 is connected to the cooling branch, the load pressure is smaller, the rotating speed of the electronic oil can be higher, and more flow is output under the limitation of the power of the motor 8.
Based on the above structure, as shown in fig. 2, the control method of the electronic oil pump includes:
s2010: and determining the expected cooling flow Q1 of the hydraulic oil supply system according to the current working condition.
Under different whole vehicle operation conditions, the expected cooling flow of the hydraulic oil supply system is different.
S2020: a first maximum cooling flow Q2 of the current mechanical oil pump is determined.
S2030: the difference between the desired cooling flow rate Q1 and the first maximum cooling flow rate Q2 is calculated as a first difference Q3.
S2040: it is determined whether the first difference Q3 is greater than a preset value (e.g., 0). If yes, executing S2050; otherwise, S2080 is executed.
If the first difference Q3 is greater than the preset value, it indicates that the flow provided by the mechanical oil pump is insufficient, and the electronic oil pump is required to assist in oil supply.
S2050: a first current temperature T1 of the gearbox is acquired.
S2060: it is determined whether the first current temperature T1 is higher than the operating temperature Ti of the electronic oil pump. If yes, executing S2070; otherwise, S2080 is executed.
If the first current temperature T1 is higher than the allowable operating temperature Ti of the electronic oil pump, the electronic oil pump may be operated in a normal environment. Otherwise, the safety of the electronic oil pump cannot be ensured, so that the reliability of the gearbox assembly is endangered, and the electronic oil pump is not started.
S2070: and starting the electronic oil pump.
In the configuration shown in fig. 1, the electronic oil pump is only able to supply the hydraulic oil supply system when the reversing valve is shifted from the second position (right position in fig. 1) to the first position (left position in fig. 1), and the action of the actuator of the reversing valve is determined by the main pressure provided by the mechanical oil pump. Therefore, as shown in fig. 3, when the desired cooling flow Q1 starts to increase and the maximum cooling flow Q2 output by the mechanical oil pump cannot meet the desired cooling flow, the main pressure needs to be raised above the opening pressure of the reversing valve (i.e. the main pressure is greater than the opening pressure of the reversing valve), so that the reversing valve reverses, and the electronic oil pump can be started to supplement the oil quantity. As an example, as shown in fig. 1, the opening pressure of the reversing valve is the elastic force of a spring.
S2080: the electronic oil pump does not operate.
Under the condition that the electronic oil pump is started, the following steps are continuously executed:
s2090: a second maximum cooling flow Q4 of the current mechanical oil pump is determined.
S2100: the difference between the desired cooling flow rate Q1 and the second maximum cooling flow rate Q4 is calculated as a second difference Q5.
S2110: it is determined whether the second difference Q5 is smaller than a preset value. If yes, executing S2120; otherwise, S2150 is performed.
If the second difference Q5 is smaller than the preset value, it indicates that the oil amount of the mechanical oil pump can meet the desired cooling flow rate of the hydraulic oil supply system.
S2120: a second current temperature T2 of the gearbox is acquired.
S2130: it is determined whether the second current temperature T2 is lower than the maximum allowable operating temperature Tj of the gearbox. If yes, executing S2140; otherwise, S2150 is performed.
If the second current temperature T2 is lower than the highest allowable working temperature Tj of the gearbox, the temperature of the gearbox is in a controllable range when the oil quantity of the mechanical oil pump meets the expected cooling flow of the hydraulic oil supply system, and the electronic oil pump is stopped so as not to influence the normal working of the gearbox.
S2140: the electronic oil pump is stopped.
As shown in fig. 4, when the flow rate outputted from the mechanical oil pump can satisfy the desired cooling flow rate of the system, the operation of the electronic oil pump is delayed for a predetermined time in order to secure the safety of the system, and then the electronic oil pump is stopped, whereby the flow rate of the electronic oil pump is reduced. The main pressure provided by the mechanical oil pump is gradually reduced below the opening pressure of the reversing valve, so that the reversing valve is reversed and is prepared for the next reversing.
S2150: and continuing to operate the electronic oil pump.
If the second current temperature T2 is higher than the highest allowable working temperature Tj of the gearbox, the temperature of the gearbox is too high, and cooling is required, so that the electronic oil pump needs to be continuously operated.
Preferably, during operation of the electronic oil pump, the rotational speed of the electronic oil pump is controlled in dependence on the difference value of the first difference or the second difference, i.e. a stepped output is used.
As one example, the difference and rotational speed are in the following scale:
the preset value is smaller than the first flow rate and smaller than the second flow rate, and the first rotating speed is smaller than the second rotating speed and smaller than the third rotating speed.
Example two
Based on the control method of the electronic oil pump, the application provides a control device of the electronic oil pump. As shown in fig. 5, the control device of the electronic oil pump includes a desired flow rate determining module 510, a maximum flow rate calculating module 520, a difference calculating module 530, a judging module 540, a gearbox temperature collecting module 550, and an electronic oil pump control module 560.
The expected flow determination module 510 is configured to determine an expected cooling flow based on the current operating conditions.
The maximum flow calculation module 520 is configured to determine a first maximum cooling flow for the current mechanical oil pump.
The difference calculation module 530 is configured to calculate a difference between the desired cooling flow rate and the first maximum cooling flow rate as a first difference.
The determining module 540 is configured to determine whether the first difference is greater than a preset value.
The gearbox temperature acquisition module 550 is used to acquire a first current temperature of the gearbox.
The determining module 540 is further configured to determine whether the first current temperature is higher than an allowable operating temperature of the electronic oil pump.
The electronic oil pump control module 560 is used to start the electronic oil pump.
The maximum flow calculation module 520 is further configured to determine a second maximum cooling flow rate of the current mechanical oil pump in the event of an electronic oil pump start.
The difference calculation module 530 is also configured to calculate a difference between the desired cooling flow rate and a second maximum cooling flow rate as a second difference.
The determining module 540 is further configured to determine whether the second difference is greater than a preset value.
The gearbox temperature acquisition module 550 is also used to acquire a second current temperature of the gearbox.
The determining module 540 is further configured to determine whether the second current temperature is lower than a maximum allowable operating temperature of the transmission.
The electronic oil pump control module 560 is also configured to stop the electronic oil pump.
Preferably, the control device of the electronic oil pump further comprises a main pressure control module 570, wherein the main pressure control module 570 is used for raising the main pressure to be higher than the opening pressure of the reversing valve before starting the electronic oil pump, and reducing the main pressure to be lower than the opening pressure of the reversing valve after stopping the electronic oil pump.
Preferably, the control device of the electronic oil pump further comprises a delay module 580, and the delay module 580 is used for controlling the electronic oil pump to delay running for a preset time before stopping the electronic oil pump.
Although specific embodiments of the present application have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.
Claims (8)
1. A control method of an electronic oil pump of an automatic transmission, characterized by comprising:
determining the expected cooling flow of the hydraulic oil supply system according to the current working condition;
determining a first maximum cooling flow of a current mechanical oil pump;
calculating a difference between the desired cooling flow rate and the first maximum cooling flow rate as a first difference;
judging whether the first difference is larger than a preset value or not;
if yes, collecting a first current temperature of the gearbox;
judging whether the first current temperature is higher than the working temperature of the electronic oil pump;
if yes, starting the electronic oil pump; the control method of the electronic oil pump further comprises the following steps:
under the condition that the electronic oil pump is started, determining a second maximum cooling flow of the current mechanical oil pump;
calculating a difference between the desired cooling flow rate and the second maximum cooling flow rate as a second difference;
judging whether the second difference is smaller than the preset value;
if yes, collecting a second current temperature of the gearbox;
judging whether the second current temperature is lower than the highest allowable working temperature of the gearbox;
if yes, stopping the electronic oil pump; otherwise, the electronic oil pump is continuously operated.
2. The control method of an electronic oil pump of an automatic transmission according to claim 1, characterized in that a main pressure is raised before the electronic oil pump is started;
and when the main pressure is larger than the opening pressure of the reversing valve, starting the electronic oil pump.
3. The control method of an electronic oil pump of an automatic transmission according to claim 1, characterized in that if the second current temperature is lower than a maximum operating temperature allowed by the transmission, the electronic oil pump is controlled to be operated with a delay for a predetermined time before stopping the electronic oil pump.
4. The control method of an electronic oil pump of an automatic transmission according to claim 1, characterized in that if the first difference or the second difference is between the preset value and a first flow rate, the electronic oil pump is controlled to operate at a first rotational speed.
5. The control method of an electronic oil pump of an automatic transmission according to claim 4, characterized by controlling the electronic oil pump to operate at a second rotational speed if the first difference or the second difference is between the first flow rate and the second flow rate;
wherein the first flow is less than the second flow, and the first rotational speed is less than the second rotational speed.
6. The control method of an electronic oil pump of an automatic transmission according to claim 5, characterized by controlling the electronic oil pump to operate at a third rotational speed if the first difference or the second difference is greater than the second flow rate;
wherein the second rotational speed is less than the third rotational speed.
7. The control device of the electronic oil pump of the automatic gearbox is characterized by comprising an expected flow determining module, a maximum flow calculating module, a difference calculating module, a judging module, a gearbox temperature acquisition module and an electronic oil pump control module;
the expected flow determining module is used for determining expected cooling flow according to the current working condition;
the maximum flow calculation module is used for determining a first maximum cooling flow of the current mechanical oil pump;
the difference calculation module is used for calculating the difference between the expected cooling flow and the first maximum cooling flow as a first difference;
the judging module is used for judging whether the first difference is larger than a preset value or not;
the gearbox temperature acquisition module is used for acquiring a first current temperature of the gearbox;
the judging module is also used for judging whether the first current temperature is higher than the allowable working temperature of the electronic oil pump;
the electronic oil pump control module is used for starting the electronic oil pump; the maximum flow calculation module is further used for determining a second maximum cooling flow of the current mechanical oil pump under the condition that the electronic oil pump is started;
the difference calculation module is further configured to calculate a difference between the desired cooling flow rate and the second maximum cooling flow rate as a second difference;
the judging module is further used for judging whether the second difference is larger than a preset value or not;
the gearbox temperature acquisition module is also used for acquiring a second current temperature of the gearbox;
the judging module is also used for judging whether the second current temperature is lower than the highest allowable working temperature of the gearbox;
the electronic oil pump control module is also used for stopping the electronic oil pump and continuing to operate the electronic oil pump.
8. The control device of an electronic oil pump of an automatic transmission according to claim 7, further comprising a main pressure control module for raising a main pressure above a cracking pressure of a reversing valve before starting the electronic oil pump and lowering the main pressure below the cracking pressure of the reversing valve after stopping the electronic oil pump.
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| CN202111184143.9A CN113757354B (en) | 2021-10-11 | 2021-10-11 | Control method and device for electronic oil pump of automatic gearbox |
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| CN202111184143.9A CN113757354B (en) | 2021-10-11 | 2021-10-11 | Control method and device for electronic oil pump of automatic gearbox |
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| CN105805284B (en) * | 2014-12-31 | 2019-12-10 | 比亚迪股份有限公司 | Gearbox lubricating system and method suitable for hybrid electric vehicle |
| CN105805285B (en) * | 2014-12-31 | 2019-06-07 | 比亚迪股份有限公司 | Gearbox lubrication method and speed changing box lubricating system suitable for hybrid vehicle |
| EP3276214A4 (en) * | 2015-03-25 | 2018-04-04 | Jatco Ltd | Automatic transmission, and electric oil pump control method |
| CN108644366B (en) * | 2018-07-12 | 2019-12-31 | 安徽江淮汽车集团股份有限公司 | Oil supply and lubrication system for gearbox |
| CN109139895A (en) * | 2018-11-16 | 2019-01-04 | 安徽江淮汽车集团股份有限公司 | A kind of double pump fuel feeding and lubricating and cooling system |
| CN109555852A (en) * | 2018-11-30 | 2019-04-02 | 安徽江淮汽车集团股份有限公司 | A kind of control method and system of automatic gear-box hydraulic electronic pump |
| CN111441926A (en) * | 2019-01-17 | 2020-07-24 | 上海汽车集团股份有限公司 | Hybrid gearbox driving motor cooling electric oil pump system and control method |
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