阅读说明：本技术 一种混动变速箱驱动电机冷却电动油泵系统及控制方法 (Hybrid gearbox driving motor cooling electric oil pump system and control method ) 是由 陈颖宇 黄岩松 唐偲蓓 张燕 吕成 于 2019-01-17 设计创作，主要内容包括：本发明提供了一种混动变速箱驱动电机冷却电动油泵系统及控制方法,包括：吸滤器用于吸纳混动变速箱底部的油液,油泵用于将吸滤器吸纳的油液泵出,油泵电机用于为油泵提供转速和扭矩；油泵电机用于为油泵电机提供电源,通过LIN信号与HCU进行通信,将采集的电动油泵集成系统的状态信号反馈给HCU,并根据HCU的控制指令,控制电动油泵在-30℃至145℃的工况内,将油液作为冷却介质提供给混动变速箱,可见,本申请通过将油泵电机控制器集成在电动油泵系统中,控制电动油泵系统在-30℃至145℃的工况范围内持续稳定的为变速箱提供冷却介质,扩展了电动油泵的正常工作温度范围,并且通过LIN信号进行通信,也降低了开发成本。(The invention provides a hybrid transmission driving motor cooling electric oil pump system and a control method, wherein a suction filter is used for sucking oil at the bottom of a hybrid transmission, an oil pump is used for pumping out the oil sucked by the suction filter, an oil pump motor is used for providing rotating speed and torque for the oil pump, the oil pump motor is used for providing power for the oil pump motor, the oil pump motor is communicated with an HCU through L IN signals, collected state signals of an electric oil pump integrated system are fed back to the HCU, the electric oil pump is controlled to be IN a working condition of-30 ℃ to 145 ℃ according to control instructions of the HCU, and the oil is used as a cooling medium to be provided for the hybrid transmission.)

1. A hybrid transmission drive motor cooled electric oil pump system, characterized in that said system comprises: a suction filter, an oil pump motor and an oil pump motor controller;

the suction filter is used for sucking oil at the bottom of the hybrid transmission case;

the oil pump is used for pumping out the oil absorbed by the suction filter;

the oil pump motor is used for providing rotating speed and torque for the oil pump;

the oil pump motor controller is electrically connected with the oil pump motor and used for providing power supply for the oil pump motor;

oil pump motor controller carries out communication connection through L IN signal and whole car driving motor controller HCU for the state signal feedback of the electric oil pump integrated system who gathers is to HCU, and according to HCU's control command, control when the electric oil pump is IN the ambient oil temperature and is-30 ℃ to 145 ℃, will fluid is as cooling medium, and the continuous stable confession mixes the gear box that moves.

2. The control system of claim 1, further comprising: an oil pump driving block;

the oil pump driving block is made of high-abrasion-resistance injection molding materials and is used for connecting the oil pump with a rotating shaft of the oil pump motor.

3. The control system of claim 1, wherein the oil pump, the oil pump motor and the oil pump motor controller are connected and integrated by a specially-made long bolt, and then fixed at the bottom of the shell by a connecting bolt of the shell and the oil pump.

4. A control method of a hybrid transmission drive motor cooling electric oil pump system, characterized in that the control method employs the system of any one of claims 1 to 3, the method is applied to an oil pump motor controller integrated in the electric oil pump system, the method includes,

acquiring the ambient oil temperature of the electric oil pump;

judging whether the ambient oil temperature meets a preset temperature threshold range or not;

if so, controlling the electric oil pump to continuously and stably supply oil serving as a cooling medium to the hybrid transmission case, wherein the oil is absorbed from the bottom of the hybrid transmission case by using an absorption filter;

if not, the electric oil pump is controlled to be powered off, and the work is stopped.

5. The method of claim 4, wherein the preset temperature threshold range is a first temperature threshold range;

then after judging that the environmental oil temperature satisfies preset temperature threshold value scope, control the electric oil pump regards fluid as coolant, and the continuous stable confession mixes the dynamic gearbox that includes:

determining a target rotating speed of the electric oil pump according to the environmental oil temperature;

determining the three-phase current duty ratio output by the electric oil pump according to the target rotating speed;

calculating the actual rotating speed of the electric oil pump according to the induced electromotive force of the motor;

and regulating the three-phase current duty ratio according to the actual rotating speed and in combination with the target rotating speed to realize closed-loop control so as to continuously and stably provide the oil liquid for the hybrid gearbox.

6. The method according to claim 5, wherein the first temperature threshold range is 5 ℃ to 145 ℃, wherein the boundary values 5 ℃ and 145 ℃ are excluded.

7. The method of claim 4, wherein the preset temperature threshold range is a second temperature threshold range;

then after judging that the environmental oil temperature satisfies preset temperature threshold value scope, control the electric oil pump regards fluid as coolant, and the continuous stable confession mixes the dynamic gearbox that includes:

determining a target rotating speed of the electric oil pump according to the environmental oil temperature;

and determining the lowest stable rotating speed of the closed-loop control of the electric oil pump according to the target rotating speed, and realizing the closed-loop control according to the lowest stable rotating speed so as to continuously and stably provide the oil liquid for the hybrid gearbox.

8. The method of claim 7, wherein the second temperature threshold ranges from-5 ℃ to 5 ℃, inclusive, of-5 ℃ inclusive, and 5 ℃ inclusive.

9. The method of claim 4, wherein the preset temperature threshold range is a third temperature threshold range;

then after judging that the environmental oil temperature satisfies preset temperature threshold value scope, control the electric oil pump regards fluid as coolant, and the continuous stable confession mixes the dynamic gearbox that includes:

determining a constant current of the electric oil pump according to the ambient oil temperature;

and starting the electric oil pump to realize open-loop control according to the constant current so as to continuously and stably provide oil for the hybrid gearbox.

10. The method according to claim 9, wherein the third temperature threshold is in the range of-30 ℃ to-5 ℃, inclusive of the boundary values of-30 ℃ and-5 ℃.

Technical Field

The invention relates to the technical field of electric oil pumps, in particular to a hybrid transmission case driving motor cooling electric oil pump system and a control method.

Background

The hybrid vehicle is equipped with an electric oil pump that can be operated regardless of the operation of the engine, in addition to a mechanical oil pump equipped in the transmission, so that oil necessary for the transmission can be supplied even in a case where, for example, the engine is not operated.

The built-in electric oil pump of the traditional energy gearbox has two applications: the electromagnetic valve is used for pressurizing an energy accumulator or a clutch actuating mechanism, controls the current of a motor according to the command of a TCU, regulates the flow of hydraulic oil and realizes the accurate control of gears; the other is applied to a gearbox start-stop system, and when a main oil pump driven by an engine does not work, the short-time cooling and hydraulic pressure are provided for the gearbox. However, the normal operating temperature range of the conventional electric oil pump is limited (for example, the conventional electric oil pump can only operate at a normal temperature), the conventional electric oil pump cannot serve as a cooling main oil pump to continuously supply oil to the gearbox for a long time, and the cost after the motor controller is integrated is high.

In addition, in a P2 type hybrid transmission, the driving motor is integrated inside the transmission, and the real-time cooling of the oil cooling system is just the necessary guarantee that the driving motor can work efficiently for a long time. However, the electric main cooling oil pump cannot take power from the engine, and the conventional electric oil pump cannot serve as the main oil pump to supply a continuous cooling medium (oil) to the drive motor for a long time.

Therefore, how to extend the normal operating temperature range of the electric oil pump and to realize the purpose of continuously and stably supplying the cooling medium (oil) to the hybrid transmission case for a long time on the premise of low cost has become a problem to be solved.

Disclosure of Invention

In view of the above, an embodiment of the present invention provides a hybrid transmission driving motor cooling electric oil pump system and a control method thereof, which can extend a normal operating temperature range of an electric oil pump and provide a cooling medium for a hybrid transmission continuously and stably for a long time on the premise of low cost.

In a first aspect, an embodiment of the present application provides a hybrid transmission case driving motor cooling electric oil pump system, the system includes: a suction filter, an oil pump motor and an oil pump motor controller;

the suction filter is used for sucking oil at the bottom of the hybrid transmission case;

the oil pump is used for pumping out the oil absorbed by the suction filter;

the oil pump motor is used for providing rotating speed and torque for the oil pump;

the oil pump motor controller is electrically connected with the oil pump motor and used for providing power supply for the oil pump motor;

oil pump motor controller carries out communication connection through L IN signal and whole car driving motor controller HCU for the state signal feedback of the electric oil pump integrated system who gathers is to HCU, and according to HCU's control command, control when the electric oil pump is IN the ambient oil temperature and is-30 ℃ to 145 ℃, will fluid is as cooling medium, and the continuous stable confession mixes the gear box that moves.

Optionally, the system further includes: an oil pump driving block;

the oil pump driving block is made of high-abrasion-resistance injection molding materials and is used for connecting the oil pump with a rotating shaft of the oil pump motor.

Optionally, the oil pump includes: a rotor and a ring gear;

and the rotor and the gear ring are used for sucking the oil absorbed by the suction filter into the oil pump.

Optionally, the oil pump motor and the oil pump motor controller are connected and integrated into a whole through a specially-made long bolt, and then fixed at the bottom of the shell through a connecting bolt of the shell and the oil pump.

Optionally, the system further includes: a thermistor;

the thermistor is welded outside the oil pump motor controller and used for collecting the ambient oil temperature of the electric oil pump.

Optionally, the system further includes: a magnet;

the magnet is positioned on the suction filter and used for adsorbing scrap iron in the oil of the hybrid transmission case.

Optionally, the system further includes:

a heat conduction groove is further arranged between the upper cover and the lower cover of the oil pump motor controller;

epoxy silica gel is further added at the joint of the PIN needle of the electric oil pump integrated system and the injection molding material;

the material that uses when the PIN needle with oil pump motor controller casing is moulded plastics for the first time is PA6, and the material that uses when moulding plastics for the second time is PA 66.

In a second aspect, an embodiment of the present application provides a control method for a hybrid transmission drive motor cooling electric oil pump system, where the control method employs the system according to the first aspect, and the method is applied to an oil pump motor controller integrated in the electric oil pump system, and the method includes:

acquiring the ambient oil temperature of the electric oil pump;

judging whether the ambient oil temperature meets a preset temperature threshold range or not;

if so, controlling the electric oil pump to continuously and stably supply oil serving as a cooling medium to the hybrid transmission case, wherein the oil is absorbed from the bottom of the hybrid transmission case by using an absorption filter;

if not, the electric oil pump is controlled to be powered off, and the work is stopped.

Optionally, the preset temperature threshold range is a first temperature threshold range;

then after judging that the environmental oil temperature satisfies preset temperature threshold value scope, control the electric oil pump regards fluid as coolant, and the continuous stable confession mixes the dynamic gearbox that includes:

determining a target rotating speed of the electric oil pump according to the environmental oil temperature;

determining the three-phase current duty ratio output by the electric oil pump according to the target rotating speed;

calculating the actual rotating speed of the electric oil pump according to the induced electromotive force of the motor;

and regulating the three-phase current duty ratio according to the actual rotating speed and in combination with the target rotating speed to realize closed-loop control so as to continuously and stably provide the oil liquid for the hybrid gearbox.

Optionally, the first temperature threshold range is 5 ℃ to 145 ℃, wherein the boundary values 5 ℃ and 145 ℃ are not included.

Optionally, the preset temperature threshold range is a second temperature threshold range;

then after judging that the environmental oil temperature satisfies preset temperature threshold value scope, control the electric oil pump regards fluid as coolant, and the continuous stable confession mixes the dynamic gearbox that includes:

determining a target rotating speed of the electric oil pump according to the environmental oil temperature;

and determining the lowest stable rotating speed of the closed-loop control of the electric oil pump according to the target rotating speed, and realizing the closed-loop control according to the lowest stable rotating speed so as to continuously and stably provide the oil liquid for the hybrid gearbox.

Optionally, the second temperature threshold ranges from-5 ℃ to 5 ℃, wherein the border value of-5 ℃ is excluded, including the border value of 5 ℃.

Optionally, the preset temperature threshold range is a third temperature threshold range;

then after judging that the environmental oil temperature satisfies preset temperature threshold value scope, control the electric oil pump regards fluid as coolant, and the continuous stable confession mixes the dynamic gearbox that includes:

determining a constant current of the electric oil pump according to the ambient oil temperature;

and starting the electric oil pump to realize open-loop control according to the constant current so as to continuously and stably provide oil for the hybrid gearbox.

Optionally, the third temperature threshold range is from-30 ℃ to-5 ℃, inclusive of the boundary values of-30 ℃ and-5 ℃.

The electric oil pump integrated system comprises a suction filter, an oil pump motor and an oil pump motor controller, wherein the suction filter is used for sucking oil at the bottom of the hybrid gearbox, the oil pump is used for pumping the oil sucked by the suction filter, the oil pump motor is used for providing rotating speed and torque for the oil pump, the oil pump motor controller is electrically connected with the oil pump motor and provides power for the oil pump motor, meanwhile, the oil pump motor controller is IN communication connection with a vehicle driving motor controller HCU through L IN signals, collected state signals of the electric oil pump integrated system are fed back to the HCU, the oil pump is used as a cooling medium when the electric oil pump is controlled to be IN a working condition that the environmental oil temperature is-30 ℃ to 145 ℃ according to control instructions of the HCU, the oil pump is continuously and stably provided for the hybrid gearbox, therefore, the oil pump integrated system CAN be used for controlling the electric oil pump system to be IN a working condition range from-30 ℃ to 145 ℃ continuously and stably providing CAN for the hybrid gearbox, the cost of controlling the electric oil pump is greatly reduced compared with the existing control software for developing and controlling the vehicle driving motor.

Drawings

In order to clearly illustrate the detailed implementation of the embodiments of the present invention, the drawings, which are used in describing the detailed implementation, are briefly described below. It should be apparent that these drawings are only a part of the drawings of the embodiments of the present invention, and those skilled in the art can also obtain other drawings without inventive efforts.

FIG. 1 is a block diagram of a hybrid transmission drive motor cooling electric oil pump system according to an embodiment of the present disclosure;

FIG. 2 is a block diagram of an oil pump driving block provided in the embodiment of the present application;

FIG. 3 is a block diagram of a rotor and a ring gear according to an embodiment of the present disclosure;

fig. 4 is a block diagram of an oil pump motor controller provided in an embodiment of the present application;

FIG. 5 is a structural block diagram of a structure optimization of a sealing groove provided by an embodiment of the present application;

FIG. 6 is a schematic flow chart illustrating a method for controlling a hybrid transmission drive motor cooling electric oil pump system according to an embodiment of the present disclosure;

fig. 7 is a schematic overall implementation diagram of a control method for a hybrid transmission drive motor cooling electric oil pump system according to an embodiment of the present application.

Detailed Description

In order to facilitate understanding of the technical solutions provided in the present application, the following briefly describes the research background of the technical solutions in the present application.

As described in the background, compared with the conventional oil pump driven by an engine pulley, the electric oil pump has the characteristics of adjustable rotating speed and pressure and quick response, and is widely applied to a hybrid electric vehicle power assembly. Particularly, the P2 type hybrid integrated form saves the arrangement space of the whole vehicle, and is convenient for the power coupling and the capacity recovery of the engine and the motor.

However, the conventional electric oil pump has a limited normal operating temperature range (for example, the conventional electric oil pump can only operate at a normal temperature), cannot serve as a cooling main oil pump to continuously supply oil to the gearbox for a long time, and is relatively high in cost after being integrated with the motor controller. Moreover, in a P2 type hybrid transmission, the driving motor is integrated inside the transmission, and the real-time cooling effect of the oil cooling system is just the necessary guarantee that the driving motor can work efficiently for a long time. However, the electric main cooling oil pump cannot obtain power from the engine, and the conventional electric oil pump cannot be used as the main oil pump to provide continuous cooling medium (oil) for the driving motor for a long time, so how to extend the normal operating temperature range of the electric oil pump and realize the purpose of providing the cooling medium (oil) for the hybrid transmission continuously and stably for a long time on the premise of low cost becomes a problem to be solved urgently.

Based on the above, the application provides a hybrid transmission driving motor cooling electric oil pump system and a control method thereof, so as to expand the normal working temperature range of the electric oil pump and realize the long-time continuous and stable supply of a cooling medium for the hybrid transmission on the premise of low cost.

In order to make the technical solution of the present invention more clearly understood, the following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings.

First embodiment

Referring to fig. 1, a structural block diagram of a hybrid transmission case driving motor cooling electric oil pump system provided by the embodiment is shown IN fig. 1, and the system includes a suction filter 101, an oil pump 102, an oil pump motor 103, and an oil pump motor controller 104, wherein the suction filter 101 is used for sucking oil at the bottom of the hybrid transmission case, the oil pump 102 is used for pumping out the oil sucked by the suction filter 101, the oil pump motor 103 is connected with the oil pump 102 to provide rotation speed and torque for the oil pump 102, the oil pump motor controller 104 is electrically connected with the oil pump motor 103 to provide power for the oil pump motor 103, and meanwhile, the oil pump motor controller 104 is also IN communication connection with a vehicle driving motor controller HCU through L IN signals, feeds back the acquired state signals of an electric oil pump integrated system to the HCU, and controls the electric oil pump to provide the oil as a cooling medium continuously and stably to the hybrid transmission case when the electric oil pump is IN a working condition that an ambient oil temperature is-30 ℃ to 145 ℃ according to a control instruction of the HCU.

In a possible implementation manner of the present embodiment, the electric oil pump integration system of the present embodiment further includes a magnet 106 located on the suction filter 101, as shown in fig. 1, the magnet 106 is used for adsorbing iron filings in the oil of the hybrid transmission.

In this implementation, when the entry that utilizes the suction filter was absorbed the fluid of transmission housing, can filter the impurity in the lubricating oil through the filtering layer, export and low-pressure oil pump entry cooperation to guarantee that the fluid that gets into the oil pump is clean free from impurity. In addition, for the P2/P3 type hybrid transmission, a common medium, namely gear oil, is used for cooling the driving motor and lubricating the gear shaft of the transmission, scrap iron is inevitably generated after the gear operates, and after oil at the bottom of the transmission shell is absorbed through the inlet of the suction filter, the magnet on the suction filter can be used for adsorbing fine scrap iron in the lubricating oil of the transmission, so that the short-circuit burning of components and parts of exposed copper wires and PIN PINs on the oil pump motor and thermistor welding terminals outside the MCPC shell is prevented.

In a possible implementation manner of the present embodiment, the electric oil pump integrated system of the present embodiment further includes an oil pump driving block 105, as shown in fig. 2, the oil pump driving block 105 is made of a high wear-resistant injection molding material and is used for connecting the rotating shafts of the oil pump 102 and the oil pump motor 103.

In one possible implementation manner of the embodiment, the oil pump 102 in the electric oil pump integrated system includes a rotor 108 and a ring gear 109, as shown in fig. 3, and the rotor 108 and the ring gear 109 are used for sucking oil absorbed by the suction filter 101 into the oil pump 102.

In this implementation, the oil pump motor drives the motor shaft drive block to drive the oil pump inner rotor to rotate at a certain rotational speed. Meanwhile, because the tooth number difference of an inner rotor and a gear ring of the oil pump is 1, a vacuum cavity can be formed, and then oil in the suction filter is sucked into the oil pump, so that the oil is sprayed out along the inner cavity of the oil pump at a certain speed. And the rotating speed and the torque of the oil pump are provided by an oil pump motor, so that the oil pump can overcome the resistance of the oil passage and stably run at a certain rotating speed. The power input of the oil pump motor is from a driving module in the oil pump motor controller circuit, and three-phase current is introduced through a connector on the oil pump motor to realize power supply.

In addition, the oil pump driving block connecting the oil pump rotor and the oil pump motor rotating shaft is a high-wear-resistance injection molding material moving block, such as PA66+ GF30, so that the problem of rapid wear caused by the fact that the motor input shaft directly drives the oil pump inner rotor can be solved, and the high-wear-resistance injection molding material moving block is responsible for torque transmission.

In a possible implementation manner of this embodiment, the oil pump 102, the oil pump motor 103, and the oil pump motor controller 104 in the electric oil pump integrated system may be connected by a special long bolt, integrated into a whole, and fixed at the bottom of the housing by the connecting bolt of the housing and the oil pump. Therefore, the conversion from electric energy to mechanical energy and then to hydraulic energy can be realized, the size is small, the weight is light, the structure is compact, and the internal space of the gearbox is saved.

It should be noted that, IN this embodiment, the oil pump motor controller (MCPC) is provided with a connector, IN addition to being electrically connected to the oil pump motor, for introducing its own power supply, and communicating with the vehicle drive motor controller (HCU) through L IN signal communication, receiving and feeding back the status signal of the electronic oil pump, and adding a high-performance sealing device at the interface position of the housing, preferably, a wire harness with oil resistance and high temperature resistance can be adopted to lead the wire harness to the liquid surface along the inner housing of the transmission case and then penetrate out of the housing.

Specifically, the oil pump motor controller CAN respond to the target rotating speed instruction of the HCU and feed back the detected state signal of the electric oil pump integrated system, such as the feedback of the oil temperature of the gearbox, the operating state of the oil pump motor, the real-time rotating speed of the oil pump motor, the temperature of the controller chip and the like, so that the HCU CAN take the actual oil temperature of the gearbox fed back by the HCU as the control basis of the cooling system and/or take the state of the oil pump motor, the real-time rotating speed, the temperature signal of the chip and the like fed back by the HCU as the basis of fault diagnosis and problem troubleshooting

In a possible implementation manner of this embodiment, the electric oil pump integrated system of this embodiment further includes a thermistor 107 welded outside the oil pump motor controller 104, as shown in fig. 1, the pump motor controller 104 can use the thermistor 107 to collect the ambient oil temperature of the electric oil pump.

In this implementation, the MCPC collects the ambient oil temperature through the thermistor welded outside the casing, and feeds back the ambient oil temperature to the HCU, so that the HCU calculates the heat that the motor needs to take away according to this oil temperature signal, in combination with the intention of the driver, the power battery storage capacity, the driving motor temperature, the heating condition, and the like, and further converts the heat into a cooling flow Q, and then calculates a target rotation speed value according to the cooling flow Q, and sends an instruction carrying the target rotation speed value to the MCPC to be executed, and the specific calculation formula is as follows:

wherein Q represents the cooling flow rate in m L, Q represents the displacement of the electric oil pump in cc/rev, and n represents the target rotation speed in r/min.

Therefore, the electric oil pump system provided by the embodiment can play a powerful temperature protection role in the driving motor of the hybrid new energy automobile, prolongs the service life of the motor and the whole automobile, reduces the demagnetization risk of the driving motor caused by overhigh temperature, and can be popularized and applied to the P2\ P3 type hybrid electric automobile.

It should be noted that, in this embodiment, after the oil pump motor controller is integrated into the electric oil pump system, in order to ensure that the electric oil pump system can operate for a long time (2000 h under severe limit condition) as a cooling oil pump of a driving motor in a transmission, in a frequent change condition of the ambient oil temperature T0-T1 ℃ (-30-145 ℃), on the one hand, the minimum limit temperature T is set_minA maximum limit temperature T of minus 30 DEG C_max(145 deg.C) when the electric oil pump system is below the minimum limit temperature T deg.C_minAt a temperature of-30 ℃ or above the maximum limit temperature T_maxWhen the temperature is at 145 ℃, overtemperature alarm and power-off self-protection are carried out; and on the other hand, the strict service life calculation is carried out on the most temperature-sensitive electronic component, namely the electrolytic capacitor, the ripple current of the electrolytic capacitor is tested according to the peak working current of the system, the service life of the element is calculated, and the element is ensured to be reasonably selected.

It should be further noted that, as shown in fig. 4, in the structure of the existing oil pump motor controller, an O-ring is installed between an upper cover and a lower cover of the oil pump motor controller, and the upper cover and the lower cover are tightly pressed by a fastening screw, so that an external medium is prevented from entering the controller and damaging electronic components; the PIN needle of the connector, the metal positioning column and the sensor PIN all belong to the combination of metal materials and plastic materials, the injection molding material of PA66+ 30% GF is adopted, the production process requires that the metal PIN needle and the plastic are firstly molded into a whole, and then the metal PIN needle and the plastic are secondarily molded into the lower cover plastic shell.

However, fine gaps still exist at injection molding positions of the PIN needle and the positioning column in the structure, and the oil leakage problem can occur after the soaking time of more than 48 hours.

Based on this, an optional implementation manner is that in this embodiment, a heat conduction groove is added between an upper cover and a lower cover of an oil pump motor controller, epoxy silicone rubber is further added at a joint of a PIN needle and an injection molding material of an electric oil pump integrated system, and a material used during first injection molding of the PIN needle and the oil pump motor controller housing is PA6, and a material used during second injection molding is PA 66.

In the implementation mode, the problem that fine gaps exist at injection molding positions of the PIN needle and the positioning column due to the fact that materials of primary injection molding and secondary injection molding are the same, and PA66-GF30 and PA66-GF30 cannot be fused tightly is solved. A heat conduction groove is additionally arranged between an upper cover and a lower cover of an electronic element MCPC which is most sensitive to oil compatibility, epoxy silica gel is further additionally dispensed at the joint of a PIN needle and an injection molding material of an electric oil pump integrated system, for example, as shown in fig. 5, the sealing of an O-shaped sealing ring between the upper cover and the lower cover of an existing oil pump motor (as shown in fig. 5(1) is changed into sealing of a sealant (as shown in fig. 5 (2)), and meanwhile, the structure of a sealing groove of the upper cover and the lower cover is optimized, namely, the structure of the sealing groove shown in fig. 5(3) is changed into the structure of the sealing groove shown in fig. 5 (4)). And moreover, the material for the first injection molding is adjusted to be PA6-GF30, the material for the second injection molding is PA66-GF30, the PA6-GF30 is lower than the PA66-GF30 in melting point (the melting point of the PA is 222 ℃ and the melting point of the PA is 263 ℃ below zero) so that the PA and the GF can be well fused, and meanwhile, the temperature resistance of the PA and the GF is similar, so that the problem of oil leakage is solved skillfully, and the sealing performance of the insert on the shell is improved.

IN summary, the hybrid transmission case driving motor cooling electric oil pump system provided by the embodiment comprises a suction filter, an oil pump motor and an oil pump motor controller, wherein the suction filter is used for sucking oil at the bottom of the hybrid transmission case, the oil pump is used for pumping out the oil sucked by the suction filter, the oil pump motor is used for providing rotating speed and torque for the oil pump, the oil pump motor controller is electrically connected with the oil pump motor and provides power for the oil pump motor, meanwhile, the oil pump motor controller is also IN communication connection with a vehicle driving motor controller HCU through L IN signals, collected state signals of an electric oil pump integrated system are fed back to the HCU, and according to control instructions of the HCU, the electric oil pump is controlled to be IN a working condition that the ambient oil temperature is-30 ℃ to 145 ℃, the oil is continuously and stably provided for the hybrid transmission case by taking the oil as a cooling medium, therefore, the embodiment of the application integrates the oil pump motor controller into the electric oil pump system, controls the electric oil pump system to continuously and stably provide the cooling oil pump for the hybrid transmission case, compared with the existing working condition that the CAN control software is developed, the working cost of the CAN is greatly reduced, and the cost of the control of the vehicle electric oil pump is greatly reduced by the CAN software.

Second embodiment

Referring to fig. 6, a flow chart of a method for controlling a hybrid transmission drive motor cooling electric oil pump system according to the present embodiment is schematically shown, and the method includes the following steps:

s601: and acquiring the ambient oil temperature of the electric oil pump.

In this embodiment, in order to expand the normal operating temperature range of the electric oil pump and achieve a long-term continuous and stable supply of the cooling medium to the hybrid transmission under the premise of low cost, first, the oil pump motor controller may obtain the ambient oil temperature at which the electric oil pump is located, which is defined as T0, and then send the temperature to the HCU, so that the HCU calculates the target cooling flow Q according to the oil temperature, and then calculates the target rotation speed of the electric oil pump system by using the above formula (1).

S602: and judging whether the ambient oil temperature meets a preset temperature threshold range.

In this embodiment, after obtaining the ambient oil temperature T0 at which the electric oil pump is located through step S601, the oil pump motor controller may further determine whether T0 meets a preset temperature threshold range, where the preset temperature threshold range refers to a normal operating temperature range of the electric oil pump system; for example, it may be set to-30 ℃ to 145 ℃ to determine whether the electric oil pump system can normally operate, and if it is determined that T0 satisfies the preset temperature threshold range, step S603 may be continuously performed, whereas if it is determined that T0 does not satisfy the preset temperature threshold range, step S604 may be continuously performed.

S603: and if the environmental oil temperature is judged to meet the preset temperature threshold range, controlling the electric oil pump to continuously and stably supply the oil as a cooling medium to the hybrid gearbox.

In this embodiment, if the oil pump motor controller determines that the ambient oil temperature satisfies the preset temperature threshold range through step S602, the oil pump motor controller may control the electric oil pump to perform open-loop or closed-loop control in response to the command sent by the HCU, and adjust corresponding parameters in the electric oil pump, so as to continuously and stably provide the oil as a cooling medium to the hybrid transmission.

S604: and if the environment oil temperature is judged not to meet the preset temperature threshold range, controlling the electric oil pump to be powered off and stop working, and realizing self-protection of the electric oil pump.

In a possible implementation manner of this embodiment, the preset temperature threshold range is a first temperature threshold range, specifically, optionally, the first temperature threshold range is 5 ℃ to 145 ℃, wherein the boundary values 5 ℃ and 145 ℃ are not included.

Then, after determining that the ambient oil temperature satisfies the preset temperature threshold range, controlling the electric oil pump to use the oil as a cooling medium, and continuously and stably supplying the oil to the hybrid transmission may include the following steps a1-a 4:

and A1, determining the target rotating speed of the electric oil pump according to the ambient oil temperature.

In this implementation manner, if it is determined that the ambient oil temperature satisfies the preset temperature threshold range, that is, when the ambient oil temperature satisfies 5 ℃ < T0<145 ℃, the target rotation speed n of the electric oil pump may be determined according to the ambient oil temperature T0 by using the above formula (1).

And step A2, determining the three-phase current duty ratio output by the electric oil pump according to the target rotating speed.

After the target rotating speed n of the electric oil pump is determined through the step A1, the duty ratio of the output three-phase current can be adjusted according to the target rotating speed n, and is defined as D₀。

Step A3, calculating the actual rotating speed of the electric oil pump according to the induced electromotive force of the motor, and defining the actual rotating speed as n₀。

Step A4, according to the actual rotating speed n₀Regulating the three-phase current duty ratio D in combination with the target rotating speed n₀The actual rotating speed approaches to the rotating speed value determined according to the target rotating speed changed in real time, so that closed-loop control is realized, normal work of the electric oil pump system is guaranteed, and oil is continuously and stably supplied to the hybrid gearbox.

In a possible implementation manner of this embodiment, the preset temperature threshold range is the second temperature threshold range, specifically, optionally, the second temperature threshold range is-5 ℃ to 5 ℃, wherein the boundary value-5 ℃ is not included, and the boundary value 5 ℃ is included.

Then, after determining that the ambient oil temperature satisfies the preset temperature threshold range, controlling the electric oil pump to use the oil as a cooling medium, and continuously and stably supplying the oil to the hybrid transmission may include the following steps B1-B2:

and step B1, determining the target rotating speed of the electric oil pump according to the ambient oil temperature.

It should be noted that, in the step B1, the same as the step a1, except that T0 satisfies-5 ℃ < T0 ≦ 5 ℃, please refer to the description of the step a1, and the description thereof is omitted here.

And step B2, determining the lowest stable rotating speed of the closed-loop control of the electric oil pump according to the target rotating speed, and realizing the closed-loop control according to the lowest stable rotating speed so as to continuously and stably provide the oil liquid for the hybrid gearbox.

After the target rotating speed n of the electric oil pump is determined through the step B1, the lowest stable rotating speed of the electric oil pump in closed-loop control can be determined according to the target rotating speed n, closed-loop control is achieved according to the lowest stable rotating speed, and normal work of the electric oil pump system is guaranteed, so that oil is continuously and stably supplied to the hybrid transmission case.

In one possible implementation of this embodiment, the preset temperature threshold range is a third temperature threshold range, specifically, optionally, the third temperature threshold range is-30 ℃ to-5 ℃, wherein the boundary values of-30 ℃ and-5 ℃ are included.

Then, after determining that the ambient oil temperature satisfies the preset temperature threshold range, controlling the electric oil pump to use the oil as a cooling medium, and continuously and stably supplying the oil to the hybrid transmission may include the following steps C1-C2:

and step C1, determining the constant current of the electric oil pump according to the ambient oil temperature.

In this implementation manner, if it is determined that the ambient oil temperature satisfies the preset temperature threshold range, that is, when it is determined that T0 is greater than or equal to-30 ℃ and less than or equal to 5 ℃, at this time, the target rotation speed n of the electric oil pump is not calculated any more, but a constant current for normal operation of the electric oil pump system is determined according to the ambient oil temperature T0, it should be noted that a value of the constant current may be determined according to practical experience, for example, may be 6A or 7A, which is not limited in the embodiment of the present application.

And step C2, starting the electric oil pump to realize open-loop control according to the constant current so as to continuously and stably supply the oil to the hybrid gearbox.

After the constant current of the electric oil pump is determined through the step C1, at this time, the electric oil pump is not controlled to work through the rotating speed, but the electric oil pump is started only with the constant current to realize open-loop control, so that the normal work of the electric oil pump system is ensured, and the oil is continuously and stably supplied to the hybrid transmission case.

It should be noted that, in the working condition of each preset temperature threshold range, a corresponding temperature window is set, for example, the temperature window may be set to 5 ℃, and specific values are also determined according to empirical values, so that when the ambient temperature changes, the electric oil pump is not caused to frequently change the working state at the critical value of each preset temperature threshold range, and the electric oil pump is not damaged.

For example, the following steps are carried out: the temperature window set was assumed to be 5 ℃. When the oil temperature at the inlet of the oil pump motor is-30 ℃ during starting, the oil temperature is in a third temperature threshold range (-30 ℃ to T0 is less than or equal to 5 ℃), correspondingly, the oil pump motor is in an open-loop control state, the oil temperature is increased along with the heating of parts such as the motor and the like, when the oil temperature is increased to-5 ℃, the third temperature threshold range (-30 ℃ to T0 is less than or equal to 5 ℃) is changed into a second temperature threshold range (-5 ℃ to T0 is less than or equal to 5 ℃), correspondingly, the motor also needs to enter minimum stable rotating speed closed-loop control, at this time, if the oil temperature is reduced, in order to ensure the stability of the working state of the electric oil pump, the working state cannot be changed immediately, but the oil temperature needs to be continuously waited for reduction, and the motor can enter open-loop control until the oil temperature is reduced; conversely, if the oil temperature rises to 5 ℃, the motor responds to HCU speed control, at which time if the oil temperature falls, the motor enters the lowest stable speed of closed-loop control when it falls to 0 ℃.

Like this, through the real time monitoring to the environment oil temperature, can provide continuous stable coolant for P2 type hybrid transmission to, through carrying out open-loop control to the motor at low temperature, satisfy the motor demand of low discharge at low temperature, saved the position sensor of oil pump motor, reduce components and parts cost.

In summary, in the control method of the hybrid transmission driving motor cooling electric oil pump system provided by the embodiment, the oil pump motor controller is integrated in the electric oil pump system, the oil pump motor controller firstly obtains the environmental oil temperature of the electric oil pump, then, whether the environmental oil temperature meets a preset temperature threshold range is judged, if yes, the electric oil pump is controlled to continuously and stably supply the oil serving as a cooling medium to the hybrid gearbox, and if not, the electric oil pump is controlled to be powered off and stop working, and it can be seen that the oil pump motor controller in the embodiment of the present application can provide a continuous and stable cooling medium for the P2 type hybrid transmission through real-time monitoring of the ambient oil temperature, and, the motor is subjected to open-loop control at low temperature, so that the requirement of the motor for low flow at low temperature is met, a position sensor of an oil pump motor is omitted, and the cost of components is reduced.

For the sake of understanding, an overall implementation schematic diagram of a hybrid transmission drive motor cooling electric oil pump system control method is shown in fig. 7. The implementation process of the control method for the hybrid transmission driving motor cooling electric oil pump system provided by the embodiment of the application is introduced.

As shown in fig. 7, the implementation process of the embodiment of the present application is as follows: firstly, an oil pump motor controller obtains the environmental oil temperature of an electric oil pump, then, whether the environmental oil temperature meets a preset temperature threshold range (-30 ℃ < T0<145 ℃) is judged, if the environmental oil temperature meets the preset temperature threshold range, the environmental oil temperature is further judged to meet the threshold range of 5 ℃ < T0<145 ℃ "," -5 ℃ < T0 ≤ 5 ℃ "," -30 ℃ ≤ T0 ≤ 5 ℃ ", and then different motor control processes can be correspondingly realized according to the judgment result, namely according to different threshold ranges, so that oil can be used as a cooling medium and continuously and stably supplied to a hybrid transmission; however, if the ambient oil temperature is judged not to meet the preset temperature threshold range (T0< -30 ℃ or T0>145 ℃), the electric oil pump can be controlled to be powered off and stop working to realize self-protection, and the specific implementation process is shown in step S601-step S604.

As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network communication device such as a media gateway, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present application.

It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.