Hydraulic control method and hydraulic control device for a hybrid transmission

Abstract

The application discloses a hydraulic control method and device of a hybrid transmission. The method comprises the following steps: determining a vehicle operation mode of a target vehicle in a target period; determining an output flow of a mechanical oil pump of the target vehicle and an actual demand flow when the vehicle operation mode is a non-pure electric mode; obtaining an oil temperature of oil liquid of the target vehicle in the target period, and a maximum load of a low-pressure oil circuit of the target vehicle, and determining a maximum allowable flow of the oil liquid at the oil temperature and under the maximum load; and determining an operation state of an electronic oil pump based on a mathematical relationship between at least one element of the maximum allowable flow and the actual demand flow and the output flow, so as to adjust the hydraulic pressure of the hybrid transmission. The application solves the technical problems of great design difficulty, high cost and large occupied volume caused by the method of adjusting the hydraulic pressure by setting a one-way valve in the related art.

Description

Technical Field

[0001] This application relates to the field of hydraulic control of hybrid transmissions, and more specifically, to a hydraulic control method and hydraulic control device for a hybrid transmission. Background Technology

[0002] Dual-motor hybrid transmissions, as a mainstream hybrid technology, typically use a single clutch to disconnect or transmit engine torque. For multi-speed hybrid transmissions, the hydraulic system generally uses a coupled power source consisting of an electronic oil pump and a mechanical oil pump. The output is then regulated and distributed by the hydraulic system to various components or actuators. To prevent interference between the hydraulic system's oil sources and to limit the pressure in the high-pressure and low-pressure circuits, check valves are typically added at the outlets of both the electronic and mechanical oil pumps, and pressure relief valves are added to both the high-pressure and low-pressure circuits. However, adding check valves increases cost and layout complexity. The lack of a relief valve in the low-pressure circuit results in very high pressure, requiring downstream components and piping to be designed with high strength, leading to significant design redundancy, higher costs, and larger size.

[0003] There is currently no effective solution to the above problems. Summary of the Invention

[0004] This application provides a hydraulic control method and hydraulic control device for a hybrid transmission, which at least solves the technical problems of high design difficulty, high cost and large volume caused by adjusting hydraulic pressure by setting a one-way valve in the related art.

[0005] According to one aspect of the embodiments of this application, a hydraulic control method for a hybrid transmission is provided. The hybrid transmission includes at least an electronic oil pump, comprising: determining the vehicle operating mode of a target vehicle during a target time period; determining the output flow rate and actual demand flow rate of the mechanical oil pump of the target vehicle when the vehicle operating mode is non-pure electric mode; acquiring the oil temperature of the target vehicle and the maximum load of the low-pressure oil circuit of the target vehicle during the target time period, and determining the maximum allowable flow rate of the oil at the oil temperature and the maximum load; and determining the operating state of the electronic oil pump based on at least one element of the maximum allowable flow rate and the actual demand flow rate, and the mathematical relationship between the output flow rate, so as to adjust the hydraulic pressure of the hybrid transmission.

[0006] Optionally, the operating state of the electronic oil pump is determined based on the mathematical relationship between at least one of the maximum allowable flow rate and the actual demand flow rate and the output flow rate, including: when the output flow rate is greater than the maximum allowable flow rate, generating a first control command based on the first difference flow rate between the maximum allowable flow rate and the output flow rate, sending the first control command value to the electronic oil pump, and controlling the electronic oil pump to rotate in a counterclockwise direction to draw in the first difference flow rate through the oil suction path of the electronic oil pump.

[0007] Optionally, after controlling the electronic oil pump to rotate counterclockwise, the method further includes: detecting the load of the low-pressure oil circuit of the target vehicle until the load is less than the maximum load, then controlling the electronic oil pump to stop rotating.

[0008] Optionally, the operating state of the electronic oil pump is determined based on the mathematical relationship between the output flow rate and at least one of the maximum allowable flow rate and the actual demand flow rate, including: when the output flow rate is less than the maximum allowable flow rate but greater than the actual demand flow rate, sending a second control command to the electronic oil pump to control the electronic oil pump to stop rotating.

[0009] Optionally, the operating state of the electronic oil pump is determined based on the mathematical relationship between the maximum allowable flow rate and the actual demand flow rate and the output flow rate, including: when the output flow rate is less than the actual demand flow rate, generating a third control command based on the second difference flow rate between the actual demand flow rate and the output flow rate, sending the third control command to the electronic oil pump, and controlling the electronic oil pump to rotate clockwise so as to output the second difference flow rate to the hybrid transmission through the oil outlet path of the electronic oil pump.

[0010] Optionally, the non-pure electric mode includes one of the following: hybrid mode and direct drive mode, wherein in hybrid mode, the target vehicle's engine generates electricity and the drive motor drives the vehicle, and in direct drive mode, the engine directly drives the vehicle.

[0011] Optionally, the method further includes: when the vehicle is in pure electric mode, determining the actual demand flow of the target vehicle in pure electric mode during the target time period; when the actual demand flow is less than the preset maximum demand flow, generating a fourth control command based on the actual demand flow, sending the fourth control command to the electronic oil pump, controlling the electronic oil pump to rotate clockwise, so as to output the actual demand flow to the hybrid transmission through the oil outlet of the electronic oil pump.

[0012] According to another aspect of the embodiments of this application, a hydraulic control device for a hybrid transmission is also provided. The hybrid transmission includes at least an electronic oil pump, comprising: a first determining module for determining the vehicle operating mode of the target vehicle during a target time period; a second determining module for determining the output flow rate and actual demand flow rate of the mechanical oil pump of the target vehicle when the vehicle operating mode is non-pure electric mode; an acquiring module for acquiring the oil temperature of the target vehicle and the maximum load of the low-pressure oil circuit of the target vehicle during the target time period, and determining the maximum allowable flow rate of the oil at the oil temperature and the maximum load; and a third determining module for determining the operating state of the electronic oil pump based on at least one element of the maximum allowable flow rate and the actual demand flow rate, and the mathematical relationship between the output flow rate, so as to adjust the hydraulic pressure of the hybrid transmission.

[0013] According to another aspect of the embodiments of this application, a non-volatile storage medium is also provided, the storage medium including a stored program, wherein, when the program is running, it controls the device where the storage medium is located to execute any hydraulic control method of a hybrid transmission.

[0014] According to another aspect of the embodiments of this application, an electronic device is also provided, including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to execute instructions to implement a hydraulic control method for any hybrid transmission.

[0015] In this embodiment, a flow regulation method based on an electronic oil pump is adopted. This involves determining the vehicle's operating mode during a target time period; determining the output flow rate and actual required flow rate of the mechanical oil pump when the vehicle is in a non-pure electric mode; obtaining the oil temperature and maximum load of the low-pressure oil circuit during the target time period; and determining the maximum allowable flow rate of the oil at that temperature and under the maximum load. Based on at least one element of the maximum allowable flow rate and the actual required flow rate, and the mathematical relationship between these elements and the output flow rate, the operating state of the electronic oil pump is determined to adjust the hydraulic pressure of the hybrid transmission. This achieves the goal of adjusting the flow rate within the hybrid transmission pipeline based on the forward and reverse rotation of the electronic oil pump, thereby adjusting the hydraulic pressure of the hybrid transmission. This achieves precise control of the oil circuit pressure, reduces system power consumption and system cost, and solves the technical problems of high design difficulty, high cost, and large volume occupation caused by the method of adjusting hydraulic pressure based on setting a one-way valve in related technologies. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 This is a schematic flowchart of an optional hydraulic control method for a hybrid transmission according to an embodiment of this application;

[0018] Figure 2 This is a physical structural diagram of the hydraulic control device of the hybrid transmission in the embodiments of this application;

[0019] Figure 3 This is a schematic flowchart of a hydraulic control method for a hybrid transmission in one embodiment of this application;

[0020] Figure 4 This is a schematic diagram of the structure of an optional hydraulic control device for a hybrid transmission according to an embodiment of this application. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0022] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0023] According to an embodiment of this application, an embodiment of a hydraulic control method for a hybrid transmission is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0024] Figure 1 This application describes a hydraulic control method for a hybrid transmission, which includes at least an electronic oil pump, such as... Figure 1 As shown, the method includes the following steps:

[0025] Step S102: Determine the vehicle operation mode of the target vehicle within the target time period;

[0026] Step S104: Determine the output flow rate and actual required flow rate of the mechanical oil pump of the target vehicle when the vehicle is in non-pure electric mode.

[0027] Step S106: Obtain the oil temperature of the target vehicle during the target time period, as well as the maximum load of the low-pressure oil circuit of the target vehicle, and determine the maximum allowable flow rate of the oil at the oil temperature and at the maximum load.

[0028] Step S108: Based on at least one of the maximum allowable flow rate and the actual required flow rate, the mathematical relationship between the output flow rate and the pump's operating state is determined to adjust the hydraulic pressure of the hybrid transmission.

[0029] This hydraulic control method employs flow regulation based on an electronic oil pump. It determines the vehicle's operating mode during a target time period; identifies the output flow and actual demand flow of the mechanical oil pump when the vehicle is in a non-pure electric mode; acquires the oil temperature and maximum load of the low-pressure oil circuit during the target time period; and determines the maximum allowable flow rate at that temperature and maximum load. Based on the mathematical relationship between at least one element of the maximum allowable flow rate and the actual demand flow rate and the output flow rate, the operating state of the electronic oil pump is determined to adjust the hydraulic pressure of the hybrid transmission. This achieves the goal of adjusting the flow rate within the hybrid transmission's pipelines by rotating the electronic oil pump in both directions, thereby adjusting the hybrid transmission's hydraulic pressure. This results in precise control of the oil circuit pressure, reduced system power consumption and cost, and solves the technical problems of high design difficulty, high cost, and large volume occupation caused by adjusting hydraulic pressure using a one-way valve in related technologies.

[0030] To avoid excessive pressure in the hybrid transmission oil circuit, as an optional implementation method, the operating state of the electronic oil pump is determined based on the mathematical relationship between at least one of the maximum allowable flow rate and the actual required flow rate and the output flow rate. This can be achieved as follows: when the output flow rate is greater than the maximum allowable flow rate, a first control command is generated based on the first difference between the maximum allowable flow rate and the output flow rate. The first control command value is sent to the electronic oil pump to control it to rotate counterclockwise so as to draw in the first difference flow rate through the suction circuit of the electronic oil pump.

[0031] As an optional implementation, in order to ensure the accuracy of adjustment and avoid over-adjustment, after controlling the electronic oil pump to rotate counterclockwise, the load of the low-pressure oil circuit of the target vehicle can be detected by a sensor until the load is less than the maximum load, then the electronic oil pump is controlled to stop rotating.

[0032] As another optional implementation, the operating state of the electronic oil pump is determined based on the mathematical relationship between at least one of the maximum allowable flow rate and the actual demand flow rate and the output flow rate. It can also be used to send a second control command to the electronic oil pump to control the electronic oil pump to stop rotating when the output flow rate is less than the maximum allowable flow rate but greater than the actual demand flow rate.

[0033] As another optional implementation, the operating state of the electronic oil pump is determined based on the mathematical relationship between at least one of the maximum allowable flow rate and the actual demand flow rate and the output flow rate. In the case where the output flow rate is less than the actual demand flow rate, a third control command is generated based on the second difference flow rate between the actual demand flow rate and the output flow rate, and the third control command is sent to the electronic oil pump to control the electronic oil pump to rotate in a clockwise direction so as to output the second difference flow rate to the hybrid transmission through the oil outlet of the electronic oil pump.

[0034] It should be noted that the above-mentioned non-pure electric modes include, but are not limited to: hybrid mode and direct drive mode. In hybrid mode, the target vehicle's engine generates electricity, and the drive motor drives the vehicle. In direct drive mode, the engine directly drives the vehicle.

[0035] In some embodiments of this application, when the vehicle is in pure electric mode, the actual demand flow of the target vehicle is determined during the target time period when the target vehicle is in pure electric mode; if the actual demand flow is less than the preset maximum demand flow, a fourth control command is generated based on the actual demand flow, and the fourth control command is sent to the electronic oil pump to control the electronic oil pump to rotate clockwise so as to output the actual demand flow to the hybrid transmission through the oil outlet of the electronic oil pump.

[0036] Figure 2 This is a structural diagram of the hydraulic control device 100 of the hybrid transmission in the embodiments of this application, as shown below. Figure 2 As shown, the hydraulic control device includes: oil tank 01, suction filter 02, electronic oil pump 03, mechanical oil pump 04, main oil pressure regulating pilot solenoid valve 05, main oil pressure regulating slide valve 06, high pressure unloading valve 07, actuator (module) 08, cooler 09, filter press 10, flow distribution mechanism (module) 11, electronic oil pump (EOP) inlet oil circuit 101, electronic oil pump outlet oil circuit 102, mechanical oil pump outlet oil circuit 103, cooling oil circuit 104, and oil temperature sensor 110.

[0037] In this embodiment, the hybrid transmission has three basic operating modes: First, pure electric mode: the drive motor drives the vehicle, and only the electronic oil pump works. Second, hybrid mode: the engine generates electricity, the drive motor drives the vehicle, the mechanical oil pump works, and the electronic oil pump can be selected to work or not. Third, direct drive mode: the engine drives the vehicle, the mechanical oil pump works, and the electronic oil pump can be selected to work or not.

[0038] When designing a hybrid transmission, the low-pressure oil circuit load is designed based on Ps, meaning the load range is 0 to Ps. The maximum allowable flow rate at different oil temperatures corresponding to Ps is Qsi. The maximum flow rate requirement of the hybrid system under different modes and oil temperatures is Qmi, and the corresponding low-pressure oil circuit load is Pmi, where Qmi < Qsi and Pmi < Ps. During actual vehicle operation, the actual required flow rate is Qa, corresponding to a load of Pa, where Qa ≤ Qmi and Pa ≤ Pmi. It's important to note that Ps represents the maximum load of the low-pressure oil circuit. Because the low-pressure oil circuit load is affected by oil temperature and output flow rate, in pure electric mode, only the electronic oil pump operates, and its speed is precisely controlled according to flow rate requirements. In this case, the low-pressure oil circuit load is Pa.

[0039] When in hybrid or direct drive mode, the mechanical oil pump operates, and its speed is not decoupled from the engine speed. When the engine speed is high and the oil temperature is low, the output flow rate of the mechanical oil pump, Qme, is greater than Qsi. At this time, the load on the low-pressure oil circuit is greater than Ps. In this embodiment, by changing the rotation direction of the electronic oil pump 03, the excess oil output by the mechanical oil pump can be drawn from the oil outlet 102 of the electronic oil pump and then discharged to the suction circuit 101, thereby reducing the load on the low-pressure oil circuit to below Ps and ensuring system safety.

[0040] Figure 3 This is a schematic flowchart of a hydraulic control method for a hybrid transmission in one embodiment of this application, as shown below. Figure 3 As shown, the process includes: obtaining the current vehicle mode and the required flow rate for cooling and lubrication at the current oil temperature; then, determining whether the vehicle is in EV (pure electric mode). In pure electric mode, the engine is not running, only the electronic oil pump is operating. The required flow rate calculation module receives external signals and calculates the current actual required flow rate Qa. Qa is compared with the preset maximum required flow rate Qmi for the current oil temperature. If Qa ≤ Qmi, Qa is sent as a flow rate input command to the EOP, and the EOP operates in direction 1. It should be noted that Qmi was calibrated in the early stages of development and can be obtained from a lookup table in the input control module. Specifically, the EOP operates in direction 1. At this time, 101 is the EOP's oil suction path, and 102 is the EOP's oil outlet path. Oil flows from the oil tank 01 through the oil suction filter 02 and the electronic oil pump 03 to the electronic oil pump outlet oil path 102, then through the cooler 09 and the pressure filter 10 to the flow distribution module 11, and is then distributed to various parts of the hybrid transmission. At this time, the low-pressure oil circuit load is Pa.

[0041] When in hybrid mode or direct drive mode: the mechanical oil pump works, and the speed of the mechanical oil pump is not decoupled from the engine speed. When the engine speed is high and the oil temperature is low, the output flow of the mechanical oil pump Qme > Qsi. (Qsi-Qme) is sent as the flow input command to EOP. EOP rotates in direction 2. Specifically, EOP rotates in direction 2. At this time, 102 is the oil suction path of EOP and 101 is the oil discharge path of EOP. The mechanical oil pump outputs oil from the oil tank 01 through the oil suction filter 02 to the mechanical oil pump outlet oil circuit 103. Part of the oil passes through the cooler 09 and the filter press 10 to the flow distribution module 11, and after distribution, it is input to various parts of the hybrid transmission. Another part of the oil is output from the 102 oil circuit to the 101 oil outlet circuit by the EOP. At this time, the load of the low-pressure oil circuit is kept below Ps to ensure the safety of the low-pressure oil circuit. The relationship between the output flow rate Qme of the mechanical oil pump and the oil temperature Ta, and the relationship between the maximum allowable flow rate Qsi and the oil temperature Ta have been calibrated during development and can be obtained by looking up the table.

[0042] Figure 4 This application discloses a hydraulic control device for a hybrid transmission, wherein the hybrid transmission includes at least an electronic oil pump, such as... Figure 4 As shown, the hydraulic control device includes:

[0043] The first determining module 40 is used to determine the vehicle operation mode of the target vehicle within the target time period;

[0044] The second determining module 42 is used to determine the output flow rate and actual required flow rate of the mechanical oil pump of the target vehicle when the vehicle is in non-pure electric mode.

[0045] The acquisition module 44 is used to acquire the oil temperature of the target vehicle during the target time period, as well as the maximum load of the low-pressure oil circuit of the target vehicle, and to determine the maximum allowable flow rate of the oil at the oil temperature and at the maximum load.

[0046] The third determining module 46 is used to determine the operating state of the electronic oil pump based on at least one of the maximum allowable flow rate and the actual demand flow rate, and the mathematical relationship between the output flow rate, so as to adjust the hydraulic pressure of the hybrid transmission.

[0047] In this hydraulic control device, the first determining module 40 is used to determine the vehicle operating mode of the target vehicle during the target time period; the second determining module 42 is used to determine the output flow rate and actual demand flow rate of the mechanical oil pump of the target vehicle when the vehicle operating mode is non-pure electric mode; the acquiring module 44 is used to acquire the oil temperature of the target vehicle and the maximum load of the low-pressure oil circuit of the target vehicle during the target time period, and determine the maximum allowable flow rate of the oil at the oil temperature and the maximum load; the third determining module 46 is used to determine the operating state of the electronic oil pump based on the mathematical relationship between at least one element of the maximum allowable flow rate and the actual demand flow rate and the output flow rate, so as to adjust the hydraulic pressure of the hybrid transmission. This achieves the purpose of adjusting the flow rate in the hybrid transmission pipeline based on the forward and reverse rotation of the electronic oil pump, thereby achieving the technical effect of accurately controlling the pressure of the oil circuit, reducing system power consumption and system cost, and solving the technical problems of high design difficulty, high cost and large volume caused by the method of adjusting hydraulic pressure by setting a one-way valve in related technologies.

[0048] According to another aspect of the embodiments of this application, a non-volatile storage medium is also provided, the storage medium including a stored program, wherein, when the program is running, it controls the device where the storage medium is located to execute any hydraulic control method of a hybrid transmission.

[0049] Specifically, the aforementioned storage medium is used to store program instructions for the following functions, thereby implementing the following functions:

[0050] Determine the vehicle operating mode of the target vehicle during the target time period; determine the output flow rate and actual demand flow rate of the mechanical oil pump of the target vehicle when the vehicle operating mode is non-pure electric mode; obtain the oil temperature of the target vehicle and the maximum load of the low-pressure oil circuit of the target vehicle during the target time period, and determine the maximum allowable flow rate of the oil at the oil temperature and at the maximum load; determine the operating state of the electronic oil pump based on the mathematical relationship between at least one element of the maximum allowable flow rate and the actual demand flow rate and the output flow rate, so as to adjust the hydraulic pressure of the hybrid transmission.

[0051] Optionally, in this embodiment, the storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or equipment, or any suitable combination of the foregoing. More specific examples of the storage medium include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0052] In an exemplary embodiment of this application, a computer program product is also provided, including a computer program that, when executed by a processor, implements the hydraulic control method for the hybrid transmission described above.

[0053] Optionally, when executed by a processor, the computer program may perform the following steps:

[0054] Determine the vehicle operating mode of the target vehicle during the target time period; determine the output flow rate and actual demand flow rate of the mechanical oil pump of the target vehicle when the vehicle operating mode is non-pure electric mode; obtain the oil temperature of the target vehicle and the maximum load of the low-pressure oil circuit of the target vehicle during the target time period, and determine the maximum allowable flow rate of the oil at the oil temperature and at the maximum load; determine the operating state of the electronic oil pump based on the mathematical relationship between at least one element of the maximum allowable flow rate and the actual demand flow rate and the output flow rate, so as to adjust the hydraulic pressure of the hybrid transmission.

[0055] An electronic device is provided according to an embodiment of the present application, the electronic device comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the hydraulic control method of the hybrid transmission described above.

[0056] Optionally, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0057] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0058] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0059] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0060] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0061] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0062] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0063] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A hydraulic control method for a hybrid transmission, characterized in that, The hybrid transmission includes at least: an electronic oil pump, including: Determine the vehicle operation mode of the target vehicle within the target time period; Determine the output flow rate and actual required flow rate of the mechanical oil pump of the target vehicle when the vehicle is operating in a non-pure electric mode. The oil temperature of the target vehicle during the target time period and the maximum load of the low-pressure oil circuit of the target vehicle are obtained, and the maximum allowable flow rate of the oil at the oil temperature and at the maximum load is determined. The operating state of the electronic oil pump is determined based on at least one element of the maximum allowable flow rate and the actual required flow rate, and the mathematical relationship between the output flow rate and the pump is used to adjust the hydraulic pressure of the hybrid transmission. Determining the operating state of the electronic oil pump based on the mathematical relationship between at least one of the maximum allowable flow rate and the actual required flow rate and the output flow rate includes: when the output flow rate is greater than the maximum allowable flow rate, generating a first control command based on a first difference flow rate between the maximum allowable flow rate and the output flow rate, sending the first control command to the electronic oil pump, and controlling the electronic oil pump to rotate counterclockwise so as to draw in the first difference flow rate through the oil suction path of the electronic oil pump.

2. The hydraulic control method according to claim 1, characterized in that, After controlling the electronic oil pump to rotate counterclockwise, the method further includes: The load on the low-pressure oil circuit of the target vehicle is detected, and the electronic oil pump is controlled to stop rotating when the load is less than the maximum load.

3. The hydraulic control method according to claim 1, characterized in that, The operating status of the electronic oil pump is determined based on a mathematical relationship between at least one of the maximum permissible flow rate and the actual required flow rate, and the output flow rate, including: If the output flow rate is less than the maximum allowable flow rate but greater than the actual required flow rate, a second control command is sent to the electronic oil pump to control the electronic oil pump to stop rotating.

4. The hydraulic control method according to claim 1, characterized in that, The operating status of the electronic oil pump is determined based on a mathematical relationship between at least one of the maximum permissible flow rate and the actual required flow rate, and the output flow rate, including: When the output flow rate is less than the actual demand flow rate, a third control command is generated based on the second difference flow rate between the actual demand flow rate and the output flow rate. The third control command is sent to the electronic oil pump to control the electronic oil pump to rotate clockwise so as to output the second difference flow rate to the hybrid transmission through the oil outlet of the electronic oil pump.

5. The hydraulic control method according to any one of claims 1 to 4, characterized in that, The non-pure electric mode includes one of the following: hybrid mode and direct drive mode, wherein the hybrid mode generates electricity from the engine of the target vehicle and drives the electric motor to drive the vehicle, and the direct drive mode directly drives the vehicle from the engine.

6. The hydraulic control method according to claim 1, characterized in that, The method further includes: When the vehicle is in pure electric mode, determine the actual demand flow of the target vehicle when the target vehicle is in pure electric mode during the target time period. If the actual demand flow is less than the preset maximum demand flow, a fourth control command is generated based on the actual demand flow and sent to the electronic oil pump to control the electronic oil pump to rotate clockwise so as to output the actual demand flow to the hybrid transmission through the oil outlet of the electronic oil pump.

7. A hydraulic control device for a hybrid transmission, characterized in that, A hydraulic control method for implementing a hybrid transmission as described in any one of claims 1 to 6, wherein the hybrid transmission comprises at least: an electronic oil pump, including: The first determining module is used to determine the vehicle operation mode of the target vehicle within the target time period; The second determining module is used to determine the output flow rate and actual required flow rate of the mechanical oil pump of the target vehicle when the vehicle is in a non-pure electric mode. The acquisition module is used to acquire the oil temperature of the target vehicle during the target time period, as well as the maximum load of the low-pressure oil circuit of the target vehicle, and to determine the maximum allowable flow rate of the oil at the oil temperature and at the maximum load. The third determining module is used to determine the operating state of the electronic oil pump based on at least one element of the maximum allowable flow rate and the actual required flow rate, and the mathematical relationship between the output flow rate, so as to adjust the hydraulic pressure of the hybrid transmission.

8. A non-volatile storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, the device containing the storage medium is controlled to perform the hydraulic control method of the hybrid transmission according to any one of claims 1 to 6.

9. An electronic device, characterized in that, include: processor; Memory used to store the processor's executable instructions; The processor is configured to execute the instructions to implement the hydraulic control method for the hybrid transmission as described in any one of claims 1 to 6.

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