Control method and device for clutch pressure compensation in hybrid transmission

Abstract

This application provides a control method and apparatus for clutch pressure compensation in a hybrid power transmission, relating to the field of clutch control technology. The method includes: determining that the vehicle is in a parallel hybrid power state; judging whether the vehicle can maintain the parallel hybrid power state based on the current state of the vehicle; if the vehicle maintains the parallel hybrid power state, judging the current driving state of the vehicle and the clutch state to calculate the clutch oil pressure request; performing clutch pressure compensation control based on the clutch oil pressure request; and performing clutch pressure compensation control based on the current driving state of the vehicle and the clutch state to avoid poor oil pump suction, ensure the stability of clutch control under different driving conditions, and protect the clutch.

Description

Technical Field

[0001] This application relates to the field of clutch control technology, and more specifically, to a control method and device for clutch pressure compensation in a hybrid power transmission. Background Technology

[0002] Hybrid transmissions (P1+P3 configuration) are a widely used hybrid power system, offering advantages such as reduced fuel consumption and enhanced power performance. By controlling the engagement of the clutch, the drive motor and engine work together to propel the vehicle, providing stronger power. Therefore, ensuring stable clutch control during torque transmission is crucial for drivability and safety. The hydraulic control system of a hybrid transmission includes a load pump, hydraulic throttle valve, pressure sensor, and the clutch as the controlled component. The pump controls the clutch oil pressure. Under conditions of bumps, cornering, acceleration, or braking, insufficient oil pump suction may occur, leading to a drop in clutch oil pressure, causing driver jerking and potentially posing a risk of clutch burnout. Summary of the Invention

[0003] The purpose of this application is to provide a control method and device for clutch pressure compensation in a hybrid transmission, in order to solve the problem that under certain driving conditions, existing vehicles may experience poor oil pump suction, resulting in a drop in clutch oil circuit pressure, causing driver jerking and the risk of clutch burning.

[0004] In a first aspect, embodiments of this application provide a control method for clutch pressure compensation in a hybrid power transmission, including:

[0005] Determine that the vehicle is in a parallel hybrid power configuration;

[0006] Based on the current state of the vehicle, determine whether the vehicle can maintain parallel hybrid power mode;

[0007] If the vehicle is in parallel hybrid mode, the current driving state of the vehicle and the clutch state are determined to calculate the clutch oil pressure request.

[0008] Clutch pressure compensation control is performed based on the clutch oil pressure request.

[0009] In the above implementation process, it is determined that the vehicle is in a parallel hybrid power state; based on the current state of the vehicle, it is determined whether the vehicle can maintain the parallel hybrid power state; if the vehicle maintains the parallel hybrid power state, the current driving state of the vehicle and the clutch state are determined to calculate the clutch oil pressure request; clutch pressure compensation control is performed based on the clutch oil pressure request; clutch pressure compensation control is performed based on the current driving state of the vehicle and the clutch state to avoid poor oil pump suction, ensure the stability of clutch control under different driving conditions, and protect the clutch.

[0010] Furthermore, determining whether the vehicle can maintain parallel hybrid power mode based on its current state includes:

[0011] The system determines whether the vehicle can maintain a parallel hybrid power state based on the hybrid power target state, load oil pump pressure build-up capability, and diagnostic results sent by the vehicle control unit (VCU).

[0012] In the above implementation process, based on different driving conditions of the vehicle, it is determined whether the vehicle can maintain a parallel hybrid power state in order to calculate the clutch oil pressure request.

[0013] Furthermore, the determination of the vehicle's current driving state and clutch state to calculate the clutch oil pressure request includes:

[0014] If the vehicle is currently turning, linear interpolation and table lookup are performed based on the magnitude of the lateral acceleration and the actual pressure of the clutch oil circuit to obtain the first clutch oil circuit pressure request value.

[0015] If the vehicle is currently accelerating or braking, linear interpolation and table lookup are performed based on the magnitude of longitudinal acceleration and the actual pressure of the clutch oil circuit to obtain the second clutch oil circuit pressure request value.

[0016] If the current clutch oil circuit pressure fluctuates and exceeds the set threshold, linear interpolation and table lookup are performed based on the magnitude and duration of the pressure fluctuation to obtain the third clutch oil circuit pressure request value.

[0017] The required oil pressure value for the fourth clutch is calculated based on engine torque, generator torque, and oil temperature.

[0018] In the above implementation process, the clutch oil pressure request is calculated based on the vehicle's driving conditions in order to compensate for the clutch pressure.

[0019] Furthermore, the clutch pressure compensation control based on the clutch oil circuit pressure request includes:

[0020] Obtain the maximum requested oil pressure value of the clutch;

[0021] The clutch oil circuit pressure arbitration module uses the maximum oil circuit pressure request value as the actual clutch oil circuit pressure request.

[0022] In the above implementation process, pressure compensation control is performed on the clutch to avoid poor oil pump suction, ensure the stability of clutch control under different driving conditions, and protect the clutch.

[0023] Furthermore, after performing clutch pressure compensation control based on the clutch oil pressure request, the method further includes:

[0024] When a command to exit parallel hybrid mode is received from the VCU, the clutch is released to exit the parallel hybrid mode.

[0025] In the above implementation process, if it is necessary to exit the parallel operation state, the clutch is released to ensure safety.

[0026] Furthermore, after performing clutch pressure compensation control based on the clutch oil pressure request, the method further includes:

[0027] When the vehicle is in its first driving condition, the oil pump's oil suction capacity weakens. This increases the time window for obtaining the clutch oil pressure request and increases the clutch oil pressure differential in order to diagnose the fault.

[0028] During the above implementation process, when the vehicle is under relatively intense driving conditions, the oil pump's oil suction capacity weakens, and a longer time window and clutch oil circuit pressure difference need to be set for diagnosing leakage faults.

[0029] Furthermore, after determining whether the vehicle can maintain parallel hybrid power mode based on its current state, the process also includes:

[0030] If the vehicle cannot maintain the parallel hybrid power mode, then control the vehicle to exit the parallel hybrid power mode.

[0031] In the above implementation process, if the vehicles cannot maintain the parallel state, they will exit the state without the need for pressure compensation control of the clutch.

[0032] Secondly, embodiments of this application provide a control device for compensating the clutch pressure of a hybrid power transmission, comprising:

[0033] The status determination module is used to determine whether the vehicle is in a parallel hybrid power state;

[0034] The status determination module is used to determine whether the vehicle can maintain parallel hybrid power mode based on the current status of the vehicle.

[0035] The pressure calculation module is used to determine the current driving state of the vehicle and the clutch state if the vehicle is in parallel hybrid mode, so as to calculate the clutch oil pressure request.

[0036] The pressure compensation module is used to perform clutch pressure compensation control based on the clutch's oil circuit pressure request.

[0037] Thirdly, embodiments of this application provide an electronic device, including:

[0038] The system includes a processor, a memory, and a bus. The processor is connected to the memory via the bus. The memory stores computer-readable instructions. When the computer-readable instructions are executed by the processor, they are used to implement the control method for clutch pressure compensation of the hybrid transmission as described above.

[0039] Fourthly, embodiments of this application provide a computer-readable storage medium storing a computer program that, when executed by a server, implements the control method for hybrid power transmission clutch pressure compensation as described above. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 A schematic flowchart illustrating a control method for clutch pressure compensation in a hybrid power transmission provided in this application embodiment;

[0042] Figure 2 A schematic diagram illustrating the overall process of a control method for clutch pressure compensation in a hybrid power transmission provided in this application embodiment;

[0043] Figure 3 A schematic flowchart illustrating another control method for clutch pressure compensation in a hybrid power transmission provided in this application embodiment;

[0044] Figure 4 This is a schematic diagram of the structure of a control device for compensating the clutch pressure of a hybrid power transmission provided in an embodiment of this application;

[0045] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0046] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0047] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0048] Please refer to Figure 1 , Figure 1 This is a flowchart illustrating a control method for clutch pressure compensation in a hybrid power transmission, provided as an embodiment of this application. (Refer to...) Figure 1 and Figure 2 The control method for clutch pressure compensation of the hybrid transmission includes:

[0049] 100. Confirm that the vehicle is in parallel hybrid power mode.

[0050] Understandably, plug-in hybrid electric vehicles (PHEVs) operate in multiple modes, including series, parallel, and engine direct drive. These modes allow the electric motor and engine to work in their respective areas of expertise, thereby achieving fuel efficiency across all operating conditions.

[0051] In series mode, the electric motor drives the vehicle, and the engine does not directly participate in driving. In this mode, the engine acts as a power source, providing electrical energy to the electric motor. Series mode is mainly effective at low to medium speeds, when the vehicle relies primarily on the electric motor for propulsion in urban roads and congested traffic, thereby reducing fuel consumption.

[0052] In parallel mode, both the engine and the electric motor provide driving force to the vehicle. This mode is mainly effective at medium to high speeds. When acceleration or overtaking is needed, the engine and electric motor work together in parallel to drive the vehicle, providing greater power output. Parallel mode allows for better utilization of the engine's high-efficiency range, improving overall efficiency.

[0053] In engine direct drive mode, the engine is directly connected to the drive wheels, and power is transmitted through a gear shifting mechanism. This mode is typically most suitable for medium- to high-speed cruising. Because the engine is directly connected to the drive wheels, the power transmission path is short, resulting in minimal power loss and thus improving overall efficiency.

[0054] Specifically, this application embodiment is used to perform pressure compensation control on the clutch when driving in parallel mode. It is necessary to first determine whether the vehicle is in a parallel hybrid state. If the vehicle is in a parallel hybrid state, the oil pressure request of the clutch needs to be calculated according to the driving conditions in order to achieve pressure compensation control on the clutch.

[0055] 200. Based on the current state of the vehicle, determine whether the vehicle can maintain parallel hybrid power mode.

[0056] Understandably, determining whether a vehicle can continuously maintain a parallel hybrid powertrain is a complex and critical process; this process involves not only real-time monitoring and analysis of the vehicle's powertrain system, but also consideration of various factors such as the external environment, driving habits, battery status, and the coordination efficiency between power sources.

[0057] Optionally, in this embodiment of the application, the vehicle's ability to maintain a parallel hybrid power state is mainly determined based on the hybrid target state sent by the VCU, the pressure build-up capability of the load oil pump, and the diagnostic results.

[0058] 300. If the vehicle is in parallel hybrid mode, determine the vehicle's current driving state and clutch state to calculate the clutch oil pressure request.

[0059] Specifically, if the vehicle maintains a parallel hybrid power state, the clutch oil pressure request is calculated based on the vehicle's current driving state and the clutch oil pressure fluctuation state in order to perform pressure compensation control on the clutch.

[0060] 400. Perform clutch pressure compensation control based on clutch oil circuit pressure requests.

[0061] Understandably, in hybrid vehicles, the clutch, as a key component of power transmission, directly affects the vehicle's power output efficiency and fuel economy. However, the clutch is affected by various factors during actual operation, such as oil temperature, oil pressure, and clutch wear. These factors can cause the clutch's operating state to deviate from its ideal state, thus affecting the overall vehicle performance. Therefore, this application embodiment performs clutch pressure supplementary control based on the clutch's oil circuit pressure request, achieving precise control of the clutch's working pressure, thereby improving the vehicle's overall performance and driving comfort.

[0062] As described above, the embodiments of this application determine that the vehicle is in a parallel hybrid power state; based on the current state of the vehicle, it is determined whether the vehicle can maintain the parallel hybrid power state; if the vehicle maintains the parallel hybrid power state, the current driving state of the vehicle and the clutch state are determined to calculate the clutch oil pressure request; clutch pressure compensation control is performed based on the clutch oil pressure request; clutch pressure compensation control is performed based on the current driving state of the vehicle and the clutch state to avoid poor oil pump suction, ensure the stability of clutch control under different driving conditions, and protect the clutch.

[0063] Based on the above embodiments, Figure 3 A flowchart of another control method for hybrid power transmission clutch pressure compensation according to an embodiment of this application is provided. This control method for hybrid power transmission clutch pressure compensation is a concretization of the aforementioned control method for hybrid power transmission clutch pressure compensation. (Reference) Figure 2 and Figure 3 The control method for clutch pressure compensation in this hybrid transmission includes:

[0064] 310. If the vehicle is currently turning, perform linear interpolation and table lookup based on the magnitude of the lateral acceleration and the actual pressure of the clutch oil circuit to obtain the requested value of the first clutch oil circuit pressure.

[0065] Specifically, during vehicle cornering, the vehicle experiences lateral acceleration due to centrifugal force. The magnitude of this lateral acceleration not only affects the vehicle's driving stability but may also be related to the clutch oil circuit pressure. To optimize the clutch control strategy and improve the vehicle's stability and performance during cornering, the first clutch oil circuit pressure request value can be determined based on the magnitude of the lateral acceleration and the current actual clutch oil circuit pressure using linear interpolation and table lookup.

[0066] 320. If the vehicle is currently accelerating or braking, perform linear interpolation and table lookup based on the magnitude of longitudinal acceleration and the actual pressure of the clutch oil circuit to obtain the second clutch oil circuit pressure request value.

[0067] Specifically, during acceleration or braking, the vehicle needs to increase power output to meet the driver's acceleration demands. At this time, the clutch, as a key component in power transmission, directly affects the efficiency and response speed of power transmission through adjustments to its hydraulic pressure. Therefore, it is necessary to obtain the requested clutch hydraulic pressure value.

[0068] Specifically, longitudinal acceleration is an important indicator for measuring vehicle acceleration performance. As longitudinal acceleration increases, the vehicle's power demand also increases accordingly. Therefore, based on the magnitude of longitudinal acceleration and the current actual pressure of the clutch oil circuit, linear interpolation and table lookup are performed to obtain the second clutch oil circuit pressure request value.

[0069] Optionally, longitudinal acceleration data can be collected in real time using acceleration sensors on the vehicle and filtered to remove noise, ensuring data accuracy. Similarly, the actual pressure of the clutch oil circuit can be collected in real time using sensors and synchronized with the longitudinal acceleration data for subsequent comprehensive analysis.

[0070] Optionally, an initial range of clutch oil circuit pressure request values ​​can be obtained by looking up a table. Then, within this range, a linear interpolation method can be used to fine-tune the value based on the specific longitudinal acceleration and the current actual clutch oil circuit pressure to obtain an accurate second clutch oil circuit pressure request value.

[0071] 330. If the current clutch oil circuit pressure fluctuates and exceeds the set threshold, linear interpolation and table lookup are performed based on the magnitude and duration of the pressure fluctuation to obtain the third clutch oil circuit pressure request value.

[0072] Understandably, clutch oil pressure fluctuations are usually detected by continuously monitoring pressure signals. Sensors are used to collect clutch oil pressure data in real time, and algorithms are used to analyze the data's changing trends and fluctuation range. To accurately detect fluctuations, a sliding window or filter can be set to smooth the raw data and reduce noise interference. At the same time, the standard deviation or variance of the data within the window can be calculated as a quantitative indicator of the fluctuation magnitude.

[0073] In addition, obtaining the current clutch oil pressure fluctuation and setting a reasonable fluctuation threshold is key to determining whether pressure fluctuation has occurred. Optionally, this threshold can be adjusted and optimized based on factors such as vehicle model, clutch type, and operating environment; when the detected pressure fluctuation exceeds the set threshold, it is considered that the current clutch oil pressure has fluctuated.

[0074] Optionally, after confirming that the clutch oil circuit pressure is fluctuating, it is necessary to further analyze the magnitude and duration of the fluctuation. The magnitude of the fluctuation reflects the severity of the fluctuation, while the duration provides information on how long the fluctuation lasts. These two parameters are crucial for subsequently determining the third clutch oil circuit pressure request value. The larger the fluctuation and the longer the duration, the more likely a larger pressure adjustment may be needed to restore the stability of the system.

[0075] Similar to the previous operating condition control strategy, the method of combining linear interpolation and table lookup can also be used here to obtain the third clutch oil circuit pressure request value. Specifically, based on the magnitude and duration of the vibration, the corresponding pressure adjustment range or base value is looked up in a pre-established table. Then, the linear interpolation method is used to calculate the accurate third clutch oil circuit pressure request value within this range based on the specific vibration situation.

[0076] 340. Calculate the requested value of the fourth clutch oil circuit pressure based on engine torque, generator torque, and oil temperature.

[0077] It should be noted that engine torque is one of the main power sources driving a vehicle forward. During clutch engagement, engine torque is transmitted to the transmission system through the clutch. The magnitude of engine torque directly affects the torque required for clutch transmission, and thus the clutch oil pressure requirements. When engine torque increases, the clutch oil pressure also needs to increase accordingly to maintain the stability and efficiency of power transmission.

[0078] In a hybrid power system, the generator motor not only serves as a power source but may also act as a generator to charge the battery or assist the engine. Its torque output will also affect the working state of the clutch. When the generator motor is generating electricity, its torque will act as a resistance torque on the transmission system, and the torque that the clutch needs to transmit will decrease accordingly. Conversely, when the generator motor is acting as a power source, its torque will increase the torque that the clutch needs to transmit. Therefore, the change in the generator motor torque is also one of the important factors in calculating the clutch oil circuit pressure request value.

[0079] Oil temperature is a crucial factor affecting lubricating oil viscosity and clutch friction characteristics. Changes in oil temperature directly impact the clutch's coefficient of friction and transmission efficiency. As oil temperature increases, lubricating oil viscosity decreases, leading to a reduction in the clutch's coefficient of friction and transmission efficiency. To maintain normal clutch operation and stable power transmission, the clutch oil pressure needs to be adjusted according to oil temperature changes. Generally, when oil temperature rises, the clutch oil pressure needs to be appropriately increased to compensate for the decrease in transmission efficiency.

[0080] Optionally, a comprehensive model can be established to calculate the requested oil pressure value for the fourth clutch. This model can consider the influence of multiple factors such as engine torque, generator torque, and oil temperature, and obtain the final oil pressure request value through linear interpolation, table lookup, or complex algorithms.

[0081] Specifically, clutch oil circuit pressure data under different combinations of engine torque, generator torque, and oil temperature can first be obtained through experiments or simulations, and a corresponding database or lookup table can be established. Then, in practical applications, based on the current engine torque, generator torque, and oil temperature values, the requested value of the fourth clutch oil circuit pressure can be obtained by searching or interpolating in the database or lookup table.

[0082] It should be noted that due to the complexity and variability of vehicle operating conditions, the above calculation method may need to be appropriately adjusted and optimized according to actual conditions. For example, an adaptive control algorithm can be introduced to adjust the clutch oil pressure request value in real time to adapt to the needs under different operating conditions.

[0083] The above describes how the clutch oil pressure requirement is calculated based on the vehicle's driving conditions in order to compensate for the clutch pressure.

[0084] Based on the above embodiments, the control method for hybrid transmission clutch pressure compensation can be further specified as follows: determining whether the vehicle can maintain a parallel hybrid state based on the current vehicle state includes:

[0085] The system determines whether the vehicle can maintain a parallel hybrid power state based on the hybrid power target state, load oil pump pressure build-up capability, and diagnostic results sent by the vehicle control unit (VCU).

[0086] Specifically, based on different driving conditions, it is determined whether the vehicle can maintain a parallel hybrid power state in order to calculate the clutch oil pressure request.

[0087] The VCU calculates the current hybrid target state based on the driver's input (such as accelerator pedal depth, brake pedal status, etc.), the vehicle's current state (such as vehicle speed, battery SOC, engine speed, etc.) and the preset driving mode. This state can include the power that the engine should output, the torque that the electric motor should provide, and the cooperative working mode between the two.

[0088] The VCU receives diagnostic results from various vehicle systems, including the engine, electric motor, power battery, and hydraulic system, and obtains diagnostic results indicating whether there is a fault.

[0089] For example, when the vehicle's hybrid power target state reaches the set target state, that is, when each component or parameter meets the set requirements, it can be set according to specific needs, and when the load oil pump pressure build-up capacity is within the set pressure build-up range, and the diagnostic results are all fault-free, it is determined that the vehicle can maintain the parallel hybrid power state.

[0090] Based on the above embodiments, the control method for clutch pressure compensation of a hybrid transmission can be further specified as follows: the clutch pressure compensation control based on the clutch oil circuit pressure request includes:

[0091] Obtain the maximum oil circuit pressure request value of the clutch; use the clutch oil circuit pressure arbitration module to take the maximum oil circuit pressure request value as the actual oil circuit pressure request of the clutch.

[0092] Specifically, by comparing the first clutch oil circuit pressure request value, the second clutch oil circuit pressure request value, the third clutch oil circuit pressure request value, and the fourth clutch oil circuit pressure request value, the maximum oil circuit pressure request value of the clutch is obtained. Then, the clutch oil circuit pressure arbitration module uses the maximum oil circuit pressure request value as the actual clutch oil circuit pressure request; pressure compensation control is performed on the clutch to avoid poor oil pump suction, ensure the stability of clutch control under different driving conditions, and protect the clutch.

[0093] Based on the above embodiments, the control method for clutch pressure compensation of a hybrid transmission can be further specified as follows: after performing clutch pressure compensation control based on the clutch oil circuit pressure request, it further includes:

[0094] When a command to exit parallel hybrid mode is received from the VCU, the clutch is released to exit the parallel hybrid mode.

[0095] Specifically, when the vehicle is in parallel hybrid mode, the torque of the engine and the electric motor can be transmitted to the transmission system through the clutch to jointly drive the vehicle forward. When it is necessary to exit the parallel mode, it is necessary to control the release of the clutch. If it is necessary to exit the parallel mode, the VCU sends an exit parallel mode command to control the clutch release, thus ensuring safety.

[0096] Based on the above embodiments, the control method for clutch pressure compensation of a hybrid transmission can be further specified as follows: after performing clutch pressure compensation control based on the clutch oil circuit pressure request, it further includes:

[0097] When the vehicle is in its first driving condition, the oil pump's oil suction capacity weakens. This increases the time window for obtaining the clutch oil pressure request and increases the clutch oil pressure differential in order to diagnose the fault.

[0098] Specifically, when a vehicle is under relatively aggressive driving conditions, the oil pump's oil suction capacity weakens, and a longer time window and clutch oil circuit pressure difference need to be set for diagnosing leakage faults.

[0099] During aggressive driving, both engine speed and load increase, causing the oil pump to supply more oil to meet the engine's needs. This high-load condition may weaken the oil pump's suction capacity. Therefore, it is necessary to set a longer time window and clutch oil circuit pressure difference to improve the sensitivity of fault diagnosis.

[0100] Based on the above embodiments, the control method for hybrid transmission clutch pressure compensation can be further specified as follows: after determining whether the vehicle can maintain parallel hybrid power mode according to the current vehicle state, it further includes:

[0101] If the vehicle cannot maintain the parallel hybrid power mode, then control the vehicle to exit the parallel hybrid power mode.

[0102] Specifically, if the vehicles cannot maintain parallel operation, they will exit the parallel operation without the need for clutch pressure compensation control.

[0103] The steps described above are not strictly performed in the order of their numbers; they should be understood as a whole.

[0104] Secondly, based on the above embodiments, Figure 4 This is a schematic diagram of a control device for compensating clutch pressure in a hybrid power transmission, provided as an embodiment of this application. (Reference) Figure 4 The control device for compensating the clutch pressure of the hybrid transmission provided in this embodiment specifically includes: a state determination module 401, a state judgment module 402, a pressure calculation module 403, and a pressure supplementation module 404.

[0105] The state determination module 401 is used to determine that the vehicle is in a parallel hybrid power state; the state judgment module 402 is used to determine whether the vehicle can maintain the parallel hybrid power state based on the current state of the vehicle; the pressure calculation module 403 is used to determine the current driving state of the vehicle and the clutch state if the vehicle maintains the parallel hybrid power state, so as to calculate the clutch oil pressure request; and the pressure compensation module 404 is used to perform clutch pressure compensation control based on the clutch oil pressure request.

[0106] As described above, the embodiments of this application determine that the vehicle is in a parallel hybrid power state; based on the current state of the vehicle, it is determined whether the vehicle can maintain the parallel hybrid power state; if the vehicle maintains the parallel hybrid power state, the current driving state of the vehicle and the clutch state are determined to calculate the clutch oil pressure request; clutch pressure compensation control is performed based on the clutch oil pressure request; clutch pressure compensation control is performed based on the current driving state of the vehicle and the clutch state to avoid poor oil pump suction, ensure the stability of clutch control under different driving conditions, and protect the clutch.

[0107] The control device for hybrid power transmission clutch pressure compensation provided in this application embodiment can be used to execute the control method for hybrid power transmission clutch pressure compensation provided in the above embodiment, and has corresponding functions and beneficial effects.

[0108] Thirdly, embodiments of this application also provide an electronic device that can integrate the control device for hybrid power transmission clutch pressure compensation provided in embodiments of this application. Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. (Reference) Figure 5The electronic device includes an input device 73, an output device 74, a memory 72, and one or more processors 71. The memory 72 stores one or more programs. When the one or more programs are executed by the one or more processors 71, the one or more processors 71 implement the hybrid transmission clutch pressure compensation control method provided in the above embodiments. The input device 73, output device 74, memory 72, and processors 71 can be connected via a bus or other means. Figure 5 Taking the example of a connection between China and Israel via a bus.

[0109] The processor 71 executes various functional applications and data processing of the device by running software programs, instructions and modules stored in the memory 72, thereby realizing the above-mentioned control method for clutch pressure compensation of the hybrid transmission.

[0110] The electronic device provided above can be used to execute the control method for clutch pressure compensation of the hybrid transmission provided in the above embodiments, and has corresponding functions and beneficial effects.

[0111] Fourthly, embodiments of this application also provide a computer-readable storage medium, which includes a stored computer program; wherein, when the computer program is running, it controls the device where the computer-readable storage medium is located to execute the control method for hybrid power transmission clutch pressure compensation as described above, and can achieve the same beneficial effects.

[0112] Of course, the computer-executable instructions provided in the embodiments of this application are not limited to the control method for hybrid transmission clutch pressure compensation as described above, but can also execute related operations in the control method for hybrid transmission clutch pressure compensation provided in any embodiment of this application.

[0113] Fifthly, embodiments of this application also provide a computer program product. The methods described in the various embodiments of this application can be implemented entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the various embodiments of this application are executed entirely or partially. The computer can be a general-purpose computer, a special-purpose computer, a computer network, network equipment, user equipment, core network equipment, OAM (Open Application Model), or other programmable devices.

[0114] The computer program or instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions may be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium may be any available medium that a computer can access, or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; or an optical medium, such as a digital video optical disc; or a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or non-volatile storage medium, or may include both volatile and non-volatile types of storage media.

[0115] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0116] In addition, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0117] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they 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 a portion 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 an electronic 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 USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0118] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0119] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0120] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A control method for clutch pressure compensation in a hybrid power transmission, characterized in that, include: Determine that the vehicle is in a parallel hybrid power configuration; Based on the current state of the vehicle, determine whether the vehicle can maintain parallel hybrid power mode; If the vehicle maintains a parallel hybrid powertrain, the current driving state and clutch state are determined to calculate the clutch oil pressure request, including: if the vehicle is currently turning, linear interpolation and table lookup are performed based on the magnitude of lateral acceleration and the actual current clutch oil pressure to obtain the first clutch oil pressure request value; if the vehicle is currently accelerating or braking, linear interpolation and table lookup are performed based on the magnitude of longitudinal acceleration and the actual current clutch oil pressure to obtain the second clutch oil pressure request value; if the current clutch oil pressure fluctuates and exceeds a set threshold, linear interpolation and table lookup are performed based on the magnitude and duration of the pressure fluctuation to obtain the third clutch oil pressure request value; and a fourth clutch oil pressure request value is calculated based on engine torque, generator torque, and oil temperature. Clutch pressure compensation control based on clutch oil circuit pressure request includes: obtaining the maximum oil circuit pressure request value of the clutch; and using the maximum oil circuit pressure request value as the actual oil circuit pressure request of the clutch through the clutch oil circuit pressure arbitration module.

2. The control method for clutch pressure compensation of a hybrid power transmission according to claim 1, characterized in that, The step of determining whether the vehicle can maintain parallel hybrid power mode based on its current state includes: The system determines whether the vehicle can maintain a parallel hybrid power state based on the hybrid power target state, load oil pump pressure build-up capability, and diagnostic results sent by the vehicle control unit (VCU).

3. The control method for clutch pressure compensation of a hybrid transmission according to claim 1, characterized in that, After performing clutch pressure compensation control based on the clutch oil pressure request, the method further includes: When a command to exit parallel hybrid mode is received from the vehicle control unit (VCU) of the electric vehicle, the clutch is released to exit the parallel hybrid mode.

4. The control method for clutch pressure compensation of a hybrid power transmission according to claim 1, characterized in that, After performing clutch pressure compensation control based on the clutch oil pressure request, the method further includes: When the vehicle is in its first driving condition, the oil pump's oil suction capacity weakens. This increases the time window for obtaining the clutch oil pressure request and increases the clutch oil pressure differential in order to diagnose the fault.

5. The control method for clutch pressure compensation of a hybrid power transmission according to claim 1, characterized in that, After determining whether the vehicle can maintain its parallel hybrid power mode based on its current state, the process further includes: If the vehicle cannot maintain the parallel hybrid power mode, then control the vehicle to exit the parallel hybrid power mode.

6. A control device for compensating clutch pressure in a hybrid power transmission, characterized in that, include: The status determination module is used to determine whether the vehicle is in a parallel hybrid power state; The status determination module is used to determine whether the vehicle can maintain parallel hybrid power mode based on the current status of the vehicle. The pressure calculation module is used to determine the current driving state of the vehicle and the clutch state if the vehicle is in parallel hybrid mode, so as to calculate the clutch oil pressure request. If the vehicle maintains a parallel hybrid powertrain state, the current driving state and clutch state of the vehicle are determined to calculate the clutch oil pressure request, including: if the vehicle is currently turning, linear interpolation and table lookup are performed based on the magnitude of lateral acceleration and the actual current clutch oil pressure to obtain a first clutch oil pressure request value; if the vehicle is currently accelerating or braking, linear interpolation and table lookup are performed based on the magnitude of longitudinal acceleration and the actual current clutch oil pressure to obtain a second clutch oil pressure request value; if the current clutch oil pressure fluctuates and exceeds a set threshold, linear interpolation and table lookup are performed based on the magnitude and duration of the pressure fluctuation to obtain a third clutch oil pressure request value; and a fourth clutch oil pressure request value is calculated based on engine torque, generator torque, and oil temperature. The pressure compensation module is used to perform clutch pressure compensation control based on the clutch's oil circuit pressure request; the clutch pressure compensation control based on the clutch's oil circuit pressure request includes: obtaining the maximum oil circuit pressure request value of the clutch; and using the maximum oil circuit pressure request value as the actual oil circuit pressure request of the clutch through the clutch oil circuit pressure arbitration module.

7. An electronic device, characterized in that, include: The system includes a processor, a memory, and a bus, wherein the processor is connected to the memory via the bus, and the memory stores computer-readable instructions that, when executed by the processor, are used to implement the control method for clutch pressure compensation of a hybrid transmission as described in any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a server, implements the control method for hybrid transmission clutch pressure compensation as described in any one of claims 1-5.

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