Torque control method of hybrid vehicle, vehicle controller, and hybrid vehicle

Abstract

The present invention provides a torque control method for a hybrid vehicle, a vehicle controller, and a hybrid vehicle. The method is applied to the field of vehicle control technology, including: real-time detection of the current gear of the hybrid vehicle and the vehicle state of the hybrid vehicle in the current gear; judging the next operating mode of the hybrid vehicle in the current gear according to the vehicle state; requesting the clutch state from the automatic transmission control unit TCU of the hybrid vehicle according to the next operating mode; after the clutch state request is successful, requesting torque from the power transmission system of the hybrid vehicle according to the next operating mode; the torque includes positive torque and negative torque. The present invention can realize torque control in various scenarios, support torque control of hybrid vehicles when there is no reverse gear, and can save the reverse gear mechanical structure, thereby making the structure of the gearbox in the engine compartment simpler.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle control, and more specifically, relates to a torque control method for a hybrid vehicle, a vehicle controller, and a hybrid vehicle. Background Art

[0002] At present, most of the front axle gearboxes equipped in vehicles are gearboxes with reverse gears. When the vehicle achieves reverse gear, the driving direction can be changed by combining the gearbox with the reverse gear. On this basis, the torque control scheme is also relatively simple. However, for vehicles with small engine compartment layout space, the setting of the reverse gear in the gearbox will take up more space. Therefore, in order to save axial layout space, some vehicles will choose not to configure the reverse gear. At this time, how to achieve torque control in various scenarios has become a problem that technicians in this field need to solve urgently. Summary of the invention

[0003] The object of the present invention is to provide a torque control method for a hybrid vehicle, a vehicle controller, and a hybrid vehicle, so as to realize torque control in various scenarios.

[0004] To achieve the above object, a first aspect of the present invention provides a torque control method for a hybrid vehicle, the torque control method for a hybrid vehicle comprising:

[0005] Real-time detection of the current gear position of the hybrid vehicle and the vehicle state of the hybrid vehicle in the current gear position;

[0006] determining a next operating mode of the hybrid vehicle in the current gear according to the vehicle state;

[0007] requesting a clutch state from an automatic transmission control unit TCU of the hybrid vehicle according to the next operating mode;

[0008] After the clutch state request is successful, torque is requested from the powertrain system of the hybrid vehicle according to the next operation mode; the torque includes positive torque and negative torque.

[0009] In a possible implementation, the vehicle state of the hybrid vehicle in the current gear includes the engine state of the hybrid vehicle in the current gear; if the current gear is the R gear, determining the next operating mode of the hybrid vehicle in the current gear according to the vehicle state includes:

[0010] If the engine state is a start state, determining that the next operation mode of the hybrid vehicle is a series mode;

[0011] If the engine state is a shutdown state, it is determined that the next operating mode of the hybrid vehicle is a pure electric rear-drive mode.

[0012] In a possible implementation, the power transmission system includes a P4 motor; if the current gear of the hybrid vehicle is the R gear, requesting torque from the power transmission system according to the next operating mode includes:

[0013] If the next operation mode is the series mode, a negative driving torque is requested from the P4 motor, and a power generation torque is requested from other power mechanisms in the power transmission system except the P4 motor;

[0014] If the next operating mode is the pure electric rear-wheel drive mode, negative driving torque is requested from the P4 motor.

[0015] In a possible implementation, the vehicle state of the hybrid vehicle in the current gear includes an engine state and a creeping state of the hybrid vehicle in the current gear; if the current gear of the hybrid vehicle is the D gear, determining the next operating mode of the hybrid vehicle in the current gear according to the vehicle state includes:

[0016] If the engine state is a start state and the creep state is an activated creep state, determining that the next operation mode of the hybrid vehicle is a series mode;

[0017] If the engine state is a start state and the creep state is a non-activated creep state, determining that the next operation mode of the hybrid vehicle is a parallel mode;

[0018] If the engine state is a shutdown state and the creep state is an activated creep state, determining that the next operation mode of the hybrid vehicle is a pure electric rear-drive mode;

[0019] If the engine state is a shutdown state and the creep state is creep not activated, it is determined that the next operating mode of the hybrid vehicle is a pure electric four-wheel drive mode.

[0020] In a possible implementation, the power transmission system includes a P2 motor and a P4 motor; if the current gear of the hybrid vehicle is a D gear, requesting torque from the power transmission system according to the next operating mode includes:

[0021] If the next operation mode is the series mode, the P2 motor and the engine are respectively requested to generate power torque, and the P4 motor is requested to generate positive drive torque;

[0022] If the next operation mode is the parallel mode, the P2 motor and the engine are respectively requested to provide a driving torque, and the P4 motor is requested to provide a positive driving torque;

[0023] If the next operating mode is the pure electric rear-drive mode, forward drive torque is requested from the P4 motor;

[0024] If the next operating mode is the pure electric four-wheel drive mode, a driving torque is requested from the P2 motor and a positive driving torque is requested from the P4 motor.

[0025] In a possible implementation, requesting the automatic transmission control unit TCU of the hybrid vehicle for the state of the clutch according to the next operating mode includes:

[0026] If the next operating mode is an operating mode of the hybrid vehicle in the R gear, the P gear, or the N gear, a request is made to the TCU to open the clutch.

[0027] In a possible implementation, requesting the automatic transmission control unit TCU of the hybrid vehicle for the state of the clutch according to the next operating mode includes:

[0028] If the next operating mode is the series mode in the D gear or the pure electric rear-drive mode in the D gear, requesting the TCU to open the clutch;

[0029] If the next operating mode is the parallel mode in the D gear or the pure electric four-wheel drive mode in the D gear, the clutch is requested to close to the TCU.

[0030] According to a second aspect of the present invention, a vehicle controller is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned method for controlling the torque of a hybrid vehicle when executing the computer program.

[0031] According to a third aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the hybrid vehicle torque control method are implemented.

[0032] A fourth aspect of the present invention further provides a hybrid vehicle, comprising the vehicle controller described above.

[0033] The torque control method for a hybrid vehicle, the vehicle controller, and the hybrid vehicle provided by the present invention have the following beneficial effects:

[0034] Different from the technical solution of the prior art that only supports hybrid vehicles to use reverse gear, the present invention provides a torque control solution for hybrid vehicles, that is, first determine the gear signal of the hybrid vehicle, on this basis, determine the next operating mode of the hybrid vehicle in combination with the vehicle state of the hybrid vehicle, and then realize the configuration of the clutch by requesting the state of the clutch, and realize torque control based on the next operating mode. In other words, the present invention determines the next operating mode (for example, series mode, parallel mode and pure electric mode) of the front and rear axles of the hybrid vehicle by judging the current gear state, and then controls the opening and closing of the clutch of the gearbox according to the next operating mode, and at the same time determines the request for torque from the power transmission system (motor, engine) according to the next operating mode, and then controls the working mode and torque of the motor and engine of the hybrid vehicle, thereby realizing the torque control of the hybrid vehicle in various gear scenarios. The above method only needs to determine whether the motor or the engine generates the driving power according to the gear and the operating mode of the front and rear axles, and the torque includes positive torque and negative torque. On this basis, requesting torque from the power transmission system can realize the forward and reverse movement of the vehicle. Therefore, this solution can support the reverse gear driving of the vehicle when the reverse gear is not configured. The application of the solution of the present invention can save the reverse gear mechanical structure, thereby making the structure of the gearbox in the engine compartment simpler, thereby saving vehicle costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A schematic flow chart of a torque control method for a hybrid vehicle provided by an embodiment of the present invention;

[0037] Figure 2 A schematic flow chart of a torque control method for a hybrid vehicle provided by another embodiment of the present invention;

[0038] Figure 3 A schematic structural diagram of a power transmission system of a hybrid vehicle provided by an embodiment of the present invention;

[0039] Figure 4 A schematic flow chart of a torque control method for a hybrid vehicle provided by yet another embodiment of the present invention;

[0040] Figure 5 A schematic diagram of the structure of a vehicle controller provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] Please refer to Figure 1 , Figure 1 The present invention is a flow chart of a torque control method for a hybrid vehicle provided by an embodiment of the present invention. The first aspect of the present invention provides a torque control method for a hybrid vehicle. The execution subject of the torque control method for the hybrid vehicle is a vehicle controller VCU. On this basis, the torque control method for the hybrid vehicle includes:

[0044] S101: Detecting the current gear position of the hybrid vehicle and the vehicle state of the hybrid vehicle in the current gear position in real time.

[0045] In this embodiment, before real-time detection of the current gear position of the hybrid vehicle and the vehicle state of the hybrid vehicle in the current gear position, the torque control method of the hybrid vehicle may further include: detecting whether the hybrid vehicle has completed high-voltage power-up. Correspondingly, if the hybrid vehicle has completed high-voltage power-up, the current gear position of the hybrid vehicle and the vehicle state of the hybrid vehicle in the current gear position are detected in real-time.

[0046] S102: Determine a next operating mode of the hybrid vehicle in the current gear according to the vehicle state of the hybrid vehicle in the current gear.

[0047] In this embodiment, the operation modes of the hybrid vehicle include but are not limited to series mode, parallel mode, pure electric mode, etc., wherein the pure electric mode also includes pure electric rear-wheel drive mode and pure electric four-wheel drive mode according to different drive structures.

[0048] S103: Requesting the automatic transmission control unit TCU of the hybrid vehicle for the state of the clutch according to the next operation mode of the hybrid vehicle in the current gear.

[0049] In this embodiment, the state of the requested clutch includes a request for the clutch to be opened and a request for the clutch to be closed.

[0050] S104: After the clutch state request is successful, request torque from the powertrain system according to the next operation mode of the hybrid vehicle in the current gear, wherein the torque includes positive torque and negative torque.

[0051] In this embodiment, the torque is requested from the powertrain system of the hybrid vehicle according to the next operation mode of the hybrid vehicle in the current gear, which can be described in detail as follows:

[0052] A power transmission mechanism that performs a driving function in the power transmission system is determined according to a next operation mode of the hybrid vehicle in the current gear, and torque is requested from the power transmission mechanism that performs the driving function.

[0053] From the above description, it can be seen that, different from the technical solution of the prior art that only supports hybrid vehicles to use reverse gears, the embodiment of the present invention provides a torque control solution for hybrid vehicles, that is, first determine the gear signal of the hybrid vehicle, on this basis, determine the next operating mode of the hybrid vehicle in combination with the vehicle state of the hybrid vehicle, and then realize the configuration of the clutch by requesting the state of the clutch, and realize torque control based on the next operating mode. That is to say, the embodiment of the present invention determines the next operating mode (for example, series mode, parallel mode and pure electric mode) of the front and rear axles of the hybrid vehicle by judging the current gear state, and then controls the opening and closing of the clutch of the gearbox according to the next operating mode, and at the same time determines the request for torque from the power transmission system (motor, engine) according to the next operating mode, and then controls the working mode and torque of the motor and engine of the hybrid vehicle, thereby realizing the torque control of the hybrid vehicle in various gear scenarios. The above method only needs to determine whether the motor or the engine generates the driving power and the respective torques according to the gear and the operating mode of the front and rear axles, and the torque includes positive driving torque and negative driving torque. On this basis, requesting torque from the power transmission system can realize the forward and reverse movement of the vehicle. Therefore, this solution can support the reverse gear driving of the vehicle when the reverse gear is not configured. The solution of the embodiment of the present invention can save the reverse gear mechanical structure, thereby making the structure of the gearbox in the engine compartment simpler, thereby saving vehicle costs.

[0054] In a possible implementation, if the next operating mode is the operating mode of the hybrid vehicle in the R gear (that is, when the current gear of the hybrid vehicle is the R gear), a request is made to the TCU to open the clutch.

[0055] In this embodiment, if the current gear is R gear (i.e. reverse gear), the clutch is requested to be opened from the automatic transmission control unit TCU, and the clutch is opened after the TCU responds. On this basis, the actual state of the clutch can be detected, and after the clutch state request is successfully detected (i.e. after the clutch is opened), the torque is requested from the power transmission mechanism of the hybrid vehicle according to the next operating mode of the hybrid vehicle in the current gear.

[0056] In a possible implementation, the vehicle state of the hybrid vehicle in the current gear includes the engine state of the hybrid vehicle in the current gear. If the current gear of the hybrid vehicle is the R gear, then determining the next operating mode of the hybrid vehicle according to the vehicle state of the hybrid vehicle includes:

[0057] If the engine state of the hybrid vehicle is in the start state, the next operation mode of the hybrid vehicle is determined to be the series mode. If the engine state of the hybrid vehicle is in the stop state, the next operation mode of the hybrid vehicle is determined to be the pure electric rear drive mode.

[0058] In this embodiment, if the engine is started in R gear, the system enters the series mode; if the engine is not started, the system enters the pure electric rear-wheel drive mode.

[0059] In a possible implementation, the power transmission system includes a P4 motor. If the current gear of the hybrid vehicle is the R gear, requesting torque from the power transmission system according to the next operating mode of the hybrid vehicle includes:

[0060] If the next operation mode of the hybrid vehicle is the series mode, negative drive torque is requested from the P4 motor and power generation torque is requested from other power mechanisms in the powertrain except the P4 motor. If the next operation mode of the hybrid vehicle is the pure electric rear-drive mode, negative drive torque is requested from the P4 motor.

[0061] From the above description, it can be seen that in this embodiment, when the reverse gear is realized, the P4 motor needs to output negative driving torque. In other words, this embodiment can realize the reverse gear of the hybrid vehicle through the reversing function of the P4 motor (for example, from outputting positive torque to outputting negative torque). And, from the above description, it can be seen that the engine does not output driving torque in each mode under the R gear to ensure safe switching from other gears to the R gear.

[0062] In this embodiment, the other power mechanisms in the power transmission system except the P4 motor include an engine and other motors that may exist. Figure 3 , as a specific implementation of this embodiment, Figure 3 The hybrid vehicle in the embodiment is a P2+P4 architecture, that is, the power transmission system of the hybrid vehicle includes a front axle part and a rear axle part, wherein the front axle part is provided with an engine, a k0 clutch, a P2 motor, a dual-clutch automatic transmission DCT (wherein the DCT is provided with a k1k2 clutch, and a Figure 3 For example, the clutch claimed in each embodiment of the present invention refers to the k1k2 clutch in the DCT, wherein the rear axle part is provided with a P4 motor. Figure 3 In addition to the P4 motor, the other power mechanisms described in this embodiment include an engine and a P2 motor. Figure 2It can be seen that the specific method of torque control in R gear can be: determine the operating mode (that is, the next operating mode) that the hybrid vehicle needs to enter according to the state of the engine, request the k1k2 clutch to open, and after the k1k2 clutch is opened, if the next operating mode of the hybrid vehicle in R gear is the series mode, request negative drive torque from the P4 motor, and request power generation torque from the engine and P2 motor. If the next operating mode of the hybrid vehicle in R gear is the pure electric rear-drive mode, only negative drive torque is requested from the P4 motor. Among them, Figure 2 The P4 motor torque reversing involved in the description refers to the fact that under other gear conditions, the P4 motor outputs mostly positive torque. Therefore, when driving in reverse gear, the reversing function of the P4 motor can be used to make the P4 motor output negative torque, thereby supporting reverse gear driving when no reverse gear is configured.

[0063] In summary, when the current gear is the R gear, the overall process of the torque control of the hybrid vehicle can be: judging the next operating mode of the hybrid vehicle according to the current engine state of the hybrid vehicle (that is, judging whether the operating mode of the hybrid vehicle in the R gear is the series mode or the pure electric rear-drive mode), and requesting the clutch to be opened to the automatic transmission control unit TCU, and the TCU opens the clutch after responding, and after detecting that the clutch is opened, requesting torque from each power mechanism of the hybrid vehicle power transmission system based on the next operating mode of the hybrid vehicle. On this basis, it can be seen that, different from the technical solution of hybrid vehicles using reverse gears to achieve reverse gear control in the prior art, the embodiment of the present invention provides a reverse gear control solution without reverse gears, that is, the next operating mode of the hybrid vehicle in the R gear is determined in combination with the vehicle state of the hybrid vehicle, the clutch configuration is achieved by requesting the clutch state, and the reverse gear control is achieved based on the next operating mode of the hybrid vehicle in the R gear. That is to say, even if the hybrid vehicle's gearbox is not equipped with a reverse gear, the embodiment of the present invention can also control the reverse gear of the hybrid vehicle by requesting the clutch state and controlling the vehicle's operating mode. Therefore, the application of the solution of the embodiment of the present invention can omit the reverse gear mechanical structure, thereby making the structure of the gearbox in the engine compartment simpler, thereby saving vehicle costs.

[0064] In a possible implementation, requesting the clutch state from the automatic transmission control unit TCU of the hybrid vehicle according to the next operating mode can be described in detail as follows:

[0065] If the next operating mode is the series mode in the D gear or the pure electric rear-wheel drive mode in the D gear, the clutch is requested to open from the TCU. If the next operating mode is the parallel mode in the D gear or the pure electric four-wheel drive mode in the D gear, the clutch is requested to close from the TCU.

[0066] Different from other gears, in D gear, it is necessary to request the clutch state in combination with the specific operating mode. Specifically, if the front axle power mechanism does not need to output driving torque (such as series mode, pure electric rear-wheel drive mode), the clutch is requested to open from the TCU. If the front axle power mechanism needs to output driving torque (such as parallel mode, pure electric four-wheel drive mode), the clutch is requested to close from the TCU.

[0067] In a possible implementation, the vehicle state of the hybrid vehicle in the current gear includes the engine state and creeping state of the hybrid vehicle in the current gear. If the current gear of the hybrid vehicle is the D gear, the next operation mode of the hybrid vehicle is determined according to the vehicle state of the hybrid vehicle, including:

[0068] If the engine state of the hybrid vehicle is the start state and the creep state is the activated creep state, it is determined that the next operation mode of the hybrid vehicle is the series mode.

[0069] If the engine state of the hybrid vehicle is the start state and the creep state is the inactivated creep state, it is determined that the next operation mode of the hybrid vehicle is the parallel mode.

[0070] If the engine state of the hybrid vehicle is the shutdown state and the creep state is the activated creep state, it is determined that the next operation mode of the hybrid vehicle is the pure electric rear-drive mode.

[0071] If the engine state of the hybrid vehicle is the shutdown state and the creep state is the inactivated creep state, it is determined that the next operating mode of the hybrid vehicle is the pure electric four-wheel drive mode.

[0072] In this embodiment, if the current gear is D gear (forward gear), the current engine state and creep state of the hybrid vehicle can be detected, and then the next operating mode of the hybrid vehicle can be determined according to the engine state and creep state, and torque is requested from the powertrain system based on the next operating mode of the hybrid vehicle. It should be pointed out that when the present solution is implemented, the judgment of the next operating mode is not limited to the engine state and creep state mentioned in the embodiment of the present invention, and it can also be judged comprehensively based on various factors such as the driver's intention and the vehicle power, which is not limited here.

[0073] In this embodiment, the series mode is to request driving torque from the P4 motor and requesting power generation torque from other power transmission mechanisms in the power transmission system except the P4 motor. The parallel mode is to request driving torque from both the P4 motor and other power transmission mechanisms in the power transmission system except the P4 motor. The pure electric rear-wheel drive mode is to request driving torque from the P4 motor and requesting power generation torque from other power transmission mechanisms in the power transmission system except the P4 motor and the engine. The pure electric four-wheel drive mode is to request driving torque from both the P4 motor and other power transmission mechanisms in the power transmission system except the engine. Among them, when the current gear is D gear, the forward driving torque is requested from the P4 motor, and all the aforementioned modes are applicable.

[0074] In this embodiment, reference can be made to Figure 3 and Figure 4 , the power transmission system of the hybrid vehicle may include a P2 motor and a P4 motor in addition to the engine. That is, when the hybrid vehicle is a P2+P4 architecture and the current gear is D gear, the torque is requested from the power transmission system according to the next operating mode of the hybrid vehicle, which can be detailed as:

[0075] If the next operating mode of the hybrid vehicle is the series mode, power generation torque is requested from the P2 motor and the engine, and forward drive torque is requested from the P4 motor.

[0076] If the next operating mode of the hybrid vehicle is the parallel mode, driving torque is requested from the P2 motor and the engine respectively, and positive driving torque is requested from the P4 motor.

[0077] If the next operating mode of the hybrid vehicle is the pure electric rear-wheel drive mode, a positive driving torque is requested from the P4 motor.

[0078] If the next operating mode of the hybrid vehicle is the pure electric four-wheel drive mode, a driving torque is requested from the P2 motor and a positive driving torque is requested from the P4 motor.

[0079] On this basis, the following is a specific implementation of the torque control scheme for the above-mentioned hybrid vehicle in D gear: When entering the series mode, the VCU requests the k1k2 clutch to open, controls the P4 motor to achieve creeping, and the operating mode enters the series mode. When entering the parallel mode, the VCU adjusts the speed of the P2 motor so that the speed of the k1k2 clutch input shaft and the output shaft are synchronized. After the speed is synchronized, the k1k2 clutch is requested to be closed, the front axle participates in the vehicle drive, and the front axle is allowed to output torque, and the operating mode enters the parallel mode. When entering the pure electric rear-wheel drive mode, the VCU requests the k1k2 clutch to open, controls the P4 motor to achieve creeping, and limits the torque output of the P2 motor (that is, the front axle is not allowed to output torque). When entering the pure electric four-wheel drive mode, the VCU controls the speed of the P2 motor to synchronize the speeds of both ends of the k1k2 clutch, requests the k1k2 clutch to close, and releases the torque limit of the P2 motor at the same time.

[0080] In this embodiment, if the current speed of the hybrid vehicle is greater than a preset threshold, the current creeping state of the hybrid vehicle can be determined as inactive creeping, and if the current speed of the hybrid vehicle is not greater than the preset threshold, the current creeping state of the hybrid vehicle can be determined as active creeping. The preset threshold can be 10 km / h.

[0081] From the above description, it can be seen that when the hybrid vehicle activates creeping in D gear, only the P4 motor provides driving torque regardless of which operating mode it is. If the driver switches the hybrid vehicle from D gear to R gear when the hybrid vehicle is at a low speed (that is, when the hybrid vehicle is in creeping state), it is only necessary to reverse the torque of the P4 motor without adjusting other power mechanisms except the P4 motor. Therefore, from the overall perspective of the torque control scheme in D gear and R gear, the scheme of the embodiment of the present invention can also effectively ensure the smoothness of gear switching.

[0082] Among them, you can refer to Figure 4 When judging the various operating modes in D gear, the judgment conditions are not limited to the above-mentioned "current engine status, current creep status", etc. Other judgment conditions can be comprehensively considered in actual implementation. For example, when entering the pure electric four-wheel drive mode, the VCU can also monitor the driver's intention (such as pedal opening) and the vehicle status (such as vehicle speed, battery power, etc.) to determine whether to enter the pure electric four-wheel drive mode. If the pure electric four-wheel drive mode is not entered, the VCU requests the k1k2 clutch to open and limits the P2 motor torque output. If the pure electric four-wheel drive mode is entered, that is, the P2 motor speed is controlled to synchronize the speeds at both ends of the k1k2 clutch, and then the k1k2 clutch is requested to close, and the P2 motor torque limit is released at the same time.

[0083] Based on the above embodiments when the current gear is D gear or R gear, it can be known that when the current engine state is not stopped, the hybrid vehicle enters the pure electric mode (pure electric rear-wheel drive mode or pure electric four-wheel drive mode).

[0084] In the actual determination of the series mode or the parallel mode, the following steps may also be referred to determine the next operation mode of the hybrid vehicle: when the current engine state is the start state, if the vehicle speed is low (for example, the creeping state or the current vehicle speed is less than the preset speed value), the series mode is entered; if the vehicle speed is high (for example, the non-creeping state or the current vehicle speed is not less than the preset speed value), the parallel mode is entered. Of course, the above conditions are not limited, and the power generation request may also be considered comprehensively. For example, if the vehicle speed is low (for example, the creeping state or the current vehicle speed is less than the preset speed value) or the power generation request is large, the series mode is entered; if the vehicle speed is high (for example, the non-creeping state or the current vehicle speed is not less than the preset speed value) or a low-speed high-torque request occurs, the parallel mode is entered. In the above, the power generation request or the low-speed high-torque request is issued by the driver. In the above, it should be noted that the control priority of this step is lower than the control priority of the above judgment steps, that is, when the above judgment steps conflict with this step, the above judgment steps shall prevail.

[0085] In each of the above embodiments, the specific torque may be determined according to existing means, which will not be described in detail here.

[0086] In a possible implementation, if the next operating mode is the operating mode of the hybrid vehicle in the P gear or the N gear (that is, the current gear is the P gear or the N gear), the clutch is requested to be opened to the TCU.

[0087] In this embodiment, if the current gear is P (parking gear) or N (neutral gear), the clutch can be directly requested to open from the TCU, and the TCU opens the clutch after responding. At this time, the vehicle state is parking state or coasting state, the operation mode will not change, and there is no need to request torque from the power transmission system (that is, the torque requested from the power transmission system is zero).

[0088] Based on the above embodiments, the present invention's conception of torque control under various gears is: real-time detection of the current gear of the hybrid vehicle, and different processing according to different gears. For P gear or N gear, it is sufficient to directly request the TCU to open the clutch. For D gear or R gear, it is necessary to determine the next operating mode of the hybrid vehicle according to the corresponding judgment conditions, and after determining the next operating mode, request the clutch state from the TCU and request torque from the power transmission system. In other words, the present invention can achieve torque control without reverse gear by controlling the switching of the hybrid vehicle's operating mode.

[0089] Please refer to Figure 5The second aspect of the present invention also provides a vehicle controller 500, including: one or more processors 501, one or more input devices 502, one or more output devices 503 and one or more memories 504. The processor 501, input device 502, output device 503 and memory 504 communicate with each other through a communication bus 505. The memory 504 is used to store computer programs, and the computer program includes program instructions. The processor 501 is used to execute the program instructions stored in the memory 504. Among them, the processor 501 is configured to call the program instructions to execute the steps of the above-mentioned method embodiments. It should be understood that in the embodiment of the present invention, the processor 501 can be a central processing unit (CPU). The processor can also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general processor may be a microprocessor or the processor may be any conventional processor, etc. The input device 502 may include a touch panel, a fingerprint sensor (for collecting the user's fingerprint information and the direction information of the fingerprint), a microphone, etc., and the output device 503 may include a display (LCD, etc.), a speaker, etc. The memory 504 may include a read-only memory and a random access memory, and provide instructions and data to the processor 501. A portion of the memory 504 may also include a non-volatile random access memory. For example, the memory 504 may also store information about the device type. In a specific implementation, the processor 501, the input device 502, and the output device 503 described in the embodiment of the present invention may execute the implementation described in the first embodiment and the second embodiment of the torque control method for a hybrid vehicle provided in the embodiment of the present invention.

[0090] In the third aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, wherein the computer program includes program instructions, wherein the program instructions are executed by a processor to implement all or part of the processes in the above-mentioned embodiment method, and the computer program can also be completed by instructing the relevant hardware through the computer program, and the computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electric carrier signal and telecommunication signal.

[0091] The computer-readable storage medium may be an internal storage unit of the terminal of any of the foregoing embodiments, such as a hard disk or memory of the terminal. The computer-readable storage medium may also be an external storage device of the terminal, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the terminal. Further, the computer-readable storage medium may also include both an internal storage unit of the terminal and an external storage device. The computer-readable storage medium is used to store computer programs and other programs and data required by the terminal. The computer-readable storage medium may also be used to temporarily store data that has been output or is to be output.

[0092] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0093] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the vehicle controller described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0094] In the several embodiments provided in the present application, it should be understood that the disclosed terminals and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces or units, or it can be an electrical, mechanical or other form of connection.

[0095] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of the present invention.

[0096] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0097] A fourth aspect of the present invention further provides a hybrid vehicle, comprising the vehicle controller described above.

[0098] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A torque control method for a hybrid vehicle, characterized in that: include: Real-time detection of the current gear position of the hybrid vehicle and the vehicle state of the hybrid vehicle in the current gear position; determining a next operating mode of the hybrid vehicle in the current gear according to the vehicle state; requesting a clutch state from an automatic transmission control unit TCU of the hybrid vehicle according to the next operating mode; After the clutch state request is successful, requesting torque from the powertrain system of the hybrid vehicle according to the next operating mode; the torque includes positive torque and negative torque; The operating modes include series mode, parallel mode, pure electric rear-wheel drive mode and pure electric four-wheel drive mode; The step of requesting a clutch state from an automatic transmission control unit TCU of the hybrid vehicle according to the next operation mode includes: If the next operating mode is the operating mode of the hybrid vehicle in the P gear or the N gear, requesting the TCU to open the clutch; If the current gear position of the vehicle is the D gear or the R gear, requesting the clutch state from the automatic transmission control unit TCU of the hybrid vehicle according to the next operating mode; The requesting torque from the powertrain system of the hybrid vehicle according to the next operating mode includes: A power transmission mechanism that performs a driving function in the power transmission system is determined according to a next operation mode of the hybrid vehicle in the current gear, and torque is requested from the power transmission mechanism that performs the driving function.

2. The torque control method for a hybrid vehicle according to claim 1, characterized in that: The vehicle state of the hybrid vehicle in the current gear position includes the engine state of the hybrid vehicle in the current gear position; If the current gear is the R gear, determining the next operating mode of the hybrid vehicle in the current gear according to the vehicle state includes: If the engine state is a start state, determining that the next operation mode of the hybrid vehicle is a series mode; If the engine state is a shutdown state, it is determined that the next operating mode of the hybrid vehicle is a pure electric rear-drive mode.

3. The torque control method for a hybrid vehicle as claimed in claim 2, characterized in that: The power transmission system includes a P4 motor; if the current gear of the hybrid vehicle is the R gear, requesting torque from the power transmission system according to the next operating mode, including: If the next operation mode is the series mode, a negative driving torque is requested from the P4 motor, and a power generation torque is requested from other power mechanisms in the power transmission system except the P4 motor; If the next operating mode is the pure electric rear-wheel drive mode, negative driving torque is requested from the P4 motor.

4. The torque control method for a hybrid vehicle according to claim 1, characterized in that: The vehicle state of the hybrid vehicle in the current gear position includes the engine state and creeping state of the hybrid vehicle in the current gear position; if the current gear position of the hybrid vehicle is the D gear, determining the next operation mode of the hybrid vehicle in the current gear position according to the vehicle state includes: If the engine state is a start state and the creep state is an activated creep state, determining that the next operation mode of the hybrid vehicle is a series mode; If the engine state is a start state and the creep state is a non-activated creep state, determining that the next operation mode of the hybrid vehicle is a parallel mode; If the engine state is a shutdown state and the creep state is an activated creep state, determining that the next operation mode of the hybrid vehicle is a pure electric rear-drive mode; If the engine state is a shutdown state and the creep state is creep not activated, it is determined that the next operating mode of the hybrid vehicle is a pure electric four-wheel drive mode.

5. The torque control method for a hybrid vehicle as claimed in claim 4, characterized in that: The power transmission system includes a P2 motor and a P4 motor; if the current gear of the hybrid vehicle is the D gear, requesting torque from the power transmission system according to the next operating mode includes: If the next operation mode is the series mode, the P2 motor and the engine are respectively requested to generate power torque, and the P4 motor is requested to generate positive drive torque; If the next operation mode is the parallel mode, the P2 motor and the engine are respectively requested to provide a driving torque, and the P4 motor is requested to provide a positive driving torque; If the next operating mode is the pure electric rear-drive mode, forward drive torque is requested from the P4 motor; If the next operating mode is the pure electric four-wheel drive mode, a driving torque is requested from the P2 motor and a positive driving torque is requested from the P4 motor.

6. The torque control method for a hybrid vehicle according to any one of claims 4 or 5, characterized in that: The step of requesting a clutch state from an automatic transmission control unit TCU of the hybrid vehicle according to the next operation mode includes: If the next operating mode is the series mode in the D gear or the pure electric rear-drive mode in the D gear, requesting the TCU to open the clutch; If the next operating mode is the parallel mode in the D gear or the pure electric four-wheel drive mode in the D gear, the clutch is requested to close to the TCU.

7. A vehicle controller, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

8. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A hybrid vehicle, characterized in that: Including the vehicle controller as claimed in claim 7.

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