Method for distributing torque of vehicle, non-volatile storage medium and vehicle

Abstract

The application discloses a vehicle torque distribution method, a nonvolatile storage medium and a vehicle. The method comprises the following steps: acquiring a current state parameter of the vehicle when the vehicle is in a running state; determining a target torque distribution mode based on the current state parameter, wherein the target torque distribution mode comprises at least one of the following: an idle mode, a driving power generation mode, a driving assistance mode, a fast acceleration mode and an energy recovery mode; and distributing torque of a motor and / or an engine of the vehicle based on the target torque distribution mode. The application solves the technical problem of low torque distribution efficiency in the related art.

Description

Technical Field

[0001] This invention relates to the field of vehicle control, and more specifically, to a method for distributing vehicle torque, a non-volatile storage medium, and a vehicle. Background Technology

[0002] Hybrid vehicles primarily derive power from an electric drive system and an engine. Based on coordinated torque distribution control between the electric motor and engine, they can not only achieve greater drive torque output but also optimize the engine's operating range, ultimately reducing fuel consumption and emissions, thus achieving energy conservation and emission reduction goals. Current related technologies mainly consider the needs of the power system's input shaft, distributing and controlling torque increase and decrease based on target commands to ensure that the actual torque on the input shaft matches the target torque. However, this approach is relatively simplistic and has low torque distribution efficiency.

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

[0004] This invention provides a method for distributing vehicle torque, a non-volatile storage medium, and a vehicle, to at least solve the technical problem of low efficiency in torque distribution in related technologies.

[0005] According to one aspect of the present invention, a method for distributing vehicle torque is provided, comprising: acquiring current state parameters of the vehicle while the vehicle is in a driving state; determining a target torque distribution mode based on the current state parameters, wherein the target torque distribution mode includes at least one of the following: idling mode, driving power generation mode, driving assist mode, rapid acceleration mode, and energy recovery mode; and distributing torque to the vehicle's motor and / or engine based on the target torque distribution mode.

[0006] Optionally, determining the target torque distribution mode based on the current state parameters includes: obtaining the current torque distribution mode of the vehicle; and switching the current torque distribution mode to the target torque distribution mode based on the current state parameters in response to the current state parameters satisfying the torque switching conditions of the current torque distribution mode.

[0007] Optionally, the idling mode includes: an idling power generation state, wherein when the target torque distribution mode is idling mode, torque distribution is performed on the vehicle's motor and / or engine based on the target torque distribution mode, including: acquiring motor state parameters of the motor and engine state parameters of the engine; determining the power unit for speed control from the motor and engine based on the motor state parameters and engine state parameters, and acquiring the power generation power of the power unit; and determining the target torque of the power unit based on the power generation power of the power unit.

[0008] Optionally, determining the target torque of the power unit based on its power generation capacity includes: adjusting the power generation capacity based on the vehicle's battery charge to obtain the adjusted power generation capacity; and determining the target torque of the power unit based on the adjusted power generation capacity.

[0009] Optionally, the idle mode includes: when the idle pedal is triggered, and the target torque distribution mode is idle mode, torque distribution is performed on the vehicle's motor and / or engine based on the target torque distribution mode, including: adjusting the current torque of the engine based on a preset engine torque change rate to obtain the engine torque, and adjusting the current torque of the motor based on a preset motor torque change rate to obtain the motor torque, wherein the motor torque change rate is less than the engine torque change rate.

[0010] Optionally, when the target torque distribution mode is the driving power generation mode, torque distribution is performed on the vehicle's motor and / or engine based on the target torque distribution mode, including: obtaining the vehicle's required torque and current speed; determining the preset torque range to which the required torque belongs; determining the engine torque based on the current speed using the preset torque range; and determining the motor torque based on the required torque and engine torque.

[0011] Optionally, determining the engine torque based on the current speed using a preset torque range includes: in response to the required torque being within a first preset torque range, determining the engine torque based on the current speed using a first correspondence, wherein the first correspondence represents the correspondence between torque and speed under a first fuel consumption condition; in response to the required torque being within a second preset torque range, determining the engine torque based on the current speed using a second correspondence, wherein the second correspondence represents the correspondence between torque and speed under a second fuel consumption condition; and in response to the required torque being within a third preset torque range, determining the required torque as the engine torque.

[0012] Optionally, when the target torque distribution mode is driving assistance mode, torque distribution is performed on the vehicle's motor and / or engine based on the target torque distribution mode, including: determining the required torque as engine torque in response to the vehicle's required torque being less than or equal to the engine torque upper limit; determining the engine torque upper limit as engine torque in response to the required torque being greater than the engine torque upper limit; and determining the motor torque based on the required torque and the engine torque.

[0013] Optionally, when the target torque distribution mode is the rapid acceleration mode, torque distribution is performed on the vehicle's motor and / or engine based on the target torque distribution mode, including: obtaining the current torque of the engine; determining the required torque as the engine torque in response to the vehicle's required torque being less than the engine's external characteristic torque, wherein the engine's external characteristic torque is used to represent the torque generated as the engine speed changes when the engine speed reaches a preset power; determining the upper limit of the engine torque as the engine torque in response to the required torque being greater than the engine's external characteristic torque; and determining the motor torque based on the required torque and the current torque.

[0014] Optionally, when the target torque distribution mode is energy recovery mode, torque distribution is performed on the vehicle's motor and / or engine based on the target torque distribution mode, including: determining a preset value as engine torque; and determining motor torque based on the vehicle's required torque and engine torque.

[0015] According to another aspect of the present invention, a non-volatile storage medium is also provided, the non-volatile storage medium including a stored program, wherein, when the program is executed, it controls the processor of the device to execute the vehicle torque distribution method described above.

[0016] According to another aspect of the present invention, a vehicle is also provided, characterized in that it includes: one or more processors; a storage device for storing one or more programs; and a method for distributing vehicle torque as described above, wherein when the one or more programs are executed by the one or more processors, the one or more processors perform the method for distributing vehicle torque as described above.

[0017] According to another aspect of the present invention, a processor is also provided, which is used to run a program, wherein the program executes the above-described vehicle torque distribution method during runtime.

[0018] In this embodiment of the invention, when the vehicle is in motion, the current state parameters of the vehicle are acquired; a target torque distribution mode is determined based on the current state parameters; and torque is distributed to the vehicle's motor and / or engine based on the target torque distribution mode. It should be noted that the target torque distribution mode includes at least one of the following: idling mode, driving power generation mode, driving assist mode, rapid acceleration mode, and energy recovery mode. Through the above method, different torque distribution modes are adopted according to different driving states of the vehicle, achieving the purpose of determining a torque distribution mode suitable for different driving states, thereby improving the efficiency of torque distribution under different driving states, and thus solving the technical problem of low torque distribution efficiency in related technologies. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0020] Figure 1 This is a flowchart of a vehicle torque distribution method according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of a torque distribution control architecture according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of a switching control between various torque distribution modes according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of an idle mode sub-function switching control according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the division of the vehicle power generation torque distribution area according to an embodiment of the present invention;

[0025] Figure 6 This is a flowchart of torque distribution control in a driving assistance mode according to an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of a hybrid vehicle powertrain configuration according to an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of a vehicle torque distribution device according to an embodiment of the present invention. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] Example 1

[0031] According to an embodiment of the present invention, a method for distributing vehicle torque is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0032] Figure 1 This is a flowchart of a vehicle torque distribution method according to an embodiment of the present invention, such as... Figure 1 As shown, the method includes the following steps:

[0033] Step S102: When the vehicle is in motion, obtain the current state parameters of the vehicle.

[0034] The driving status can be understood as the state of the vehicle when the engine is running, which may include, but is not limited to, acceleration, deceleration, reversing, and turning. The current status parameters can be understood as the configuration parameters of the vehicle in its current state, which may include, but are not limited to, the vehicle's gear position, accelerator pedal position, vehicle speed, transmission torque, and battery charge.

[0035] In one alternative embodiment, the current state parameters of the vehicle can be obtained through sensors, such as a speed sensor to obtain the vehicle speed and a torque sensor to obtain the transmission torque.

[0036] Step S104: Determine the target torque distribution mode based on the current state parameters. The target torque distribution mode includes at least one of the following: idle mode, driving power generation mode, driving assist mode, fast acceleration mode, and energy recovery mode.

[0037] Among them, the target torque distribution mode can be understood as the most suitable torque distribution mode determined according to the current state of the vehicle; the idle mode can be understood as the working state of the engine running at idle speed. When the accelerator pedal is completely released while the engine is running, the vehicle is in the idle mode; the driving power generation mode can be understood as the mode in which the engine not only drives the vehicle to move, but also drives the motor to generate electricity when the vehicle is driving normally; the driving assistance mode can be understood as the mode in which, when the engine's ability to drive the vehicle is insufficient, part of the power needs to be provided by the motor; the fast acceleration mode can be understood as the mode in which the vehicle speed increases rapidly in a short period of time; and the energy recovery mode can be understood as the mode in which the kinetic energy of the car is converted into electrical energy.

[0038] Specifically, the current driving mode of the vehicle can be determined by the vehicle's current state parameters, and then the corresponding target torque distribution mode can be determined.

[0039] Understandably, by determining the target torque distribution mode based on the current state parameters, different target torque distribution modes can be allocated according to different needs during vehicle operation, thereby achieving effective control over the torque distribution of the power source.

[0040] Step S106: Distribute torque to the vehicle's motor and / or engine based on the target torque distribution mode.

[0041] Torque distribution can be understood as the process of distributing the torque required for vehicle operation to the electric motor and / or engine according to certain rules.

[0042] In one alternative embodiment, torque distribution can be achieved through a vehicle control unit (HCU), which controls the distribution of the required torque of the transmission input shaft according to the current torque distribution mode of the vehicle, in order to ensure the stability of the vehicle and the reliability of its driving functions.

[0043] Figure 2 This is a schematic diagram of a torque distribution control architecture according to an embodiment of the present invention, as shown below. Figure 2 As shown, the torque distribution control module includes torque distribution control in idle mode, driving power generation mode, driving assist mode, rapid acceleration mode, and energy recovery mode.

[0044] Through the above steps, while the vehicle is in motion, its current state parameters are acquired. Based on these parameters, a target torque distribution mode is determined, and torque is distributed to the vehicle's motor and / or engine according to this mode. It should be noted that the target torque distribution mode includes at least one of the following: idling mode, driving power generation mode, driving assistance mode, rapid acceleration mode, and energy recovery mode. By employing this method, different torque distribution modes are adopted according to different driving states, achieving the goal of determining a suitable torque distribution mode for different driving states. This improves the efficiency of torque distribution under different driving states and solves the technical problem of low efficiency in related torque distribution methods.

[0045] Optionally, determining the target torque distribution mode based on the current state parameters includes: obtaining the current torque distribution mode of the vehicle; and switching the current torque distribution mode to the target torque distribution mode based on the current state parameters in response to the current state parameters satisfying the torque switching conditions of the current torque distribution mode.

[0046] The current torque distribution mode can be understood as the torque distribution mode currently used by the vehicle, and the torque switching condition can be understood as the condition for exiting the current torque distribution mode.

[0047] It should be noted that after the current state parameters meet the requirements of the current torque distribution mode, the specific mode to switch to can be determined based on the vehicle's current state parameters.

[0048] Figure 3 This is a schematic diagram of a switching control between various torque distribution modes according to an embodiment of the present invention, such as... Figure 3 As shown, when condition 1 is met, the idle mode can be switched to any one of the following modes: driving power generation mode, driving assistance mode, rapid acceleration mode, and energy recovery mode, depending on the actual situation. When condition 2 is met, the driving power generation mode, driving assistance mode, rapid acceleration mode, and energy recovery mode can be switched back to idle mode. When condition 3 is met, the energy recovery mode can be switched to any one of the following modes: driving power generation mode, driving assistance mode, and rapid acceleration mode. When condition 4 is met, the driving power generation mode, driving assistance mode, and rapid acceleration mode can be switched back to energy recovery mode. When condition 5 is met, the driving power generation mode and driving assistance mode can be switched back to rapid acceleration mode. When condition 6 is met, the rapid acceleration mode can be switched back to any one of the following modes: driving power generation mode and driving assistance mode. When condition 7 is met, the driving power generation mode can be switched back to driving assistance mode. When condition 8 is met, the driving assistance mode can be switched back to driving power generation mode.

[0049] Specifically, condition 1 can be: when the vehicle is in D or R, the driver depresses the accelerator pedal, and the accelerator pedal travel exceeds a specified value; condition 2 can be: when the vehicle is in P or N and is stationary, or when the driver releases the accelerator pedal and enters crawl mode in D or R; condition 3 can be: the driver depresses the accelerator pedal and the transmission input shaft requires a torque greater than a specified value; condition 4 can be: the driver releases the accelerator pedal and the transmission input shaft requires a torque less than a specified value; condition 5 can be: the vehicle is undergoing rapid acceleration or the transmission input shaft requires a large torque, and the current high-voltage battery has a remaining charge (State of...). Charge (SOC) is higher than the specified value; Condition 6 can be: the vehicle exits the rapid acceleration process and the transmission input shaft requires very little torque, or the current high-voltage battery SOC is lower than the specified value, that is, the charge is too low to continue to maintain the motor's rapid compensation assist; Condition 7 can be: the current high-voltage battery SOC is higher than the lower limit of the charge required by the driving assist mode; Condition 8 can be: the current high-voltage battery SOC is lower than the upper limit of the charge required by the driving power generation mode; The HCU should output the corresponding engine and motor torque demand commands according to the current torque distribution mode of the vehicle's power system to achieve the purpose of power source torque distribution.

[0050] Optionally, the idling mode includes: an idling power generation state, wherein when the target torque distribution mode is idling mode, torque distribution is performed on the vehicle's motor and / or engine based on the target torque distribution mode, including: acquiring motor state parameters of the motor and engine state parameters of the engine; determining the power unit for speed control from the motor and engine based on the motor state parameters and engine state parameters, and acquiring the power generation power of the power unit; and determining the target torque of the power unit based on the power generation power of the power unit.

[0051] Here, "idle power generation state" can be understood as the state in which the engine or motor is under speed control. "Motor state parameters" can be understood as parameters used to characterize the working state of the motor, including but not limited to: motor power generation torque, motor available continuous charging power, battery continuous charging power, etc. "Engine state parameters" can be understood as parameters used to characterize the working state of the engine, including but not limited to: engine coolant temperature, etc. "Power unit" can be understood as a device that controls the speed of the motor and engine. "Power generation power" can be understood as the rated amount of electricity generated in one hour. "Target torque" can be understood as the torque that the motor and engine need to achieve in the current idle power generation state.

[0052] Specifically, in the idle power generation function mode, the HCU coordinates to set or define the implementation party of the speed control function. When the following conditions are met, the motor should perform speed control: the motor's power generation torque capacity is not limited, the motor's available continuous charging power capacity is not limited, the battery's continuous charging power capacity is not limited, the engine has warmed up, and the water temperature is greater than 40 degrees Celsius. If the above conditions are not met, the engine should perform speed control.

[0053] In an optional embodiment, the motor state parameters of the motor and the engine state parameters of the engine can be obtained through sensors.

[0054] Optionally, determining the target torque of the power device based on the power generation power of the power device includes: adjusting the power generation power based on the battery charge of the vehicle to obtain the adjusted power generation power; determining the target torque of the power device based on the adjusted power generation power.

[0055] Among them, the adjusted power generation power can be understood as the power generation power after adjusting the current power generation power according to the level of the current battery charge of the vehicle.

[0056] Specifically, in the idle power generation state, the HCU should set the power generation power value. When the battery charge is low (e.g., less than 30%), the power generation power can be set to 5 kW or other appropriate values, which are not limited in this invention. When the battery charge is high, but the engine water temperature is less than 35 degrees Celsius and the engine is in the warm-up process, the power generation power can be set to 3 kW or other appropriate values, which are not limited in this invention. In the idle power generation function mode, setting the power generation power has a certain relationship with the noise, vibration, and harshness (NVH) of the vehicle, and it can be set according to comprehensive factors such as NVH. In addition, to avoid excessive load on the engine or the motor, the HCU needs to set the power generation power in the idle power generation state not to exceed a specified value (e.g., 8 kW or other appropriate values, which are not limited in this invention). In the idle power generation state, the HCU limits the rising rate / slope of the torque commands sent to the motor and the engine to ensure the minimum speed fluctuation and vibration during the power generation process. The torque command rising slope value < T1, and T1 can be 200 Nm / s.

[0057] Optionally, the idle mode includes: the idle pedal trigger state. In the case where the target torque distribution mode is the idle mode, torque distribution to the motor and / or engine of the vehicle is performed based on the target torque distribution mode, including: adjusting the current torque of the engine based on a preset engine torque change rate to obtain the engine torque, and adjusting the current torque of the motor based on a preset motor torque change rate to obtain the motor torque, where the motor torque change rate is less than the engine torque change rate.

[0058] Among them, the preset engine torque change rate can be understood as a pre - preset engine torque change rate for meeting the driver's demands. The engine torque can be understood as the torque adjusted based on the preset engine torque change rate for the current torque of the engine and suitable for the current trigger state of the idle pedal. The preset motor torque change rate can be understood as a pre - preset motor torque change rate for meeting the driver's demands. The motor torque can be understood as the torque adjusted based on the preset motor torque change rate for the current torque of the motor and suitable for the current trigger state of the idle pedal.

[0059] It can be understood that in the trigger state of the idle pedal, the HCU should set a relatively fast engine torque change rate / rising slope (such as 300 Nm / s or other appropriate values, which are not limited in this invention), and the HCU should set a relatively gentle motor generating torque change rate (such as - 150 Nm / s or other appropriate values, which are not limited in this invention) to ensure the smoothness of the rotational speed and the power generation process. Therefore, it is necessary that the motor torque change rate is less than the engine torque change rate.

[0060] Specifically, in the idle power generation state, if the driver steps on the accelerator pedal, the HCU should set the response rate of the engine speed rising and falling to meet the driver's demands. The rising slope value of the speed command < N1, and N1 can be 2000 rpm / s; the falling slope value of the speed command > N2, and N2 can be - 2000 rpm / s. In the idle power generation state, if the driver steps on the accelerator pedal, the HCU should design the corresponding power generation power according to the SOC of the high - voltage battery (such as 10 kW or other appropriate values, which are not limited in this invention) to avoid the low power of the high - voltage battery. In the trigger state of the idle pedal, the HCU should set that the maximum engine speed shall not exceed the specified value (such as ३००० rpm or other appropriate values, which are not limited in this invention) to avoid the excessive or over - heated engine speed when the vehicle accelerates shortly.

[0061] Figure 4 is a schematic diagram of the switching control of the idle - mode sub - functions according to an embodiment of the present invention, as Figure 4 shown, the idle mode includes two sub - functions: idle power generation and idle pedal trigger. Among them, the idle power generation can be the above - mentioned idle power generation state, and the idle pedal trigger can be the above - mentioned idle pedal trigger state. The idle power generation means that when one of the engine or the motor is in the rotational speed control mode and the other is in the torque control mode, the power generation function of the power system is realized in the parking state; the idle pedal trigger means the engine speed rising control function when the driver steps on the accelerator pedal in the P or N gear. The switching control method between the two idle sub - functions, as Figure 4As shown, the specific control method is as follows: When the driver presses the accelerator pedal to the specified value, the HCU controls the power system to enter the idle pedal trigger control sub-function; when the driver releases the pedal or the engine speed is lower than the idle target speed, the HCU controls the power system to enter the idle power generation control sub-function.

[0062] Optionally, when the target torque distribution mode is the driving power generation mode, torque distribution is performed on the vehicle's motor and / or engine based on the target torque distribution mode, including: obtaining the vehicle's required torque and current speed; determining the preset torque range to which the required torque belongs; determining the engine torque based on the current speed using the preset torque range; and determining the motor torque based on the required torque and engine torque.

[0063] Here, the required torque can be understood as the torque required by the input shaft of the vehicle's transmission, the current speed can be understood as the current speed of the vehicle's motor and / or engine, and the preset torque range can be understood as a range that is preset in advance and determined based on the required torque.

[0064] In an alternative embodiment, the required torque and current speed of the vehicle can be obtained using a torque sensor and a speed sensor.

[0065] Figure 5 This is a schematic diagram illustrating the division of the vehicle's power generation torque distribution area according to an embodiment of the present invention, as shown below. Figure 5 As shown, in driving power generation mode, the HCU needs to divide the torque region into three areas: region A, region B, and region C, based on the required torque of the transmission input shaft. The area between curve 1 and curve 2 represents the engine's fuel-efficient zone, where curve 1 is the lower limit and curve 2 is the upper limit. When the required torque at the transmission input is less than the torque represented by curve 1, it can be classified into region A; when the required torque at the transmission input is greater than the torque represented by curve 1 but less than the torque represented by curve 2, it can be classified into region B; and when the required torque at the transmission input is greater than the torque represented by curve 2, it can be classified into region C.

[0066] Optionally, determining the engine torque based on the current speed using a preset torque range includes: in response to the required torque being within a first preset torque range, determining the engine torque based on the current speed using a first correspondence, wherein the first correspondence represents the correspondence between torque and speed under a first fuel consumption condition; in response to the required torque being within a second preset torque range, determining the engine torque based on the current speed using a second correspondence, wherein the second correspondence represents the correspondence between torque and speed under a second fuel consumption condition; and in response to the required torque being within a third preset torque range, determining the required torque as the engine torque.

[0067] In this embodiment, the first preset torque range can be understood as a range of smaller values ​​preset in advance. In this embodiment, the first preset torque range corresponds to the aforementioned region A. The first correspondence can be understood as the correspondence between torque and speed of the vehicle under the fuel consumption of the first preset torque range. The first fuel consumption condition can be understood as the fuel consumption under the first preset torque range. The second preset torque range can be understood as a range of intermediate values ​​preset in advance. In this embodiment, the second preset torque range corresponds to the aforementioned region B. The second correspondence can be understood as the correspondence between torque and speed of the vehicle under the fuel consumption of the second preset torque range. The second fuel consumption condition can be understood as the fuel consumption under the second preset torque range. The third preset torque range can be understood as a range of larger values ​​preset in advance. In this embodiment, the third preset torque range corresponds to the aforementioned region C.

[0068] Specifically, in driving power generation mode, the HCU should perform torque distribution control according to the region where the required torque at the transmission input is located.

[0069] When the required torque is in region A, in order to ensure economy, the HCU uses a control strategy to keep the engine in the aforementioned range. Figure 5 Running on curve 1, the torque distribution is as follows: engine torque = f(speed, curve 1 torque), that is, the torque of curve 1 is obtained through engine speed; motor generating torque = demand torque - engine torque.

[0070] It should be noted that the required torque at the transmission input is a known quantity that can be calculated using factors such as the accelerator pedal and vehicle speed. The engine speed can be used to calculate the corresponding RPM, and then the engine torque (as shown on curve 1) can be obtained by referring to a table. The engine outputs positive torque, while the electric motor generates negative torque; the sum of these two is the transmission input shaft torque, which meets the vehicle's driving requirements.

[0071] When the required torque is in region B, in order to ensure economy, the HCU uses a control strategy to keep the engine in the aforementioned range. Figure 5 The torque is distributed as follows on curve 2: engine torque = f(speed, curve 2 torque), that is, the torque of curve 2 is obtained through engine speed; motor generating torque = demand torque - engine torque.

[0072] When the required torque is in region C, the torque distribution is as follows: engine torque = required torque; motor generating torque = 0; in driving power generation mode, the HCU should be set to a relatively slow rate of change of motor generating torque (e.g., -100 Nm / s) to ensure the smoothness of the power generation process.

[0073] It should be noted that the rate / slope of change of engine torque is generally a positive value, while the rate / slope of change of generator torque is generally a negative value.

[0074] Optionally, when the target torque distribution mode is driving assistance mode, torque distribution is performed on the vehicle's motor and / or engine based on the target torque distribution mode, including: determining the required torque as engine torque in response to the vehicle's required torque being less than or equal to the engine torque upper limit; determining the engine torque upper limit as engine torque in response to the required torque being greater than the engine torque upper limit; and determining the motor torque based on the required torque and the engine torque.

[0075] The upper limit of engine torque can be understood as the maximum torque of the engine.

[0076] Specifically, in driving assistance mode, the HCU should control torque distribution based on the engine torque external characteristics (engine torque upper limit) and in the following manner.

[0077] When the required torque of the transmission input shaft is less than or equal to the upper limit of the engine torque, then the engine torque = required torque; the motor drive torque = 0. When the required torque of the transmission input shaft is greater than the upper limit of the engine torque, then the engine torque = the upper limit of the engine torque; the motor drive torque = required torque - upper limit of the engine torque.

[0078] Understandably, in driving assistance mode, the HCU should limit the rate of change of the motor drive torque (e.g., 200 Nm / s) to avoid causing driving shocks too quickly, so as to ensure the smooth operation of the vehicle.

[0079] Figure 6 This is a flowchart of torque distribution control in a driving assistance mode according to an embodiment of the present invention, such as... Figure 6 As shown, the specific process is as follows:

[0080] Step S601: Set the engine warm-up flag to 0;

[0081] Step S602: Determine whether the required torque is greater than curve 2; if yes, proceed to step S603; if no, proceed to step S607.

[0082] Step S603, if yes, then control the engine torque output to f(speed, curve 2);

[0083] Step S604: Control the motor torque output to be the difference between the required torque and the engine torque output;

[0084] Step S605: Perform slope change processing on the engine torque output;

[0085] Step S606: Perform slope change processing on the motor torque output;

[0086] If not, in step S607, control the engine torque output to the torque required by the driver and execute steps S605 and S606 above.

[0087] Step S608: Control the motor torque output to 0.

[0088] Optionally, when the target torque distribution mode is the rapid acceleration mode, torque distribution is performed on the vehicle's motor and / or engine based on the target torque distribution mode, including: obtaining the current torque of the engine; determining the required torque as the engine torque in response to the vehicle's required torque being less than the engine's external characteristic torque, wherein the engine's external characteristic torque is used to represent the torque generated as the engine speed changes when the engine speed reaches a preset power; determining the upper limit of the engine torque as the engine torque in response to the required torque being greater than the engine's external characteristic torque; and determining the motor torque based on the required torque and the current torque.

[0089] Among them, the external characteristic torque of the engine can be understood as the torque generated under the full load speed characteristics of the engine.

[0090] Specifically, in the acceleration mode where the accelerator is pressed quickly, when the engine torque cannot meet the driver's demand for rapid torque increase due to response lag or limitations imposed by external torque characteristics, the advantages of the electric motor can be fully utilized to perform rapid drive torque compensation during driving, thereby improving the vehicle's power response performance. That is, when the driver presses the accelerator quickly, the electric motor performs rapid torque compensation. In this mode, torque distribution control is performed according to the following method.

[0091] When the required torque of the transmission input shaft is less than the external characteristic torque capacity of the engine, then the engine torque = required torque; the electric motor drive torque = required torque - the current actual drive torque of the engine.

[0092] It should be noted that the engine's current actual driving torque is obtained in real time from the EMS by the HCU through the Controller Area Network (CAN). This value is different from the engine torque, which is the command calculated by the HCU through torque distribution control; it is the torque that the HCU requests the EMS to output. The engine's current actual driving torque can be considered as the actual value responded by the EMS.

[0093] When the required torque of the transmission input shaft is greater than the external characteristic torque capacity of the engine, then the engine torque = the upper limit of the engine torque; the electric motor drive torque = the required torque - the current actual drive torque of the engine.

[0094] Understandably, in fast acceleration mode, the HCU should be set to a faster rate of change of the drive torque of the electric motor and engine (e.g., 300 Nm / s) to meet the requirements of vehicle power performance.

[0095] Optionally, when the target torque distribution mode is energy recovery mode, torque distribution is performed on the vehicle's motor and / or engine based on the target torque distribution mode, including: determining a preset value as engine torque; and determining motor torque based on the vehicle's required torque and engine torque.

[0096] The preset value can be the torque value output by the engine in energy recovery mode, which can be preset in advance. For example, it can be 0. This invention does not limit this.

[0097] Specifically, when the driver releases the accelerator pedal or presses the brake pedal, the vehicle enters the energy recovery mode. In this mode, the torque distribution control is such that the recovered torque is borne by the motor. The HCU distributes the calculated negative torque to the motor, the engine output torque is 0, that is, the engine torque = 0, and the motor generating torque = the required torque (recovered negative torque).

[0098] Figure 7 This is a schematic diagram of a hybrid vehicle powertrain configuration according to an embodiment of the present invention, such as... Figure 7 As shown, the power system mainly consists of assemblies such as an engine, drive motor, power battery pack, gearbox, clutch, and transmission mechanism. It also includes controllers corresponding to each assembly, including the engine management system (EMS), vehicle control unit (HCU), motor control unit (MCU), battery management system (BMS), and transmission control unit (TCU). The controllers communicate with each other through a CAN network.

[0099] Example 2

[0100] According to another aspect of the present invention, a vehicle torque distribution device is also provided. This device can perform the vehicle torque distribution method in Embodiment 1 above. The specific implementation scheme and application scenario in this embodiment are the same as those in Embodiment 1 above, and will not be described again here.

[0101] Figure 8 This is a schematic diagram of a vehicle torque distribution device according to an embodiment of the present invention, such as... Figure 8As shown, the device includes: a parameter acquisition module 802, used to acquire the current state parameters of the vehicle when the vehicle is in motion; a mode determination module 804, used to determine a target torque distribution mode based on the current state parameters, wherein the target torque distribution mode includes at least one of the following: idle mode, driving power generation mode, driving assist mode, rapid acceleration mode, and energy recovery mode; and a torque distribution module 806, used to distribute torque to the vehicle's motor and / or engine based on the target torque distribution mode.

[0102] The mode determination module 804 includes: a mode acquisition unit for acquiring the current torque distribution mode of the vehicle; and a mode switching unit for switching the current torque distribution mode to the target torque distribution mode based on the current state parameters in response to the torque switching conditions that the current state parameters meet the current torque distribution mode.

[0103] The aforementioned idling mode includes: idling power generation state. When the target torque distribution mode is idling mode, torque distribution is performed on the vehicle's motor and / or engine based on the target torque distribution mode, including: acquiring the motor state parameters and engine state parameters; determining the power unit used for speed control from the motor and engine based on the motor state parameters and engine state parameters, and acquiring the power generation power of the power unit; and determining the target torque of the power unit based on the power generation power of the power unit.

[0104] The target torque of the power unit can be determined based on its power generation capacity by the following method: adjusting the power generation capacity based on the vehicle's battery charge to obtain the adjusted power generation capacity; and determining the target torque of the power unit based on the adjusted power generation capacity.

[0105] The aforementioned idle mode includes: when the idle pedal is triggered, and the target torque distribution mode is idle mode, torque distribution is performed on the vehicle's motor and / or engine based on the target torque distribution mode, including: adjusting the current torque of the engine based on a preset engine torque change rate to obtain the engine torque, and adjusting the current torque of the motor based on a preset motor torque change rate to obtain the motor torque, wherein the motor torque change rate is less than the engine torque change rate.

[0106] When the target torque distribution mode is the vehicle power generation mode, the torque distribution of the vehicle's motor and / or engine is performed based on the target torque distribution mode, including: obtaining the vehicle's required torque and current speed; determining the preset torque range to which the required torque belongs; determining the engine torque based on the current speed using the preset torque range; and determining the motor torque based on the required torque and engine torque.

[0107] Determining engine torque based on the current speed using a preset torque range can be achieved by the following method: In response to the required torque being within a first preset torque range, the engine torque is determined based on the current speed using a first correspondence, where the first correspondence represents the relationship between torque and speed under a first fuel consumption condition; In response to the required torque being within a second preset torque range, the engine torque is determined based on the current speed using a second correspondence, where the second correspondence represents the relationship between torque and speed under a second fuel consumption condition; In response to the required torque being within a third preset torque range, the required torque is determined as the engine torque.

[0108] When the target torque distribution mode is driving assistance mode, torque distribution is performed on the vehicle's motor and / or engine based on the target torque distribution mode, including: determining the required torque as engine torque in response to the vehicle's required torque being less than or equal to the engine torque upper limit; determining the engine torque upper limit as engine torque in response to the required torque being greater than the engine torque upper limit; and determining the motor torque based on the required torque and the engine torque.

[0109] When the target torque distribution mode is the rapid acceleration mode, torque distribution is performed on the vehicle's motor and / or engine based on the target torque distribution mode, including: obtaining the current torque of the engine; determining the required torque as the engine torque in response to the vehicle's required torque being less than the engine's external characteristic torque, wherein the engine's external characteristic torque is used to represent the torque generated as the engine speed changes when the engine speed reaches a preset power; determining the upper limit of the engine torque as the engine torque in response to the required torque being greater than the engine's external characteristic torque; and determining the motor torque based on the required torque and the current torque.

[0110] When the target torque distribution mode is energy recovery mode, the torque distribution of the vehicle's motor and / or engine is performed based on the target torque distribution mode, including: determining the preset value as the engine torque; and determining the motor torque based on the vehicle's required torque and the engine torque.

[0111] Example 3

[0112] According to another aspect of the present invention, a non-volatile storage medium is also provided, characterized in that the non-volatile storage medium includes a stored program, wherein, when the program is executed, it controls the execution of the vehicle torque distribution method of any one of claims 1 to 8 in the processor of the device.

[0113] Example 4

[0114] According to another aspect of the present invention, a vehicle is also provided, characterized in that it includes: one or more processors; a storage device for storing one or more programs; and when the one or more programs are executed by the one or more processors, causing the one or more processors to perform the vehicle torque distribution method of any one of claims 1 to 8.

[0115] Example 5

[0116] According to another aspect of the present invention, a processor is also provided, which is used to run a program, wherein the program executes the above-described vehicle torque distribution method during runtime.

[0117] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0118] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0119] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0120] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0121] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0122] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0123] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method of distributing torque in a vehicle, characterized by, include: When the vehicle is in motion, obtain the current state parameters of the vehicle; The target torque distribution mode is determined based on the current state parameters, wherein the target torque distribution mode includes at least one of the following: idle mode, driving power generation mode, driving assist mode, fast acceleration mode, and energy recovery mode; The torque is distributed to the vehicle's motor and / or engine based on the target torque distribution mode; The idle mode includes an idle pedal triggered state, where the idle pedal triggered state refers to the engine speed increase control function when the driver presses the accelerator pedal in P or N gear. When the target torque distribution mode is the idle mode in the idle pedal triggered state, torque distribution is performed on the vehicle's motor and / or engine based on the target torque distribution mode, including: adjusting the current torque of the engine based on a preset engine torque change rate to obtain engine torque, and adjusting the current torque of the motor based on a preset motor torque change rate to obtain motor torque, wherein the motor torque change rate is less than the engine torque change rate.

2. The vehicle torque distribution method according to claim 1, characterized by, Determining the target torque distribution mode based on the current state parameters includes: Obtain the current torque distribution mode of the vehicle; In response to the current state parameters satisfying the torque switching conditions of the current torque distribution mode, the current torque distribution mode is switched to the target torque distribution mode based on the current state parameters.

3. The method of claim 1, wherein, The idling mode includes: an idling power generation state. When the target torque distribution mode is the idling power generation state within the idling mode, torque distribution is performed on the vehicle's electric motor and / or engine based on the target torque distribution mode, including: Obtain the motor status parameters of the motor and the engine status parameters of the engine; Based on the motor state parameters and the engine state parameters, the power unit used for speed control is determined from the motor and the engine, and the power generation power of the power unit is obtained. The target torque of the power unit is determined based on the power generation capacity of the power unit.

4. The vehicle torque distribution method according to claim 3, characterized by, Determining the target torque of the power unit based on its power generation capacity includes: The power generation capacity is adjusted based on the battery charge of the vehicle to obtain the adjusted power generation capacity; The target torque of the power unit is determined based on the adjusted power generation.

5. The method of claim 1, wherein When the target torque distribution mode is the driving power generation mode, torque distribution is performed on the vehicle's motor and / or engine based on the target torque distribution mode, including: Obtain the required torque and current speed of the vehicle; Determine the preset torque range to which the required torque belongs; The engine torque is determined based on the current speed using the preset torque range; The motor torque is determined based on the required torque and the engine torque.

6. The vehicle torque distribution method according to claim 5, characterized by, Determining the engine torque based on the current speed using the preset torque range includes: In response to the demand torque being within a first preset torque range, the engine torque of the engine is determined based on the current speed using a first correspondence relationship, wherein the first correspondence relationship is used to represent the correspondence between torque and speed under the condition of satisfying a first fuel consumption. In response to the demand torque being within a second preset torque range, the engine torque of the engine is determined based on the current speed using a second correspondence relationship, wherein the second correspondence relationship is used to represent the correspondence between torque and speed under the condition of satisfying a second fuel consumption. In response to the demanded torque being within a third preset torque range, the demanded torque is determined to be the engine torque.

7. The method of claim 1, wherein When the target torque distribution mode is the driving assistance mode, torque distribution is performed on the vehicle's motor and / or engine based on the target torque distribution mode, including: In response to the vehicle's required torque being less than or equal to the engine torque upper limit, the required torque is determined to be the engine torque; In response to the demand torque being greater than the engine torque upper limit value, the engine torque upper limit value is determined to be the engine torque; The motor torque is determined based on the required torque and the engine torque.

8. A non-volatile storage medium, comprising: The non-volatile storage medium includes a stored program, wherein, when the program is executed, it controls the execution of the vehicle torque distribution method according to any one of claims 1 to 7 in the processor of the device.

9. A vehicle characterized by comprising: include: One or more processors; Storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors perform the vehicle torque distribution method according to any one of claims 1 to 7.

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