CN113859220A

CN113859220A - Vehicle torque distribution method, vehicle, and storage medium

Info

Publication number: CN113859220A
Application number: CN202010617173.3A
Authority: CN
Inventors: 吴光耀; 郭靖
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-12-31
Anticipated expiration: 2040-06-30
Also published as: CN113859220B

Abstract

The invention discloses a vehicle torque distribution method, a vehicle and a storage medium, wherein the vehicle comprises a front motor, a rear motor and an engine, and the vehicle torque distribution method comprises the following steps: acquiring the opening degree of an accelerator pedal, the vehicle speed and the current SOC value; obtaining the torque required by the driver according to the opening degree of an accelerator pedal and the vehicle speed; detecting an engine start; the driver demand torque is distributed to the front motor, the rear motor, and the engine according to the current SOC value, the vehicle speed, the engine economy torque, and the NVH limit torque. The method can improve the economy and NVH performance of the whole vehicle and reduce the oil consumption.

Description

Vehicle torque distribution method, vehicle, and storage medium

Technical Field

The present invention relates to the field of vehicle technologies, and in particular, to a vehicle torque distribution method, a non-transitory computer storage medium, and a vehicle.

Background

In the related technology, for the torque distribution of a hybrid electric vehicle, some schemes adopt an optimized and calculated dynamic torque distribution strategy based on the torque required by a driver and reasonably distribute the torque to an engine and a motor; some solutions make the braking deceleration constant by ensuring that the wheel-side resisting moment is consistent with the braking energy recovery function at the same brake pedal depth. However, in the above solutions, the required torque for the entire vehicle is obtained by analyzing the opening degree of the accelerator pedal, and the acceleration feeling is deteriorated at different vehicle speeds without considering the vehicle speed.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention aims to provide a vehicle torque distribution method which can improve the economy and NVH performance of a whole vehicle and reduce the oil consumption.

It is a further object of the present invention to provide a non-transitory computer storage medium.

The invention also aims to provide a vehicle.

In order to solve the above problem, a vehicle torque distribution method according to an embodiment of a first aspect of the present invention, a vehicle including a front motor, a rear motor, and an engine, includes: acquiring the opening degree of an accelerator pedal, the vehicle speed and the current SOC value; obtaining the torque required by the driver according to the opening degree of the accelerator pedal and the vehicle speed; detecting an engine start; distributing the driver-demanded torque to the front motor, the rear motor, and the engine according to the current SOC value, the vehicle speed, an engine economy torque, and an NVH limit torque.

According to the vehicle torque distribution method, the driver required torque is obtained based on the opening degree of the accelerator pedal and the vehicle speed, namely the required torque is obtained by considering the opening degree of the accelerator pedal and the vehicle speed, and compared with the method that the required torque is obtained by analyzing the opening degree of the accelerator pedal, the acceleration feeling under different vehicle speeds can be improved; and when the engine start is detected, distributing the driver required torque to the front motor, the rear motor and the engine according to the current SOC value, the vehicle speed, the engine economic torque and the NVH limit torque, namely, distributing the required torque by referring to the current SOC value in the method of the embodiment of the invention for the distribution of the vehicle torque, so that the engine does not need to be in a driving state all the time, the oil consumption is reduced, distributing the required torque by referring to the engine economic torque, the engine can be operated in an economic torque area within a proper range of the driver required torque, the economy of the whole vehicle is ensured, and the NVH performance can be improved by distributing the torque by referring to the NVH limit torque.

In some embodiments, distributing the driver demand torque to the front motor, the rear motor, and the engine according to the vehicle speed, the current SOC value, an engine economy torque, and an NVH limit torque includes: the current SOC value is larger than an expected SOC value, and the torque distribution proportion of the front motor and the rear motor is obtained according to the vehicle speed; obtaining a first target torque of the front motor and a second target torque of the rear motor according to the torque distribution ratio and the driver required torque; controlling output torques of the front motor, the rear motor, and the engine according to the first target torque, the second target torque, and the NVH limiting torque.

In some embodiments, controlling the output torques of the front motor, the rear motor, and the engine according to the first target torque, the second target torque, and the NVH limiting torque includes: and the first target torque is smaller than a first NVH (noise vibration and harshness) limit torque corresponding to the front motor, and the second target torque is smaller than a second NVH limit torque corresponding to the rear motor, so that the front motor is controlled to output the first target torque, the rear motor is controlled to output the second target torque, and the engine is controlled to operate in a power generation mode.

In some embodiments, controlling the output torques of the front motor, the rear motor, and the engine according to the first target torque, the second target torque, and the NVH limiting torque includes: the first target torque is larger than the first NVH limiting torque and/or the second target torque is larger than the second NVH limiting torque, a first exceeding torque that the first target torque exceeds the first NVH limiting torque and/or a second exceeding torque that the second target torque exceeds the second NVH limiting torque are calculated, a first compensation required torque is obtained according to the first exceeding torque and the second exceeding torque, the front motor is controlled to output the first target torque, the rear motor is controlled to output the second target torque, the engine is controlled to output the first compensation required torque, and a power generation mode is operated.

In some embodiments, distributing the driver demand torque to the front motor, the rear motor, and the engine according to the vehicle speed, the current SOC value, an engine economy torque, and an NVH limit torque includes: judging whether the current SOC value is not more than an expected SOC value or not, and judging whether the driver required torque is more than the engine economic torque or not; controlling the engine to output the driver required torque, the driver required torque being not greater than the engine economic torque; or, the driver demand torque is greater than the engine economy torque, the engine is controlled to output the engine economy torque, a second compensation demand torque is obtained according to the driver demand torque and the engine economy torque, and output torques of the rear motor and the front motor are controlled according to the second compensation demand torque and the NVH limit torque.

In some embodiments, controlling the output torques of the rear motor and the front motor according to the second compensation required torque and the NVH limiting torque includes: the second compensation required torque is larger than the second NVH limiting torque, and the rear motor is controlled to output the second NVH limiting torque; obtaining a third compensation required torque according to the second compensation required torque and the second NVH limiting torque; controlling an output torque of the front motor according to the third compensation required torque and the first NVH limiting torque.

In some embodiments, controlling the output torques of the rear motor and the front motor according to the second compensation required torque and the NVH limiting torque includes: and the second compensation required torque is smaller than the second NVH limiting torque, and the rear motor is controlled to output the second compensation required torque.

In some embodiments, controlling the output torque of the front motor based on the third compensation required torque and the first NVH comprises: the third compensation required torque is not larger than the first NVH limiting torque, and the front motor is controlled to output the third compensation required torque; or, the third compensation demand torque is larger than the first NVH limit torque, a fourth compensation demand torque is obtained according to the third compensation demand torque and the first NVH limit torque, the front motor is controlled to output the first NVH limit torque, and the engine is controlled to output the fourth compensation demand torque.

A second aspect embodiment of the present invention provides a non-transitory computer storage medium having a computer program stored thereon, wherein the computer program when executed implements the vehicle torque distribution method of the above embodiment.

An embodiment of a third aspect of the invention provides a vehicle comprising: a battery pack; the motor comprises a front motor, a rear motor and an engine; the accelerator pedal sensor is used for acquiring the opening degree of an accelerator pedal; a vehicle speed sensor for detecting a vehicle speed; the battery manager is used for acquiring the current SOC value of the battery pack; control means for executing the vehicle torque distribution method described in the above embodiment to control the output torques of the front motor, the rear motor, and the engine.

According to the vehicle provided by the embodiment of the invention, the control device executes the vehicle torque distribution method provided by the embodiment to control the output torques of the front motor, the rear motor and the engine, so that the economy and NVH performance of the whole vehicle can be improved, and the oil consumption is reduced.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a flow chart of a vehicle torque distribution method according to one embodiment of the present invention;

FIG. 2 is a flow chart of a vehicle torque distribution method according to another embodiment of the present invention;

fig. 3 is a block diagram of a vehicle according to an embodiment of the invention.

Reference numerals:

a vehicle 10;

a battery pack 1; a front motor 2; a rear motor 3; an engine 4; an accelerator pedal sensor 5; a vehicle speed sensor 6; a battery manager 7; and a control device 8.

Detailed Description

Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.

In order to solve the above problems, a vehicle torque distribution method according to an embodiment of the first aspect of the present invention is described below with reference to the drawings, which can improve the economy and NVH performance of the entire vehicle and reduce fuel consumption.

Fig. 1 is a flowchart illustrating a vehicle torque distribution method according to an embodiment of the first aspect of the present invention, and the vehicle torque distribution method according to the embodiment of the present invention illustrated in fig. 1 includes steps S1-S4.

In an embodiment, a vehicle of an embodiment of the invention includes a front motor, a rear motor, and an engine.

Step S1, an accelerator pedal opening, a vehicle speed, and a current SOC value are acquired.

In an embodiment, the method Of the embodiment Of the invention is applicable to a hybrid vehicle, wherein the accelerator pedal opening CAN be acquired in real time through an accelerator pedal sensor, the vehicle speed CAN be acquired in real time through a vehicle speed sensor, the current SOC (State Of Charge) value Of a battery pack CAN be acquired through a battery manager, and the acquired accelerator pedal opening, vehicle speed and current SOC value are sent to a control device Of the vehicle through a vehicle CAN network.

In step S2, the driver required torque is obtained from the accelerator pedal opening and the vehicle speed.

In the embodiment of the invention, the accelerator driving condition and the vehicle speed are considered, compared with the condition that the required torque is obtained only through the analysis of the opening degree of an accelerator pedal, the required torque of the driver is determined by the opening degree of the accelerator pedal and the vehicle speed, and the acceleration feeling under different vehicle speeds can be improved.

In step S3, engine start is detected.

In the embodiment, after an ECU (Electronic Control Unit) is powered on, a user CAN start the engine through a cab key start switch, the vehicle Control device CAN detect an instruction of starting the engine through a CAN bus, and the engine is detected to be started, that is, the engine is in the hybrid mode.

In step S4, the driver demand torque is distributed to the front motor, the rear motor, and the engine according to the current SOC value, the vehicle speed, the engine economy torque, and the NVH restriction torque.

In the embodiment, for the distribution of the vehicle torque, the current SOC value, the vehicle speed, the engine economic torque and the NVH limit torque are used as references to distribute the driver required torque to the front motor, the rear motor and the engine, wherein the acceleration feeling at different vehicle speeds can be improved by referring to the vehicle speed in consideration of the vehicle speed, the driving condition of the vehicle can be considered, the engine does not need to be in a driving state all the time and the fuel consumption is reduced by referring to the current SOC value, the engine can be operated in an economic torque area all the time in a proper range of the driver required torque in consideration of the engine economic torque, the economy of the whole vehicle is ensured, and the NVH performance can be improved by referring to the NVH (Noise, Vibration and Harshness, Noise, Vibration, Harshness) limit torque.

In the embodiment, when the vehicle is in the pure electric mode or the feedback working condition, the engine is not started at the moment, only the front motor and the rear motor participate, and the torque required by the driver is distributed to the front motor and the rear motor by the vehicle speed factor.

When the engine is started, the whole vehicle is in a hybrid mode, the embodiment of the invention needs to compare the relation between the current SOC value and the expected SOC value set by the vehicle, for example, when the current SOC value is larger than the expected SOC value, the SOC value of the battery pack is in a normal working range at the moment, and the requirement of vehicle driving can be met, so that the torque required by a driver can be output by the front motor and the rear motor, the engine is not in a driving state and is only in a power generation state, and the oil consumption of the engine can be reduced, or when the current SOC value is smaller than the expected SOC value, the SOC value of the battery pack cannot meet the requirement of vehicle driving at the moment, the torque required by the driver is distributed to the engine, and the engine is controlled to be in the driving state and the power generation state; the engine economic torque factor is considered, when the torque required by a driver is larger than the engine economic torque, the residual torque can be distributed to the front motor or the rear motor for output, so that the engine always runs in an economic torque area, and the economy of the whole vehicle is ensured; when the output of the front motor or the rear motor is needed, the embodiment of the invention considers the NVH requirement, can set the prior operation output of any motor, and sets a certain threshold value for the torque output of the front motor and the rear motor, when the output capacity of the operation motor exceeds the threshold value, the torque output of the motor reaches the NVH limit torque, and then the rest torque part is distributed to the output of the other motor, so that the output limit of the motor is not determined by the capacity torque of the motor any more, but determined according to the NVH test result, the NVH performance of the vehicle is improved, meanwhile, one motor in the rear motor and the front motor is set to output preferentially, and the efficiency of the whole vehicle can be improved; and when the driver demand torque is still greater than the sum of the engine economy torque and the rear motor capacity threshold and the front motor capacity threshold, outputting the remaining demand torque by the engine, the torque output of the engine being set below the external characteristic torque.

According to the vehicle torque distribution method, the driver required torque is obtained based on the opening degree of the accelerator pedal and the vehicle speed, namely the required torque is obtained by considering the opening degree of the accelerator pedal and the vehicle speed, and compared with the method that the required torque is obtained by analyzing the opening degree of the accelerator pedal, the acceleration feeling under different vehicle speeds can be improved; and when the engine is detected to be started, distributing the driver required torque to the front motor, the rear motor and the engine according to the current SOC value, the vehicle speed, the engine economic torque and the NVH limit torque, namely, distributing the required torque by referring to the current SOC value in the method of the embodiment of the invention for distributing the vehicle torque, so that the engine does not need to be in a driving state all the time, the oil consumption is reduced, distributing the required torque by referring to the engine economic torque, the engine can run in an economic torque area within a proper range of the driver required torque, the economy of the whole vehicle is ensured, and the NVH performance can be improved by referring to the NVH limit torque to distribute the required torque.

In some embodiments, the allocating the driver required torque to the front motor, the rear motor, and the engine according to the vehicle speed, the current SOC value, the engine economy torque, and the NVH restriction torque includes allocating the driver required torque to the front motor, the rear motor, and the engine when the current SOC value is greater than the desired SOC value while the SOC value of the battery pack is in the normal operating range, and the driving force of the vehicle is not required, so that the driver required torque can be output from the front motor and the rear motor, specifically, obtaining a torque allocation ratio of the front motor and the rear motor according to the vehicle speed, obtaining a first target torque of the front motor and a second target torque of the rear motor according to the torque allocation ratio and the driver required torque, and controlling the output torques of the front motor, the rear motor, and the engine according to the first target torque, the second target torque, and the NVH restriction torque, so that the engine is not required to be in the driving state, the oil consumption of the engine is reduced.

In some embodiments, for controlling the output torques of the front motor, the rear motor, and the engine according to the first target torque, the second target torque, and the NVH limit torque, the method includes controlling the front motor to output the first target torque, controlling the rear motor to output the second target torque, and controlling the engine to operate in the power generation mode when the first target torque is less than the first NVH limit torque of the corresponding front motor and the second target torque is less than the second NVH limit torque of the corresponding rear motor, indicating that the output torques of the front motor and the rear motor are within the NVH limit torque range. The torque output of the front motor and the torque output of the rear motor are determined by limiting the torque through the NVH, and the NVH performance of the whole vehicle is improved.

In some embodiments, for controlling the output torques of the front motor, the rear motor, and the engine according to the first target torque, the second target torque, and the NVH limit torque, it includes, since the torque outputs of the front motor and the rear motor are decided by the NVH limit torque in the embodiments of the present invention, when the first target torque is greater than the first NVH limit torque and/or the second target torque is greater than the second NVH limit torque, calculating a first excess torque in which the first target torque exceeds the first NVH limit torque and/or calculating a second excess torque in which the second target torque exceeds the second NVH limit torque, obtaining a first compensation demand torque according to the first excess torque and the second excess torque, controlling the front motor to output the first target torque, controlling the rear motor to output the second target torque, controlling the engine to output the first compensation demand torque, and operating the power generation mode. That is, considering the NVH factor, the embodiment of the present invention uses the first target torque and the second target torque as the output limit thresholds of the front motor and the rear motor, respectively, and when the torques of the front motor and the rear motor are greater than the NVH limit torques of the motors, it indicates that the driver required torque is still greater than the sum of the engine economic torque, the rear motor output limit threshold and the front motor output limit threshold, and then the remaining driving torque, that is, the first compensation required torque is controlled to be executed by the engine, and at this time, the engine needs to participate in driving and power generation to meet the operation requirement of the entire vehicle.

In some embodiments, for distributing the driver demand torque to the front motor, the rear motor, and the engine according to the vehicle speed, the current SOC value, the engine economy torque, and the NVH limit torque, the method includes, when the current SOC value is not greater than the desired SOC value, determining whether the driver demand torque is greater than the engine economy torque, and specifically, when it is determined that the driver demand torque is not greater than the engine economy torque, controlling the engine to output the driver demand torque; or when the driver required torque is determined to be larger than the engine economic torque, controlling the engine to output the engine economic torque, obtaining a second compensation required torque according to the driver required torque and the engine economic torque, and controlling the output torques of the rear motor and the front motor according to the second compensation required torque and the NVH limit torque. That is, when the current SOC value is smaller than the desired SOC, the main driving torque is executed by the engine, and when the driver demand torque is smaller than the engine economic torque curve, only the engine executes the driver demand torque without involvement of the front motor and the rear motor; when the driver demand torque is greater than the economy torque curve of the engine, the engine is restricted to operate at the economy torque curve, and the remaining demand torque, i.e., the second compensation demand torque, is executed by the electric machine.

Wherein the second compensation demand torque may be understood as a difference between the driver demand torque and the engine economy torque.

In some embodiments, the controlling the output torques of the rear motor and the front motor according to the second compensation demand torque and the NVH restriction torque includes, when the second compensation demand torque is greater than the second NVH restriction torque, indicating that the actual torque of the rear motor reaches the NVH restriction torque, controlling the rear motor to output the second NVH restriction torque, and obtaining a third compensation demand torque according to the second compensation demand torque and the second NVH restriction torque, and controlling the output torque of the front motor according to the third compensation demand torque and the first NVH restriction torque. That is, considering the NVH factor, when the second compensation required torque is greater than the second NVH limit torque, it is indicated that the actual torque of the rear motor reaches the NVH limit torque, the rear motor is controlled to output the first NVH limit torque, and the remaining required torque is allocated to the front motor for output, so that the output limit of the rear motor is determined by the NVH limit torque, the NVH performance of the entire vehicle is ensured, and the output efficiency of the rear motor is higher than that of the front motor, and the rear motor preferentially outputs torque, thereby ensuring the output efficiency.

Wherein the third compensation required torque may be understood as a difference between the second compensation required torque and the second NVH limiting torque.

In some embodiments, for controlling the output torques of the rear motor and the front motor in accordance with the second compensation required torque and the NVH restriction torque, further comprises controlling the rear motor to output the second compensation required torque when the second compensation required torque is less than the second NVH restriction torque. Therefore, when the second compensation required torque is smaller than the second NVH limiting torque, the torque required by the driver can be met through participation of the engine and the rear motor, and the participation of the front motor is not needed.

In some embodiments, controlling the output torque of the front motor based on the third compensation demand torque and the first NVH includes controlling the front motor to output the third compensation demand torque by the participation of the engine, the front motor, and the rear motor when the third compensation demand torque is not greater than the first NVH limit torque, when the driver demand torque is less than the sum of the engine economy torque and the rear motor output limit threshold and the front motor output limit threshold; or when the third compensation required torque is larger than the first NVH limiting torque, the fact that the driver required torque is still larger than the sum of the engine economic torque, the rear motor output limiting threshold and the front motor output limiting threshold is indicated, a fourth compensation required torque is obtained according to the third compensation required torque and the first NVH limiting torque, the front motor is controlled to output the first NVH limiting torque, and the engine is controlled to output the fourth compensation required torque.

Wherein the fourth compensation required torque may be understood as a difference between the third compensation required torque and the first NVH limiting torque.

The vehicle torque distribution method according to the embodiment of the present invention is further illustrated with reference to fig. 2, and the specific steps are as follows.

Step S5, vehicle information is obtained, and the vehicle information comprises the opening degree of an accelerator pedal, the vehicle speed and the current SOC value.

In step S6, it is determined whether the engine is started. If not, go to step S7; if so, go to step S8.

In step S7, the driver-requested torque is distributed by the front motor and the rear motor according to the vehicle speed.

In step S8, it is determined whether the current SOC value is greater than the desired SOC value. If yes, go to step S9; if not, step S13 is executed.

Step S9, the torque required by the driver is distributed by the front motor and the rear motor according to the vehicle speed, the engine drives the BSG (Belt-drive Starter Generator, an integrated machine which can start and generate power by Belt transmission) motor to generate power, namely the engine is in a power generation state.

And step S10, judging whether the front motor and the rear motor exceed the NVH limiting torque. If not, go to step S11; if yes, go to step S12.

And step 11, executing according to the torque distribution values of the front motor and the rear motor, namely controlling the front motor to output a first target torque and controlling the rear motor to output a second target torque.

In step S12, the required torque exceeding the NVH torque limit portion is executed by the engine and limited by the economic torque of the engine, i.e., the front motor is controlled to output the first target torque, the rear motor is controlled to output the second target torque, the engine is controlled to output the first compensation required torque and the power generation mode is operated.

In step S13, it is determined whether the driver required torque is greater than the engine economy torque. If not, go to step S14; if yes, go to step S15.

In step S14, the driver required torque is distributed to the engine.

In step S15, the engine is operated at the economical torque, and the surplus torque, i.e., the second compensation required torque, is output by the rear motor, and step S16 is performed.

In step S16, it is determined whether the torque of the rear motor, i.e., the second compensation required torque, exceeds the second NVH restriction torque. If not, go to step S17; if yes, go to step S18.

In step S17, the surplus required torque, i.e., the second compensation required torque, is output by the rear motor.

In step S18, the rear motor is operated at the second NVH limit torque, and the surplus request torque, i.e., the third compensation request torque, is output from the front motor, and step S19 is performed.

In step S19, it is determined whether the front motor torque, i.e., the third compensation required torque, exceeds the first NVH restriction torque. If not, go to step S20; if yes, go to step S21.

In step S20, the remaining required torque, i.e., the third compensation required torque, is output by the front motor.

And step S21, the front motor operates at the first NVH limiting torque, the residual required torque is output by the engine and limited by the external characteristic torque, namely the rear motor is controlled to output the second NVH limiting torque, the front motor outputs the first NVH limiting torque, and the engine is controlled to output the sum of the fourth compensation required torque and the economic torque.

Therefore, according to the vehicle torque distribution method of the embodiment of the invention, the current SOC value, the vehicle speed, the engine economic torque and the NVH limit torque are used as references to distribute the driver required torque to the front motor, the rear motor and the engine, wherein the expected SOC value is considered, the current SOC value is compared with the expected SOC value, when the current SOC value is higher than the expected SOC value, the engine is controlled to be in an economic power generation state, the driver required torque is borne by the front motor and the rear motor, so as to reduce the fuel consumption of the engine, or when the current SOC value is lower than the expected SOC value, the engine is controlled to be in a driving and power generation state, and in a proper required torque range, the engine can be operated in an economic torque area all the time, and the economy of the engine is ensured; and the NVH factor is considered, so that the torque output limitation of the front motor and the torque output limitation of the rear motor are not limited by capacity, but is limited by NVH torque, the NVH performance of the whole vehicle is improved, meanwhile, the rear motor can be controlled to preferentially output torque, the output efficiency of the rear motor is higher than that of the front motor, and the output efficiency of the whole vehicle is ensured.

Embodiments of a second aspect of the present invention provide a non-transitory computer storage medium having a computer program stored thereon, wherein the computer program, when executed, implements the vehicle torque distribution method provided by the above embodiments.

In a third aspect of the present invention, a vehicle 10 according to an embodiment of the present invention includes a battery pack 1, a front motor 2, a rear motor 3, an engine 4, an accelerator pedal sensor 5, a vehicle speed sensor 6, a battery manager 7, and a control device 8, as shown in fig. 3.

The accelerator pedal sensor 5 is used for acquiring the opening degree of an accelerator pedal; the vehicle speed sensor 6 is used for detecting vehicle speed; the battery manager 7 is used for acquiring the current SOC value of the battery pack 1; the control device 8 is configured to execute the vehicle torque distribution method provided in the above-described embodiment to control the output torques of the front motor 2, the rear motor 3, and the engine 4.

According to the vehicle 10 of the embodiment of the invention, the control device 8 executes the vehicle torque distribution method provided by the embodiment to control the output torques of the front motor 2, the rear motor 3 and the engine 4, so that the economy and NVH performance of the whole vehicle can be improved, and the fuel consumption can be reduced.

In the description of this specification, any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of custom logic functions or processes, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.

The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A vehicle torque distribution method, characterized in that a vehicle includes a front motor, a rear motor, and an engine, the vehicle torque distribution method comprising:

acquiring the opening degree of an accelerator pedal, the vehicle speed and the current SOC value;

obtaining the torque required by the driver according to the opening degree of the accelerator pedal and the vehicle speed;

detecting an engine start;

distributing the driver-demanded torque to the front motor, the rear motor, and the engine according to the current SOC value, the vehicle speed, an engine economy torque, and an NVH limit torque.

2. The vehicle torque distribution method according to claim 1, wherein distributing the driver required torque to the front motor, the rear motor, and the engine according to the vehicle speed, the current SOC value, an engine economy torque, and an NVH limit torque, includes:

the current SOC value is larger than an expected SOC value, and the torque distribution proportion of the front motor and the rear motor is obtained according to the vehicle speed;

obtaining a first target torque of the front motor and a second target torque of the rear motor according to the torque distribution ratio and the driver required torque;

controlling output torques of the front motor, the rear motor, and the engine according to the first target torque, the second target torque, and the NVH limiting torque.

3. The vehicle torque distribution method according to claim 2, wherein controlling the output torques of the front motor, the rear motor, and the engine according to the first target torque, the second target torque, and the NVH limiting torque includes:

and the first target torque is smaller than a first NVH (noise vibration and harshness) limit torque corresponding to the front motor, and the second target torque is smaller than a second NVH limit torque corresponding to the rear motor, so that the front motor is controlled to output the first target torque, the rear motor is controlled to output the second target torque, and the engine is controlled to operate in a power generation mode.

4. The vehicle torque distribution method according to claim 2, wherein controlling the output torques of the front motor, the rear motor, and the engine according to the first target torque, the second target torque, and the NVH limiting torque includes:

the first target torque is larger than the first NVH limiting torque and/or the second target torque is larger than the second NVH limiting torque, a first exceeding torque that the first target torque exceeds the first NVH limiting torque and/or a second exceeding torque that the second target torque exceeds the second NVH limiting torque are calculated, a first compensation required torque is obtained according to the first exceeding torque and the second exceeding torque, the front motor is controlled to output the first target torque, the rear motor is controlled to output the second target torque, the engine is controlled to output the first compensation required torque, and a power generation mode is operated.

5. The vehicle torque distribution method according to claim 1, wherein distributing the driver required torque to the front motor, the rear motor, and the engine according to the vehicle speed, the current SOC value, an engine economy torque, and an NVH limit torque, includes:

judging whether the current SOC value is not more than an expected SOC value or not, and judging whether the driver required torque is more than the engine economic torque or not;

controlling the engine to output the driver required torque, the driver required torque being not greater than the engine economic torque;

or, the driver demand torque is greater than the engine economy torque, the engine is controlled to output the engine economy torque, a second compensation demand torque is obtained according to the driver demand torque and the engine economy torque, and output torques of the rear motor and the front motor are controlled according to the second compensation demand torque and the NVH limit torque.

6. The vehicle torque distribution method according to claim 5, wherein controlling the output torques of the rear motor and the front motor in accordance with the second compensation required torque and the NVH limiting torque includes:

the second compensation required torque is larger than the second NVH limiting torque, and the rear motor is controlled to output the second NVH limiting torque;

obtaining a third compensation required torque according to the second compensation required torque and the second NVH limiting torque;

controlling an output torque of the front motor according to the third compensation required torque and the first NVH limiting torque.

7. The vehicle torque distribution method according to claim 5, wherein controlling the output torques of the rear motor and the front motor in accordance with the second compensation required torque and the NVH limiting torque includes:

and the second compensation required torque is smaller than the second NVH limiting torque, and the rear motor is controlled to output the second compensation required torque.

8. The vehicle torque distribution method according to claim 6, wherein controlling the output torque of the front motor in accordance with the third compensation required torque and the first NVH includes:

the third compensation required torque is not larger than the first NVH limiting torque, and the front motor is controlled to output the third compensation required torque;

or, the third compensation demand torque is larger than the first NVH limit torque, a fourth compensation demand torque is obtained according to the third compensation demand torque and the first NVH limit torque, the front motor is controlled to output the first NVH limit torque, and the engine is controlled to output the fourth compensation demand torque.

9. A non-transitory computer storage medium having a computer program stored thereon, wherein the computer program when executed implements the vehicle torque distribution method of any of claims 1-8.

10. A vehicle, characterized by comprising:

a battery pack;

the motor comprises a front motor, a rear motor and an engine;

the accelerator pedal sensor is used for acquiring the opening degree of an accelerator pedal;

a vehicle speed sensor for detecting a vehicle speed;

the battery manager is used for acquiring the current SOC value of the battery pack;

control means for executing the vehicle torque distribution method according to any one of claims 1 to 8 to control the output torques of the front motor, the rear motor, and the engine.