CN113859220B

CN113859220B - Vehicle torque distribution method, vehicle and storage medium

Info

Publication number: CN113859220B
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: 2023-07-14
Anticipated expiration: 2040-06-30
Also published as: CN113859220A

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 speed of a vehicle and the current SOC value; obtaining a driver demand torque according to the opening degree of an accelerator pedal and the vehicle speed; detecting 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 art, for torque distribution of a hybrid electric vehicle, some schemes adopt an optimally calculated dynamic torque distribution strategy based on torque required by a driver, and the torque is reasonably distributed to an engine and a motor; some schemes ensure that the braking deceleration is constant by ensuring that the wheel-side resistance moment of the vehicle is consistent when the braking energy recovery function exists or not under the same depth of the brake pedal. However, in the above-described scheme, the required torque for the whole 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 aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide a vehicle torque distribution method, which can improve the economy and NVH performance of the whole vehicle and reduce the fuel consumption.

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

A third object of the present invention is to provide a vehicle.

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

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

In some embodiments, distributing the driver demand torque to the front motor, the rear motor, and the engine based on the vehicle speed, the current SOC value, an engine economy torque, and an NVH limit torque includes: the current SOC value is larger than the 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 proportion and the driver demand torque; and 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 restriction torque.

In some embodiments, controlling output torques of the front motor, the rear motor, and the engine in accordance with the first target torque, the second target torque, and the NVH limit torque includes: the first target torque is smaller than the first NVH limiting torque corresponding to the front motor, the second target torque is smaller than the second NVH limiting torque corresponding to the rear motor, 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 operation power generation mode is controlled.

In some embodiments, controlling output torques of the front motor, the rear motor, and the engine in accordance with the first target torque, the second target torque, and the NVH limit 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 of the first target torque exceeding the first NVH limiting torque and/or a second exceeding torque of the second target torque exceeding the second NVH limiting torque are calculated, a first compensating 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 compensating 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 based on the vehicle speed, the current SOC value, an engine economy torque, and an NVH limit torque includes: the current SOC value is not larger than an expected SOC value, and whether the torque required by the driver is larger than the economic torque of the engine is judged; the driver demand torque is not greater than the engine economic torque, and the engine is controlled to output the driver demand torque; or, the driver demand torque is greater than the engine economic torque, the engine is controlled to output the engine economic torque, a second compensation demand torque is obtained according to the driver demand torque and the engine economic torque, and the 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 torque of the rear motor and the front motor in accordance with the second compensation demand torque and the NVH limit 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 compensating demand torque based on the second compensating demand torque and the second NVH restriction torque; and controlling the output torque of the front motor according to the third compensation required torque and the first NVH limit torque.

In some embodiments, controlling the output torque of the rear motor and the front motor in accordance with the second compensation demand torque and the NVH limit torque includes: the second compensating demand torque is less than the second NVH limit torque, and the rear motor is controlled to output the second compensating demand torque.

In some embodiments, controlling the output torque of the front electric machine in accordance with the third compensating demand 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 required torque is larger than the first NVH limiting torque, 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.

A second aspect 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 embodiments.

An embodiment of a third aspect of the present invention provides a vehicle including: a battery pack; front motor, rear motor and engine; the accelerator pedal sensor is used for collecting the opening of the accelerator pedal; a vehicle speed sensor for detecting a vehicle speed; the battery manager is used for collecting the current SOC value of the battery pack; control means for executing the vehicle torque distribution method according to 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 vehicle torque distribution method provided by the embodiment is executed by the control device so as 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 can be 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 foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in 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 present 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, by way of example with reference to the accompanying drawings.

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 accompanying drawings, where the method may improve economy and NVH performance of the whole 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 shown in fig. 1 includes steps S1 to S4.

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

Step S1, acquiring the opening degree of an accelerator pedal, the vehicle speed and the current SOC value.

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

And S2, obtaining the torque required by the driver according to the opening degree of the accelerator pedal and the vehicle speed.

In the embodiment, the driver demand torque refers to the demand torque meeting the driver's expectations, and when the motor is controlled according to the torque, the vehicle accelerates or decelerates according to the driver's demands.

Step S3, engine start is detected.

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

And S4, distributing the driver demand torque to the front motor, the rear motor and the engine according to the current SOC value, the vehicle speed, the economic torque of the engine and the NVH limit torque.

In the embodiment, for the distribution of the vehicle torque, the current SOC value, the vehicle speed, the economic torque of the engine and the NVH limiting torque are adopted as references to distribute the driver required torque to the front motor, the rear motor and the engine, wherein the acceleration feeling under different vehicle speeds can be improved by referring to the vehicle speed, the driving working condition of the vehicle is considered, the engine is not required to be always in a driving state by referring to the current SOC value, the oil consumption is reduced, the engine can be always operated in an economic torque area in a proper driver required torque range by referring to the economic torque of the engine, the economy of the whole vehicle is ensured, and the NVH performance can be improved by referring to the economic torque (noise, vibration and harshness, noise, vibration, harshness) limiting torque.

In an embodiment, when the vehicle is in a pure mode or a feedback condition, the engine is not started at this time, only the front motor and the rear motor participate, and the driver demand torque is distributed to the front motor and the rear motor by a vehicle speed factor.

When the engine is started, the whole vehicle is in a hybrid mode, and the relation between the current SOC value and the expected SOC value set by the vehicle is required to be compared, 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 and can meet the driving requirement of the vehicle, so that the driver demand torque can be output by the front motor and the rear motor, and the engine is not in a driving state and is only in a power generation state, so that 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 driving requirement of the vehicle, the driver demand torque is distributed to the engine, and the engine is controlled to be in a driving state and a power generation state; and the embodiment of the invention considers the economic torque factor of the engine, when the torque required by the driver is greater than the economic torque of the engine, the residual torque can be distributed to the front motor or the rear motor for output, so that the engine always operates in the economic torque area, and the economy of the whole vehicle is ensured; when the output capacity of the running motor exceeds the threshold value, the torque output of the motor is indicated to reach the NVH limit torque, and the rest torque is distributed to the other motor output, so that the output limit of the motor is not determined by the capacity torque of the motor any more, but is determined according to the NVH test result, the NVH performance of the vehicle is improved, and meanwhile, the priority output of one motor of the rear motor and the front motor is set in the embodiment of the invention, and the overall vehicle efficiency can be improved; and when the driver demand torque is still greater than the sum of the engine economy torque and the rear and front motor capability thresholds, then the remaining demand torque is output by the engine, the torque output of the engine being set below the external characteristic torque.

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

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 economic torque and the NVH limit torque includes, when the current SOC value is greater than the desired SOC value, the SOC value of the battery pack is in a normal operating range, which can satisfy the requirement of driving the vehicle, without the engine providing driving force, so that the driver demand torque can be output by the front motor and the rear motor, specifically, the torque distribution ratio of the front motor and the rear motor is obtained according to the vehicle speed, the first target torque of the front motor and the second target torque of the rear motor are obtained according to the torque distribution ratio and the driver demand torque, and the output torques of the front motor, the rear motor and the engine are controlled according to the first target torque, the second target torque and the NVH limit torque, so that the engine does not need to be in a driving state, and the fuel consumption of the engine is reduced.

In some embodiments, controlling the output torque of the front motor, the rear motor, and the engine based on the first target torque, the second target torque, and the NVH restriction torque 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 a generating mode when the first target torque is less than the first NVH restriction torque of the corresponding front motor and the second target torque is less than the second NVH restriction torque of the corresponding rear motor, indicating that the output torques of the front motor and the rear motor are within the NVH restriction torque range. The torque output of the front motor and the rear motor is determined by the NVH limiting torque, so that the NVH performance of the whole vehicle is improved.

In some embodiments, for controlling the output torque 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, including, since the torque output of the front motor and the rear motor is determined by the NVH limiting torque in the embodiment of the present invention, when the first target torque is greater than the first NVH limiting torque and/or the second target torque is greater than the second NVH limiting torque, calculating a first exceeding torque of the first target torque exceeding the first NVH limiting torque and/or calculating a second exceeding torque of the second target torque exceeding the second NVH limiting torque, obtaining the first compensation demand torque according to the first exceeding torque and the second exceeding 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 takes the first target torque and the second target torque as the output limiting thresholds of the front motor and the rear motor, respectively, when the torques of the front motor and the rear motor are greater than the NVH limiting torque of the motor, which indicates that the driver demand torque is still greater than the sum of the economic torque of the engine, the output limiting threshold of the rear motor and the output limiting threshold of the front motor, the remaining driving torque, that is, the first compensation demand torque, is controlled to be executed by the engine, and at this time, the engine needs to participate in driving and generating power to meet the running requirement of the whole vehicle.

In some embodiments, for distributing the driver demand torque to the front motor, the rear motor and the engine based on the vehicle speed, the current SOC value, the engine economic torque and the NVH restriction torque, including determining whether the driver demand torque is greater than the engine economic torque when the current SOC value is not greater than the desired SOC value, and in particular, controlling the engine to output the driver demand torque when the driver demand torque is determined not to be greater than the engine economic torque; or when the driver demand torque is determined to be greater than the engine economic torque, controlling the engine to output the engine economic torque, obtaining a second compensation demand torque according to the driver demand torque and the engine economic torque, and controlling the output torques of the rear motor and the front motor according to the second compensation demand torque and the NVH limit torque. That is, when the current SOC value is smaller than the desired SOC, the main driving torque is performed by the engine, and when the driver demand torque is smaller than the engine economic torque curve, only the engine performs the driver demand torque without the participation of the front motor and the rear motor; when the driver demand torque is greater than the engine's economic torque curve, then the engine is limited to operating in the economic torque curve and the remaining demand torque, the second compensating demand torque, is executed by the electric machine.

The second compensating demand torque may be understood as the difference between the driver demand torque and the engine economy torque.

In some embodiments, controlling the output torque of the rear motor and the front motor based on 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, then controlling the rear motor to output the second NVH restriction torque, and obtaining a third compensation demand torque based on the second compensation demand torque and the second NVH restriction torque, and controlling the output torque of the front motor based on the third compensation demand torque and the first NVH restriction torque. That is, considering the factor of NVH, when the second compensation demand torque is greater than the second NVH limiting torque, when the actual torque of the rear motor is described to reach the limiting torque of NVH, the rear motor is controlled to output the first NVH limiting torque, and the remaining demand torque is distributed to the front motor for output, so that the output limit of the rear motor is determined by the NVH limiting torque, the NVH performance of the whole vehicle is ensured, the output efficiency of the rear motor is higher than that of the front motor, the rear motor outputs torque preferentially, and the output efficiency is ensured.

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

In some embodiments, controlling the output torque of the rear and front motors in accordance with the second compensation demand torque and the NVH restriction torque further comprises controlling the rear motor to output the second compensation demand torque when the second compensation demand torque is less than the second NVH restriction torque. Therefore, when the second compensation demand torque is less than the second NVH limit torque, the driver demand torque can be satisfied by the engine and the rear motor without the front motor.

In some embodiments, controlling the output torque of the front electric machine based on the third compensation demand torque and the first NVH includes controlling the front electric machine to output the third compensation demand torque by engine, front electric machine, and rear electric machine engagement to meet the driver demand torque when the third compensation demand torque is not greater than the first NVH limit torque, when the driver demand torque is less than a sum of the engine economy torque and the rear electric machine output limit threshold and the front electric machine output limit threshold; or when the third compensation required torque is larger than the first NVH limiting torque, the driver required torque is still larger than the sum of the economic torque of the engine, the rear motor output limiting threshold value and the front motor output limiting threshold value, the 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.

The fourth compensation request torque may be understood as a difference between the third compensation request 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 specific steps are as follows.

And S5, acquiring vehicle information, wherein the vehicle information comprises the opening degree of an accelerator pedal, the speed of the vehicle and the current SOC value.

Step S6, judging whether the engine is started or not. If not, executing the step S7; if so, step S8 is performed.

And S7, the torque required by the driver is distributed by a front motor and a rear motor according to the vehicle speed.

And S8, judging whether the current SOC value is larger than the expected SOC value. If yes, executing step S9; if not, step S13 is performed.

And S9, the torque required by the driver is distributed by a front motor and a rear motor according to the speed of the vehicle, and the engine drives a BSG (Belt-Driven Starter Generator integrated machine) motor to generate power by utilizing Belt transmission to realize both starting and power generation, namely, the engine is in a power generation state.

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

And S11, 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 limiting 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 compensating required torque, and the power generation mode is operated.

Step S13, judging whether the driver demand torque is greater than the engine economic torque. If not, executing step S14; if yes, go to step S15.

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

Step S15, the engine is operated at the economic torque, and the remaining torque, i.e., the second compensation required torque, is outputted from 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 limit torque. If not, executing step S17; if yes, go to step S18.

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

In step S18, the rear motor is operated at the second NVH limited torque, and the remaining required torque, i.e., the third compensation required torque, is outputted from the front motor, and step S19 is performed.

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

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

In step S21, the front motor operates at the first NVH limiting torque, and the remaining required torque is output from the engine and limited by the external characteristic torque, i.e., 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 compensating 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 economic torque of the engine and the NVH limiting torque are adopted as references to distribute the driver demand torque to the front motor, the rear motor and the engine, wherein the current SOC value is considered to be 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, and the driver demand torque is borne by the front motor and the rear motor, so that the fuel consumption of the engine is reduced, 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 demand torque range, the engine can be enabled to always run in an economic torque area, and the economical efficiency of the engine is ensured; and considering the factor of NVH for the torque output restriction of preceding motor and back motor is not the ability restriction, but NVH torque restriction, thereby improves whole car NVH performance, simultaneously, can control the back motor and carry out torque output preferentially, makes the output efficiency of back motor be higher than the output efficiency of preceding motor, guarantees the output efficiency of whole car.

An embodiment of a second aspect 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 provided by the above embodiment.

The third aspect of the present invention provides a vehicle, as shown in fig. 3, the vehicle 10 of the 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.

The accelerator pedal sensor 5 is used for acquiring the opening of the accelerator pedal; the vehicle speed sensor 6 is used for detecting the vehicle speed; the battery manager 7 is used for collecting the current SOC value of the battery pack 1; the control device 8 is configured to execute the vehicle torque distribution method provided by 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 present invention, the control device 8 executes the vehicle torque distribution method provided in the above 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 description in a flowchart or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing logical functions or steps of the process, and in which the scope of the preferred embodiments of the present invention include additional implementations 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.

Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing 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). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may 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 is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.

Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.

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

The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means 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, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles 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 speed of a vehicle and the current SOC value;

obtaining a driver demand torque according to the accelerator pedal opening and the vehicle speed;

detecting engine start;

distributing the driver demand 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;

wherein 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, comprises:

the current SOC value is larger than the 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 proportion and the driver demand 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 limit torque;

wherein 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 limit torque includes:

the first target torque is smaller than the first NVH limiting torque corresponding to the front motor, the second target torque is smaller than the second NVH limiting torque corresponding to the rear motor, 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 operation power generation mode is controlled.

2. The vehicle torque distribution method according to claim 1, characterized in that controlling the output torques of the front motor, the rear motor, and the engine in accordance with 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 of the first target torque exceeding the first NVH limiting torque and/or a second exceeding torque of the second target torque exceeding the second NVH limiting torque are calculated, a first compensating 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 compensating required torque, and a power generation mode is operated.

3. The vehicle torque distribution method according to claim 1, characterized in that distributing the driver demand torque to the front motor, the rear motor, and the engine in accordance with the vehicle speed, the current SOC value, an engine economy torque, and an NVH limit torque includes:

the current SOC value is not larger than an expected SOC value, and whether the torque required by the driver is larger than the economic torque of the engine is judged;

the driver demand torque is not greater than the engine economic torque, and the engine is controlled to output the driver demand torque;

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

4. The vehicle torque distribution method according to claim 3, characterized in that controlling the output torque of the rear motor and the front motor in accordance with the second compensation required torque and the NVH limit 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 compensating demand torque based on the second compensating demand torque and the second NVH restriction torque;

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

5. The vehicle torque distribution method according to claim 3, characterized in that controlling the output torque of the rear motor and the front motor in accordance with the second compensation required torque and the NVH limit torque includes:

the second compensating demand torque is less than the second NVH limit torque, and the rear motor is controlled to output the second compensating demand torque.

6. The vehicle torque distribution method according to claim 4, characterized in that controlling the output torque of the front motor according to 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 required torque is larger than the first NVH limiting torque, 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.

7. 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 one of claims 1-6.

8. A vehicle, characterized by comprising:

a battery pack;

front motor, rear motor and engine;

the accelerator pedal sensor is used for collecting the opening of the accelerator pedal;

a vehicle speed sensor for detecting a vehicle speed;

the battery manager is used for collecting 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 6 to control the output torques of the front motor, the rear motor, and the engine.