CN108515964B

CN108515964B - Automobile torque distribution method, device and system

Info

Publication number: CN108515964B
Application number: CN201810243184.2A
Authority: CN
Inventors: 吴孝勤; 阳向兰; 吕登科
Original assignee: Zhejiang Geely Holding Group Co Ltd; Geely Automobile Research Institute Ningbo Co Ltd
Current assignee: Zhejiang Geely Holding Group Co Ltd; Geely Automobile Research Institute Ningbo Co Ltd
Priority date: 2018-03-22
Filing date: 2018-03-22
Publication date: 2020-09-08
Anticipated expiration: 2038-03-22
Also published as: CN108515964A

Abstract

The invention provides a method, a device and a system for distributing automobile torque, which relate to the technical field of automobiles, and the method comprises the following steps: when the brake energy recovery system is activated, acquiring a master cylinder pressure value, a maximum recovery torque and an initial recovery torque of a current vehicle; calculating the total wheel side torque and the braking deceleration of the current vehicle according to the master cylinder pressure value; distributing the total wheel-side torque based on the initial recovery torque, the maximum recovery torque and the braking deceleration, and outputting a target recovery torque; and sending the target recovery torque to the motor, and triggering the motor to recover the braking energy. The automobile torque distribution method, the device and the system can ensure that the wheel-side resisting torque of the automobile is consistent under the same brake pedal depth and when the brake energy recovery function is available, the brake deceleration is constant, the condition of sudden change of the vehicle deceleration is avoided, the running stability of the automobile is improved, and the driving comfort of a driver is further improved.

Description

Automobile torque distribution method, device and system

Technical Field

The invention relates to the technical field of automobiles, in particular to an automobile torque distribution method, device and system.

Background

With the increasing popularity of hybrid electric vehicles, the quantity of hybrid electric vehicles is increasing, and the energy saving and endurance problems of hybrid electric vehicles have been greatly emphasized by the automobile engineering world at home and abroad. In order to protect the environment and to make reasonable use of resources, it is necessary to reduce the resource consumption of the hybrid vehicle. Generally, energy lost when the hybrid vehicle is braked can be recovered to improve the cruising ability of the hybrid vehicle.

However, when the existing brake energy recovery system is activated, the energy recovery torque of the existing brake energy recovery system is usually kept constant, which easily causes sudden deceleration of the vehicle, causes unstable running of the vehicle, and reduces the comfort of the driver.

Disclosure of Invention

In view of the above, the present invention provides a method, an apparatus and a system for allocating vehicle torque to alleviate the technical problems that the existing braking energy recovery system is easy to cause unstable vehicle driving and reduce the comfort of the driver.

In a first aspect, an embodiment of the present invention provides a vehicle torque distribution method applied to a vehicle controller of a hybrid power system, including: when the brake energy recovery system is activated, acquiring a master cylinder pressure value, a maximum recovery torque and an initial recovery torque of a current vehicle; calculating the total wheel side torque and the braking deceleration of the current vehicle according to the master cylinder pressure value; distributing the total wheel-side torque based on the initial recovery torque, the maximum recovery torque and the braking deceleration, and outputting a target recovery torque; and sending the target recovery torque to the motor, and triggering the motor to recover the braking energy.

With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the method includes: monitoring a brake pedal opening degree signal of the vehicle when the current vehicle runs; when the opening signal of the brake pedal is monitored, the master cylinder pressure value of the current vehicle is obtained; judging whether the master cylinder pressure value is greater than a preset pressure threshold value or not; if so, the brake energy recovery system is activated.

With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where the step of obtaining the maximum recovery torque and the initial recovery torque of the current vehicle includes: acquiring the driving parameters and vehicle attribute information of the current vehicle; the driving parameters comprise the speed of the current vehicle, gear information and a brake pedal opening signal; the vehicle attribute information includes: the motor state, the battery state, the vehicle weight, the vehicle sliding resistance and the engine back-dragging resistance moment; and calculating the maximum recovery torque and the initial recovery torque according to the driving parameters and the vehicle attribute information.

With reference to the second possible implementation manner of the first aspect, the embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein the step of allocating the total wheel-side torque based on the initial recovery torque, the maximum recovery torque, and the braking deceleration and outputting the target recovery torque includes: setting the initial recovery torque to a target recovery torque when the initial recovery torque is less than the maximum recovery torque; distributing the total wheel-side torque to a target recovery torque according to a recovery torque priority principle, and distributing the part of the total wheel-side torque exceeding the target recovery torque to a mechanical friction torque; setting the maximum recovery torque to a target recovery torque when the initial recovery torque is greater than the maximum recovery torque; allocating a portion of the total wheel-side torque exceeding the maximum recovery torque to the mechanical friction torque; wherein the sum of the mechanical friction torque and the target recovery torque is the total wheel-side torque; the target recovery torque and the mechanical friction torque are output.

With reference to the third possible implementation manner of the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where the method further includes: calculating the slip rate of the current vehicle according to the driving parameters; searching a safety coefficient corresponding to the slip rate in a pre-stored safety coefficient table; multiplying the target recovery torque by the safety factor to obtain an optimized target recovery torque; and sending the optimized target recovery torque to the motor, and triggering the motor to recover energy.

With reference to the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where the sending the target recovery torque to the motor and triggering the motor to recover the braking energy includes: sending the target recovery torque to a motor for torque response so as to drive the motor to rotate and charge the battery; monitoring an energy recovery signal in real time while charging the battery, wherein the energy recovery signal at least comprises: the electric quantity of the battery, the temperature of the battery and a motor temperature signal; and when any signal in the energy recovery signals exceeds a preset signal threshold, stopping the process of recovering the brake energy.

In a second aspect, an embodiment of the present invention further provides an automotive torque distribution device, which is disposed in a vehicle controller of a hybrid power system, and includes: the first acquisition module is used for acquiring a master cylinder pressure value, a maximum recovery torque and an initial recovery torque of a current vehicle when the brake energy recovery system is activated; the calculation module is used for calculating the total wheel side torque and the braking deceleration of the current vehicle according to the master cylinder pressure value; the distribution module is used for distributing the total wheel-side torque based on the initial recovery torque, the maximum recovery torque and the braking deceleration and outputting a target recovery torque; and the recovery module is used for sending the target recovery torque to the motor and triggering the motor to recover the braking energy.

With reference to the second aspect, an embodiment of the present invention provides a first possible implementation manner of the second aspect, where the apparatus further includes: the monitoring module is used for monitoring a brake pedal opening degree signal of the vehicle when the current vehicle runs; the second acquisition module is used for acquiring the master cylinder pressure value of the current vehicle when the opening signal of the brake pedal is monitored; the judging module is used for judging whether the pressure value of the master cylinder is greater than a preset pressure threshold value or not; and the activation module is used for activating the brake energy recovery system when the judgment result of the judgment module is yes.

With reference to the second aspect, an embodiment of the present invention provides a first possible implementation manner of the second aspect, where the first obtaining module is configured to: acquiring the driving parameters and vehicle attribute information of the current vehicle; the driving parameters comprise the speed of the current vehicle, gear information and a brake pedal opening signal; the vehicle attribute information includes: the motor state, the battery state, the vehicle weight, the vehicle sliding resistance and the engine back-dragging resistance moment; and calculating the maximum recovery torque and the initial recovery torque according to the driving parameters and the vehicle attribute information.

In a third aspect, the present invention further provides an automobile torque distribution system, which includes a memory and a processor, the memory is used for storing a program for supporting the processor to execute the method of the first aspect, and the processor is configured to execute the program stored in the memory.

In a fourth aspect, an embodiment of the present invention further provides a computer storage medium for storing computer software instructions for the apparatus in the second aspect.

The embodiment of the invention has the following beneficial effects:

according to the automobile torque distribution method, the device and the system, when the brake energy recovery system is activated, the master cylinder pressure value, the maximum recovery torque and the initial recovery torque of the current automobile can be obtained; calculating the total wheel side torque and the braking deceleration of the current vehicle according to the master cylinder pressure value; distributing the total wheel-side torque based on the initial recovery torque, the maximum recovery torque and the braking deceleration, and outputting a target recovery torque; and then send the target recovery torque to the motor, trigger the motor and carry out braking energy recovery to guarantee under the same brake pedal degree of depth, when having or not brake energy recovery function, the vehicle wheel limit moment of resistance is unanimous, makes braking deceleration invariable, has avoided the condition of vehicle deceleration sudden change, increases the stability that the vehicle went, and then improves driver's driving comfort.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a flow chart of a method for allocating torque to a vehicle according to an embodiment of the present invention;

FIG. 2 is a flow chart of another method for distributing torque in a vehicle according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of wheel-side moment of resistance of a conventional braking energy recovery system at a vehicle speed as a function of brake pedal depth according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of the wheel-side moment of resistance obtained based on the vehicle torque distribution method according to the embodiment of the present invention varying with the depth of the brake pedal at a certain vehicle speed;

FIG. 5 is a schematic diagram of wheel-side moment of resistance of a conventional brake energy recovery system with constant brake pedal depth as a function of vehicle speed according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of wheel-side resisting torque obtained based on an automobile torque distribution method according to an embodiment of the invention, which varies with vehicle speed at a constant brake pedal depth;

FIG. 7 is a schematic structural diagram of a torque distribution device for a vehicle according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of another torque distribution device for a vehicle according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a torque distribution system of an automobile according to an embodiment of the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

At present, when a driver releases the accelerator to step on the brake to decelerate in the normal driving process, the traditional automobile achieves the deceleration effect through the engine rotation resistance moment and the mechanical friction resistance of a brake system, but the kinetic energy lost by the deceleration of the automobile can only be lost through the heat energy generated by the friction resistance in the deceleration process, and the resistance loss can achieve the good oil-saving effect if the kinetic energy can be recycled in a certain mode.

However, in the existing brake energy recovery function system, the maximum recovery torque of the brake energy recovery is determined only based on signals of a vehicle speed, an accelerator, a battery motor and the like, and the electronic resistance torque and the friction mechanical resistance torque which are partially recovered act on the wheel edge together to enable the vehicle to achieve the deceleration effect. Based on the above, the embodiment of the invention provides an automobile torque distribution method, device and system, which can intelligently distribute the wheel side resisting moment of a vehicle based on the magnitude of the stepping brake depth (a brake master cylinder pressure signal), and respectively distribute the wheel side resisting moment to the mechanical resisting moment and the energy recovery electronic resisting moment, so that the wheel side resisting moment of the vehicle is consistent when the brake energy recovery function is available or unavailable under the same brake pedal depth, the brake deceleration is constant, and the driving comfort of a driver is improved.

For the convenience of understanding the present embodiment, a method for distributing torque of an automobile disclosed in the present embodiment will be described in detail first.

The first embodiment is as follows:

the embodiment of the invention provides an automobile torque distribution method, which can be applied to a vehicle controller of a hybrid system, wherein the vehicle controller can be a vehicle controller based on an Electronic Stability Program (ESP) system, the ESP system can be composed of a control unit, a steering sensor (for monitoring the steering angle of a steering wheel), a wheel sensor (for monitoring the speed rotation of each wheel), a side-slip sensor (for monitoring the rotation state of a vehicle body around a vertical axis), a transverse acceleration sensor (for monitoring the centrifugal force when the automobile turns), and the like, and the vehicle driving state information transmitted from each sensor is analyzed, and then a deviation rectification command is sent out to help the vehicle to maintain dynamic balance so as to keep the optimal Stability of the vehicle under various conditions.

A flow chart of a method of distributing vehicle torque as shown in fig. 1, comprising the steps of:

step S102, when the brake energy recovery system is activated, obtaining a master cylinder pressure value, a maximum recovery torque and an initial recovery torque of the current vehicle;

step S104, calculating the total wheel side torque and the brake deceleration of the current vehicle according to the master cylinder pressure value;

step S106, distributing the total wheel side torque based on the initial recovery torque, the maximum recovery torque and the braking deceleration and outputting a target recovery torque;

and step S108, sending the target recovery torque to the motor, and triggering the motor to recover the brake energy.

In a specific implementation, the brake energy recovery system is not activated in real time, and needs to be activated when the vehicle slides, and when the vehicle controller detects that the driver steps on the brake pedal to brake, the vehicle controller determines whether to enter a brake energy recovery working condition, and further determines whether to activate a brake energy recovery function according to a master cylinder pressure value, so that the method further includes an activation process of the brake energy recovery system, specifically, as shown in a flowchart of another vehicle torque distribution method shown in fig. 2, the method includes the following steps:

step S202, monitoring a brake pedal opening signal of the vehicle when the current vehicle runs;

in general, ESP systems have various sensors to monitor the operation of each system in real time during the running of the vehicle, and the brake pedal opening signal can be obtained by a pedal sensor.

Specifically, the main signals or parameters in the embodiment of the present invention may include: the vehicle speed, the engine speed, the accelerator pedal opening signal, the brake pedal opening signal, the battery SOC (State of Charge) signal, the motor and battery predicted charging power limit value, the gear signal, the ESP sliding State signal, the wheel side torque and the like, and specific signals or parameters can be obtained through corresponding sensors according to actual conditions.

Step S204, when the opening signal of the brake pedal is monitored, the master cylinder pressure value of the current vehicle is obtained;

step S206, judging whether the master cylinder pressure value is larger than a preset pressure threshold value; if yes, go to step S208; if not, return to step S202.

Considering that the hybrid electric vehicle frequently steps on the brake pedal according to different road condition information or different driving habits of a driver during driving, the hybrid electric vehicle is not suitable for energy recovery when the brake pedal is slightly stepped on. Therefore, in order to avoid frequent starting of the brake energy recovery system, the method according to the embodiment of the invention can judge the master cylinder pressure value obtained when the brake pedal is stepped on, and only when the master cylinder pressure value is greater than the preset threshold value, the following step S208 is executed to activate the brake energy recovery system, thereby avoiding energy waste caused by frequent invalid starting.

Step S208, activating a brake energy recovery system;

step S210, acquiring a master cylinder pressure value, a maximum recovery torque and an initial recovery torque of the current vehicle;

considering that the maximum recovery torque and the initial recovery torque are different due to different attributes such as the vehicle weight and the engine of each vehicle, the maximum recovery torque and the initial recovery torque are usually calculated based on the vehicle attribute information and the current driving parameters of the vehicle, and the specific calculation steps may include: (1) acquiring the driving parameters and vehicle attribute information of the current vehicle; the driving parameters comprise the speed of the current vehicle, gear information and a brake pedal opening signal; the vehicle attribute information includes: the motor state, the battery state, the vehicle weight, the vehicle sliding resistance and the engine back-dragging resistance moment; (2) and calculating the maximum recovery torque and the initial recovery torque according to the driving parameters and the vehicle attribute information.

In general, the maximum recovery torque, which is a limit value of the electric recovery torque in the braking energy recovery system, may be calculated based on the motor and battery capabilities, such as the motor status and the battery status.

Specifically, simulation calculation can be performed according to vehicle attribute information and driving parameters, a vehicle computer simulation model can be established through a modeling method based on MATLAB/Simulink in the simulation calculation process, energy management strategy design is performed according to the simulation model, and then the maximum recovery torque and the allowable recovery torque are obtained based on the vehicle attribute information and the driving parameters of the current vehicle. Furthermore, the simulation model can be used for quantitatively analyzing the energy consumption of the whole vehicle, establishing an energy consumption model for designing an energy management strategy, quickly verifying the energy management strategy, reducing unnecessary sample vehicle manufacturing and real vehicle tests, shortening the development period and reducing the development cost. The specific modeling method of simulation calculation and the establishment method of the simulation model can be realized by referring to related data in the prior art, which is not limited in the embodiment of the invention.

Step S212, calculating the total wheel side torque and the brake deceleration of the current vehicle according to the master cylinder pressure value;

specifically, the calculation process may be obtained by an experimental calibration method, and in a specific implementation, a calibration table of a master cylinder pressure value and a total wheel-side torque and a brake deceleration may be stored in the vehicle controller in advance, when the master cylinder pressure value is obtained, the corresponding total wheel-side torque and brake deceleration may be searched in the calibration table according to the master cylinder pressure value, and further, the total wheel-side torque may be distributed based on the initial recovery torque, the maximum recovery torque, and the brake deceleration, where the distribution process is as shown in step S214 to step S220.

The sequence of the calculation process in step S210 and step S212 may be calculated according to actual situations, and is not limited to the sequence described in the embodiment of the present invention.

Step S214, when the initial recovery torque is smaller than the maximum recovery torque, setting the initial recovery torque as a target recovery torque;

step S216, when the initial recovery torque is larger than the maximum recovery torque, setting the maximum recovery torque as a target recovery torque;

step S218, distributing the total wheel-side torque to a target recovery torque according to a recovery torque priority principle, and distributing the part of the total wheel-side torque exceeding the target recovery torque to a mechanical friction torque;

specifically, the total wheel-side torque required currently can be calculated based on the master cylinder pressure value, and then the total wheel-side torque is distributed based on the maximum recovery torque; the target recovery torque is an electronic recovery torque provided by the motor.

In the embodiment of the invention, the total wheel-side torque is distributed according to a recovery torque priority principle, the electronic recovery torque (target recovery torque) is distributed preferentially, and the part with insufficient electronic recovery torque is distributed to the mechanical friction torque, wherein the sum of the mechanical friction torque and the target recovery torque is the total wheel-side torque, namely the sum of the mechanical friction torque and the target recovery torque is kept constant in the distribution process.

Step S220, outputting a target recovery torque and a mechanical friction torque;

the target recovery torque is a torque for recovering brake energy, and the mechanical friction torque is a torque for decelerating by friction resistance.

And step S222, sending the target recovery torque to the motor, and triggering the motor to recover the brake energy.

Specifically, the implementation process of the foregoing step S222 includes: sending the target recovery torque to a motor for torque response so as to drive the motor to rotate and charge the battery;

in consideration of the safety of the battery, the method further includes:

monitoring an energy recovery signal in real time, wherein the energy recovery signal at least comprises: the electric quantity of the battery, the temperature of the battery and a motor temperature signal; and when any signal in the energy recovery signals exceeds a preset signal threshold, stopping the process of recovering the brake energy.

Further, considering that the vehicle may be partially slipped due to soft and damp ground or due to heavy load during driving, the method further includes: (1) calculating the slip rate of the current vehicle according to the driving parameters; (2) searching a safety coefficient corresponding to the slip rate in a pre-stored safety coefficient table; (3) multiplying the target recovery torque by the safety factor to obtain an optimized target recovery torque; (4) and sending the optimized target recovery torque to the motor, and triggering the motor to recover energy.

Specifically, assuming a linear velocity of a wheel grounding point with respect to the ground is Va and an axial velocity of the wheel is Vx, the slip ratio is (Va/Vx) × 100%. In a specific implementation, the slip ratio may be set according to vehicle attribute information and a current road condition, so that the calculation process of the slip ratio may be implemented by referring to related materials in the prior art, which is specifically based on an actual situation, and the embodiment of the present invention is not limited thereto.

In order to facilitate understanding of the automobile torque distribution method provided by the embodiment of the invention, fig. 3 and 4 respectively show schematic diagrams of a conventional braking energy recovery system in the prior art and a wheel side resistance torque obtained based on the automobile torque distribution method provided by the embodiment of the invention, which varies with the depth of a brake pedal at a certain vehicle speed.

As can be seen from fig. 3, the braking mechanical resistance (mechanical friction torque) of the conventional braking energy recovery system is in a direct proportion to the depth of the brake pedal, and the electronic wheel side resistance is kept constant based on the target recovery torque calculated by the braking energy recovery system and is basically independent of the depth of the brake pedal, so that the total wheel side resistance torque is not in a direct proportion to the depth of the brake pedal, and therefore, the braking deceleration of the vehicle is suddenly changed, which results in unstable vehicle running; in fig. 4, after the wheel-side total torque is intelligently distributed based on the automobile torque distribution method provided by the embodiment of the invention, the wheel-side total torque and the depth of the brake pedal are in a direct proportion relationship, so that the braking deceleration of the automobile is continuously and continuously not suddenly changed, the running stability of the automobile is improved, and the comfort level of a driver is further improved.

Further, fig. 5 and fig. 6 respectively show the influence of different vehicle speed changes on the wheel-side resisting torque under the same brake pedal depth obtained by the conventional brake energy recovery system and the vehicle torque distribution method provided by the embodiment of the invention in the prior art.

As can be seen from comparison between fig. 5 and fig. 6, under the condition that the depth of the brake pedal is constant, the wheel-side mechanical resistance (mechanical friction torque) and the electronic resistance (target recovery torque) of the conventional brake energy recovery system start to increase along with the decrease of the vehicle speed (the recovery torque increases along with the decrease of the engine rotation speed when the power of the motor is recovered and the like), and when the vehicle speed is less than a certain threshold value, the brake energy recovery system exits, the wheel-side resistance is significantly reduced, the deceleration of the vehicle has obvious sudden change, and the drivability is poor; after the torque distribution is carried out by the automobile torque distribution method provided by the embodiment of the invention, the sum of the wheel-side mechanical resistance (mechanical friction torque) and the electronic resistance (target recovery torque) is basically kept unchanged under each vehicle speed condition under the condition that the brake pedal is constant, so that the constant deceleration feeling is ensured.

According to the automobile torque distribution method provided by the embodiment of the invention, when the brake energy recovery system is activated, the master cylinder pressure value, the maximum recovery torque and the initial recovery torque of the current automobile can be obtained; calculating the total wheel side torque and the braking deceleration of the current vehicle according to the master cylinder pressure value; distributing the total wheel-side torque based on the initial recovery torque, the maximum recovery torque and the braking deceleration, and outputting a target recovery torque; and then send the target recovery torque to the motor, trigger the motor and carry out braking energy recovery to guarantee under the same brake pedal degree of depth, when having or not brake energy recovery function, the vehicle wheel limit moment of resistance is unanimous, makes braking deceleration invariable, has avoided the condition of vehicle deceleration sudden change, increases the stability that the vehicle went, and then improves driver's driving comfort.

Example two:

on the basis of the above embodiment, the embodiment of the present invention further provides an automobile torque distribution device, which is disposed at a vehicle controller of a hybrid system, as shown in fig. 7, and the device includes:

the first obtaining module 70 is configured to obtain a master cylinder pressure value, a maximum recovery torque and an initial recovery torque of a current vehicle when the brake energy recovery system is activated;

a calculation module 72, configured to calculate a total wheel-side torque and a braking deceleration of the current vehicle according to the master cylinder pressure value;

a distribution module 74 configured to distribute the total wheel-side torque based on the initial recovery torque, the maximum recovery torque, and the braking deceleration, and output a target recovery torque;

and the recovery module 76 is used for sending the target recovery torque to the motor and triggering the motor to recover the brake energy.

Further, as shown in fig. 8, another structure diagram of the torque distribution device for the vehicle, in addition to the structure shown in fig. 7, the device further includes:

a monitoring module 78, configured to monitor a brake pedal opening degree signal of the vehicle when the current vehicle is running;

the second obtaining module 80 is configured to obtain a master cylinder pressure value of the current vehicle when the brake pedal opening degree signal is monitored;

a judging module 82, configured to judge whether the master cylinder pressure value is greater than a preset pressure threshold;

and an activation module 84, configured to activate the brake energy recovery system when the determination result of the determination module is yes.

Further, the first obtaining module 70 is configured to: acquiring the driving parameters and vehicle attribute information of the current vehicle; the driving parameters comprise the speed, gear information and a brake pedal opening degree signal of the current vehicle; the vehicle attribute information includes: the motor state, the battery state, the vehicle weight, the vehicle sliding resistance and the engine back-dragging resistance moment; calculating the maximum recovery torque and the initial recovery torque according to the driving parameters and the vehicle attribute information.

The automobile torque distribution device provided by the embodiment of the invention has the same technical characteristics as the automobile torque distribution method provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.

Embodiments of the present invention also provide a vehicle torque distribution system, which includes a memory for storing a program that supports a processor to execute the method of one of the above embodiments, and a processor configured to execute the program stored in the memory.

Further, an embodiment of the present invention further provides a computer storage medium, which is used for storing computer software instructions for the intelligent generator control device.

Fig. 9 shows a schematic structural diagram of a torque distribution system of an automobile, comprising: the system comprises a processor 900, a memory 901, a bus 902 and a communication interface 903, wherein the processor 900, the communication interface 903 and the memory 901 are connected through the bus 902; the processor 900 is adapted to execute executable modules, such as computer programs, stored in the memory 901.

The Memory 901 may include a high-speed Random Access Memory (RAM) and may further include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The communication connection between the network element of the system and at least one other network element is realized through at least one communication interface 903 (which may be wired or wireless), and the internet, a wide area network, a local network, a metropolitan area network, and the like can be used.

Bus 902 CAN be a CAN bus, ISA bus, PCI bus, EISA bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one double-headed arrow is shown in FIG. 9, but this does not indicate only one bus or one type of bus.

The memory 901 is used for storing a program, and the processor 900 executes the program after receiving an execution instruction, and the method executed by the vehicle torque distribution apparatus disclosed in any embodiment of the invention may be applied to the processor 900, or implemented by the processor 900.

The processor 900 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 900. The Processor 900 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 901, and the processor 900 reads the information in the memory 901, and completes the steps of the above method in combination with the hardware thereof.

The computer program product of the method, the apparatus, and the system for allocating vehicle torque provided by the embodiments of the present invention includes a computer readable storage medium storing program codes, where instructions included in the program codes may be used to execute the method described in the foregoing method embodiments, and specific implementation may refer to the method embodiments, and will not be described herein again.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that the following embodiments are merely illustrative of the present invention, and not restrictive, and the scope of the present invention is not limited thereto: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for torque distribution in a vehicle, the method being applied to a vehicle controller of a hybrid powertrain system, the method comprising:

when the brake energy recovery system is activated, acquiring a master cylinder pressure value, a maximum recovery torque and an initial recovery torque of a current vehicle;

calculating the total wheel side torque and the braking deceleration of the current vehicle according to the master cylinder pressure value;

distributing the total wheel-side torque based on the initial recovery torque, the maximum recovery torque and the braking deceleration, and outputting a target recovery torque;

sending the target recovery torque to a motor, and triggering the motor to recover brake energy;

wherein the distributing the total wheel-side torque based on the initial recovery torque, the maximum recovery torque, and the braking deceleration, and the outputting a target recovery torque includes:

setting the initial recovery torque to a target recovery torque when the initial recovery torque is less than the maximum recovery torque;

setting the maximum recovery torque to a target recovery torque when the initial recovery torque is greater than the maximum recovery torque;

distributing the total wheel-side torque to the target recovery torque according to a recovery torque priority principle, and distributing the part of the total wheel-side torque exceeding the target recovery torque to mechanical friction torque;

wherein the sum of the mechanical friction torque and the target recovery torque is the total wheel-side torque;

outputting the target recovery torque and the mechanical friction torque;

wherein, in the total wheel-side torque distribution process, the sum of the mechanical friction torque and the target recovery torque is kept constant, so that the braking deceleration is kept constant.

2. The method according to claim 1, characterized in that it comprises:

monitoring a brake pedal opening degree signal of the vehicle when the current vehicle is running;

when the opening signal of the brake pedal is monitored, the master cylinder pressure value of the current vehicle is obtained;

judging whether the master cylinder pressure value is larger than a preset pressure threshold value or not;

if so, the brake energy recovery system is activated.

3. The method of claim 2, wherein the step of obtaining the maximum recovery torque and the initial recovery torque of the current vehicle comprises:

acquiring the driving parameters and vehicle attribute information of the current vehicle;

the driving parameters comprise the speed of the current vehicle, gear information and the opening degree signal of the brake pedal; the vehicle attribute information includes: the motor state, the battery state, the vehicle weight, the vehicle sliding resistance and the engine back-dragging resistance moment;

calculating the maximum recovery torque and the initial recovery torque according to the driving parameters and the vehicle attribute information.

4. The method of claim 3, further comprising:

calculating the slip rate of the current vehicle according to the running parameters;

searching a safety coefficient corresponding to the slip rate in a pre-stored safety coefficient table;

multiplying the target recovery torque by the safety factor to obtain an optimized target recovery torque;

and sending the optimized target recovery torque to a motor, and triggering the motor to recover energy.

5. The method of claim 1, wherein the step of sending the target recovery torque to an electric machine that is triggered for brake energy recovery comprises:

sending the target recovery torque to the motor for torque response so as to drive the motor to rotate and charge a battery;

monitoring an energy recovery signal in real time while the battery is charging, wherein the energy recovery signal comprises at least: the electric quantity of the battery, the battery temperature and the motor temperature signal;

and when any signal in the energy recovery signals exceeds a preset signal threshold, stopping the process of recovering the brake energy.

6. An automotive torque distribution device provided to a vehicle controller of a hybrid system, the device comprising:

the first acquisition module is used for acquiring a master cylinder pressure value, a maximum recovery torque and an initial recovery torque of a current vehicle when the brake energy recovery system is activated;

the calculation module is used for calculating the total wheel side torque and the braking deceleration of the current vehicle according to the master cylinder pressure value;

the distribution module is used for distributing the total wheel-side torque based on the initial recovery torque, the maximum recovery torque and the braking deceleration and outputting a target recovery torque;

the recovery module is used for sending the target recovery torque to a motor and triggering the motor to recover brake energy;

the allocation module is further configured to:

outputting the target recovery torque and the mechanical friction torque;

7. The apparatus of claim 6, further comprising:

the monitoring module is used for monitoring a brake pedal opening degree signal of the vehicle when the current vehicle runs;

the second acquisition module is used for acquiring a master cylinder pressure value of the current vehicle when the opening degree signal of the brake pedal is monitored;

the judging module is used for judging whether the master cylinder pressure value is larger than a preset pressure threshold value or not;

and the activation module is used for activating the brake energy recovery system when the judgment result of the judgment module is yes.

8. The apparatus of claim 7, wherein the first obtaining module is configured to:

9. An automotive torque distribution system, characterized in that the system comprises a memory for storing a program supporting a processor to execute the method of any one of claims 1 to 5, and a processor configured for executing the program stored in the memory.