CN116985779A

CN116985779A - Vehicle torque reduction control method, device, equipment and storage medium

Info

Publication number: CN116985779A
Application number: CN202310943196.7A
Authority: CN
Inventors: 梁崇宁; 洪小科; 潘文军; 黄真; 吴颂; 周晓刚; 李通; 刘永刚
Original assignee: Dongfeng Liuzhou Motor Co Ltd
Current assignee: Dongfeng Liuzhou Motor Co Ltd
Priority date: 2023-07-28
Filing date: 2023-07-28
Publication date: 2023-11-03

Abstract

The invention discloses a vehicle torque reduction control method, device and equipment and a storage medium, and belongs to the technical field of vehicle control. When the vehicle is in a parallel mode and a deceleration instruction is received, a vehicle signal and the current speed are obtained; determining a torque down slope parameter according to the vehicle signal and the current vehicle speed; and controlling the vehicle to decelerate according to the torque reduction slope parameter. By the method, when the vehicle runs and is in a parallel state, the torque reduction slope parameter can be determined according to the vehicle signal during deceleration, so that the torque reduction slope parameter for deceleration of the vehicle can be accurately determined according to the current vehicle speed and the vehicle signal, the vehicle is further controlled to decelerate, the problem of smoothness of the throttle in different vehicle speed sections is solved, and the running smoothness of the vehicle after the accelerator pedal is released is improved.

Description

Vehicle torque reduction control method, device, equipment and storage medium

Technical Field

The present invention relates to the field of vehicle control technologies, and in particular, to a vehicle torque reduction control method, device, equipment, and storage medium.

Background

In the existing non-plug-in hybrid electric vehicle, the wheel edge torque in the parallel stage is from the sum of the torque of an engine output shaft and the torque of a driving motor output shaft, the engine torque command and the driving motor torque command are both from a whole vehicle controller, the throttle is released after the parallel stage is accelerated, the wheel edge torque can be reduced to 0, the corresponding wheel edge torque can be reduced to 0 from a positive value and then reduced to the sliding dragging force of the driving motor, the corresponding torque falling slope can be used for controlling in the process of the torque command falling, and the torque falling slope is set based on the current actual torque value, namely, different slopes are corresponding to different torque segments, or a fixed torque falling slope is used.

Because the engine torque response is slow, driving motor response is fast, when the parallel speed is higher, in order to make the drag force appear fast behind the loose throttle, the engine torque reducing instruction is fast, driving motor torque reducing instruction is fast, can obtain better torque reducing effect, however under the condition that the same set of parameter is used when the speed is lower, no matter use fixed decline slope or based on the setting of current actual torque value, the phenomenon that the moment of torsion drops too fast and brings the impact can all appear.

The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.

Disclosure of Invention

The invention mainly aims to provide a vehicle torque reduction control method, device, equipment and storage medium, and aims to solve the technical problem that the prior art cannot balance the smoothness of a throttle in different speed sections.

In order to achieve the above object, the present invention provides a vehicle torque reduction control method, which includes the following steps:

when the vehicle is in a parallel mode and a deceleration instruction is received, acquiring a vehicle signal and the current vehicle speed;

determining a torque down slope parameter according to the vehicle signal and the current vehicle speed;

and controlling the vehicle to decelerate according to the torque reduction slope parameter.

Optionally, the determining a torque down slope parameter according to the vehicle signal and the current vehicle speed includes:

determining the current torque of an engine and the current torque of a driving motor according to the vehicle signals;

and determining a torque reduction slope parameter according to the current vehicle speed, the current torque of the engine and the current torque of the driving motor.

Optionally, the determining the current torque of the engine and the current torque of the driving motor according to the vehicle signal includes:

determining an engine torque signal and a drive motor torque signal from the vehicle signal;

determining the current torque of the engine according to the engine torque signal;

and determining the current torque of the driving motor according to the driving motor torque signal.

Optionally, the determining a torque down slope parameter according to the current vehicle speed, the current engine torque and the current driving motor torque includes:

determining an engine torque slope according to the current torque of the engine and the current vehicle speed;

determining a torque slope of the driving motor according to the current torque of the driving motor and the current vehicle speed;

and determining a torque down slope parameter according to the engine torque slope and the driving motor torque slope.

Optionally, the determining an engine torque slope according to the current engine torque and the current vehicle speed includes:

and inquiring an engine slope comparison table according to the current vehicle speed and the current torque of the engine to obtain an engine torque slope.

Optionally, the determining a driving motor torque slope according to the driving motor current torque and the current vehicle speed includes:

and inquiring a driving motor slope comparison table according to the current vehicle speed and the current torque of the driving motor to obtain the torque slope of the driving motor.

Optionally, when the vehicle is in the parallel mode and a deceleration instruction is received, acquiring a vehicle signal and a current vehicle speed includes:

when the vehicle runs in the parallel mode, judging that a deceleration instruction is received when the opening degree of an accelerator pedal is detected to be reduced, and sending a signal acquisition instruction to a whole vehicle bus;

and determining a vehicle signal and the current vehicle speed according to the feedback information of the whole vehicle bus.

In addition, in order to achieve the above object, the present invention also provides a vehicle torque reduction control device, including:

the signal acquisition module is used for acquiring a vehicle signal and the current vehicle speed when the vehicle is in a parallel mode and a deceleration instruction is received;

the parameter calculation module is used for determining a torque reduction slope parameter according to the vehicle signal and the current vehicle speed;

and the vehicle control module is used for controlling the vehicle to decelerate according to the torque reduction slope parameter.

In addition, in order to achieve the above object, the present invention also proposes a vehicle torque reduction control apparatus including: the vehicle torque reduction control system comprises a memory, a processor and a vehicle torque reduction control program stored on the memory and running on the processor, wherein the vehicle torque reduction control program is configured to realize the vehicle torque reduction control method.

In addition, in order to achieve the above object, the present invention also proposes a storage medium having stored thereon a vehicle torque reduction control program which, when executed by a processor, implements the vehicle torque reduction control method as described above.

When the vehicle is in a parallel mode and a deceleration instruction is received, a vehicle signal and the current speed are acquired; determining a torque down slope parameter according to the vehicle signal and the current vehicle speed; and controlling the vehicle to decelerate according to the torque reduction slope parameter. By the method, when the vehicle runs and is in a parallel state, the torque reduction slope parameter can be determined according to the vehicle signal during deceleration, so that the torque reduction slope parameter for deceleration of the vehicle can be accurately determined according to the current vehicle speed and the vehicle signal, the vehicle is further controlled to decelerate, the problem of smoothness of the throttle in different vehicle speed sections is solved, and the running smoothness of the vehicle after the accelerator pedal is released is improved.

Drawings

FIG. 1 is a schematic diagram of a vehicle torque reduction control device in a hardware operating environment according to an embodiment of the present invention;

FIG. 2 is a flowchart of a vehicle torque reduction control method according to a first embodiment of the present invention;

FIG. 3 is a flowchart of a second embodiment of a vehicle torque reduction control method according to the present invention;

FIG. 4 is a flowchart of a complete implementation of the vehicle torque reduction control method of the present invention;

fig. 5 is a block diagram showing a first embodiment of the vehicle torque reduction control device according to the present invention.

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle torque reduction control device in a hardware operating environment according to an embodiment of the present invention.

As shown in fig. 1, the vehicle torque reduction control apparatus may include: a processor 1001, such as a central processing unit (Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, a memory 1005. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display, an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a Wireless interface (e.g., a Wireless-Fidelity (Wi-Fi) interface). The Memory 1005 may be a high-speed random access Memory (Random Access Memory, RAM) Memory or a stable nonvolatile Memory (NVM), such as a disk Memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.

It will be appreciated by those skilled in the art that the configuration shown in fig. 1 does not constitute a limitation of the vehicle torque reduction control apparatus, and may include more or fewer components than shown, or certain components may be combined, or a different arrangement of components.

As shown in fig. 1, an operating system, a network communication module, a user interface module, and a vehicle torque reduction control program may be included in the memory 1005 as one type of storage medium.

In the vehicle torque reduction control apparatus shown in fig. 1, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the vehicle torque reduction control device of the present invention may be provided in the vehicle torque reduction control device, where the vehicle torque reduction control device invokes a vehicle torque reduction control program stored in the memory 1005 through the processor 1001, and executes the vehicle torque reduction control method provided by the embodiment of the present invention.

The embodiment of the invention provides a vehicle torque reduction control method, and referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the vehicle torque reduction control method.

In this embodiment, the vehicle torque reduction control method includes the following steps:

step S10: and when the vehicle is in the parallel mode and a deceleration instruction is received, acquiring a vehicle signal and the current vehicle speed.

In this embodiment, the execution body of the embodiment may be the vehicle torque reduction control device, where the vehicle torque reduction control device has functions of data processing, data communication, program running, and the like, and the vehicle torque reduction control device may be a vehicle-mounted computer or a vehicle controller. Of course, other devices with similar functions may be used, and the implementation conditions are not limited thereto. For convenience of explanation, the present embodiment will be described taking a vehicle torque reduction control apparatus as an example.

It should be noted that, in the existing non-plug-in hybrid electric vehicle, the wheel edge torque in the parallel stage comes from the sum of the torque of the output shaft of the engine and the torque of the output shaft of the driving motor, the engine torque command and the driving motor torque command come from the whole vehicle controller, the throttle is released after the acceleration in the parallel stage, the wheel edge torque can be reduced to 0, the corresponding wheel edge torque can be reduced to 0 from a positive value and then reduced to the sliding drag force of the driving motor, the corresponding torque reduction slope can be used for controlling in the process of reducing the torque command, and the torque reduction slope is set based on the current actual torque value, namely, the corresponding different slopes in different torque segments, or the fixed torque reduction slope is used in the current means. The control technology has the defects that the torque response of the engine is slow, the response of the driving motor is fast, when the parallel speed is high, in order to enable the dragging force to occur quickly after the throttle is loosened, the torque reducing instruction of the engine is fast, the torque reducing instruction of the driving motor is fast, a good torque reducing effect can be obtained, however, under the condition that the same set of parameters is used when the speed is low, no matter the fixed falling slope is used or the current actual torque value is used, the phenomenon of impact caused by too fast torque reduction can occur, and therefore the control technology cannot balance the problem of smoothness of the throttle at different speed sections. By adopting the scheme of the embodiment, the better throttle loosening and torque reducing smoothness in the whole parallel vehicle speed section can be obtained, and the basic principle is as follows: 1. torque reduction of the driving motor is controlled by using a torque reduction slope based on the current actual torque and the vehicle speed; 2. the torque reduction slope control of the engine is used based on the current actual torque; in the parallel throttle release stage, the whole vehicle controller searches a corresponding torque drop slope control table according to an actual torque signal value of the engine, an actual torque signal value of the driving motor and a vehicle speed signal value received by the CAN network to obtain a corresponding value for subsequent torque control.

It should be understood that, first, it is confirmed that the vehicle is in a parallel mode, specifically, the parallel mode is that the vehicle uses the engine and the driving motor to provide power and torque simultaneously during running.

In a specific implementation, the vehicle signals include signals of the operating states of the engine and the drive motor, respectively.

Further, in order to accurately determine the vehicle state and acquire the vehicle signal and the current vehicle speed, step S10 includes: when the vehicle runs in the parallel mode, judging that a deceleration instruction is received when the opening degree of an accelerator pedal is detected to be reduced, and sending a signal acquisition instruction to a whole vehicle bus; and determining a vehicle signal and the current vehicle speed according to the feedback information of the whole vehicle bus.

The method includes the steps that firstly, a movement mode of a vehicle is determined, when the vehicle runs in a parallel mode, state monitoring is conducted on an accelerator pedal of the vehicle, when the opening degree of the accelerator pedal is monitored to be reduced, a deceleration instruction is judged to be received, namely, when the opening degree of the accelerator pedal is reduced, the deceleration instruction is considered to be received, and at the moment, a signal acquisition instruction is sent to a whole vehicle bus.

It should be appreciated that the signal acquisition command may be any form of vehicle control command, and the present embodiment is not limited in this regard.

In specific implementation, after the deceleration instruction is determined to be received, a signal acquisition instruction is sent to a whole vehicle bus, namely a CAN network, and then a vehicle signal and a current vehicle speed in the vehicle are determined according to the fed-back information.

By the method, conditions for performing torque reduction and speed reduction control are accurately judged, and signals of all parts of the vehicle are collected.

Step S20: and determining a torque down slope parameter according to the vehicle signal and the current vehicle speed.

After determining the vehicle signal, determining the current torques of the engine and the driving motor according to the vehicle signal, and calculating the torque reduction slope parameter of the vehicle by combining the current vehicle speed.

Step S30: and controlling the vehicle to decelerate according to the torque reduction slope parameter.

It should be understood that after the torque down slope parameter is determined, the engine and the driving motor are controlled according to the engine torque slope and the driving motor torque slope respectively controlled in the torque down slope parameter, so that smooth deceleration of the vehicle is controlled, and the phenomenon of impact caused by too fast torque down is reduced.

In the embodiment, when the vehicle is in the parallel mode and a deceleration instruction is received, a vehicle signal and the current vehicle speed are acquired; determining a torque down slope parameter according to the vehicle signal and the current vehicle speed; and controlling the vehicle to decelerate according to the torque reduction slope parameter. By the method, when the vehicle runs and is in a parallel state, the torque reduction slope parameter can be determined according to the vehicle signal during deceleration, so that the torque reduction slope parameter for deceleration of the vehicle can be accurately determined according to the current vehicle speed and the vehicle signal, the vehicle is further controlled to decelerate, the problem of smoothness of the throttle in different vehicle speed sections is solved, and the running smoothness of the vehicle after the accelerator pedal is released is improved.

Referring to fig. 3, fig. 3 is a flowchart of a second embodiment of a vehicle torque reduction control method according to the present invention.

Based on the above first embodiment, the vehicle torque reduction control method of the present embodiment includes, in the step S20:

step S201: and determining the current torque of the engine and the current torque of the driving motor according to the vehicle signals.

The current torque of the engine and the current torque of the driving motor are respectively determined by signal information and data in vehicle signals.

Further, in order to accurately extract information and data according to the vehicle signal, step S201 includes: determining an engine torque signal and a drive motor torque signal from the vehicle signal; determining the current torque of the engine according to the engine torque signal; and determining the current torque of the driving motor according to the driving motor torque signal.

It should be appreciated that all vehicle signals are first extracted and separated to obtain an engine torque signal and a drive motor torque signal.

In a specific implementation, after determining the engine torque signal, determining the torque of the engine at the current moment according to the engine torque signal, determining the driving motor torque signal, and determining the torque of the driving motor at the current moment according to the data in the driving motor torque signal.

By the method, the torque of the driving motor and the torque of the engine at the current moment are accurately collected.

Step S202: and determining a torque reduction slope parameter according to the current vehicle speed, the current torque of the engine and the current torque of the driving motor.

The torque down slope parameter calculated according to the current vehicle speed, the current torque of the engine and the current torque of the driving motor comprises an engine torque slope and a driving motor torque slope.

Further, in order to determine the torque down slope parameter, step S202 includes: determining an engine torque slope according to the current torque of the engine and the current vehicle speed; determining a torque slope of the driving motor according to the current torque of the driving motor and the current vehicle speed; and determining a torque down slope parameter according to the engine torque slope and the driving motor torque slope.

It should be appreciated that the engine torque ramp rate is determined based on the current engine torque combined with the current annual vehicle speed, and then the current drive motor torque is combined with the current vehicle speed to obtain the engine torque ramp rate and the drive motor torque ramp rate.

In this way, calculation and control of torque based on the current vehicle speed is achieved.

Further, in order to determine an engine torque slope, the step of determining an engine torque slope according to the current engine torque and the current vehicle speed includes: and inquiring an engine slope comparison table according to the current vehicle speed and the current torque of the engine to obtain an engine torque slope.

In a specific implementation, the whole vehicle controller controls the driving motor to reduce torque, and uses the torque reduction slope control based on the current actual torque and the vehicle speed, and the slope comparison table can be one of the following forms:

the engine slope map may be a map that incorporates the current vehicle speed.

The vehicle controller controls the engine to reduce torque, uses the torque reduction slope control based on the current actual torque, and the slope control table can be in one form as follows:

and the whole vehicle controller acquires the slope control value according to the table and then carries out the next calculation.

In this way, control and determination of the torque slope of the engine is achieved.

Further, in order to determine a driving motor torque slope of the driving motor, the step of determining the driving motor torque slope according to the current torque of the driving motor and the current vehicle speed includes: and inquiring a driving motor slope comparison table according to the current vehicle speed and the current torque of the driving motor to obtain the torque slope of the driving motor.

Note that, with reference to the engine gradient map described above, the driving motor torque gradient map is the same pattern, but the current torque of the driving motor and the different torque gradients corresponding to the different current vehicle speeds may be any values, which is not limited in this embodiment.

It should be understood that fig. 4 shows a complete implementation flow of the scheme of the present embodiment.

In this way, an accurate determination of the most appropriate slope for torque reduction of the drive motor at the current vehicle speed is achieved.

The present embodiment determines the current torque of the engine and the current torque of the driving motor according to the vehicle signal; and determining a torque reduction slope parameter according to the current vehicle speed, the current torque of the engine and the current torque of the driving motor. By the method, the current torque of the engine and the current torque of the driving motor are determined according to the vehicle signals, and then the torque reduction slope parameter is calculated by combining the current vehicle speed, so that the slope of torque reduction of the engine and the driving motor can be accurately determined, and the vehicle is decelerated more stably.

In addition, the embodiment of the invention also provides a storage medium, wherein the storage medium is stored with a vehicle torque reduction control program, and the vehicle torque reduction control program realizes the steps of the vehicle torque reduction control method when being executed by a processor.

Because the storage medium adopts all the technical schemes of all the embodiments, the storage medium has at least all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted here.

Referring to fig. 5, fig. 5 is a block diagram showing the construction of a first embodiment of a vehicle torque reduction control device according to the present invention.

As shown in fig. 5, a vehicle torque reduction control device according to an embodiment of the present invention includes:

the signal acquisition module 10 is used for acquiring a vehicle signal and a current vehicle speed when the vehicle is in a parallel mode and a deceleration instruction is received.

The parameter calculation module 20 is configured to determine a torque down slope parameter according to the vehicle signal and the current vehicle speed.

The vehicle control module 30 is configured to control the vehicle to slow down according to the torque reduction slope parameter.

In one embodiment, the parameter calculation module 20 is further configured to determine an engine current torque and a driving motor current torque according to the vehicle signal; and determining a torque reduction slope parameter according to the current vehicle speed, the current torque of the engine and the current torque of the driving motor.

In one embodiment, the parameter calculation module 20 is further configured to determine an engine torque signal and a driving motor torque signal based on the vehicle signal; determining the current torque of the engine according to the engine torque signal; and determining the current torque of the driving motor according to the driving motor torque signal.

In one embodiment, the parameter calculation module 20 is further configured to determine an engine torque slope based on the current engine torque and the current vehicle speed; determining a torque slope of the driving motor according to the current torque of the driving motor and the current vehicle speed; and determining a torque down slope parameter according to the engine torque slope and the driving motor torque slope.

In an embodiment, the parameter calculation module 20 is further configured to query an engine slope map according to the current vehicle speed and the current engine torque to obtain an engine torque slope.

In an embodiment, the parameter calculation module 20 is further configured to query a driving motor slope comparison table according to the current vehicle speed and the current torque of the driving motor to obtain a driving motor torque slope.

In an embodiment, the parameter calculation module 20 is further configured to determine that a deceleration command is received when the decrease in the opening of the accelerator pedal is detected when the vehicle is in the parallel mode, and send a signal acquisition command to the bus of the whole vehicle; and determining a vehicle signal and the current vehicle speed according to the feedback information of the whole vehicle bus.

It should be understood that the foregoing is illustrative only and is not limiting, and that in specific applications, those skilled in the art may set the invention as desired, and the invention is not limited thereto.

It should be noted that the above-described working procedure is merely illustrative, and does not limit the scope of the present invention, and in practical application, a person skilled in the art may select part or all of them according to actual needs to achieve the purpose of the embodiment, which is not limited herein.

In addition, technical details not described in detail in the present embodiment may refer to the vehicle torque reduction control method provided in any embodiment of the present invention, and are not described herein.

Furthermore, it should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. Read Only Memory)/RAM, magnetic disk, optical disk) and including several instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present invention.

The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims

1. The vehicle torque reduction control method is characterized by comprising the following steps of:

2. The vehicle torque down control method according to claim 1, wherein said determining a torque down slope parameter from said vehicle signal and said current vehicle speed comprises:

3. The vehicle torque reduction control method according to claim 2, wherein the determining the current torque of the engine and the current torque of the drive motor based on the vehicle signal includes:

4. The vehicle torque down control method according to claim 2, wherein the determining a torque down slope parameter according to the current vehicle speed, the current engine torque, and the current drive motor torque includes:

5. The vehicle torque reduction control method according to claim 4, wherein said determining an engine torque gradient from said current engine torque and said current vehicle speed comprises:

6. The vehicle torque reduction control method according to claim 4, wherein said determining a drive motor torque slope from said drive motor current torque and said current vehicle speed comprises:

7. The vehicle torque reduction control method according to claim 1, wherein the acquiring the vehicle signal and the current vehicle speed when the vehicle is in the parallel mode and a deceleration instruction is received includes:

8. A vehicle torque reduction control device, characterized by comprising:

9. A vehicle torque reduction control apparatus, characterized by comprising: a memory, a processor, and a vehicle torque reduction control program stored on the memory and running on the processor, the vehicle torque reduction control program configured to implement the vehicle torque reduction control method according to any one of claims 1 to 7.

10. A storage medium having stored thereon a vehicle torque reduction control program which, when executed by a processor, implements the vehicle torque reduction control method according to any one of claims 1 to 7.