CN114572190A

CN114572190A - Torque control method in gear-up process and terminal equipment

Info

Publication number: CN114572190A
Application number: CN202110333117.1A
Authority: CN
Inventors: 王海澜; 王肖; 张磊
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2022-06-03

Abstract

The invention is suitable for the technical field of hybrid electric vehicles, and provides a torque control method and terminal equipment in a gear-up process, wherein the method comprises the following steps: determining the quick drop torque of the P2 motor and the crankshaft end of the engine needing to be reduced in the DCT upshifting process; controlling the P2 motor to respond to a torque drop and determining a device in the P2 motor and the K0 clutch that a torque drop limit is preferentially reached; calculating to obtain residual fast-decreasing torque according to the torque-decreasing limit and the fast-decreasing torque; and controlling the response of the equipment which is preferentially reached by the torque reduction limit and/or the equipment which does not reach the corresponding torque reduction limit of the residual quick torque reduction, so that the rotating speeds of the P2 motor and the engine are consistent with the rotating speed of the DCT input shaft, and further preventing the over-temperature damage caused by the overload of the K0 clutch.

Description

Method for controlling torque in gear-up process and terminal equipment

Technical Field

The invention belongs to the technical field of hybrid electric vehicles, and particularly relates to a torque control method and terminal equipment in a gear-up process.

Background

During the upshift process of a Dual Clutch Transmission (DCT), because the rotating speed of a DCT input shaft is suddenly reduced, the rotating speeds of a P2 motor and an engine need to be adjusted to be consistent with the DCT input shaft, the shaft end torques of the P2 motor and the engine need to be reduced (the reduced torque is a quick reduction torque, which is called as a quick reduction torque for short), meanwhile, the rotating speed difference between the P2 motor and the DCT input shaft is utilized to ensure that the wheel end torque output by the DCT is not changed, and simultaneously, the rotating speed of the P2 motor and the rotating speed of the engine are reduced to be consistent with the rotating speed of the DCT input shaft.

However, during a DCT upshift, excessive temperature damage to the K0 clutch may occur.

Disclosure of Invention

In view of this, embodiments of the present invention provide a method and a terminal device for torque control during an upshift process, so as to solve the problem in the prior art that a K0 clutch slip is heated and damaged due to over-temperature during a DCT upshift process.

A first aspect of an embodiment of the present invention provides a method for torque control during an upshift, including:

determining the quick drop torque of the P2 motor and the crankshaft end of the engine needing to be reduced in the DCT upshifting process;

controlling the P2 motor to respond to a torque drop and determining a device in the P2 motor and the K0 clutch that a torque drop limit is preferentially reached;

calculating to obtain residual fast-decreasing torque according to the torque-decreasing limit and the fast-decreasing torque;

and controlling the response of the equipment which preferentially reaches the residual quick drop torque from the drop torque limit and/or does not reach the corresponding drop torque limit, so that the rotating speeds of the P2 motor and the engine are consistent with the rotating speed of the DCT input shaft.

Optionally, the controlling the remaining fast drop torque to respond by the device that the torque drop limit is preferentially reached and/or the device that does not reach the corresponding torque drop limit includes:

and when the P2 motor and the K0 clutch do not reach the corresponding torque reduction limit, controlling the residual quick torque reduction to be responded by the P2 motor.

when the equipment for preferentially reaching the torque reduction limit is the P2 motor, the residual fast torque reduction is controlled to be responded by an engine.

Optionally, the controlling the response of the device in which the remaining fast drop torque is preferentially reached by the drop torque limit and/or the device which does not reach the corresponding drop torque limit includes:

when the device which is preferentially reached by the torque-down limit is the K0 clutch, the residual fast-falling torque is controlled to be jointly responded by the P2 motor and the engine.

Optionally, the controlling the residual fast-falling torque is responded by the P2 motor and the engine together, and includes:

the control responds to half of the residual fast-falling torque by the P2 motor and the engine respectively.

Optionally, after the controlling the residual fast-falling torque is responded by the P2 motor and the engine together, the method further includes:

determining the response torque limit when the P2 motor or the engine reaches a corresponding response torque limit during a half of the response to the remaining fast-decreasing torque;

the response torque limit is responded to by both the P2 motor and the engine.

A second aspect of an embodiment of the present invention provides an apparatus for torque control during an upshift, including:

the determining module is used for determining the quick reduction torque of the P2 motor and the crankshaft end of the engine needing to be reduced in the DCT upshifting process;

the control module is used for controlling the P2 motor to preferentially respond to the reduction of the torque;

the determination module is further configured to determine a device in the P2 motor and the K0 clutch that is preferentially reached by a torque reduction limit;

the calculation module is used for calculating and obtaining the residual quick drop torque according to the drop torque limit and the quick drop torque;

the control module is also used for controlling the response of the equipment with the residual quick-reducing torque preferentially reached by the torque-reducing limit and/or the equipment without reaching the corresponding torque-reducing limit, so that the rotating speeds of the P2 motor and the engine are consistent with the rotating speed of the DCT input shaft.

Optionally, the control module is further configured to control the residual fast-decreasing torque to be responded by the P2 motor when neither the P2 motor nor the K0 clutch reaches a corresponding torque-decreasing limit;

the control module is further used for controlling the residual quick-falling torque to be responded by an engine when the equipment which is preferentially reached by the falling torque limit is the P2 motor;

the control module is further used for controlling the residual fast-falling torque to be jointly responded by the P2 motor and the engine when the device with the priority reaching of the falling torque limit is the K0 clutch.

A third aspect of an embodiment of the present invention provides a terminal device, including: a memory, a processor and a computer program stored in the memory and executable on the processor, the processor when executing the computer program implementing the steps of the method of torque control during an upshift as described in any of the above embodiments.

A fourth aspect of an embodiment of the present invention provides a computer-readable storage medium, including: the computer readable storage medium stores a computer program which when executed by a processor implements the steps of the method of torque control during an upshift as described in any of the above embodiments.

Compared with the prior art, the embodiment of the invention has the following beneficial effects: according to the embodiment of the invention, the equipment which is required to reduce the torque of the P2 motor and the engine crankshaft end in the DCT upshifting process and the equipment which is required to reduce the torque and reaches the torque reduction limit preferentially are determined, and the equipment which reaches the torque reduction limit preferentially and/or the equipment which does not reach the corresponding torque reduction limit is controlled to respond to the residual fast torque reduction, so that the rotating speeds of the P2 motor and the engine are consistent with the rotating speed of the DCT input shaft, and the K0 clutch is prevented from being damaged due to over-temperature caused by overload.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic flow chart illustrating an implementation of a method for torque control during an upshift process according to an embodiment of the present invention;

FIG. 2 is an exemplary illustration of an arrangement for torque control during an upshift provided by an embodiment of the present invention;

fig. 3 is a schematic diagram of a terminal device according to an embodiment of the present invention.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

In order to explain the technical means of the present invention, the following description will be given by way of specific examples.

The inventor discovers that: in the DCT upshifting process, the P2 motor responds to the torque reduction preferentially, and as the torque at the wheel end of the DCT is kept unchanged under the control of the DCT, the torque reduction of the P2 motor is completely transmitted to the K0 clutch end, so that the load of the K0 clutch (the shaft end torque of the engine is the load of the K0 clutch) is increased, at the moment, the maximum capacity of the K0 clutch is possibly exceeded, and the situation that the K0 clutch is damaged due to over-temperature occurs. The present invention provides a method for controlling torque during an upshift process, which solves the above problems, and is illustrated in the flowchart of fig. 1, which is detailed as follows.

Step 101, determining a fast-falling torque required to reduce the torque of the P2 motor and the engine crankshaft end in the DCT upshifting process.

When the DCT does not upshift, the engine provides driving force, the P2 motor is responsible for generating power or assisting power, at the moment, the rotating speeds of the engine and the P2 motor are increased together, the P2 motor and the whole vehicle can be regarded as the load of the engine, the rotating speed is dragged by the engine to be increased, and the torque of the crankshaft end of the engine is the load of the K0 clutch.

During the DCT upshifting process, because the rotating speed of the DCT input shaft is suddenly reduced, the rotating speed of the P2 motor and the rotating speed of the engine need to be adjusted to be consistent with the rotating speed of the input shaft, so that the torque of the P2 motor and the crankshaft end of the engine needs to be reduced, and the torque to which the P2 motor and the engine need to be reduced is called fast-reduction torque.

And 102, controlling the P2 motor to respond to torque reduction and determining equipment which is preferentially reached by the torque reduction limit in the P2 motor and the K0 clutch.

After determining the fast ramp down torque, a response may be made by the P2 motor and the K0 clutch. And controlling the P2 motor to respond to the fast drop torque preferentially, wherein the rotating speeds of the engine and the P2 motor are reduced together, if the engine torque is consistent with the torque before the DCT is shifted, the K0 clutch torque is larger than the engine torque, and the rotating speed of the engine is reduced, and the part of the torque is caused by the P2 responding to the drop torque.

In the process of responding to the P2 motor and the K0 clutch, detecting which device of the P2 motor and the K0 clutch can preferentially obtain the corresponding torque reduction limit in real time, so that the P2 motor reaches the corresponding torque reduction limit, or the K0 clutch reaches the corresponding torque reduction limit, or the P2 motor and the K0 clutch cannot reach the corresponding torque reduction limit, and at the moment, the residual quick torque reduction response can be carried out according to the device preferentially reached by the torque reduction limit.

And 103, calculating to obtain the residual quick drop torque according to the drop torque limit and the quick drop torque.

And obtaining the residual fast dropping torque according to the difference obtained by subtracting the dropping torque limit from the fast dropping torque.

And 104, controlling the response of the equipment with the residual quick drop torque preferentially reached by the drop torque limit and/or the equipment without the corresponding drop torque limit, so that the rotating speeds of the P2 motor and the engine are consistent with the rotating speed of the DCT input shaft.

Since the engine torque capacity is greater than the maximum capacity of the K0 clutch, the engine torque request needs to be limited to match the maximum capacity of the K0 clutch, and a certain torque is usually reserved in consideration of the engine response accuracy and the response speed of the P2 motor and the engine when responding to the torque simultaneously, so that the torque requested by the engine is limited to be less than the maximum capacity of the K0 clutch. For example, the K0 clutch capacity parameter is 300Nm, the engine capacity parameter is (-50Nm to +370Nm), and therefore the engine requested torque may be limited in this embodiment to (-50Nm to +280Nm), (-50Nm to +270Nm), or (-50Nm to +290Nm), etc., so that there is no problem with the K0 clutch torque exceeding the corresponding torque down limit in response to the remaining fast ramp down torque from the engine.

When the device which is preferentially reached by the torque-down limit is the K0 clutch, the residual quick torque-down is controlled to be responded by the P2 motor and the engine together, and the torque-down limit state of the K0 clutch can be maintained.

In this embodiment, the controlling the residual fast drop torque by the P2 motor and the engine in response together may include: the P2 motor and the engine are controlled to respectively respond to half of the residual quick-drop torque, and the K0 clutch can be ensured to keep a limit state.

During the residual fast ramp-down torque of the P2 motor and the engine, respectively, in response to 1/2, when one of the P2 motor and the engine reaches a limit, both respond to the torque that the limit was first reached. Determining the response torque limit when the P2 electric machine or the engine reaches a corresponding response torque limit; the response torque limit is responded to by both the P2 motor and the engine.

According to the method for controlling the torque in the gear-up process, from the aspect of torque distribution, the quick-drop torque which is required to be reduced by determining the torque of the P2 motor and the crankshaft end of the engine in the DCT gear-up process is adopted; controlling the P2 motor to respond preferentially to torque-down and determining a device in the P2 motor and the K0 clutch that the torque-down limit is preferentially reached; calculating to obtain residual fast-decreasing torque according to the torque-decreasing limit and the fast-decreasing torque; and controlling the response of the equipment with the residual quick torque drop preferentially reached from the torque drop limit and/or the equipment without reaching the corresponding torque drop limit, so that the rotating speeds of the P2 motor and the engine are consistent with the rotating speed of the DCT input shaft, and the P2 motor is utilized to respond to the torque drop to the maximum extent, so that the advantage of quick response and high precision of the P2 motor is exerted.

It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by functions and internal logic of the process, and should not limit the implementation process of the embodiments of the present invention in any way.

Fig. 2 shows an example diagram of an apparatus for torque control during an upshift provided by an embodiment of the present invention, corresponding to the method for torque control during an upshift described in the above embodiment. As shown in fig. 2, the apparatus may include: a determination module 201, a calculation module 203 and a control module 202;

the determining module 201 is used for determining a fast dropping torque required to be dropped by the torque of the P2 motor and the crankshaft end of the engine in the DCT upshifting process;

the control module 202 is used for controlling the P2 motor to preferentially respond to torque reduction;

the determination module 201 is further configured to determine a device in the P2 motor and the K0 clutch that is preferentially reached by a torque reduction limit;

the calculation module 203 is configured to calculate a remaining fast droop torque according to the droop torque limit and the fast droop torque;

the control module 202 is further configured to control a response of the device that the residual fast-decreasing torque preferentially reaches from the torque-decreasing limit and/or the device that does not reach the corresponding torque-decreasing limit, so that the rotational speeds of the P2 motor and the engine are consistent with the rotational speed of the DCT input shaft.

The control module 202 controls the response of the device to which the remaining fast drop torque is preferentially reached by a droop limit and/or the device that does not reach a corresponding droop limit, for controlling the response of the remaining fast drop torque by the P2 motor when neither the P2 motor nor the K0 clutch reaches the corresponding droop limit.

The control module 202 controls the remaining fast droop torque to be responded by the engine when the device that the droop limit is preferentially reached is the P2 motor and/or when the device that the droop limit is preferentially reached does not meet the response of the device corresponding to the droop limit.

The control module 202 controls the residual fast droop torque to be responded by the P2 motor and the engine together when the device that the droop limit is preferentially reached is the K0 clutch and/or the device that the corresponding droop limit is not reached responds.

The control module 202 may be configured to control the residual fast-drop torque when the P2 electric machine and engine respond together:

After the control module 202 controls the residual fast-falling torque to be responded to by the P2 motor and engine together, further:

the response torque limit is responded to by both the P2 motor and the engine.

The device for controlling the torque in the gear-up process determines the quick torque reduction that the torques of the P2 motor and the engine crankshaft end need to be reduced in the DCT gear-up process through a determination module, and determines equipment that the torque reduction limit in the P2 motor and the K0 clutch is preferentially reached; according to the torque reduction limit and the fast reduction torque, a calculation module calculates to obtain a residual fast reduction torque; the control module is also used for controlling the response of the equipment with the residual quick drop torque preferentially reached from the torque reduction limit and/or the equipment without reaching the corresponding torque reduction limit, so that the rotating speeds of the P2 motor and the engine are consistent with the rotating speed of the DCT input shaft, the P2 motor is utilized to respond to the torque reduction to the maximum extent, and the advantage of quick response and high precision of the P2 motor is exerted.

Fig. 3 is a schematic diagram of a terminal device according to an embodiment of the present invention. As shown in fig. 3, the terminal device 300 of this embodiment includes: a processor 301, a memory 302 and a computer program 303 stored in said memory 302 and operable on said processor 301, such as a program for torque control during an upshift. The processor 301 executes the computer program 303 to implement the steps in the above-described method embodiment of torque control during an upshift, for example, steps 101 to 104 shown in fig. 1, and the processor 301 executes the computer program 303 to implement the functions of the modules in the above-described device embodiments, for example, the functions of the modules 201 to 203 shown in fig. 3.

Illustratively, the computer program 303 may be divided into one or more program modules that are stored in the memory 302 and executed by the processor 301 to implement the present invention. The one or more program modules may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program 303 in the apparatus for torque control during the upshift or in the terminal device 300. For example, the computer program 303 may be divided into the determining module 201, the calculating module 203, and the controlling module 202, and specific functions of the modules are shown in fig. 2, which are not described in detail herein.

The terminal device 300 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor 301, a memory 302. Those skilled in the art will appreciate that fig. 3 is merely an example of a terminal device 300 and does not constitute a limitation of terminal device 300 and may include more or fewer components than shown, or some components may be combined, or different components, for example, the terminal device may also include input output devices, network access devices, buses, etc.

The Processor 301 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 302 may be an internal storage unit of the terminal device 300, such as a hard disk or a memory of the terminal device 300. The memory 302 may also be an external storage device of the terminal device 300, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal device 300. Further, the memory 302 may also include both an internal storage unit and an external storage device of the terminal device 300. The memory 302 is used for storing the computer programs and other programs and data required by the terminal device 300. The memory 302 may also be used to temporarily store data that has been output or is to be output.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. . Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.

The above-mentioned embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims

1. A method of torque control during an upshift, comprising:

2. The method of torque control during an upshift as claimed in claim 1, wherein said controlling said remaining fast-falling torque to be responded by a device that is preferentially reached by a torque-down limit and/or a device that has not reached a corresponding torque-down limit comprises:

3. The method of torque control during an upshift as claimed in claim 1, wherein said controlling said remaining fast-falling torque to be responded by a device that is preferentially reached by a torque-down limit and/or a device that has not reached a corresponding torque-down limit comprises:

4. The method of torque control during an upshift as claimed in claim 1, wherein said controlling said remaining fast-falling torque to be responded by a device that is preferentially reached by a torque-down limit and/or a device that has not reached a corresponding torque-down limit comprises:

5. The method of in-upshift torque control according to claim 4, wherein said controlling said residual snap-down torque in response to said P2 motor and engine together comprises:

and controlling the P2 motor and the engine to respectively respond to half of the residual quick drop torque.

6. The method of in-upshift torque control according to claim 5, further comprising, after said controlling said residual snap-down torque is responded by said P2 motor and engine together:

the response torque limit is responded to by both the P2 motor and the engine.

7. An apparatus for torque control during an upshift, comprising:

the control module is used for controlling the P2 motor to preferentially respond to torque reduction;

the control module is also used for controlling the response of equipment with the residual quick-reducing torque preferentially reached by the torque-reducing limit and/or equipment without reaching the corresponding torque-reducing limit, so that the rotating speeds of the P2 motor and the engine are consistent with the rotating speed of the DCT input shaft.

8. The apparatus for torque control during an upshift as claimed in claim 7,

the control module is further configured to control the residual fast ramp down torque to be responded by the P2 motor when neither the P2 motor nor the K0 clutch reaches a corresponding ramp down limit;

9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 6 when executing the computer program.

10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.