CN114251446B

CN114251446B - Gear shifting control method and device of AMT engine

Info

Publication number: CN114251446B
Application number: CN202111604775.6A
Authority: CN
Inventors: 孙文平; 陈彦波; 栾军山; 张晨
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2021-12-24
Filing date: 2021-12-24
Publication date: 2023-06-23
Anticipated expiration: 2041-12-24
Also published as: CN114251446A

Abstract

The application discloses a gear shifting control method and device of an AMT engine, which are used for acquiring accelerator opening information, current gear information and target gear information of a target vehicle; determining whether the target vehicle is in a downshift process with power demand according to the accelerator opening information, the current gear information and the target gear information; if the target vehicle is determined to be in the power-demand downshift process, adjusting an initial PID parameter value corresponding to a speed regulation stage in the power-demand downshift process to a target PID parameter value, and adjusting an initial smoke limit value corresponding to a torque returning stage in the power-demand downshift process to a target smoke limit value so as to accelerate the response rate of the power-demand downshift process; and further controlling the downshift process of the AMT engine according to the target PID parameter value and the target smoke limit value. The scheme accelerates the response speed in the power-demand downshift process, and ensures the power performance and the safety of the target vehicle during heavy load climbing or rapid overtaking.

Description

Gear shifting control method and device of AMT engine

Technical Field

The application relates to the field of automatic control, in particular to a gear shifting control method and device of an AMT engine.

Background

AMT is a short term for automatic gearbox (Automated Mechanical Transmission) of electric control machinery, which is an automatic speed changing system additionally provided with microcomputer control on the basis of a dry clutch and a gear speed changer.

In the actual running process of a vehicle, it is generally required to determine an optimal running gear of the vehicle according to the current actual running condition of the vehicle, the intention of a driver and the form environment, so as to perform gear shifting.

The gear shifting can be up-shifting or down-shifting, and the power interruption can occur in the down-shifting process of heavy-load climbing and overtaking of the existing heavy truck, so that the power loss is caused, and the driving safety is seriously influenced.

Disclosure of Invention

In order to solve the technical problems, the application provides a gear shifting control method and device of an AMT engine, which quickens the response speed in the power-demand gear-down process, further shortens the power interruption time, improves the power performance, and ensures the safety of a target vehicle during heavy-load climbing or rapid overtaking.

The embodiment of the application discloses the following technical scheme:

in a first aspect, an embodiment of the present application provides a shift control method of an AMT engine, the method including:

acquiring accelerator opening information, current gear information and target gear information of a target vehicle;

determining whether the target vehicle is in a power-demand downshift process according to the accelerator opening information, the current gear information and the target gear information;

if the target vehicle is determined to be in the power-demand downshift process, adjusting an initial PID parameter value corresponding to a speed regulation stage in the power-demand downshift process to a target PID parameter value, and adjusting an initial smoke limit value corresponding to a torque returning stage in the power-demand downshift process to a target smoke limit value so as to accelerate the response rate of the power-demand downshift process;

and controlling the downshift process of the AMT engine according to the target PID parameter value and the target smoke limit value.

Optionally, the determining whether the target vehicle is in a downshift process with power demand according to the accelerator opening information, the current gear information and the target gear information includes:

and if the target gear indicated by the target gear information is smaller than the current gear indicated by the current gear information and the accelerator opening indicated by the accelerator opening information is larger than a preset threshold, determining that the target vehicle is in a power-demand downshift process.

Optionally, the adjusting the initial PID parameter value corresponding to the speed regulation stage in the power-requiring downshift to the target PID parameter value, and adjusting the initial smoke limit value corresponding to the torque recovery stage in the power-requiring downshift to the target smoke limit value, includes:

triggering a state switch adjusting instruction, wherein the state switch adjusting instruction comprises a state quantity;

and the state switch is controlled to be switched from a first position to a second position through the state quantity, the first position corresponds to an initial PID parameter value and an initial smoke limit value, the second position corresponds to a target PID parameter value and a target smoke limit value, and the target PID parameter value and the target smoke limit value are configured in a calibrated mode in advance.

Optionally, the controlling the state switch to switch from the first position to the second position by the state quantity includes:

when the state quantity is set to 1, the state switch is controlled to be switched from the first position to the second position.

Optionally, before the adjusting the initial PID parameter value corresponding to the speed regulation stage in the power-required downshift process to the target PID parameter value and the adjusting the initial smoke limit value corresponding to the torque reduction stage in the power-required downshift process to the target smoke limit value, the method further includes:

and determining the target PID parameter value and the target smoke limit value according to the accelerator opening information.

In a second aspect, an embodiment of the present application provides a gear shift control device of an AMT engine, the device comprising:

the acquisition unit is used for acquiring accelerator opening information, current gear information and target gear information of the target vehicle;

the determining unit is used for determining whether the target vehicle is in a power-demand downshift process according to the accelerator opening information, the current gear information and the target gear information;

the adjusting unit is used for adjusting an initial PID parameter value corresponding to a speed regulation stage in the power-demand downshift process to a target PID parameter value if the target vehicle is determined to be in the power-demand downshift process, and adjusting an initial smoke limit value corresponding to a torque returning stage in the power-demand downshift process to a target smoke limit value so as to accelerate the response rate of the power-demand downshift process;

and the control unit is used for controlling the downshift process of the AMT engine according to the target PID parameter value and the target smoke limit value.

Optionally, the determining unit is configured to:

Optionally, the adjusting unit is configured to:

Optionally, the determining unit is further configured to:

and before the initial PID parameter value corresponding to the speed regulation stage in the power-demand downshift process is regulated to a target PID parameter value and the initial smoke limit value corresponding to the torque reduction stage in the power-demand downshift process is regulated to a target smoke limit value, determining the target PID parameter value and the target smoke limit value according to the accelerator opening information.

According to the technical scheme, the downshift process comprises a torque clearing stage, a speed regulating stage and a torque returning stage, the torque clearing speed mainly depends on the torque clearing speed, the speed regulating speed depends on the adjustment of PID parameter values, and the torque returning speed is limited by a torque returning slope and is also influenced by smoke limit values, so that the PID parameter values during speed regulating and the smoke limit values during torque returning can reduce the dynamics during climbing or overtaking, and the safety and the comfort during driving are influenced, and therefore, the gear shifting control method of the AMT engine provided by the application can acquire the accelerator opening information, the current gear information and the target gear information of a target vehicle; determining whether the target vehicle is in a downshift process with power demand according to the accelerator opening information, the current gear information and the target gear information; if the target vehicle is determined to be in the power-demand downshift process, adjusting an initial PID parameter value corresponding to a speed regulation stage in the power-demand downshift process to a target PID parameter value, and adjusting an initial smoke limit value corresponding to a torque returning stage in the power-demand downshift process to a target smoke limit value so as to accelerate the response rate of the power-demand downshift process; and further controlling the downshift process of the AMT engine according to the target PID parameter value and the target smoke limit value. Therefore, when the target vehicle is determined to be in the power-demand downshift process, the target PID parameter value and the target smoke limit value are adjusted to accelerate the response speed of the power-demand downshift process, so that the power interruption time is shortened, the power performance is improved, and the safety of the target vehicle during heavy load climbing or rapid overtaking is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive faculty for a person skilled in the art.

Fig. 1 is a schematic flow chart of a gear shift control method of an AMT engine according to an embodiment of the application;

FIG. 2 is a logic process example diagram of a gear shift control method of an AMT engine according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a downshift process of an AMT engine according to an embodiment of the present disclosure;

FIG. 4 is a comparison chart of a downshift process of an AMT engine according to an embodiment of the present disclosure;

fig. 5 is a block diagram of a gear shift control device of an AMT engine according to an embodiment of the application.

Detailed Description

In order to make the present application solution better understood by those skilled in the art, the following description will clearly and completely describe the technical solution in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

At present, the heavy truck can have power interruption in the heavy-load climbing and overtaking downshift processes, so that power loss is caused, and the driving safety is seriously influenced.

In view of the above technical problems, an embodiment of the present application provides a gear shift control method of an AMT engine, where the method may obtain accelerator opening information, current gear information, and target gear information of a target vehicle; determining whether the target vehicle is in a downshift process with power demand according to the accelerator opening information, the current gear information and the target gear information; if the target vehicle is determined to be in the power-demand downshift process, adjusting an initial PID (proportional, integral and derivative, proportion Integral Differential) parameter value corresponding to a speed regulation stage in the power-demand downshift process to a target PID parameter value, and adjusting an initial smoke limit value corresponding to a torque returning stage in the power-demand downshift process to a target smoke limit value so as to accelerate the response rate in the power-demand downshift process; and further controlling the downshift process of the AMT engine according to the target PID parameter value and the target smoke limit value. Therefore, when the target vehicle is determined to be in the power-demand downshift process, the target PID parameter value and the target smoke limit value are adjusted to accelerate the response speed of the power-demand downshift process, so that the power interruption time is shortened, the power performance is improved, and the safety of the target vehicle during heavy load climbing or rapid overtaking is ensured.

Note that, in the embodiment of the present application, the electronic control unit (Electronic Control Unit, ECU) on the target vehicle may be the one that executes the shift control method of the AMT engine.

Referring to fig. 1, a gear shift control method of an AMT engine according to an embodiment of the present application is described below, where the method includes:

s101, accelerator opening information, current gear information and target gear information of a target vehicle are acquired.

S102, determining whether the target vehicle is in a power-demand downshift process according to the accelerator opening information, the current gear information and the target gear information.

In the actual running process of a vehicle, it is generally required to determine an optimal running gear of the vehicle according to the current actual running condition of the vehicle, the intention of a driver and the form environment, so as to perform gear shifting. The gear shifting can be upshift or downshift, and the gear shifting under different running conditions has different requirements on power. For example, under the condition that power demands exist such as heavy load climbing and overtaking, the gear is shifted down, so that the power performance and the safety of the heavy load climbing and overtaking are ensured, the response efficiency of the gear shifting process is required to be accelerated, the power interruption time is shortened, and the power performance and the safety are ensured. And if the dynamic performance requirement is not high or no requirement exists, the response efficiency of the normal gear shifting process is used.

Based on this, in order to determine the appropriate response efficiency, the actual running condition of the target vehicle shift may be determined first. Therefore, in the embodiment of the application, the accelerator opening information, the current gear information and the target gear information of the target vehicle are acquired first, so that the actual running condition of the target vehicle, such as whether the target vehicle is in a power-demand downshift process, is determined according to the accelerator opening information, the current gear information and the target gear information.

The manner of determining whether the target vehicle is in a downshift process with power demand according to the accelerator opening information, the current gear information, and the target gear information may be to determine whether the downshift process is to be performed according to a magnitude relation between the target gear indicated by the target gear information and the current gear indicated by the current gear information. And determining whether the target vehicle has a power demand according to the accelerator opening indicated by the accelerator opening information. If the target gear indicated by the target gear information is smaller than the current gear indicated by the current gear information and the accelerator opening indicated by the accelerator opening information is larger than a preset threshold, it can be determined that the target vehicle is in a power-demand downshift process.

Referring to fig. 2, fig. 2 shows a logic process of a shift control method of an AMT engine, in which accelerator opening information, current gear information, and target gear information of a target vehicle may be acquired by an ECU, and whether the target vehicle is in a power-requiring downshift process is determined according to the accelerator opening information, the current gear information, and the target gear information.

And S103, if the target vehicle is determined to be in the power-demand downshift process, adjusting an initial PID parameter value corresponding to a speed regulation stage in the power-demand downshift process to a target PID parameter value, and adjusting an initial smoke limit value corresponding to a torque returning stage in the power-demand downshift process to a target smoke limit value so as to accelerate the response rate of the power-demand downshift process.

The engine of the AMT mainly comprises a torque clearing stage, a speed regulating stage and a torque returning stage in the gear shifting process (whether upshifting or downshifting) process, and the gear shifting process of the AMT engine is shown in fig. 3. The speed of torque is mainly dependent on the torque speed in the torque-clearing stage, the speed of speed regulation is regulated by means of PID parameter values, and the speed of torque is limited by the torque-returning slope and is also influenced by smoke limit values in the torque-returning stage, so that the PID parameter values in the speed regulation and the smoke limit values in the torque-returning stage can reduce the dynamic performance in climbing or overtaking, and the safety and the comfort in driving are influenced.

In the process of power-demand downshift, such as climbing or overtaking, the PID parameter value in the speed regulation stage can be adjusted to the target PID parameter value so as to accelerate the responsiveness; and the smoke limit value in the torque returning stage is reduced, so that the initial smoke limit value is adjusted to the target smoke limit value, the torque is quickly responded to the required torque, and the response speed of the downshift process with power requirement is further increased.

In this embodiment of the present application, the ways of adjusting the initial PID parameter value corresponding to the speed regulation stage in the power-requiring downshift to the target PID parameter value and adjusting the initial smoke limit value corresponding to the torque-reducing stage in the power-requiring downshift to the target smoke limit value may include various ways. In one possible mode, two downshift modes may be configured in advance, one being a normal downshift mode, the normal downshift mode corresponding to the initial PID parameter value and the initial smoke limit value, the other being a power-demand downshift mode, the power-demand downshift mode corresponding to the target PID parameter value and the target smoke limit value, mode switching being possible between the two modes, the mode switching being embodied by controlling the status switch to be placed at different positions. Referring to fig. 2, fig. 2 includes a first position and a second position, and when the status switch is placed in the first position, a downshift is performed using the normal downshift mode. When the status switch is placed in the second position, it indicates that the power-on downshift is performed in the power-on downshift mode.

In this case, one possible implementation of S103 may be that the ECU triggers a state switch adjustment instruction including a state quantity therein. The state quantity is used to indicate whether the target vehicle is in a power-requiring downshift event. The state switch is then controlled by the state quantity to switch from the first position to the second position. Referring to fig. 2, the pre-switch state switch is in a first position, where the state switch is represented by a dashed line (the dashed line between the two small circles in fig. 2), and the post-switch state switch is in a second position, where the state switch is represented by a solid line (the solid line between the two small circles in fig. 2). The first position corresponds to an initial PID parameter value and an initial smoke limit value, the second position corresponds to a target PID parameter value and a target smoke limit value, and the target PID parameter value and the target smoke limit value are configured in a calibrated mode in advance.

The state quantity may be represented by a numerical value, a symbol, or the like to indicate whether the target vehicle is in a downshift process with a power demand. Taking the state quantity as an example by numerical representation, the state quantity may be 0 or 1, if the state quantity is 0, it indicates that the target vehicle is in a normal downshift process, and if the state quantity is 1, it indicates that the target vehicle is in a downshift process with power demand. Therefore, in the embodiment of the present application, the manner in which the state switch is controlled from the first position to the second position by the state quantity may be to control the state switch to be switched from the first position to the second position when the state quantity is set to 1. Of course, the state quantity may be represented by other values, which are not limited in the embodiment of the present application.

In another possible implementation manner, if the target vehicle is in a downshift process with power demand, the target PID parameter value and the target smoke limit value may be determined in real time according to the power that may be required, so as to directly adjust the initial PID parameter value to the target PID parameter value, and adjust the initial smoke limit value to the target smoke limit value. The power which may be required can be represented by the accelerator opening information, and the larger the accelerator opening indicated by the accelerator opening information is, the larger the required power is, and the smaller the accelerator opening indicated by the accelerator opening information is, the smaller the required power is. Based on this, in the embodiment of the present application, before executing S103, the target PID parameter value and the target smoke limit value may be determined according to the accelerator opening information, and then the initial PID parameter value may be directly adjusted to the target PID parameter value, and the initial smoke limit value may be adjusted to the target smoke limit value.

It should be noted that, in the embodiment of the present application, different target PID parameter values and target smoke limit values corresponding to different accelerator opening information may be calibrated in advance, that is, the corresponding relationship between the accelerator opening information and the target PID parameter values and the target smoke limit values may be calibrated in advance.

S104, controlling the downshift process of the AMT engine according to the target PID parameter value and the target smoke limit value.

After the target PID parameter value and the target smoke limit value are obtained, the downshift process of the AMT engine can be controlled according to the target PID parameter value and the target smoke limit value, so that the response rate of the downshift process with power demand is accelerated.

This shift process is shown in fig. 4, where fig. 4 shows a comparison of the shift process of the AMT engine, and the solid line shows an example of the shift process with power demand performed according to the conventional method, and the broken line shows an example of the shift control method of the AMT engine provided according to the embodiment of the present application performing the shift process with power demand (mainly embodying the variation in response rate with respect to the conventional method). As can be seen from fig. 4, the response rate of the gear shift control method of the AMT engine provided by the embodiment of the application is obviously improved, so that the power interruption time is shortened, the power performance is improved, and the safety and the effective trafficability of the target vehicle during heavy load climbing and rapid overtaking are ensured.

Based on the foregoing embodiments, the present embodiment provides a gear shift control device of an AMT engine, referring to fig. 5, the device includes:

an acquiring unit 501, configured to acquire accelerator opening information, current gear information, and target gear information of a target vehicle;

a determining unit 502, configured to determine whether the target vehicle is in a downshift process with power demand according to the accelerator opening information, the current gear information, and the target gear information;

an adjusting unit 503, configured to, if it is determined that the target vehicle is in a downshift process with power demand, adjust an initial PID parameter value corresponding to a speed regulation stage in the downshift process with power demand to a target PID parameter value, and adjust an initial smoke limit value corresponding to a torque return stage in the downshift process with power demand to a target smoke limit value, so as to accelerate a response rate in the downshift process with power demand;

and a control unit 504, configured to control a downshift process of the AMT engine according to the target PID parameter value and the target smoke limit value.

Optionally, the determining unit is configured to:

Optionally, the adjusting unit is configured to:

Optionally, the determining unit is further configured to:

Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the above method embodiments may be implemented by hardware related to program instructions, where the above program may be stored in a computer readable storage medium, and when the program is executed, the program performs steps including the above method embodiments; and the aforementioned storage medium may be at least one of the following media: read-only memory (ROM), RAM, magnetic disk or optical disk, etc., which can store program codes.

It should be noted that, in the present specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment is mainly described in a different point from other embodiments. In particular, for the apparatus and system embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, with reference to the description of the method embodiments in part. The apparatus and system embodiments described above are merely illustrative, in which elements illustrated as separate elements may or may not be physically separate, and elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.

The foregoing is merely one specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A shift control method of an AMT engine, the method comprising:

2. The method according to claim 1, wherein the determining whether the target vehicle is in a power-requiring downshift process based on the accelerator opening information, the current gear information, and the target gear information includes:

3. The method of claim 1, wherein adjusting the initial PID parameter value corresponding to the speed regulation phase during the power-on downshift to the target PID parameter value and adjusting the initial smoke limit value corresponding to the torque recovery phase during the power-on downshift to the target smoke limit value comprises:

4. A method according to claim 3, wherein said controlling the switching of the status switch from the first position to the second position by the status quantity comprises:

5. The method of claim 1, wherein before adjusting the initial PID parameter value corresponding to the speed governing phase during the power-on downshift to the target PID parameter value and adjusting the initial smoke limit value corresponding to the torque returning phase during the power-on downshift to the target smoke limit value, the method further comprises:

6. A shift control device of an AMT engine, the device comprising:

7. The apparatus according to claim 6, wherein the determining unit is configured to:

8. The apparatus of claim 6, wherein the adjustment unit is configured to:

9. The apparatus of claim 8, wherein the adjustment unit is configured to:

10. The apparatus of claim 6, wherein the determining unit is further configured to: