CN114576353B

CN114576353B - Collaborative gear shifting method, system, vehicle and medium

Info

Publication number: CN114576353B
Application number: CN202210213515.4A
Authority: CN
Inventors: 陈彦波; 周海磊; 栾军山; 孙文平; 野凯轩
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2022-03-04
Filing date: 2022-03-04
Publication date: 2024-05-17
Anticipated expiration: 2042-03-04
Also published as: CN114576353A

Abstract

The application discloses a cooperative gear shifting method, a system, a vehicle and a medium, wherein the method is applied to the vehicle, the vehicle comprises an electronic control unit ECU and a transmission control unit TCU, and the method comprises the following steps: the ECU acquires a fault result of the engine, the ECU sends the fault result to the TCU, the TCU adopts a fault shift curve when the fault result causes limited torque of the engine, and the TCU adopts a default shift curve when the fault result does not cause limited torque of the engine, wherein the fault shift curve indicates that the rotating speed of the engine is higher than that of the transmission when the transmission is shifted, and the default shift curve indicates the rotating speed of the engine when the transmission is shifted. Therefore, when the engine has a torque limiting fault, the TCU shifts gears based on a fault shift curve, the output power of the engine can still be kept, and the power of the vehicle is ensured.

Description

Collaborative gear shifting method, system, vehicle and medium

Technical Field

The invention relates to the technical field of engines, in particular to a collaborative gear shifting method, a device, equipment, a vehicle and a medium.

Background

With the increasing comfort demands of people for driving vehicles, the popularity of mechanical automatic gearboxes (Automated Mechanical Transmission, AMT) on vehicles is increasing. Among them, the neutral coasting function of the AMT equipped vehicle is also widely used due to the advantages of its power and economy.

Typically, the AMT will upshift according to a calibrated shift curve, for example, when the engine speed reaches a certain speed (e.g., 1100 rpm/min), the gearbox upshifts. However, when the engine fails, for example, after the engine is limited in torque due to the failure, the output power of the engine at the original rotation speed (such as 1100 rpm/min) is reduced, and the power of the vehicle is weakened due to the up-down gear according to the original gear shifting curve. The weakening of the power of the vehicle affects not only the feeling but also the safety during running of the vehicle.

Disclosure of Invention

The application aims to provide a cooperative gear shifting method, a device, equipment, a vehicle and a medium, when an engine has a torque limiting fault, the output power of the engine can be still maintained, and the power of the vehicle is ensured.

In a first aspect, the present application provides a cooperative shift method applied to a vehicle including an electronic control unit ECU and a transmission control unit TCU; the method comprises the following steps:

the ECU acquires a fault result of the engine;

the ECU sends the fault result to the TCU;

when the fault result causes engine torque limitation, the TCU adopts a fault gear shifting curve;

When the fault result does not cause engine torque limitation, the TCU adopts a default gear shifting curve;

wherein the fault shift profile indicates that the rotational speed of the engine is higher when the transmission is shifted than the default shift profile indicates that the rotational speed of the engine is shifted.

As an alternative implementation manner, the ECU acquires a fault result of the engine, including:

The ECU acquires the fault type of the engine;

When the fault type hits in a preset type set, the ECU acquires a fault result which causes engine torque limitation.

As an alternative implementation, the method further includes:

and when the fault type is not hit in a preset type set, the ECU acquires a fault result which does not cause engine torque limitation.

As an alternative implementation, the method further includes:

When the ECU detects that the engine has a fault, a switching instruction is sent to the TCU;

The TCU switches to adopt a preset gear shifting curve according to the switching instruction;

the ECU acquires a failure type of the engine, including:

and when the ECU detects that the engine has the fault again, acquiring the fault type of the engine.

As an alternative implementation, the method further includes:

when the ECU detects again that the engine is not in the failure, it is determined that the engine is not in the failure.

In a second aspect, the present application provides a cooperative shift system comprising an ECU and a TCU;

the ECU is used for acquiring a fault result of the engine and sending the fault result to the TCU;

The TCU is used for adopting a fault gear shifting curve when the fault result causes the engine torque limit; when the fault result does not cause engine torque limitation, adopting a default gear shifting curve; wherein the fault shift profile indicates that the rotational speed of the engine is higher when the transmission is shifted than the default shift profile indicates that the rotational speed of the engine is shifted.

As an alternative implementation manner, the ECU is specifically configured to obtain a fault type of the engine; and when the fault type hits in a preset type set, acquiring a fault result which causes engine torque limitation.

As an optional implementation manner, the ECU is further configured to obtain a fault result that does not cause engine torque limitation when the fault type is not hit in a preset type set.

As an alternative implementation manner, the ECU is further configured to send a switching instruction to the TCU when detecting that there is a failure in the engine;

The TCU is also used for switching to adopting a preset gear shifting curve according to the switching instruction;

the ECU is specifically used for acquiring the fault type of the engine when the fault of the engine is detected again.

As an alternative implementation, the ECU is further configured to determine that the engine is not in the presence of the fault when detecting again that the engine is not in the presence of the fault.

In a third aspect, the present application provides a vehicle comprising an ECU, a TCU, an engine, and a transmission;

In a fourth aspect, the present application provides a computer readable storage medium for storing a computer program for performing the method of any one of the above.

Compared with the prior art, the technical scheme of the application has the advantages that:

The application provides a cooperative gear shifting method which can be applied to a vehicle, wherein the vehicle comprises an ECU and a TCU, and the method can be used for lifting and shifting the vehicle through cooperative cooperation of the ECU and the TCU so as to ensure the power of the vehicle. Specifically, the ECU obtains a failure result of the engine, and then sends the failure result to the TCU, when the failure result causes the engine to be limited to twist, in order to ensure the power of the vehicle, the TCU adopts a failure shift curve, and the failure shift curve is higher in rotation speed of the engine during shifting compared with a default shift curve, so that stronger power can be brought to the vehicle, even if the engine fails to cause the engine to be limited to twist, the power output of the vehicle can be ensured, and the influence of the power of the vehicle on the safety in the running process of the vehicle is reduced.

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, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an engine operating condition according to an embodiment of the present disclosure;

FIG. 2 is a flowchart of a cooperative gear shifting method according to an embodiment of the present application;

FIG. 3 is a schematic illustration of yet another engine operating condition provided by an embodiment of the present disclosure;

FIG. 4 is a flowchart of an ECU and TCU coordinated shift method provided by an embodiment of the application;

fig. 5 is a schematic diagram of a cooperative gear shifting system according to an embodiment of the present application.

Detailed Description

In order to make the present application better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings, 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 those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Technical terms related to the present application will be described first.

Engine torque limiting refers to limiting the torque that results in the engine output to a fixed value when the engine fails. As shown in fig. 1, the present disclosure provides a schematic diagram of an engine operating condition according to an embodiment of the present disclosure. Wherein curve a shows the variation curve of the output torque and the rotation speed when the engine is not caused to be limited in torsion, namely, when the engine is normal, and curve B shows the output torque fixed at a fixed value (such as 1600 nm in fig. 1) when the engine is caused to be limited in torsion.

When the engine fails to cause the engine to be limited in torque, the torque output by the engine is reduced, and under the condition that the engine rotating speed is fixed, the output power of the engine is reduced, so that the power of the whole vehicle is insufficient. Therefore, the vehicle can have a driving feeling of greatly reduced power, and meanwhile, due to the greatly reduced power, a certain risk exists for the safety of the vehicle in the driving process.

In view of the above, the embodiment of the application provides a cooperative gear shifting method, which is applied to a vehicle, wherein the vehicle comprises an ECU and a TCU, and the gear is upgraded by cooperative control of the ECU and the TCU. Specifically, the method comprises the following steps: the ECU acquires a fault result of the engine and sends the fault result to the TCU, when the fault result causes the engine to be limited, the TCU adopts a fault gear shifting curve, and when the fault result does not cause the engine to be limited, the TCU adopts a default gear shifting curve, wherein the fault gear shifting curve indicates that the rotating speed of the engine is higher than that of the default gear shifting curve when the transmission is shifted, and the rotating speed of the engine is higher than that of the default gear shifting curve when the transmission is shifted.

When the fault result leads to engine torque limiting, the TCU adopts a fault gear shifting curve, and compared with a default gear shifting curve, the fault gear shifting curve has higher rotating speed of the engine during gear shifting, so that stronger power can be brought to the vehicle, even if the engine fault leads to torque limiting, the power output of the vehicle can be ensured, and the influence of the power of the vehicle on the safety of the vehicle in the running process of the vehicle is reduced.

In order to make the technical scheme of the application clearer and easier to understand, the cooperative gear shifting method provided by the embodiment of the application is described below in terms of ECU and TCU angles. As shown in fig. 2, the present application provides a flowchart of a collaborative gear shifting method, which includes:

s201, the ECU acquires a fault result of the engine.

In some embodiments, a set of preset types may be pre-established, where each failure type in the set of preset types may cause engine torque limiting, e.g., when the engine type is an emissions overrun of the engine, the engine torque limiting may be caused. As another example, the type of fault is a line short or open circuit and does not result in engine torque limiting.

Based on the above, the ECU can acquire the fault type of the engine, then search the fault type of the engine in a preset type set, and if the fault type of the engine hits in the preset type, the ECU acquires a fault result which causes the torque limit of the engine; when the fault type does not hit in the preset set, the ECU acquires a fault result which does not cause engine torque limitation.

S202, the ECU starts the fault result to the TCU.

And S203, when the fault result causes the engine torque limit, the TCU adopts a fault gear shifting curve.

And S204, when the fault result does not cause the engine torque limit, the TCU adopts a default gear shifting curve.

Wherein the faulty shift curve indicates that the rotational speed of the engine is higher than the default shift curve when the transmission is shifted.

Referring to FIG. 3, a schematic diagram of yet another engine operating condition is provided in accordance with an embodiment of the present application. Wherein curve C represents the output power of the engine when no engine torque limit is caused; curve D represents the output power of the engine after the engine torque limit is caused.

As can be seen from fig. 3, when the output power of the engine is the same, the engine is limited and then the engine is not limited and then the engine is limited and then the engine needs to rotate at a higher speed to provide the output power when the engine is limited and not limited. Based on this, in order to secure the power of the vehicle, the engine may be made to provide a higher output power by changing the rotational speed of the engine.

Therefore, when the engine is limited to be twisted, the TCU performs lifting gear according to a fault gear shifting curve, namely, performs lifting gear when the rotation speed of the engine is high, so that the power of the vehicle is ensured; when the engine torque limit is not caused, the TCU performs up-down gear according to a default gear shifting curve.

Based on the above description, the embodiment of the application further provides an ECU and TCU collaborative gear shifting method, referring to fig. 4, which is a flowchart of the ECU and TCU collaborative gear shifting method provided by the embodiment of the application, where the method includes:

S401, the ECU diagnoses the fault of the engine, if no fault exists, the TCU selects a default gear shifting curve, and if the fault exists, S402 is executed.

S402, the ECU determines whether the engine fault needs to change the operation interval and confirms again, if so, S403 is executed, otherwise S404 is executed.

S403, the ECU sends the relevant information of the engine fault to the TCU, and the TCU is switched to a preset gear shifting curve.

In some examples, a preset shift curve indicates that the rotational speed of the engine is higher than the default shift curve when the transmission is shifted, i.e., the operating range of the engine may be increased using the preset shift curve. In other examples, a preset shift profile indicates that the rotational speed of the engine is lower than the default shift profile when the transmission is shifted, i.e., the operating range of the engine may be reduced using the preset shift profile.

S404, the ECU diagnoses the fault of the engine again, if no fault exists, the driving cycle does not perform the third fault diagnosis, the TCU selects a default gear shifting curve, and otherwise, S405 is executed.

After the running interval of the engine is changed, the fault of the engine is diagnosed in the changed running interval, so that the diagnosis error is further reduced, the diagnosis accuracy is improved, and the error reporting risk is reduced.

S405, the ECU determines the engine fault.

S406, the ECU judges whether the engine fault causes engine torque limitation, if yes, S407 is executed, and if not, the TCU selects a default gear shifting curve.

S407, the ECU instructs the TCU to select a fault gear shifting curve.

The default gear shifting curve, the fault gear shifting curve and the preset gear shifting curve can be calibrated according to actual needs.

In the method, firstly, the fault diagnosis of the engine is carried out, when no fault is confirmed, the AMT adopts a default gear shifting curve, when the fault of the engine is diagnosed, the ECU confirms whether the cooperative diagnosis of the gearbox is needed or not according to the related information of the fault of the engine, and if not, the fault is directly confirmed; if the engine fault is not detected, the ECU does not carry out a third fault diagnosis in the driving cycle, and the ECU indicates the TCU to recover the default gear shifting curve; if the engine fault still exists after the re-diagnosis, the engine fault is confirmed.

In this embodiment, by combining the engine fault diagnosis process with the gear shifting curve of the gearbox, through mutual cooperation of the ECU and the TCU, a fault with low diagnosis precision in a common running area of the engine is diagnosed, and through cooperative control of the TCU, the running area of the engine is changed (for example, the running area is increased or the running area is reduced), the fault is diagnosed again, the fault diagnosis precision is increased, and the risk of false alarm is reduced.

Further, whether the engine fault is directly confirmed by the ECU or is confirmed through TCU cooperation, after confirming that the engine fault exists, the ECU confirms whether the fault causes engine torque limitation according to processing measures corresponding to the engine fault, if no torque limitation exists, the ECU indicates the TCU to adopt a default gear shifting curve, and if the torque limitation exists, the ECU indicates the TCU to switch into the fault gear shifting curve. When the engine is limited to be twisted due to faults, the TCU can enable the requirement of the driving process on the power of the engine to be met as much as possible under the condition of engine torque limitation through adjusting a gear shifting curve.

Referring to fig. 5, a schematic diagram of a cooperative gear shifting system according to an embodiment of the present application is provided, where the cooperative gear shifting system includes an ECU and a TCU;

The embodiment of the application provides a vehicle, which comprises an ECU, a TCU, an engine and a transmission;

The embodiment of the application provides equipment, which comprises a processor and a memory:

the memory is used for storing a computer program and transmitting the computer program to the processor;

The processor is configured to execute the cooperative shift method described in the above embodiment according to instructions in the computer program.

An embodiment of the present application provides a computer-readable storage medium for storing a computer program for executing the cooperative shift method described in the above embodiment.

In this 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 mainly describes differences from other embodiments. In particular, for the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments for relevant points. The apparatus embodiments described above are merely illustrative, wherein the units and modules illustrated as separate components may or may not be physically separate. In addition, some or all of the units and modules can be selected according to actual needs to achieve the purpose of the embodiment scheme. Those of ordinary skill in the art will understand and implement the present invention without undue burden.

The foregoing is merely illustrative of the embodiments of this application and it will be appreciated by those skilled in the art that variations and modifications may be made without departing from the principles of the application, and it is intended to cover all modifications and variations as fall within the scope of the application.

Claims

1. A cooperative gear shifting method, characterized by being applied to a vehicle including an electronic control unit ECU and a transmission control unit TCU; the method comprises the following steps:

When the ECU detects that the engine has the fault again, acquiring the fault type of the engine;

The ECU acquires a fault result of the engine based on the fault type;

the ECU sends the fault result to the TCU;

2. The method of claim 1, wherein the ECU obtaining a failure result of an engine based on the failure type comprises:

3. The method of claim 1, wherein the ECU obtaining a failure result of an engine based on the failure type comprises:

4. The method according to claim 1, wherein the method further comprises:

5. A cooperative gear shifting system, comprising an ECU and a TCU;

the ECU is used for sending a switching instruction to the TCU when detecting that the engine has a fault;

the TCU is used for switching to a preset gear shifting curve according to the switching instruction;

The ECU is used for acquiring the fault type of the engine when the fault of the engine is detected again; obtaining a fault result of the engine based on the fault type and sending the fault result to the TCU;

6. The system of claim 5, wherein the ECU is specifically configured to obtain a fault result that results in engine torque limiting when the fault type hits in a set of preset types.

7. The system of claim 5, wherein the ECU is specifically configured to obtain a failure result that does not cause engine torque limiting when the failure type is not hit in a preset set of types.

8. A vehicle comprising an ECU, a TCU, an engine, and a transmission;

9. A computer readable storage medium, characterized in that the computer readable storage medium is adapted to store a computer program adapted to perform the method of any of claims 1-4.