CN115217963A

CN115217963A - Static active triggering type AMT clutch torque self-learning control method

Info

Publication number: CN115217963A
Application number: CN202210854335.4A
Authority: CN
Inventors: 陈大伟; 李朝富; 敬丹青; 徐世杰; 刘双平
Original assignee: Dongfeng Trucks Co ltd
Current assignee: Dongfeng Trucks Co ltd
Priority date: 2022-07-14
Filing date: 2022-07-14
Publication date: 2022-10-21

Abstract

The invention discloses a static active trigger type AMT clutch torque self-learning control method. The process is as follows: and actively triggering clutch torque self-learning, and controlling the highest gear of the static gearbox to self-learn the clutch torque when judging that self-learning conditions are met according to vehicle parameters. The method self-learns the transmission torque of the clutch in real time in the static state of the vehicle so as to update the transmission torque curve of the clutch in real time, ensure that the TCU can accurately adjust the transmission torque of the clutch in the starting and gear shifting processes according to the transmission torque curve, optimize the starting and gear shifting comfort of the vehicle, is suitable for learning a middle and low torque section within 1000Nm, and is simple.

Description

Static active triggering type AMT clutch torque self-learning control method

Technical Field

The invention belongs to the technical field of automobile control, and particularly relates to a static active triggering type AMT clutch torque self-learning control method.

Background

In order to ensure the smooth starting and gear shifting of the vehicle, the AMT gearbox needs to adjust the torque transmitted by the clutch in real time according to the torque transmission curve of the clutch in the starting and gear shifting processes of the vehicle. However, with the use of the clutch, the clutch torque transmission capacity is attenuated due to various factors such as high temperature, abrasion and durability, the theoretical clutch torque transmission curve is not applicable any more, and at the moment, the clutch torque transmission needs to be learned by self so as to update the clutch torque transmission curve.

At present, a TCU (transmission control unit) cannot update a clutch torque transmission curve in real time through self-learning, so that unexpected comfort of a vehicle is caused. Because a TCU (transmission control unit) cannot self-learn a clutch torque curve, the transmission torque of the clutch cannot be accurately controlled in the starting and gear shifting processes, various comfort problems such as vehicle starting impact, gear shifting impact, slow response of the clutch and the like can be caused, and the subjective feeling of a user is seriously influenced.

Disclosure of Invention

The invention aims to solve the defects in the background art and provide a simple and convenient static active triggering type AMT clutch torque self-learning control method.

The technical scheme adopted by the invention is as follows: a static active trigger type AMT clutch torque self-learning control method comprises the steps of actively triggering clutch torque self-learning, controlling the highest gear of a static transmission gear to carry out self-learning on clutch torque when judging that self-learning conditions are met according to vehicle parameters.

Further, the driver actively triggers clutch torque self-learning through a key.

Further, the service station actively triggers the off-clutch torque self-learning through an external diagnostic device.

Further, when the following conditions are all satisfied, judging that the self-learning condition is satisfied: 1) The vehicle is stationary; 2) The power supply voltage is in a voltage setting range; 3) Starting an engine; 4) Pulling up the hand brake; 5) The gearbox is in a neutral position; 6) The air inlet pressure of the clutch actuator is greater than the air pressure specified value; 7) There is no failure of gearbox, clutch electromagnetic valve and sensor.

Further, the self-learning process comprises the following steps: controlling the speed of the engine to be stably regulated to be higher than an idle speed designated value, slowly combining the clutch to maintain the net torque of the engine within a torque set range, controlling the displacement change rate of the clutch to be smaller than a set value and keeping for a designated time, and then recording the current displacement P1 of the clutch and the net torque T1 of the engine under the displacement of the clutch as self-learning values.

Further, the engine speed regulation is stabilized to 200rpm higher than the idling speed

Further, when the clutch is slowly combined, the combination rate of the clutch is 0.5mm/s-1.5mm/s.

Further, the torque setting range is [ T-50, T +50], which is a target clutch torque learning point.

Further, the specified time has a minimum value of 400ms.

Further, the set value is 0.1mm.

The method self-learns the transmission torque of the clutch in real time in the static state of the vehicle so as to update the transmission torque curve of the clutch in real time, ensure that the TCU can accurately adjust the transmission torque of the clutch in the starting and gear shifting processes according to the transmission torque curve, optimize the starting and gear shifting comfort of the vehicle, is suitable for learning a middle and low torque section within 1000Nm, and is simple and easy to implement.

Compared with passive triggering type learning, the static active triggering type learning method can actively trigger the clutch transmission torque curve in real time by standing on a service stand after a new clutch is replaced, and can immediately improve the smoothness of vehicle starting and gear shifting.

Drawings

FIG. 1 is a control flow chart of the present invention.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in FIG. 1, the invention provides a control method for torque self-learning of a static active triggering AMT clutch. And (3) recovering the vehicle state after learning is finished: the clutch is disengaged, the gearbox returns to neutral, and the engine returns to idle.

In the scheme, a driver actively triggers the clutch torque self-learning through a key or a service station through external diagnostic equipment.

In the above scheme, when the following conditions are all satisfied, it is judged that the self-learning condition is satisfied: 1) The vehicle is stationary; 2) The power supply voltage is in a voltage setting range, and the voltage setting range is 18-32V; 3) Starting an engine; 4) Pulling up the hand brake; 5) The gearbox is in a neutral position; 6) The air inlet pressure of the clutch actuator is greater than the air pressure designated value, and the air pressure designated value is 6bar; 7) There is no failure of gearbox, clutch solenoid valve and sensor.

In the above scheme, the self-learning process is as follows: controlling and adjusting the engine speed and stabilizing the engine speed to be higher than an idle speed designated value, slowly combining the clutch to maintain the net torque of the engine within a torque set range, controlling the displacement change rate of the clutch to be smaller than a set value and keeping the displacement change rate for a designated time, and recording the current displacement P1 of the clutch and the net torque T1 of the engine under the displacement of the clutch as self-learning values.

In the scheme, the speed of the engine is stably regulated to 200rpm higher than the idle speed

In the scheme, when the clutch is slowly combined, the combination rate of the clutch is 0.5-1.5mm/s.

In the above scheme, the torque setting range is [ T-50, T +50], where T is a target clutch torque learning point.

In the above scheme, the minimum value of the designated time is 400ms.

In the scheme, the set value is 0.05-0.1mm.

Example 1

In the embodiment, the driver actively triggers the clutch torque self-learning through the keys, and the set self-learning conditions comprise that: and setting the idle speed of the engine, putting the gearbox into a neutral position, activating a hand brake signal, controlling the voltage to be in a range of 18-32V, and controlling the air pressure of the air inlet of the clutch actuator to be greater than 6bar.

The learning process is as follows: the method is characterized in that the highest gear 14 of the gearbox is statically engaged, the engine speed is stably regulated to 200rpm higher than the idle speed, the clutch engagement rate is 0.8mm/s, the torque of a torque transmission point of a learning clutch is 300Nm, the net torque of the engine is respectively stabilized between 250 Nm and 350Nm, the displacement of the clutch is maintained for more than 400ms, and the displacement change rate of the clutch is less than 0.1mm in the period.

The current clutch displacement value P1, and thus the net engine torque T1 at that time, are recorded as P1=8.9mm, respectively, with T1=307Nm.

In this example, two clutch torque points are learned, i.e., P1=5.2mm, T1=1025Nm.

Example 2

In the embodiment, the service station actively triggers the clutch torque self-learning through the external diagnostic equipment, and the set self-learning conditions comprise that: and setting the idle speed of the engine, putting the gearbox into a neutral position, activating a hand brake signal, enabling the voltage to be in a range of 18-32V, and enabling the air inlet pressure of a clutch actuator to be larger than 6bar.

The learning process is as follows: the highest gear 14 of the gearbox is statically engaged, the engine speed is stably regulated to 200rpm higher than the idle speed, the clutch combination rate is 1.2mm/s, the torque of a torque transmission point of a learning clutch is 1000Nm, the net torque of the engine is respectively stabilized between 950 Nm and 1050Nm, the displacement of the clutch is maintained for more than 500ms, and the displacement change rate of the clutch in the period is less than 0.08mm.

The current clutch displacement value P1, and thus the net engine torque T1 at that time, are recorded as P1=5.2mm, respectively, with T1=1025Nm.

It should be understood that the specific order or hierarchy of steps in the processes disclosed is an example of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not intended to be limited to the specific order or hierarchy presented.

The foregoing description of the embodiments and specific examples of the invention have been presented for purposes of illustration and description; it is not intended to be the only form in which the embodiments of the invention may be practiced or utilized. The embodiments are intended to cover the features of the various embodiments as well as the method steps and sequences for constructing and operating the embodiments. However, other embodiments may be utilized to achieve the same or equivalent functions and step sequences.

In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, invention lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. To those skilled in the art; various modifications to these embodiments will be readily apparent, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "includes" is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when employed as a transitional word in a claim. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or".

The above description is only an embodiment of the present invention, but the scope of the present invention 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 invention are included in the scope of the present invention. Those not described in detail in this specification are well within the skill of the art.

Claims

1. A static active triggering type AMT clutch torque self-learning control method is characterized by comprising the following steps: and actively triggering clutch torque self-learning, and when judging that self-learning conditions are met according to vehicle parameters, controlling the highest gear of the static gearbox to be engaged, and carrying out self-learning on the clutch torque.

2. The static active triggered AMT clutch torque self-learning control method according to claim 1, wherein: the driver actively triggers the self-learning of the torque of the clutch through the keys.

3. The static active triggered AMT clutch torque self-learning control method of claim 1, wherein: the service station actively triggers the self-learning of the torque of the clutch through external diagnostic equipment.

4. The static active triggered AMT clutch torque self-learning control method according to claim 1, wherein the self-learning condition is judged to be satisfied when the following conditions are all satisfied: 1) The vehicle is stationary; 2) The power supply voltage is in a voltage setting range; 3) Starting an engine; 4) Pulling up the hand brake; 5) The gearbox is in a neutral position; 6) The air inlet pressure of the clutch actuator is greater than the air pressure specified value; 7) There is no failure of gearbox, clutch solenoid valve and sensor.

5. The static active triggered AMT clutch torque self-learning control method according to claim 1, wherein the self-learning process is as follows: controlling the speed of the engine to be stably regulated to be higher than an idle speed designated value, slowly combining the clutch to maintain the net torque of the engine within a torque set range, controlling the displacement change rate of the clutch to be smaller than a set value and keeping for a designated time, and then recording the current displacement P1 of the clutch and the net torque T1 of the engine under the displacement of the clutch as self-learning values.

6. The static active triggered AMT clutch torque self-learning control method of claim 5, wherein: the engine speed regulation is stabilized to 200rpm higher than the idle speed.

7. The static active triggered AMT clutch torque self-learning control method according to claim 5, wherein: when the clutch is slowly combined, the combination rate of the clutch is 0.5mm/s-1.5mm/s.

8. The static active triggered AMT clutch torque self-learning control method of claim 5, wherein: the torque setting range is [ T-50, T +50], which is a target clutch torque learning point.

9. The static active triggered AMT clutch torque self-learning control method of claim 5, wherein: the specified time has a minimum value of 400ms.

10. The static active triggered AMT clutch torque self-learning control method of claim 5, wherein: the stated value is 0.1mm.