CN108843783B

CN108843783B - Clutch control method for gear upshift of AMT (automated mechanical transmission)

Info

Publication number: CN108843783B
Application number: CN201810865820.5A
Authority: CN
Inventors: 田云; 黄利华; 姜震; 张晓龙; 张廉; 张剑轲
Original assignee: Chongqing Changan Automobile Co Ltd
Current assignee: Chongqing Changan Automobile Co Ltd
Priority date: 2018-08-01
Filing date: 2018-08-01
Publication date: 2020-05-08
Anticipated expiration: 2038-08-01
Also published as: CN108843783A

Abstract

The invention provides a clutch control method for an AMT transmission during upshifting, which is characterized in that an ECU acquires an accelerator position signal to identify the driving intention of a driver, and a TCU reasonably sets clutch control logic in the upshifting process, namely, an accelerator opening degree signal value in the gear shifting process is used as a relevant quantity for clutch control of the TCU. Compared with the prior art, the method increases the clutch control logic in the gear-up process, adopts different clutch separation combination targets selected under different accelerator opening degrees, shortens the gear-shifting time and the power interruption time by controlling in the clutch separation and combination processes, and effectively improves the driving feeling.

Description

Clutch control method for gear upshift of AMT (automated mechanical transmission)

Technical Field

The invention belongs to the field of control of a transmission of an automobile transmission system, and relates to a clutch control technology during upshift of the transmission.

Background

An AMT gearbox is one of many automatic transmissions, and due to inherent hardware constraints, the shift process has a long power interruption time. For AMT automobiles, smoothness of a gear shifting process is guaranteed, and rapidness of the gear shifting process is guaranteed. Therefore, it is a simple and feasible method to increase the shift speed by adding the clutch control logic without changing the structure of the vehicle. At present, in the gear shifting process of some AMT automobiles, the clutch control logic is too simple, and the gear shifting time is also increased.

In the AMT gear shifting process, after the TCU receives a target gear signal, the TCU controls the clutch to be separated, and then the gear is engaged and selected, and then the clutch is combined. The gear shifting process of a common AMT vehicle has the following characteristics: 1. the final separation target position and the initial separation target position of the clutch have no difference between a small accelerator and a large accelerator, and the large accelerator and the small accelerator are both one; 2. in the gear shifting process, the position of the clutch is kept unchanged while the gear shifting mechanism acts, and the clutch starts to act again after the gear shifting mechanism is successfully shifted; the above two points increase the shift time and the power interruption time of the AMT to different degrees.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a clutch control method during gear-up of an AMT (automated mechanical transmission), which shortens the gear-up time and the power interruption time of the AMT and effectively improves the driving feeling.

In order to solve the technical problems, the technical scheme of the invention is as follows:

a clutch control method in the process of gear-up of AMT transmission, the method generally says that ECU gathers the throttle position signal, discerns the driver's driving intention, TCU sets up the clutch control logic in the process of gear-up rationally, namely use the throttle opening degree signal value in the process of gear-shifting, as the relevant quantity that TCU carries on the clutch control, its step is as follows:

(1) the ECU collects an accelerator position signal, identifies the position of an accelerator pedal, and when a gear shifting point is reached, the TCU sends out an upshift signal and the engine simultaneously reduces the torque;

(2) the TCU selects and controls the clutch to a position target point A, B, C, D, E, F according to different accelerator opening degrees until the gear is static, the clutch is pressed, and the gear shifting is finished;

the setting of the position target point A, B, C, D, E, F is: the target point of initial clutch separation is called point A, the target point of clutch separation process is called point B, and the target point of final clutch separation is called point C; the clutch combination target point in the gear shifting is called a point D, and the clutch initial combination target point is called a point E; the clutch combination process target point is called as point F; during the upshifting process with different accelerator opening degrees, different target positions of point A, B, C, D, E, F are set.

The selection corresponding relation between the accelerator opening and the clutch position target point is as follows:

① the aim is to reduce the acceleration change rate and reduce the power interruption feeling of the driver when the accelerator is shifted to a large degree, when the accelerator is small, the target value of A point is small, which shows a large separation degree, when the accelerator is large, the target value of A point is large, which shows a small initial separation degree.

② the target value of point C is large when the small accelerator is accelerated to shift up, which indicates that the separation degree is small, the target value of point C is small when the large accelerator is accelerated to indicate that the initial separation degree is large, and the purpose is to shorten the clutch separation time of the medium and small accelerators and accelerate the gear shifting speed.

③ the C/D point target values are consistent when the small accelerator is accelerated to shift up, which means that the clutch position is not changed when the gear shifting mechanism is operated, the D point value is more than the C point value to different degrees when the large accelerator is accelerated to shift up, which means that the clutch is combined to different degrees when the large accelerator is shifted up, thereby shortening the clutch operation time and reducing the gear shifting time.

④ the target value of E/F point is small when the accelerator is accelerated to shift up, which shows that the combination degree is small, and the target value of E/F point is large when the accelerator is heavy, which shows that the initial combination degree is large, in order to shorten the clutch combination time of the accelerator and the heavy accelerator and accelerate the gear shift speed.

Compared with the prior art, the method increases the clutch control logic in the gear-up process, adopts different clutch separation combination targets selected under different accelerator opening degrees, shortens the gear-shifting time and the power interruption time by controlling in the clutch separation and combination processes, and effectively improves the driving feeling.

Drawings

FIG. 1 is a schematic diagram of a clutched state during an AMT upshift;

fig. 2 is a flowchart of AMT upshift clutch control.

Detailed Description

For a better understanding of the present invention, the present solution is described in detail below with reference to the following detailed description and accompanying drawings.

The invention relates to elements comprising an ECU, a TCU, a gearbox clutch position sensor and a gearbox shifting motor position sensor. And the accelerator opening signal value in the gear shifting process is used as a relevant quantity for clutch control of the TCU.

During an upshift, clutch position signal 100 indicates that the clutch is fully engaged and 0 indicates that the clutch is fully disengaged.

Referring to fig. 1, the clutch position target point is point A, B, C, D, E, F, which is: the target point of initial clutch separation is called point A, the target point of clutch separation process is called point B, and the target point of final clutch separation is called point C; the clutch combination target point in the gear shifting is called a point D, and the clutch initial combination target point is called a point E; the clutch engagement process target point is referred to as point F.

During the upshifting process with different accelerator opening degrees, different target positions of point A, B, C, D, E, F are set.

Referring to fig. 2, the clutch control method for the upshift process of the present invention includes the steps of:

1. the driver fixes the throttle opening for acceleration, the ECU collects throttle position signals, the position of a throttle pedal is identified, when a gear shifting point is reached, the TCU sends out a gear-up signal, the engine simultaneously reduces the torque, the TCU controls the clutch to be quickly separated to a point A, and a target value of the point A is obtained by looking up a table 1.

2. And slowly separating the clutch to a point B, obtaining a target value of the point B by looking up a table 1, and setting the separation rate according to the actual matching condition.

3. The clutch is quickly separated to the point C, the target value of the point C is obtained by looking up the table 1, and the gear shifting mechanism simultaneously executes the processes of selecting and engaging gears.

4. During the gear selecting and engaging process of the gear shifting mechanism, the clutch is pre-combined to the point D, and the target value of the point D is obtained by looking up a table 1.

5. The clutch is quickly combined to the point E, the target value of the point E is obtained by looking up the table 1, and the engine torque is recovered.

6. The clutch is quickly combined to the point F, the target value of the point F is obtained by looking up the table 1, and the engine torque is recovered.

7. The gear is static, the clutch is pressed, and the gear shifting is completed.

Table 1: corresponding relation between accelerator opening and clutch position target point

。

Claims

1. A clutch control method for the gear-up of AMT transmission is characterized in that the method uses the throttle opening signal value in the gear-shifting process as the relevant quantity of TCU to carry out clutch control, and comprises the following steps:

(2) the TCU selects and controls the clutch to a position target point A, B, C, D, E, F point according to different accelerator opening degrees until the gear is static, the clutch is pressed, and the gear shifting is finished;

the setting of the position target point A, B, C, D, E, F is: the target point of initial clutch separation is called point A, the target point of clutch separation process is called point B, and the target point of final clutch separation is called point C; the clutch combination target point in the gear shifting is called a point D, and the clutch initial combination target point is called a point E; the clutch combination process target point is called as point F; setting different target positions of A, B, C, D, E, F points in the process of upshifting with different accelerator opening degrees;

① the target value of point A is small when the accelerator is accelerated to shift up, and the target value of point A is large when the accelerator is large;

② the target value of point C is large when the accelerator is small and small when the accelerator is large;

③ the target values of C, D points are consistent when the small accelerator is accelerated and shifted up, and the value of D point is more than that of C point in different degrees when the large accelerator is accelerated and shifted up;

④ the target value of E, F point is small when the accelerator is small and the target value of E/F point is large when the accelerator is large.

2. The clutch control method for the upshift of the AMT transmission according to claim 1, wherein the selection correspondence relationship between the accelerator opening degree and the clutch position target point is as follows, and the TCU obtains the target value for controlling the clutch by looking up the table:

。