CN117231733A - Low-temperature gear selection control method for automatic gearbox of light truck ATM - Google Patents
Low-temperature gear selection control method for automatic gearbox of light truck ATM Download PDFInfo
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- CN117231733A CN117231733A CN202311418846.2A CN202311418846A CN117231733A CN 117231733 A CN117231733 A CN 117231733A CN 202311418846 A CN202311418846 A CN 202311418846A CN 117231733 A CN117231733 A CN 117231733A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000008569 process Effects 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 abstract 2
- 230000007246 mechanism Effects 0.000 description 5
- 239000010687 lubricating oil Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The application relates to a low-temperature gear selection control method of an automatic gearbox of a light truck ATM, which is characterized in that under the low-temperature state, the recognition condition of the control is triggered, after the control is triggered, the gear selection position is returned to the initial position by actively removing the electric cylinder force, the target position is selected from the initial position only by the spring force, if the phenomenon that the target position is exceeded occurs, the gear selection is returned to the initial position again, and then the gear selection from the initial position is carried out again by reducing the electric cylinder force according to the percentage. The control method provided by the application mainly solves the problem that the vehicle power is interrupted and the vehicle cannot run due to failure in gear selection or overtime of gear selection of the AMT gearbox of the commercial vehicle in a low-temperature state.
Description
Technical Field
The application belongs to the technical field of gearbox control, and particularly relates to a low-temperature gear selection control method for an automatic gearbox of a light truck ATM.
Background
The main stream AMT gearbox structure of the current market matching light truck mainly uses a hydraulic control wet type multi-disc single clutch and uses an electric cylinder control gear selecting and shifting actuating mechanism as a core, and the main structure generally comprises the wet type multi-disc single clutch, a gearbox gear, an input shaft, an output shaft, a shell, lubricating oil, a hydraulic module, the electric cylinder, a gear selecting and shifting actuating mechanism, a sensor, a TCU electronic control unit and the like.
The main principle of the gear selecting and shifting working process in the structure is that after the TCU recognizes a gear change instruction, the TCU sends the instruction to the electric cylinder, and the electric cylinder works to push the gear selecting and shifting head to move so as to correspondingly push the gear selecting and shifting fork to move to a target position. Firstly, a gear selecting shifting head is pushed by a gear selecting electric cylinder to reach a target gear position, then the gear shifting head is pushed by a gear shifting electric cylinder, so that a shifting fork is pushed to reach a gear position, the part of control is similar to the gear shifting of a manual gear, firstly, a gear shifting lever is operated to translate to the target gear position, and then the gear shifting lever is pushed forwards or backwards to reach the target gear position.
The main principle of the gear-shifting working process is that after the TCU recognizes a gear-shifting instruction, the TCU sends a corresponding instruction to a gear-shifting electric cylinder, the gear-shifting electric cylinder is pushed to enable gear shifting to reach a middle position, a gear-selecting shifting head does not reach an initial position at the moment, and after the gear-selecting shifting head reaches the middle position, the gear-selecting shifting head is automatically pushed to the initial position by a return spring, so that gear shifting is carried out through the electric cylinder to be pushed to a neutral gear position in the gear-shifting control process, and gear selecting is automatically pushed to the initial position by the return spring.
The gear selecting and shifting actuating mechanism has the advantages that in the practical application process, as the circumference of the gear selecting and shifting head is filled with lubricating oil, the viscosity of the lubricating oil is reduced in a low-temperature environment, the moving resistance of the shifting head is increased, no matter the advancing direction or the retreating direction is obviously influenced, the advancing direction needs larger electric cylinder force to push the gear selecting and shifting head to reach a target position, the time for the retreating direction to return to the initial position is prolonged, the gear selecting control of the system is different in normal temperature and low temperature, the gear selecting and shifting control is more difficult in the low temperature state, the phenomenon that the gear selecting is not in place or the gear selecting is overtime is easy to generate, the gear shifting of the gearbox is failed, and the vehicle cannot run.
Disclosure of Invention
The application aims to provide a low-temperature gear selection control method for an automatic gearbox of a light truck ATM, which aims to solve the problem that the power of a vehicle is interrupted and the vehicle cannot run due to failure or overtime gear selection of an AMT gearbox of a commercial vehicle in a low-temperature state.
In order to achieve the above purpose, the application is realized by the following technical scheme:
a low-temperature gear selection control method for an automatic gearbox of a light truck ATM comprises the following steps:
s1, identifying a condition for achieving triggering of the control method;
s2, after the control method is determined to trigger, controlling the gear selecting electric cylinder force to be reduced to 0, and returning the gear selecting position to the initial position;
s3, setting the gear selecting cylinder according to the standard gear selecting cylinder force required by reaching the target position from the initial position, and if the target position is reached and the set time is maintained at the position, successfully selecting the gear;
if the actual position reached under the standard gear selecting cylinder force does not reach the target position, increasing the gear selecting cylinder force of the gear selecting cylinder until reaching the target position, and maintaining the set time at the position to finish gear selecting;
if the actual position exceeds the target position, the step S4 is entered;
s4, returning to the step S2, reducing the gear selecting cylinder force to 0, returning the gear selecting position to the initial position, reducing the standard gear selecting cylinder force of the step S3 according to the determined percentage, and if the gear selecting cylinder force reaches the target position and maintains the set time at the target position, successfully selecting the gear;
if the actual position does not reach the target position, increasing the gear selecting cylinder force of the gear selecting cylinder until the gear selecting cylinder force reaches the target position, and maintaining the set time at the position to finish gear selecting;
if the actual position exceeds the target position, repeating the step until the target position is reached;
and if the repetition times exceed the set times, the gear selection is considered to be failed.
Further, the triggering conditions of the control method are as follows:
s11, detecting that the ambient temperature or the oil temperature of the gearbox is smaller than a set value;
s12, selecting gears from high gear to low gear or from low gear to high gear.
Further, the control process selection gear position exceeds the target gear position and is larger than the set value.
Further, in step S2, it is determined that the gear selection position is returned to the initial position by the gear selection position being smaller than the set value or the time for the gear selection cylinder force to decrease to 0 being beyond the set value.
Further, in step S4, the percentage value=the displacement value exceeding the target/the total shift stroke.
Further, in step S4, the number of repetitions is not more than 4.
Further, the method also comprises the step that all control processes are completed within a specified time, and if the specified time is exceeded, the gear selection is considered to be failed.
The beneficial effects of the application are as follows:
the control method provided by the application mainly solves the problem that the vehicle power is interrupted and the vehicle cannot run due to failure in gear selection or overtime of gear selection of the AMT gearbox of the commercial vehicle in a low-temperature state.
Drawings
Fig. 1 is a gear layout schematic diagram of a 6-gear AMT gearbox of a certain electric cylinder driving gear selecting and shifting mechanism.
Detailed Description
The following detailed description of the present application is merely exemplary in nature and is not intended to limit the application to the precise form disclosed.
The application provides a low-temperature gear selection control method of an automatic gearbox of a light truck ATM, which is combined with a 6-gear AMT gearbox of a certain electric cylinder driving gear selecting and shifting executing mechanism, as shown in figure 1, and has the following main technical scheme:
s1, identifying a condition for achieving triggering of the control method:
1) Detecting a low temperature state, wherein the ambient temperature or the oil temperature of the gearbox is smaller than a set value;
2) Selecting a gear from a high gear to a low gear, such as when the gear is shifted down from 6 to 5 in fig. 1;
3) The selection range is from a low range to a high range, but during control the selection range exceeds the target range position and is greater than a set point, such as from 1 to 2, at which time the selection range should be from an initial position to selection range 1, but during control the selection range reaches or exceeds the selection range 1+ set point. The above steps 2) and 3) are only required to satisfy one.
S2, detecting control after triggering of the control method:
1) The gear selecting cylinder force is controlled to be reduced to 0, and at the moment, the gear selecting position can quickly return to the initial position due to the action of the spring force only.
2) Judging whether the gear is returned to the initial position, wherein when the gear selecting position is smaller than a set value (when the gear selecting initial position is reached) or the gear selecting cylinder force is reduced to 0, the time exceeds the set value (such as 300 ms);
the gear selecting position returns to the initial position, the next step is to select gear from the low position to the high position, and the process can adjust the position of the electric cylinder by actively adjusting the electric cylinder force.
S3, selecting gears from the initial positions:
setting the power of the gear selecting cylinder according to the standard gear selecting cylinder force (software standard quantity) required by reaching the target position from the initial position, and if the power reaches the target position and the set time is maintained at the target position, successfully selecting the gear;
if the actual position reached under the standard gear selecting cylinder force does not reach the target position, increasing the gear selecting cylinder force of the gear selecting cylinder until reaching the target position, and maintaining the set time at the position to finish gear selecting;
if the actual position exceeds the target position, the step S4 is entered;
s4, after returning to the initial position for the second time, continuously selecting gears from the initial position:
returning to step S2, the gear selection cylinder force is reduced to 0, the gear selection position is returned to the initial position, and the standard gear selection cylinder force of step S3 is reduced by a determined percentage, which is dependent on the ratio of the target position of the gear selection cylinder to the total gear selection stroke in step S3, i.e. percentage value = target displacement value exceeded/total gear selection stroke.
If the target position is reached and the set time is maintained at the position, the gear selection is successful;
if the actual position does not reach the target position, increasing the gear selecting cylinder force of the gear selecting cylinder until the gear selecting cylinder force reaches the target position, and maintaining the set time at the position to finish gear selecting;
if the actual position exceeds the target position, the step S4 is repeated until the target position is reached. The number of repeated execution is not more than 4, if the number exceeds 4, the gear selection day is considered to be failed.
The overall control process of the present application requires a prescribed time period, and if the prescribed time period is exceeded (e.g., the time period is longer than 2000ms, the gear selection is still failed.
The foregoing embodiments have described in detail the construction, features and effects of the present application, but the above embodiments are merely preferred embodiments of the present application, and the present application is not limited to the scope of the present application, and all changes made according to the concept of the present application or modifications made to the equivalent embodiments do not exceed the spirit covered by the specification.
Claims (7)
1. The low-temperature gear selection control method for the automatic gearbox of the light truck ATM is characterized by comprising the following steps of:
s1, identifying a condition for achieving triggering of the control method;
s2, after the control method is determined to trigger, controlling the gear selecting electric cylinder force to be reduced to 0, and returning the gear selecting position to the initial position;
s3, setting the gear selecting cylinder according to the standard gear selecting cylinder force required by reaching the target position from the initial position, and if the target position is reached and the set time is maintained at the position, successfully selecting the gear;
if the actual position reached under the standard gear selecting cylinder force does not reach the target position, increasing the gear selecting cylinder force of the gear selecting cylinder until reaching the target position, and maintaining the set time at the position to finish gear selecting;
if the actual position exceeds the target position, the step S4 is entered;
s4, returning to the step S2, reducing the gear selecting cylinder force to 0, returning the gear selecting position to the initial position, reducing the standard gear selecting cylinder force of the step S3 according to the determined percentage, and if the gear selecting cylinder force reaches the target position and maintains the set time at the target position, successfully selecting the gear;
if the actual position does not reach the target position, increasing the gear selecting cylinder force of the gear selecting cylinder until the gear selecting cylinder force reaches the target position, and maintaining the set time at the position to finish gear selecting;
if the actual position exceeds the target position, repeating the step until the target position is reached;
and if the repetition times exceed the set times, the gear selection is considered to be failed.
2. The method for controlling the low-temperature gear selection of the automatic gearbox of the light truck ATM according to claim 1, wherein the triggering condition of the control method is as follows:
s11, detecting that the ambient temperature or the oil temperature of the gearbox is smaller than a set value;
s12, selecting gears from high gear to low gear or from low gear to high gear.
3. The method of claim 2, wherein the control process selection position exceeds the target gear position and is greater than the set value.
4. The method according to claim 1, wherein in step S2, it is determined that the gear selection position is returned to the initial position by the gear selection position being smaller than a set value or the time during which the gear selection cylinder force is reduced to 0 being over a set value.
5. The method according to claim 1, wherein in step S4, the percentage value = the displacement value exceeding the target/the total shift stroke.
6. The method according to claim 1, wherein in step S4, the number of repetitions is not more than 4.
7. The method of claim 1, further comprising completing all control processes within a specified time, and if the specified time is exceeded, considering that the gear selection has failed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311418846.2A CN117231733A (en) | 2023-10-30 | 2023-10-30 | Low-temperature gear selection control method for automatic gearbox of light truck ATM |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311418846.2A CN117231733A (en) | 2023-10-30 | 2023-10-30 | Low-temperature gear selection control method for automatic gearbox of light truck ATM |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117231733A true CN117231733A (en) | 2023-12-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311418846.2A Pending CN117231733A (en) | 2023-10-30 | 2023-10-30 | Low-temperature gear selection control method for automatic gearbox of light truck ATM |
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| Country | Link |
|---|---|
| CN (1) | CN117231733A (en) |
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2023
- 2023-10-30 CN CN202311418846.2A patent/CN117231733A/en active Pending
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