CN-116642008-B - Automatic transmission control method, device, equipment and storage medium

CN116642008BCN 116642008 BCN116642008 BCN 116642008BCN-116642008-B

Abstract

The invention discloses a control method, a device, equipment and a storage medium of an automatic transmission, wherein the method comprises the steps of judging that the working state of the automatic transmission is matched with an engine flameout matching condition if the state of an engine is a starting state and the rotating speed of an output shaft of the transmission is 0rpm, or judging that the rotating speed of an input shaft of the automatic transmission is larger than a first rotating speed threshold value and the duration time is a first time threshold value, judging that the rotating speed of the automatic transmission is smaller than a third rotating speed threshold value and the duration time is a second time threshold value if a gear is a forward gear or a reverse gear when the working state of the automatic transmission is matched with the engine flameout matching condition, judging that the rotating speed of the engine is smaller than the first rotating speed threshold value and the duration time is the second time threshold value if the gear is the forward gear or the reverse gear, and storing a flag bit corresponding to the flameout protection state when the automatic transmission is in the flameout protection state, and controlling the automatic transmission to be in the flameout protection mode.

Inventors

WANG MINGYU
NING JIAKUI
SUN PENGYUAN
LI JIALING
Sai Lichun
ZENG YUNPENG

Assignees

中国第一汽车股份有限公司

Dates

Publication Date: 20260505
Application Date: 20230712

Claims (8)

1. An automatic transmission control method, characterized by comprising: or the rotation speed of the transmission input shaft is larger than a first rotation speed threshold value and the duration time is a first time threshold value, and the rotation speed of the engine is larger than a second rotation speed threshold value and the duration time is the first time threshold value; judging that the working state of the automatic transmission is matched with the flameout matching condition of the engine; When the working state of the automatic transmission is matched with the engine flameout matching condition, if the gear is a forward gear or a reverse gear, judging whether the rotating speed of the engine is smaller than a third rotating speed threshold value or not and the duration is a second time threshold value; if yes, judging that the automatic transmission enters a flameout protection state; When the automatic transmission enters the flameout protection state, storing a zone bit corresponding to the flameout protection state, and controlling the automatic transmission to be placed in an engine flameout protection mode; when the flag bit corresponding to the flameout protection state is stored, the method further comprises the following steps: If the engine is not started and the UDS- $14 service information is received, the marker bit is cleared, and the automatic transmission is controlled to exit the engine flameout protection mode; when the flag bit corresponding to the flameout protection state is stored, the method further comprises the following steps: If the rotating speed of the engine reaches a fourth rotating speed threshold value, the effective torque of the engine is larger than a torque threshold value, the gear is in a forward gear, the vehicle speed is larger than a vehicle speed threshold value, the absolute value of the difference value between the rotating speed of the engine and the rotating speed of the transmission input shaft is smaller than a fifth rotating speed threshold value, and the duration is a third time threshold value; and clearing the flag bit and controlling the automatic transmission to exit the engine flameout protection mode.
2. The automatic transmission control method according to claim 1, characterized in that the automatic transmission when placed in the engine stall protection mode includes: If the engine is started, when the gear is a forward gear or a reverse gear, the clutch is controlled not to be filled with oil; And when the brake is in a release state and the accelerator is in an un-depressed state, the control prohibits the clutch from transmitting the engine torque.
3. The automatic transmission control method according to claim 1, characterized in that the automatic transmission when placed in the engine stall protection mode includes: If the engine is started, when the gear is a forward gear or a reverse gear, the clutch is controlled not to be filled with oil; and when the brake is in a release state and the accelerator is in a stepping state, if the rotating speed of the engine is greater than a sixth rotating speed threshold, controlling the pressure of the clutch by taking the expected rotating speed of the engine as a control target.
4. The automatic transmission control method according to claim 1, characterized by further comprising, before determining whether the operating state of the engine matches the engine stall protection condition: Judging whether normal communication can be performed between the engine control unit and the automatic transmission control unit, whether an automatic transmission sensor has no fault, whether an automatic transmission electromagnetic valve has no fault and whether the battery voltage is greater than a voltage threshold value; If yes, continuing to judge whether the working state of the engine is matched with the engine flameout protection condition.
5. The automatic transmission control method according to claim 1, characterized by further comprising, when the automatic transmission is placed in the engine stall protection mode: the control prohibits a pressure self-learning function of the automatic transmission and a torque converter lockup function.
6. An automatic transmission control apparatus, characterized by comprising an automatic transmission control unit configured to: or the rotation speed of the transmission input shaft is larger than a first rotation speed threshold value and the duration time is a first time threshold value, and the rotation speed of the engine is larger than a second rotation speed threshold value and the duration time is the first time threshold value; judging that the working state of the engine is matched with an engine flameout matching condition; when the working state of the engine is matched with the engine flameout matching condition, if the gear is a forward gear or a reverse gear, judging whether the rotating speed of the engine is smaller than a third rotating speed threshold value or not and the duration is a second time threshold value; if yes, judging that the automatic transmission enters a flameout protection state; When the automatic transmission enters the flameout protection state, storing a zone bit corresponding to the flameout protection state, and controlling the automatic transmission to be placed in an engine flameout protection mode; when the flag bit corresponding to the flameout protection state is stored, the method further comprises the following steps: If the engine is not started and the UDS- $14 service information is received, the marker bit is cleared, and the automatic transmission is controlled to exit the engine flameout protection mode; when the flag bit corresponding to the flameout protection state is stored, the method further comprises the following steps: If the rotating speed of the engine reaches a fourth rotating speed threshold value, the effective torque of the engine is larger than a torque threshold value, the gear is in a forward gear, the vehicle speed is larger than a vehicle speed threshold value, the absolute value of the difference value between the rotating speed of the engine and the rotating speed of the transmission input shaft is smaller than a fifth rotating speed threshold value, and the duration is a third time threshold value; and clearing the flag bit and controlling the automatic transmission to exit the engine flameout protection mode.
7. An electronic device comprising at least one processor, and a memory communicatively coupled to the at least one processor; The memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the automatic transmission control method according to any one of claims 1 to 5.
8. A computer-readable storage medium storing computer instructions for causing a processor to execute the automatic transmission control method according to any one of claims 1 to 5.

Description

Automatic transmission control method, device, equipment and storage medium Technical Field Embodiments of the present invention relate to engine control technologies, and in particular, to a method, an apparatus, a device, and a storage medium for controlling an automatic transmission. Background The automatic transmission has the function of preventing the engine from flameout protection in the product development process, when the engine speed is about to reach the idle speed target speed in the braking speed reduction or sliding speed reduction process of the vehicle, the automatic transmission can realize gear switching according to the speed reduction point of the transmission, the automatic transmission selects a lower gear and a gear with a larger speed ratio to drive through the transmission control unit, and the rotating speed of the engine is increased in the speed reduction process. During the off-going period of the vehicle, the automatic transmission reduces the torque transmission of the clutch to 0Nm, and the engine is maintained at idle only, waiting for the next start of the vehicle, since no load is applied to the engine side. In the starting process of the vehicle, the transmission control unit can slowly apply the clutch torque to the engine end by controlling the clutch pressure, and further control the torque applied to the engine end according to the deviation of the engine rotational speed and the target engine rotational speed, so that the torque of the engine end is stably and linearly transferred to the whole vehicle end. However, in an actual vehicle, due to the problem of the engine end, an engine stall state may occur in a creeping or starting stage of the vehicle, such as when the vehicle is completely consumed, an electrical fault exists on the engine side, the engine torque output is unstable, the lockup valve of the hydraulic torque converter of the transmission is stuck in a normally open state, and the transmission end rapidly loads excessive torque, so that the engine stall phenomenon may occur. Even if the engine is started again, the handle is hung into the D gear, and after the driver releases the brake, the engine can be flameout again, the vehicle cannot move in the cycle, and under the urban road, traffic jam can be caused, and vehicle safety accidents can be caused under the high-speed working condition. Disclosure of Invention The invention provides a control method, a device, equipment and a storage medium of an automatic transmission, which aim to reduce frequent flameout of an engine in a stop and start process. In a first aspect, an embodiment of the present invention provides an automatic transmission control method, including: or the rotation speed of the transmission input shaft is larger than a first rotation speed threshold value and the duration time is a first time threshold value, and the rotation speed of the engine is larger than a second rotation speed threshold value and the duration time is the first time threshold value; judging that the working state of the automatic transmission is matched with the flameout matching condition of the engine; When the working state of the automatic transmission is matched with the engine flameout matching condition, if the gear is a forward gear or a reverse gear, judging whether the rotating speed of the engine is smaller than a third rotating speed threshold value or not and the duration is a second time threshold value; if yes, judging that the automatic transmission enters a flameout protection state; when the automatic transmission enters the flameout protection state, a zone bit corresponding to the flameout protection state is stored, and the automatic transmission is controlled to be placed in an engine flameout protection mode. Optionally, after storing the flag bit corresponding to the flameout protection state, the method further includes: And if the engine is not started and the UDS- $14 service information is received, the flag bit is cleared, and the automatic transmission is controlled to exit the engine flameout protection mode. Optionally, after storing the flag bit corresponding to the flameout protection state, the method further includes: If the rotating speed of the engine reaches a fourth rotating speed threshold value, the effective torque of the engine is larger than a torque threshold value, the gear is in a forward gear, the vehicle speed is larger than a vehicle speed threshold value, the absolute value of the difference value between the rotating speed of the engine and the rotating speed of the transmission input shaft is smaller than a fifth rotating speed threshold value, and the duration is a third time threshold value; and clearing the flag bit and controlling the automatic transmission to exit the engine flameout protection mode. Optionally, the automatic transmission when placed in the engine stall protection mode includes: If the engine is started, when the gear is a forward