Method and device for controlling failure of input shaft speed sensor in automotive AMT (automated mechanical transmission)

Abstract

The invention provides a method for controlling failure of an input shaft speed sensor in an automotive AMT (automated mechanical transmission) and a control device for the implementation of the method. The method includes: using a product of a gear transmission ratio of transmission input shaft speed and a transmission gear transmission ratio as a transmission input shaft speed when the transmission input shaft speed sensor fails, and calculating slip of a clutch according to the transmission input shaft speed. The control method comprises a transmission input shaft speed sensor failure diagnosis unit and a clutch slip acquisition unit, wherein the units are connected with each other. The method and the device have the advantages that when the transmission input shaft speed sensor fails, the value approximate to the transmission input shaft speed can be acquired; the obtained slip of clutch and the obtained engaging speed of clutch are accurate, and the problem that the failure of the transmission input shaft sensor causes greatly reduced vehicle comfort and safety is solved.

Description

technical field [0001] The invention belongs to the technical field of automobile transmission and relates to a control method for sensor failure. Background technique [0002] In a vehicle equipped with an automatic mechanical transmission (AMT), when the clutch is engaged, the transmission input shaft speed sensor is used to detect the speed of the transmission input shaft, and the difference between the speed of the active part of the clutch and the speed of the transmission input shaft is calculated in turn, and then Control clutch engagement. Therefore, once this sensor fails, the calculation result of the difference between the rotational speed of the active part of the clutch and the rotational speed of the transmission input shaft will be wrong, so that the controlled clutch pressure will be inaccurate, which will easily cause the vehicle to shake, and even the engine will appear in severe cases. Power interruptions such as flameout may affect the comfort of the occ...

AI Technical Summary

Problems solved by technology

Therefore, once this sensor fails, the calculation result of the difference between the rotational speed of the active part of the clutch and the rotational speed of the transmission input shaft will be wrong, so that the controlled clutch pressure will be inaccurate, which will easily cause the vehicle to shake, and even the engine will appear in severe cases. Power interruptions such as flameout may affect the comfort of the occupants in the vehicle, or the vehicle cannot continue to drive, or seriously affect the safety of the vehicle

[0003] When the above-mentioned transmission input shaft sensor failure occurs, some control methods in the prior art are to gradually disengage the clutch and finally stop the vehicle, causing inconvenience to the drivers and passengers.

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