Brake failure control method

Abstract

The invention discloses a brake fault control method. In the first step, a brake pressure signal is obtained, validity is judged, a vehicle effectively enters a normal driving state, if the vehicle does not enter a normal driving state, the step 2 is executed; in the second step, duration T1 of the invalid brake pressure signal is verified and compared with a wave filtering time T0 of a transmission control system, when the T1 is smaller than or equal to the T0, the vehicle enters a normal driving state, and when theT1 is larger than the T0, fault warning is carried out and the step 3 is executed; in the step 3, a brake pedal position signal is obtained, the validity is judged, if the signal is valid, the step 5 is executed, otherwise, the step 4 is executed; in the step 4, a replacement value is used for replacing the brake pressure signal; in the step 5, the duration T2 of the invalid brake pedal position signal is verified and compared with the wave filtering time T0 of the transmission control system, if the T2 is smaller than or equal to the T0, the step 4 is executed, and if the T2 is larger than the T0, the vehicle enters a fault mode. The method can ensure that the vehiclecan be normally driven when the brake pressure signal fails while the vehicle braking is normal, and the safety of a driver and the vehicle is ensured.

Description

technical field [0001] The invention relates to a braking fault control method. Background technique [0002] As one of the core components of the vehicle transmission system, the transmission has a significant impact on the power, fuel economy and ride comfort of the vehicle. Especially the dual-clutch automatic transmission (Dual Clutch Transmission referred to as DCT) developed in recent years has many advantages such as high transmission efficiency, no power interruption during the shifting process, good comfort, and good fuel economy. [0003] The fault diagnosis control logic is divided into two parts, one part refers to the real-time monitoring of the transmission hardware and signals by the transmission control system (TCU) to judge whether it is normal and reasonable; ) Some fault response measures made by the gearbox system, such as lighting the fault light, disengaging the clutch, entering limp mode, etc. [0004] The brake pressure signal and the brake pedal po...

AI Technical Summary

Problems solved by technology

The existing technology has the following two defects in the fault response measures after the brake pressure signal is invalid: 1. As long as the brake pressure signal fails, even if the vehicle can brake normally (the brake pedal position signal is normal), the TCU cannot recognize the driver braking intent, the transmission does not work properly, and the vehicle does not drive

2. After the brake pressure signal of the vehicle is restored, the vehicle cannot return to normal immediately. The vehicle must be stopped and turned off and the TCU can be restarted to recover. It is inconvenient to stop and turn off the engine on the highway or at the intersection of traffic lights

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