Vehicle body controller fault control circuit and vehicle body control system

Abstract

The invention relates to a vehicle body controller fault control circuit and a vehicle body control system, and the vehicle body controller fault control circuit comprises a limp signal generation circuit which is connected with an MCU control unit and is used for generating a limp enable signal when the MCU control unit fails; the fail-safe control circuit is respectively connected with the limp signal generating circuit and a vehicle ignition switch so as to generate a fail-safe control signal; the first light turn-on circuit is connected with the fail-safe control circuit so as to control the turn-on of light; and the first switch control load opening circuit is connected with the fail-safe control circuit and the load control switch, and is used for generating a load control signal according to the fail-safe control signal and the switching signal of the load control switch, and controlling the opening of a corresponding load through a first relay based on the load control signal. When the MCU control unit breaks down, the functions of vehicle lamplight, windscreen wipers and the like can be turned on in time, the safety of the vehicle is guaranteed, and surrounding vehicles are reminded.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a fault control circuit of a body controller and a body control system. Background technique [0002] The car limp control circuit is for the reliable control of some important functions (such as lights, wipers and other loads) to prevent the loss of important functions due to the failure of the MCU control unit, which affects the safety of vehicle driving. In the prior art, when the MCU control unit fails, the watchdog is generally used to restart the MCU control unit. When the watchdog cannot receive the dog feeding signal from the MCU control unit, the watchdog controls the MCU by resetting. unit is reset. The problem with this approach is that if the MCU control unit has burned out or is short-circuited, this approach will fail, making it impossible to turn on loads such as lights and / or wipers. If loads such as lights and / or wipers cannot be turned on, the safety of the driver o...

AI Technical Summary

Problems solved by technology

This processing method has the following problems: if the MCU control unit is burned out or short-circuited, this method will fail, resulting in the inability to turn on loads such as lights and / or wipers

If loads such as lights and / or wipers cannot be switched on, the safety of the driver of the faulty vehicle cannot be guaranteed

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