Function safety circuit for vehicle body control system, and control method

Abstract

The invention discloses a function safety circuit for a vehicle body control system, and a control method. According to the invention, a working state of an MCU module is monitored and judged through a monitoring module, when the MCU module is judged to normally work, the MCU module sends a pulse scanning signal to a combined switch drive module, and the combined switch drive module acquires the state information of a combined switch, and control signals are output to an output detection module according to the state information of the combined switch, and the output detection module controls front windscreen wipers, low-beam lamps and position lamps; and when the MCU module is judged to be failed, the output detection module acquires the state information of the combined switch, and the front windscreen wipers, the low-beam lamps and the position lamps are directly controlled through the combined switch. According to the invention, an MCU module monitoring method and a switch straight-through tube connection method are adopted, and when the MCU module is failed, the front windscreen wipers, the low-beam lamps and the position lamps can still be normally operated through the switch straight-through tube connection method. The function safety circuit has the functions of fault monitoring, early warning and alarming, and the like, meets the requirements of ISO26262 functional safety standards on vehicle body control, and guarantees personal and property safety.

Description

technical field [0001] The invention belongs to the technical field of automobile control function safety, and in particular relates to a function safety circuit and control method for a vehicle body control system. Background technique [0002] The ISO26262 automotive functional safety standard covers the overall development plan of automotive functional safety, and its scope of application includes chassis, powertrain and body. Excellent automotive electronics manufacturers at home and abroad design and develop vehicles based on the standards that their products meet the requirements of the ISO26262 automotive functional safety standard for the control of automotive electronic products. At present, the front wiper, low beam and position lamp of the car are all controlled by a set of control circuits, that is, the front wiper, low beam and position lamp are all controlled by the body controller. This control method has the following Problem, when the single chip microcompu...

AI Technical Summary

Problems solved by technology

At present, the front wiper, low beam and position lamp of the car are all controlled by a set of control circuits, that is, the front wiper, low beam and position lamp are all controlled by the body controller. This control method has the following Problem, when the single chip microcomputer or the main power supply of the body controller fails, the control of the front wiper, low beam and position lamp will be invalid, and the front wiper, low beam and position lamp cannot work normally, which will bring traffic problems Potential safety hazards, personal safety cannot be guaranteed

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