CAN bus system and control method thereof

Abstract

The invention relates to an automobile control system, especially to a CAN bus system and a control method thereof. The CAN bus system comprises an instrument module and a vehicle body control module. The instrument module includes a first controller; the vehicle body control module consists of a second controller, an output module and feedback modules; the first controller and the second controller are connected by a CAN bus; the output module and the feedback modules are connected with the second controller; and the output module is connected with switches of a plurality of control execution mechanisms. Multiple feedback modules are arranged; and one feedback module for detecting the state of each execution mechanism is connected to the access of the execution mechanism. With the system and method, the feedback result becomes accurate.

Description

technical field [0001] The invention relates to an automobile control system, in particular to a CAN bus system and a control method thereof. Background technique [0002] There are more and more electronic control systems and communication systems used in modern automobiles, such as engine electronic control systems, automatic transmission control systems, anti-lock braking systems (ABS), etc. Data exchange is required between the display instruments. If such a huge amount of data exchange is still used, the data cannot be shared, the wiring harness is complicated, the failure rate is high, and the maintenance is inconvenient. Therefore, the existing technology generally adopts CAN Bus system to realize data communication. [0003] The CAN bus system in the prior art mainly includes instrument module, vehicle body control module, wireless terminal, engine, gearbox and anti-lock braking system, the vehicle body control module is connected with the instrument module through ...

AI Technical Summary

Problems solved by technology

The body control module mainly includes an output module that controls the switch on the actuator and a feedback module that feeds back the status of the actuator. The actuators are mainly lights and wipers. One actuator is provided with a feedback module, so that when controlling multiple actuators for one switch, it is not known which actuator has a problem when the feedback module feedbacks a problem, making the feedback result inaccurate and clear; and because the rated current of the actuator There is still a difference with the rated current of the switch used to control the actuator, that is, the rated current of the switch may be 2A, while the rated current of the actuator is 1.5A, and the feedback module of the prior art is based on the rated current of the switch. It is set, so the feedback is the state of the switch, that is, whether the switch is overloaded, short-circuited, open-circuited, etc., but the state of the actuator cannot be accurately fed back, so the feedback result is not accurate

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