A car start control and start protection method based on CAN bus

Abstract

The invention discloses a CAN bus-based automobile starting control and starting protection method. The CAN bus module and the CAN bus combined instrument communicate through the CAN protocol; the ACC gear position, ON gear position and ST gear position signals of the ignition switch are input to the CAN bus respectively. In the combined instrument; the main power switch, starter relay, main switch of the starter power supply and the ON gear power control terminal of the engine ECU are connected to the CAN bus module, which is controlled by the CAN bus module; the neutral switch and the gear position signal of the rear cabin door switch are respectively input In the CAN bus module; according to the defined "Logical Relationship Strategy Table for Controlling Start and Start Protection", the logic control program is written on the basis of following the SAE J1939 agreement. The control settings can maximize the protection of each device in the starting system; at the same time, it improves the safety of the vehicle, prolongs the service life of the car starter, and reduces the maintenance cost of the car.

Description

technical field [0001] The invention relates to automobile starting control technology, in particular to an automobile starting control and starting protection method based on CAN bus. Background technique [0002] Automobile starting control and starting protection systems are one of the most important design concerns of vehicle manufacturers, especially commercial vehicles such as passenger cars and trucks that require high current starting. The key components that need to be protected when starting a car are the starter and the battery, but the driver’s misoperation causing the car to start the second time can easily cause the starter to rattle the teeth, or continuous starting causes the battery to feed power, etc., which will cause the vehicle to fail to start normally, and sometimes An accident happened. [0003] In the starting system, if the starter winding is ablated, the starting circuit is short-circuited, and the starting time is too long to cause the circuit to...

AI Technical Summary

Problems solved by technology

The key components that need to be protected when starting a car are the starter and the battery, but the driver’s misoperation causing the car to start the second time can easily cause the starter to rattle the teeth, or continuous starting causes the battery to feed power, etc., which will cause the vehicle to fail to start normally, and sometimes An accident happened

[0003] In the starting system, if the starter winding is ablated, the starting circuit is short-circuited, the starting time is too long and the circuit is heated, etc., it is very likely to cause a fire.

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