Coach electronic control engine starting protection circuit and control method thereof

Abstract

The invention discloses a coach electronic control engine starting protection circuit and a control method thereof. The protection circuit comprises a voltage stabilization module, a starting control circuit, a starter power supply control circuit and an engine. The voltage stabilization module converts the direct-current (DC) 24V voltage of a coach into DC 5V voltage, and the output end of the voltage stabilization module is connected with a single-chip microcomputer through a starting signal input circuit. The input end of the starting control circuit is connected with a power supply of the coach, and the output end of the starting control circuit is connected with the single-chip microcomputer and the T2 end of the starter and used for controlling starting of the starter. The input end of the starter power supply control circuit is connected with the power supply of the coach, and the output end is connected with the single-chip microcomputer and the T1 end of the starter. The engine comprises an engine electronic control unit (ECU), the engine ECU is connected with a controller area network (CAN) bus controller through a CAN bus, and the CAN bus controller is connected with the single-chip microcomputer through a physical lead. The starting circuit is high in self-safety, the service life of the electromagnetic switch and the starter is long, and maintaining cost is low.

Description

technical field [0001] The invention relates to an engine starting protection circuit, in particular to an electronically controlled engine starting protection circuit for passenger cars and a control method thereof. Background technique [0002] The passenger car starter has a large power, and the instantaneous working current can reach 600 amperes when starting. Long-term work will cause the cable to heat up, and the internal contacts of the starter will stick together. In severe cases, the circuit will catch fire. After the engine is started, repeated start operations may easily cause the starter gear and the engine flywheel to hit teeth, resulting in mechanical damage. [0003] The body of the bus is long and heavy, and the rear view is poor. Various accidents are prone to occur when the engine is started. For example, starting the engine when the gearbox is in gear will cause the vehicle to move forward or backward suddenly, which is prone to collision accidents; when ...

AI Technical Summary

Problems solved by technology

[0002] The power of the passenger car starter is large, and the instantaneous working current can reach 600 amperes when starting. Long-term work will cause the cable to heat up, and the internal contacts of the starter will stick together. In severe cases, it will cause the circuit to catch fire.

After the engine is started, repeated start operations may easily cause the starter gear and the engine flywheel to hit teeth, resulting in mechanical damage

[0003] The body of the bus is long and heavy, and the rear view is poor. Various accidents are prone to occur when the engine is started.

For example, starting the engine when the gearbox is in gear will cause the vehicle to move forward or backward suddenly, which is prone to collision accidents; when someone is doing maintenance work in the engine compartment, the driver suddenly starts the engine, which is likely to cause personal injury accidents to maintenance personnel

[0004] At present, my country's automobile emission standards have fully entered the National IV stage, and the engines used in passenger cars have all been upgraded to EFI engines with electronic control units (ECU). The engine ECU has a standard CAN bus interface, which meets the requirements of the SAE J1939 communication protocol. , there is no CAN bus-based electronically controlled engine start protection circuit for passenger cars

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