Automobile engine start control system and control method thereof

Abstract

The invention discloses an automobile engine start control system and a control method thereof. The automobile engine start control system comprises an ignition key, a starting motor, a storage battery, a starting relay, an engine electric control unit, an automatic gearbox control unit and an automobile body controller, wherein the starting relay is electrically connected with the starting motorand the storage battery respectively; the engine electric control unit and the automatic gearbox control unit are respectively connected with the automobile body controller via a CAN (controller areanetwork) bus; and the starting relay and the ignition key are connected with the automobile body controller. The control method of the automobile engine start control system is characterized in that a BCM (body control module) obtains an engine speed signal and the gear position of a gearbox and carries out logical judgment according to the engine speed and the gear position of the gearbox so as to control the starting relay to be closed or opened and further control the starting motor to be started. The automobile engine start control system and the control method thereof provided by the invention have the advantages of realizing intelligent engine start control, guaranteeing the safety of vehicles and users when the engine is started, and providing protection for the starting motor and the storage battery.

Description

technical field [0001] The invention relates to an automobile engine starting control system and a control method. Background technique [0002] The car engine is driven by the on-board DC starter motor to rotate the flywheel of the engine to achieve starting. figure 1 It is a structural diagram of the engine starting control system. The starting process of the engine is as follows: when the ignition key rotates from the ON gear to the START gear, the ignition key 1 is closed; the starter relay 2 is closed, the battery 3 supplies power to the starter motor 4, and the starter motor 4 drives the drive gear to generate Mechanical movement, while the transmission mechanism drives the flywheel to rotate and starts the engine. After the engine is started, when the ignition key returns to the ON gear from the START gear, the mechanical structure of the starter motor can be separated from the flywheel ring gear automatically, without disturbing the normal operation of the engine. ...

AI Technical Summary

Problems solved by technology

[0004] First of all, when the car engine is started, the car engine can be ignited and started only when the car gearbox is in neutral (N gear) or park (P gear). The car is moving; once there is an obstacle ahead, it will damage the car or endanger personal safety

However, the current engine start control method cannot judge the gear position of the automobile gearbox when the car is ignited and started, and cannot guarantee the safety of the vehicle and the user when the engine is started.

[0005] Secondly, in order to protect the starter motor, the starting time of the engine should not be too long each time. If the car starter motor runs continuously with load for more than 5-8 seconds; Continue to work, the flywheel gear will drive the starter motor to drive the gear to rotate at a high speed, accelerating and damaging the one-way clutch of the starter motor

However, the current engine starting control method cannot judge the continuous power-on time of the starter motor, which may easily cause damage to the starter motor and affect the service life of the starter motor and battery

[0006] Again, if the ignition key is turned on by mistake after the engine is started, the starter motor drive gear will collide with the high-speed rotating flywheel and damage the starter motor, so it cannot be started again when the engine is started.

However, the current engine starting control method cannot prevent the starter motor from being started again, which may easily cause damage to the starter motor

[0007] Finally, if the engine fails to start for the first time, the time interval between engine restarts must be controlled within a reasonable range. If the engine start time interval is too short, the battery will be continuously and deeply discharged in a short period of time, which will affect the service life of the battery.

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