Engine starting device

Abstract

The invention provides an engine starting device which prevents intermittent disconnection with a simple circuit structure without damaging the function of the starting device even in the case of action failure of a short-circuiting switch. The engine starting device includes: a starter switch 5 which is serially connected between a power supply 3 and a starting engine 2; a resistor 6 which is serially connected with a starting engine switch; the short-circuiting switch 7 which makes the resistor be short out; and a timing circuit 8 which controls the on-off of the short-circuiting switch, electrifies the starting engine by the power supply via the starter switch and the resistor through shutting off the starter switch 5 to shut off the short-circuiting switch 7 after a delay period afterthe starter switch is shut off, such that the short-circuiting switch 7 is shut off and the resistor is short out; the contact of the short-circuiting switch 7 is a normally closed contact; before the contact of the starter switch 5 is closed, the contact of the short-circuiting switch 7 is disconnected; and after the contact of the starter switch is closed, the contact of the short-circuiting switch 7 is closed.

Description

technical field [0001] The invention relates to an engine starting device which uses a starter motor to start an engine. Background technique [0002] In the case of starting the engine, the coil of the starter switch is energized to close the fixed contact of the starter switch, so that the vehicle power supply is used to supply power to the starter motor, so that the starter motor generates a rotational torque, and through the meshing The pinion and ring gear transmit the rotational force of the starter motor to the engine crankshaft to start the engine. At this time, when the starter switch is closed, the starter motor is still in a static state and does not generate back electromotive force voltage. Therefore, the extremely small internal resistance of the starter will cause an inrush current of hundreds to hundreds of amperes to flow. At this time, a voltage drop occurs in the vehicle power supply due to an internal inherent resistance in which the terminal voltage dro...

AI Technical Summary

Problems solved by technology

[0003] Therefore, when the engine is started, there will be the following problem: that is, the voltage drop of the vehicle power supply caused by the current when the starter motor is started will cause damage to the vehicle's other electrical equipment, such as stereos, navigation systems, air conditioners, etc. momentary interruption

This momentary interruption does not become a problem when the engine is started normally, but in a vehicle equipped with an idle stop function, etc., a momentary interruption may occur when the engine is restarted after the idling stop, and may cause serious damage to the driver and passengers. come discomfort

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