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Engine startup device

A technology of engine starting and engine, which is applied in the direction of engine starting, engine components, engine motor starting, etc., and can solve problems such as instantaneous interruption, battery output voltage drop, and electrical equipment interruption

Inactive Publication Date: 2014-10-22
HITACHI AUTOMOTIVE SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to this inrush current, the output voltage of the battery will drop, and electrical equipment such as audio and navigation systems mounted in the vehicle will be interrupted momentarily.
[0004] In particular, in vehicles equipped with automatic engine stop / start systems (so-called idle stop systems) that have been widely used in recent years due to increased awareness of environmental issues and restrictions on automobile exhaust, each time the engine stops When restarting, there may be a momentary interruption of electrical equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 of the present invention is an example of an engine starter that operates a short-circuit-open state switch connected in parallel to a current suppressor based on a voltage between the current suppressor and a starter motor.

[0034] figure 1 It is an overall schematic configuration diagram of the engine starting device according to Embodiment 1 of the present invention.

[0035] Such as figure 1 As shown, the engine starting device of Embodiment 1 has: a starter motor 100 with one end grounded; a starting resistor (current suppressor) 102 connected at one end to the other end of the starter motor 100; a short circuit switch (short circuit) connected in parallel with the starting resistor 102 open circuit state switch) 104; and a voltage determiner 106 for operating short circuit and open circuit of the short circuit switch 104 based on the voltage (potential) of a point between the starting resistor 102 and the starter motor 100.

[0036] An engine start...

Embodiment 2

[0054] Next, Embodiment 2 of the present invention will be described.

[0055] Embodiment 2 of the present invention is an example of an engine starting device based on the difference between the potential of a point between the current suppressing resistor 102 and the starter motor 100 and the potential of the ground point (GND) of the starter motor 100 (hereinafter (referred to as the starting motor voltage) to operate the short-circuit open switch 200 connected in parallel with the current suppression resistor 102 . image 3 is a schematic configuration diagram of an engine starting device in Embodiment 2 of the present invention.

[0056] Such as image 3 As shown, the engine starting device of Embodiment 2 has: a starter motor 100 with one end grounded; a starting resistor 102 connected at one end to the other end of the starter motor 100; a solenoid switch 200 connected in parallel with the starting resistor 102; A freewheeling diode (for a solenoid switch) 202 connect...

Embodiment 3

[0078] Next, Embodiment 3 of the present invention will be described.

[0079] Embodiment 3 of the present invention is an example of an engine starting device using a semiconductor switch as a short-circuit open switch connected in parallel to the current suppressing resistor 102 . Figure 4 is a schematic configuration diagram of an engine starting device according to Embodiment 3 of the present invention.

[0080] Such as Figure 4 As shown, the engine starting device of embodiment 3 has: a starter motor 100 that is grounded at one end; a starting resistor 102 that is connected to the other end of the starter motor 100 at one end; a p-type MOSFET 300 that is connected in parallel with the starting resistor 102; A freewheeling diode (for the starter motor) 304 connected to the positive side terminal of the positive side and whose anode is grounded; a voltage dividing circuit 204 connected in parallel to the starter motor 100 ; and an n-type MOSFET 206 .

[0081] The voltag...

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Abstract

The objective of the present invention is to implement an engine startup device with which a temporary interruption of electrical devices upon engine startup can be suppressed without requiring a battery status detection circuit to be provided in the vehicle. When the engine startup operation begins, a start switch (108) is closed, and current flows from a battery (110) to the engine startup device. At this time, a short-circuit switch (104) is open, so current flows to a starter motor (100) through a starting resistor (102). When the voltage between the starting resistor (102) and the starter motor (100) meets a predetermined criterion, a voltage determination device (106) places the short-circuit switch (104) in the short-circuited state. At this time the starter motor (100) is rotating and is generating back electromotive force, so the current flowing to the starter motor (100) is suppressed and the voltage drop in the battery (110) is sufficiently small, so a temporary interruption of the operation of the electrical devices installed in the vehicle does not occur. When a vehicle control device determines that the engine has started, the start switch (108) is opened and the supply of electricity to the engine startup device is stopped.

Description

technical field [0001] The present invention relates to engine starting devices. Background technique [0002] Conventionally, in a vehicle engine such as a vehicle equipped with a gasoline engine, a starter motor is provided as an engine starter for rotating the crankshaft of the engine at a predetermined speed or higher when starting the engine. [0003] Immediately after starting the engine by the starter motor, the starter motor does not rotate, and therefore no counter electromotive force is generated, so a large current called an inrush current flows through the starter motor. The output voltage of the battery drops due to the inrush current, and electrical equipment such as audio and navigation systems installed in the vehicle is momentarily interrupted. [0004] In particular, in vehicles equipped with automatic engine stop / start systems (so-called idle stop systems) that have been widely used in recent years due to increased awareness of environmental issues and re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02N11/08
CPCF02N2250/02F02N2200/043F02N11/08F02N11/087
Inventor 谷贝将通
Owner HITACHI AUTOMOTIVE SYST LTD
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