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Title:
APPARATUS FOR FEEDING CURRENT TO GLOW PLUG
Document Type and Number:
Japanese Patent JPS58135374
Kind Code:
A
Abstract:

PURPOSE: To enable to control the period of after-glow. by stopping current supply to glow plugs in response to a frequency component of the pulsation voltage developed at an unrectified terminal or neutral point terminal of a three-phase AC generator for driving an engine.

CONSTITUTION: Before starting an engine, only a switch S1 is closed for heating glow plugs 4aW4d repidly by the voltage of a bettery 6. After starting of the engine, on the other hand, the switch S1 is opened for producing after-glow. In this state, the AC voltage developed at an unrectified terminal A of an alternator 3 by a comparator 21 is formed into a pulse train having a fixed width by a monostable multivibrator 22 and then into a voltage proportional to the engine speed by integrating the pulse train by a low-pass filter consisting of R1 and C1. By judging the voltage proportional to the engine speed at a comparator 23, a transistor TR1 is switched from ON to OFF. That is, in idling operation of the engine, a low voltage is produced and the output of the comparator 23 becomes high and energizes the transistor TR1, so that the contact of a relay 5 is closed and the voltage at the unrectified terminal A is applied. On the other hand, when the engine operation is shifted from the idling operation to other mode, after-glow of the glow plugs is stopped by opening the contact of the relay 5.


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Inventors:
KIKUCHI TETSUO
KUWAKADO SATOSHI
HASHIKAWA ATSUSHI
KATOU KAZUKI
KUMOI TOMIO
Application Number:
JP1716682A
Publication Date:
August 11, 1983
Filing Date:
February 04, 1982
Export Citation:
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Assignee:
NIPPON SOKEN
NIPPON DENSO CO
International Classes:
F02P19/02; (IPC1-7): F23Q7/00



 
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