Ignition detection circuit

Details Ignition detection circuit Ignition detection circuit

1996-09-25

1998-03-03

Dolinar, Andrew M.

Internal-combustion engines

High tension ignition system

Current or voltage sensing in coil primary

324380, 324388, F02P 1712

Patent

active

057223785

ABSTRACT:
An ignition circuit IG converts a battery voltage into a high spark plug discharge voltage. A resistor R1 inserted into the power supply path L detects the current flowing through the ignition circuit by converting the current into a voltage, and a level shift circuit LS shifts the potential level at both terminals of the detection resistor. A level deviation detection circuit regulates the level of a deviation voltage developed across the detection resistor, which is caused when an electric current flows from the battery to the ignition circuit, and outputs the deviation voltage. A reference voltage generation portion sets a reference voltage to be compared with the deviation voltage by a comparator COM. A clamping circuit CL suppresses variations in the power supply voltage corresponding to the level deviation detection circuit and the comparator, and protects the level deviation detection circuit. Thus, the influence of a surge voltage exerted on the comparator embodied in a monolithic IC is greatly reduced. Moreover, the accuracy in detecting a load current at the time of engine ignition is enhanced.

REFERENCES:
patent: 4333054 (1982-06-01), Walker
patent: 5146907 (1992-09-01), Sawazaki et al.
patent: 5197449 (1993-03-01), Okamoto et al.
patent: 5299543 (1994-04-01), Taruya et al.
patent: 5373826 (1994-12-01), Taruya et al.
Patent Abstracts of Japan, for JP 7-259712, Sawazaki et al, Oct. 9, 1995.

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