Ignition monitoring circuit for an ignition system of an interna

Details Ignition monitoring circuit for an ignition system of an interna Ignition monitoring circuit for an ignition system of an interna

1989-03-01

1990-01-09

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

324380, 324392, 324160, 324166, F02P 1700, G01P 342

Patent

active

048930857

ABSTRACT:
An ignition monitoring circuit for an ignition system of an internal combustion engine of an automobile, which comprises, in addition to a pulse height and a pulse width shaper circuit, a circuit for eliminating an initial erroneous pulse which is generated from the pulse width shaper circuit upon making of the key switch. The pulse height shaper circuit shapes impulses corresponding to an ignition voltage into pulses of predetermined height; the pulse width shaper circuit shapes the output pulses of the pulse height shaper circuit into pulses of predetermined width. The eliminating circuit comprises: a serial circuit of a resistor, a diode, and a capacitor, coupled across the battery; and a transistor, having its base coupled to the output terminal of the pulse height shaper circuit through an inverter, which is coupled in parallel with the serial connection of the diode and the capacitor. The transistor is turned off to charge the capacitor and supply a voltage to the output terminal of the pulse width shaper circuit, in response to an output pulse of the pulse height shaper circuit. An output pulse of the pulse width shaper circuit not corresponding to any output pulse of the pulse height shaper circuit is eliminated by the capacitor of the eliminating circuit.

REFERENCES:
patent: 3706035 (1972-12-01), Hoehn
patent: 3970872 (1976-07-01), Kuhn et al.
patent: 4000456 (1976-12-01), Johnston et al.
patent: 4575677 (1986-03-01), Dennis
patent: 4680721 (1987-07-01), Pluddemann

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