Light emission delay circuit

Details Light emission delay circuit Light emission delay circuit

1982-09-30

1984-06-12

Karlsen, Ernest F.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

Ignition timing

73119A, G01M 1500

Patent

active

044544758

ABSTRACT:
A light emission delay circuit adjusts a light emission time of a timing light into conformity with a time when a piston in an engine cylinder reaches a top dead center in detecting an ignition time for the engine cylinder. The light emission delay circuit comprises first means responsive to a first signal indicative of the ignition timing for the engine cylinder and a second signal having a leading edge substantially agreeing with the ignition time of the engine cylinder for producing a third signal having a leading edge with a leading edge of the second signal. The third signal is produced substantially two periods beyond the ignition time of the first signal, and also has a width of time equal to the period of the second signal. Second means for delaying the leading edge of the third signal, third means for generating a fourth signal having a leading edge aligned with the leading edge of the third signal as delayed by the second means and a trailing edge aligned with a trailing edge of the third signal as supplied from the first means, and fourth means for counting a clock signal upwardly during the interval of the fourth signal and then counting the clock signal downwardly during an interval equal to the interval of the fourth signal to produce an output signal for enabling the timing light to emit light are also provided.

REFERENCES:
patent: 4092585 (1978-05-01), Bovenlander
patent: 4378695 (1983-04-01), Oshizawa

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