System for controlling the ignition timing of a combustion engin

Internal-combustion engines – Combustion chamber means combined with air-fuel mixture...

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F02P 504

Patent

active

044885288

ABSTRACT:
A system for controlling the ignition timing of an engine has a probe provided on the wall of a cylinder of the engine opposite the piston in the cylinder. A capacitance-to-voltage converting circuit is provided for measuring the crank angle of the engine by the capacitance between the probe and the top of the piston and for producing an output dependent on the crank angle, and a second circuit is provided for measuring the velocity of flame propagation in the cylinder by detecting the ionization current flowing between the probe and the cylinder and for producing an output when the velocity is very high. An ignition timing control circuit is responsive to output of the converting circuit and second circuit for retarding the ignition timing so as to prevent the knocking of the engine.

REFERENCES:
patent: 3903856 (1975-09-01), McDougal et al.
patent: 4304203 (1981-12-01), Garcea et al.
patent: 4417556 (1983-11-01), Latsch
patent: 4444172 (1984-04-01), Sellmaier et al.

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