Vorstelleinrichtung fuer Zuendverstellung bei einem Kraftfahrzeug

摘要

A vacuum advance control system of ignition timing for reducing the hydrocarbon content of engine exhaust gases emitted especially during deceleration of a motor vehicle. The system is provided an advance control assembly composed of a vacuum operated sensing valve and a flow modulating needle valve cooperating with each other. The assembly operates in association with a conventional intake manifold, carburetor, distributor and distributor advance vacuum actuator in order to control continuously the level of the vacuum to be introduced into the actuator in response to the intake manifold vacuum which increases abruptly for the decelerating condition.