IGNITION TIMING CONTROL SYSTEM OF ENGINE IN VEHICLES OF AUTO-MATIC TRANSMISSION TYPE

摘要

Ignition timing control apparatus for an internal combustion engine driving a vehicle through an automatic transmission includes a vacuum actuator connected to turn a point base about the axis of the rotary cam which operates the breaker points. The vacuum actuator is connected by a conduit to an intake passage in the engine downstream from the throttle valve. An electromagnetic selector valve is placed in the conduit and acts to connect the vacuum actuator either to the engine intake passage or to atmosphere. A temperature responsive member operates an electric switch to control the selector valve. A check valve and a restricted orifice are mounted in parallel in said conduit between the selector valve and the vacuum actuator.