Abstract: Deceleration control apparatus for a vehicle engine minimizes increase in exhaust pollutants during sudden deceleration while at the same time maintaining effective braking action of the engine to reduce the speed of the vehicle. In addition to a dash pot mechanism subjected to vacuum pressures both upstream and downstream from the engine throttle valve for regulating closing movement of the throttle valve, an air passage communicates with the engine intake passage downstream from the throttle valve. A control valve is operatively interposed in the air passage to admit atmospheric air into the engine intake passage upon sudden deceleration in engine speed. The control valve closes slowly during continued deceleration and closes off the air supply when deceleration ceases.

Abstract: An ignition timing control system for internal combustion engines during warm-up utilizes opposed chambers separated by a flexible diaphragm to control movement of a rod to advance or retard the ignition timing. Temperature responsive electric switches energize electromagnetic valves to control vacuum pressures in said chambers, so that as a cold engine warms up, the ignition timing changes from advance to retard in a series of steps.

Abstract: A system is disclosed for controlling the ignition timing for an internal combustion engine on a vehicle. The control effected is designed to increase mileage during low exhaust emission conditions and to better control exhaust emissions under conditions tending to increase such emissions. A double acting vacuum control mechanism is indirectly responsive to engine vacuum through a control valve arrangement which selects either increased advancement or increased retardation with increased engine vacuum as a function of the operating conditions of the engine. The operating conditions of the engine which determine the selection of the control valve position are vehicle speed and the degree of steady state operation referred to as cruising conditions.

Abstract: Timing control mechanism for an internal combustion engine employs a vacuum chamber connected to a solenoid valve operated by a thermal switch responsive to engine temperature. The solenoid valve connects the vacuum chamber to one of two vacuum outlets connected to the engine intake passage. The first of the outlets is positioned adjacent and upstream from the throttle valve and the second of the outlets is positioned downstream from the throttle valve. The passage from the first outlet to the solenoid valve contains orifice means to restrict flow and also contains a check valve in parallel with the orifice means to permit flow toward the solenoid valve. The passage from the second vacuum outlet contains a check valve preventing flow toward the solenoid valve.

Abstract: 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.