Electronic circuit apparatus of detecao speed of engine and control apparatus to minimize the delivery of fuel not burned an internal combustion engine of a vehicle,

摘要

The invention is disclosed herein in apparatus for minimizing the emission of unburned and partially burned fuel from a vehicle internal combustion engine having a carburetor and intake manifold including means for providing a vacuum source for engine control function, an ignition system including an ignition coil, an electrical energy source connected to the ignition coil, and an exhaust gas manifold. An exhaust gas recirculation valve is utilized for feeding exhaust gases back from an exhaust system to an intake manifold. A solenoid valve is utilized for selectively connecting a vacuum source to operate the exhaust gas recirculation valve. An electronic engine speed sensing means is utilized to control the solenoid valve. Although the electronic engine speed sensing circuit disclosed herein has particular applicability as a control means with the vehicle system described, it should be noted that the novel electronic engine speed sensing circuit has utility elsewhere.