Schwartz, Jeffery, Schwaab, Mack, Blumenthal & Koch
Air/fuel ratio control system for internal combustion engine having rotary valve and step motor
 A system for feedback control of the air/fuel mixing ratio in an internal combustion engine equipped with a carburetor. The control system has an air/fuel ratio detector of a gas sensor type which provides a feedback signal to a control circuit and a rotary valve which is operated by a stepping motor responsive to a control pulse signal produced by the control circuit to regulate the fuel feed rate so as to nullify a deviation of the detected actual air/fuel ratio from a preset air/fuel ratio. The control system may include two auxiliary air-admitting passages respectively connected to a main fuel passage and a slow fuel passage in the carburetor, and in this case the single rotary valve is designed and arranged so as to simultaneously control the admission of air into both of the two auxiliary air-admitting passages. 
Nissan Motor Company, Limited
F F F
F02M F02D F02M
inventional inventional inventional
Masaaki
Saito