Lowe, King, Price & Markva
Air-fuel ratio control adjusting system in an internal combustion engine
 Secondary air is fed into the engine exhaust gas passageway at a position upstream of an oxygen sensor to cause the electric air-fuel ratio control device and the air-fuel mixture generator to provide an air-fuel mixture having an air-fuel ratio lower than a set desired air-fuel ratio during idle and slow speed running of the engine. 
Nissan Motor Company, Limited
F F F Y F F
F01N F02D F01N Y02A F01N F02D
inventional inventional inventional additional inventional inventional
Hidehiro Masaaki
Minami Saito