Kenyon & Kenyon
Air-fuel ratio control device for internal combustion engine
 An air-fuel ratio control device for an internal combustion engine of a vehicle is disclosed. The device controls the air-fuel ratio with a target value which is larger than the stoichiometric air-fuel ratio, as a control center, in an idle condition. The target value is changed to become small when an amount of intake air in an idle condition is larger than a predetermined value. 
Toyota Jidosha Kabushiki Kaisha
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Takayuki Toshihiro Hiroshi Yoshiaki
Otsuka Fukumasu Kanai Atsumi