Air-fuel ratio control system for engine
AssigneesMazda Motor Corporation, Mitsubishi Denki Kabushiki Kaisha
InventorsFutoshi Nishioka, Tetsushi Hosokai, Shinichi Mogaki
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Abstract
An air-fuel control system for a lean burn engine which carries out lean burning under specific engine operating conditions causes the engine to burn at an stoichiometric air-fuel ratio regardless of engine operating conditions upon an occurrence of malfunctions of a stratifying device and/or a fuel injection timing control device, so as thereby to enable the engine always to operate in good conditions.
Claims25
An air-fuel ratio control system for a multi-cylinder, internal combustion engine equipped with stratifying means for producing a stratified fuel mixture in a combustion chamber of each of cylinders and air-fuel ratio control means for varying an air-fuel ratio toward the lean side during operation of the stratifying means, said air fuel control system comprising:
- operation control means for controlling said operation of said stratifying means;
- malfunction discernment means for discerning an occurrence of a malfunction of at least one of said operation control means and said stratifying means;
- and
- control restraint means for restraining said air-fuel ratio control means from varying an air-fuel ratio toward the lean side.
An air-fuel ratio control system for a multi-cylinder, internal combustion engine equipped with air-fuel ratio control means for varying an air-fuel ratio toward the lean side and timing control means for adjusting a desired timing at which fuel is delivered into each said cylinder in an intake stroke during operation of said air-fuel ratio control means, said air-fuel control system comprising:
- a sensor for controlling adjustment operation of said timing control means;
- malfunction discernment means for discerning an occurrence of a malfunction of said sensor;
- and
- control restraint means for restraining said air-fuel ratio control means from varying an air-fuel ratio toward the lean side.
Dependencies are inferred from the claim text.