Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1976-11-09
1978-03-07
Burns, Wendell E.
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
123119D, 123119EC, 123119VC, 123124B, F02B 7510
Patent
active
040772071
ABSTRACT:
An additional air control device for maintaining constant air-fuel ratio in an internal combustion engine wherein an intake air which is supplied additionally through a bypass passage to the engine is controlled by controlling the movement of a drive motor coupled to a control valve mounted in the bypass passage. A gas sensor for sensing the oxygen content of the exhaust gas and an intake air flow meter for sensing the rate of intake air flow to the engine are provided. In accordance with a signal from the gas sensor and an intake air flow signal representing a delay time factor from the intake air flow sensor, the drive motor is controlled to stop or drive alternately in a skip movement fashion in either an opening or closing direction of the control valve, and a rest period of the drive motor is determined to be inversely proportional to the intake air flow rate and a driving period which is subsequent to the rest period is set to a fixed time period, thereby an air-fuel ratio is maintained at a constant value and an exhaust gas emission is controlled.
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Hattori Tadashi
Nakase Takamichi
Yamaguchi Hiroaki
Burns Wendell E.
Nippon Soken Inc.
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