Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1976-11-09
1978-04-18
Burns, Wendell E.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
123 32EE, 123119D, 123124R, F01N 315, F02B 7510, F02M 3700
Patent
active
040845630
ABSTRACT:
An additional air control device for an internal combustion engine wherein an additional air supply to the engine is controlled by controlling the operation of a drive motor coupled to a control valve mounted in a bypass passage. The driving direction of the drive motor to open or close the control valve is controlled by a gas sensing signal representing the content of the exhaust gas and generated by a gas sensor, and the duty ratio between the drive time period .tau.a and the rest time period .tau.b of the drive motor is controlled depending on an intake air flow signal representing a delay time factor from an intake air flow meter. In deceleration operation of the engine, the duty ratio .tau.a/.tau.b is increased independently of the intake air flow signal by a deceleration signal produced by a deceleration detecting switch. The drive motor is thus controlled to drive in a skip movement fashion and to stop alternately with the duty ratio of .tau.a/.tau.b in an opening or closing direction of the control valve, thereby the air-fuel ratio is maintained at a constant value and the exhaust gas emission is controlled.
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patent: 3815561 (1974-06-01), Seitz
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patent: 3960118 (1976-06-01), Konomi et al.
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patent: 4029061 (1977-06-01), Asano
patent: 4031866 (1977-06-01), Asano
Hattori Tadashi
Nakase Takamichi
Yamaguchi Hiroaki
Burns Wendell E.
Nippon Soken Inc.
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