System for controlling flow of intake air during start-up...

Details System for controlling flow of intake air during start-up... System for controlling flow of intake air during start-up...

2005-06-07

2005-06-07

Denion, Thomas (Department: 3748)

Internal-combustion engines

Charge forming device

Auxiliary air or oxygen added to combustible mixture

C123S339150

Reexamination Certificate

active

06901919

ABSTRACT:
A system for controlling a flow of intake air in a secondary intake air passage during a start-up period of an internal combustion engine. A main intake air passage extends to an intake port of the engine. A throttle valve is located in the main intake air passage. The secondary intake air passage connects to the main intake air passage at a position downstream of the throttle valve. The system includes a heater to heat a thermo-sensitive valve provided in the secondary intake air passage. A valve opening degree of the thermo-sensitive valve changes as the valve is heated by the heater. The system determines a duty ratio that controls a drive current supplied to the heater. The system supplies the drive current to the heater by applying a voltage pulse at a predetermined period. The voltage pulse has a pulse width determined by the duty ratio.

REFERENCES:
patent: 4231337 (1980-11-01), Kuwahara et al.
patent: 4393012 (1983-07-01), Kato et al.
patent: 4567476 (1986-01-01), Lang
patent: 4787351 (1988-11-01), Sakamoto et al.
patent: 5065718 (1991-11-01), Suzuki et al.
patent: 6315693 (2001-11-01), Tayama
patent: 0 900 683 (1999-03-01), None
patent: 1 041 266 (2000-10-01), None
patent: 02081940 (1990-03-01), None
Patent Abstracts of Japan, vol. 009, No. 103 (M-377), JP 59 226258, Dec. 1984.

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