Intake air control system for an automotive engine
This patent describes a system for controlling the intake air in an automotive engine having an intake passage, a throttle valve in the intake passage, and a bypass provided for bypassing the throttle valve, comprising: a control valve provided in the bypass to control the amount of bypassing air; actuating means for operating the control valve; means for detecting the temperature of a coolant of the engine and for producing a first temperature signal when the temperature is lower than a predetermined value and for producing a second temperature signal when the temperature of the coolant is higher than the predetermined value, respectively; means for detecting the position of the throttle valve and for producing a throttle position signal when the throttle valve is closed to an idle opening position; control means responsive to the first temperature signal and to the throttle position signal for actuating the actuating means so as to hold the control valve in an open state for a predetermined period dependent on the temperature, and thereafter to close the control valve, and the control means responsive to the second temperature signal and to the throttle position signal for gradually closing the control valve.
- Assignee:
- Fuji Jukogyo Kabushiki Kaisha, Tokyo
- Patent Number(s):
- US 4672936
- OSTI ID:
- 6299263
- Country of Publication:
- United States
- Language:
- English
Similar Records
Intake air quantity control method for internal combustion engines
Air intake device of an internal combustion engine