Auxiliary air volume control device for internal-combustion engine
Patent
·
OSTI ID:6896792
An auxiliary air control device for a liquid cooled internal combustion engine is described comprising a control valve disposed in an air bypass that communicates between the upstream and downstream sides of a throttle valve inserted in an inspired air passage of the internal-combustion engine. The control valve includes a solenoid valve whose degree of opening is responsive to the magnitude of an electric current which flows through a solenoid coil associated with the valve thereby to vary the amount of air flowing through the bypass substantially in proportion to the value of a command that is supplied to the control valve, arithmetic means for calculating the value of the command that is supplied to the control valve so as to cause the number of revolutions of the engine to agree with a target number if idling revolutions, trouble detecting means for detecting a malfunction of the arithmetic means, means for generating a predetermined fixed command value, switch means responsive to the detection of a malfunction by the trouble detecting means for supplying the predetermined fixed command value to the control valve in place of the command valve from the arithmetic means, and means for circulating the engine cooling liquid around the periphery of the solenoid valve to vary the resistance of the solenoid coil with changes in the temperature of the engine cooling liquid. The magnitude of the electric current flowing through the solenoid coil, and accordingly the degree of opening of the control valve when there is a malfunction of the arithmetic means, is a joint predetermined desired function of the fixed command value and the temperature of the engine cooling liquid.
- Assignee:
- Honda Giken Kogyo Kabushiki Kaisha, Tokyo
- Patent Number(s):
- US 4760824
- OSTI ID:
- 6896792
- Country of Publication:
- United States
- Language:
- English
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