Air-flow control device for engine

Internal-combustion engines – Engine speed regulator – Having plural throttle valve structure

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Details

123389, 12317918, F02D 902

Patent

active

055423884

ABSTRACT:
An air-flow control device, for an engine having an intake passage and a fuel injector arranged in the intake passage for injecting fuel into the intake passage, includes an air-flow control valve, and a driving apparatus for driving the air-flow control valve. The air-flow control valve is arranged in the intake passage upstream of the fuel injector. The apparatus includes a first vacuum chamber into which the atmospheric pressure or a negative pressure produced in the intake passage downstream of the air-flow control valve is selectively introduced via a first vacuum control valve, and a second vacuum chamber into which the atmospheric pressure or a negative pressure produced in the intake passage downstream of the air-flow control valve is selectively introduced via a second vacuum control valve. The apparatus drives the air-flow control valve so that the degree of opening of the air-flow control valve becomes larger as the negative pressure in the first and the second vacuum chamber becomes larger. During an engine starting operation, the air-flow control valve is closed by introducing the atmospheric pressure into both of the first and the second vacuum chambers. After the engine starting operation is finished, the air-flow control valve is opened and the degree of opening of the air-flow control valve is controlled by controlling the negative pressure in the first and the second vacuum chambers.

REFERENCES:
patent: 4289100 (1981-09-01), Kinugawa et al.
patent: 4693222 (1987-09-01), Itou et al.

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