Engine idling speed control systems

Details Engine idling speed control systems Engine idling speed control systems

1981-10-19

1984-05-01

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Idle speed control

123585, F02M 306

Patent

active

044454759

ABSTRACT:
In a reciprocating internal combustion engine of the spark ignition type the idling rotational speed of the engine is controlled by a system in which a secondary air flow through a passage bypassing the main air intake throttle valve (1) of the engine is controlled by a valve having a conical valve member (3) co-operating with a seat (2) to form a Laval nozzle at all open positions of the valve. The valve member (3) moves in response to the pressure difference across a diaphragm (9) separating two chambers (6) and (7). The chamber (7) communicates through a throttling element (8) with the pressure P.sub.s downstream of the throttle valve (1) and contains a spring (11) biassing the diaphragm (9) to open the valve (2, 3). The chamber (6) communicates through a throttling element (12) with the pressure P.sub.a upstream of the throttle valve (1) and also communicates through a more restricted throttling element (13) with the downstream pressure P.sub.s . The communication of the chamber (6) to the pressure P.sub.a is also controlled by an electronic control valve (14) which operates and regulates a mark space ratio communicating the pressures P.sub.a and P.sub.s to the chamber (6) alternately and in response to the difference between the actual engine idling speed and a set-point idling speed.

REFERENCES:
patent: 3156226 (1964-11-01), Linn
patent: 3661131 (1972-05-01), Croft
patent: 4237838 (1980-12-01), Kinugawa et al.
patent: 4300501 (1981-11-01), Suzuki
patent: 4312311 (1982-01-01), Iwata

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