Throttle-valve control apparatus for spark-ignition two-cycle en

Details Throttle-valve control apparatus for spark-ignition two-cycle en Throttle-valve control apparatus for spark-ignition two-cycle en

1994-11-25

1996-03-05

Wolfe, Willis R.

Internal-combustion engines

Engine speed regulator

Idle speed control

12333923, 123400, F02D 910, F02D 4108

Patent

active

054958369

ABSTRACT:
A throttle-valve control apparatus is provided for allowing switching from an ordinary-combustion state to an AR-combustion state or vice versa to take place with ease in an AR-combustible spark-ignition two-cycle engine wherein, at least during a light-load operation, a compression-start pressure is properly controlled in order to let fresh air in a combustion chamber self-ignite so as to undergo active thermal atmosphere combustion. A throttle drum is linked to a throttle grip through a wire. The throttle drum is also linked to a throttle valve through a linking mechanism. An arm forms a single body with the throttle drum. An adjustment screw is fixed at the end of the arm. A cam is supported at such a location that the cam can be brought into contact with the adjustment screw. A pulley forms a single body with the cam. A cable which is wound around the pulley is linked to a throttle-valve servo motor. In ordinary combustion ignited by spark ignition, the cam is erected, preventing the throttle opening rate .theta..sub.th of the throttle valve from decreasing to a value smaller than, typically, 17%.

REFERENCES:
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patent: 4180029 (1979-12-01), Onishi
patent: 4200596 (1980-04-01), Iiyama et al.
patent: 4213431 (1980-07-01), Onishi
patent: 4445468 (1984-05-01), Onishi et al.
patent: 4566415 (1986-01-01), Iwai et al.
patent: 4932371 (1990-06-01), Albertson et al.
patent: 4940031 (1990-07-01), Mann
patent: 5273016 (1993-12-01), Gillespie et al.
Patent Abstracts Of Japan, vol. 15, No. 416 (M-1172) Oct. 23, 1991.

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