Internal-combustion engines – Engine speed regulator – Engine speed reduction by fuel cutoff
Patent
1984-06-15
1985-09-17
Cuchlinski, Jr., William A.
Internal-combustion engines
Engine speed regulator
Engine speed reduction by fuel cutoff
123339, 123399, F02M 114
Patent
active
045413789
ABSTRACT:
A throttle control device for an internal combustion engine comprising an acceleration sensor for generating an output signal corresponding to the amount of depression of an accelerator pedal, a vacuum sensor for varying an output in response to change in negative pressure in an air intake passage between in a fully closed position of a throttle valve upon release of the accelerator pedal and in an open position of the throttle valve upon depression of the accelerator pedal, a throttle valve driving motor for driving the throttle valve against a biasing force of a back spring normally biasing the throttle valve in its fully closing direction, and an electric control circuit for receiving output signals from the acceleration sensor and the vacuum sensor and the vacuum sensor to control the throttle valve driving motor in response to the output signal from the acceleration sensor, and acting to cut off current to the throttle valve driving motor when the output signal from the vacuum sensor upon release of the accelerator pedal is an output corresponding to an open position of the throttle valve. With this arrangement, the throttle valve may be easily and quickly returned to its fully closed position, i.e., to engine idling condition with the aid of biasing force of the back spring by cutting off current to the throttle valve driving motor, in the case that negative pressure in the air intake passage under such a condition that the accelerator pedal is undepressed does not reach a predetermined value of negative pressure corresponding to the fully closed position of the throttle valve, and the throttle control condition is decided as being abnormal.
REFERENCES:
patent: 4398514 (1983-08-01), Nakamura
patent: 4474155 (1984-10-01), Sagnes
Aisan Kogyo Kabushiki Kaisha
Cuchlinski Jr. William A.
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