Method for controlling by-pass air flow on deceleration of inter

Details Method for controlling by-pass air flow on deceleration of inter Method for controlling by-pass air flow on deceleration of inter

1987-07-10

1988-12-06

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Responsive to deceleration mode

123585, F02M 2306

Patent

active

047889543

ABSTRACT:
Described herein is a method for controlling the bypass air flow of internal combustion engine, which prevents the air-fuel ratio from becoming over rich temporarily in the initial stage of deceleration of the engine by driving a control valve to open a throttle by-pass passage on deceleration of the engine to supply auxiliary air thereto and which includes: detecting the open angle of the throttle valve; setting a valve opening rate according to the throttle open angle; setting an upper limit on the valve opening rate when it is greater than an upper limit value determined in relation with the engine speed; driving the control valve according to the valve opening rate; and on deceleration of the engine, gradually reducing a valve opening rate set in an operation prior to the deceleration.

REFERENCES:
patent: 4430973 (1984-02-01), Miyagi
patent: 4453514 (1984-06-01), Martinsons et al.
patent: 4492211 (1985-01-01), Shimomura et al.
patent: 4700679 (1987-10-01), Otobe et al.

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