Controlling device of air-fuel ratio

Abstract

Abstract PURPOSE: To prevent troubles due to air-fuel ratio in an idle time during deceleration or after the end of deceleration by a method wherein such a means is provided that at the start of deceleration outputs of an integrator are changed into values corresponding to openings slightly larger than the mean opening of a controlling valve in an idle time. CONSTITUTION: An electronic controlling part 8 including an adder 30 and the like is provided by which at the start of deceleration outputs of the integrator 17 are changed into values corresponding to openings a little larger than the mean opening of the controlling valve 9 in an ield time. When a throttle valve close at t 1 and deceleration begins, a negative pressure exceeding an intended value is taken out from a throttle port, the output of a negative pressure switch 10 is given by "1", a monostable multivibrator 37 generates pulses of an intended width T from t 1 . The output "1" is transmitted to a switch 22 and keeps a closed state until time t 2 when an intended time T passes from time t 1 . As a result a capacitor 19 is discharged or charged and the voltage between both ends is given by V 0 . Accordingly, the output of an adder 30 takes a value V a corresponding to an output V 0 of the integrator 17 and the opening of the controlling value 9 keeps an opening a little larger than the mean opening in an idle time. COPYRIGHT: (C)1982,JPO&Japio

Inventors

• 👤 Shinichi Sato
• 👤 Mitsuharu Taura

Bibliographic Details