Fuel control system for automotive power plant

Internal-combustion engines – Charge forming device – Fuel injection system

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Details

F02D 4112

Patent

active

051935090

ABSTRACT:
In an automotive power plant including a combustion engine, intake and exhaust passages communicated with a combustion chamber for an introduction of an air-fuel mixture into and a discharge of exhaust gases from the combustion chamber, respectively, a fuel injector for injecting a controlled amount of fuel into the combustion chamber together with air sucked through the intake passage, and a throttle valve of which opening is adjustable for controlling the flow of the air through the intake passage, a fuel control system for determining the amount of fuel to be injected into the combustion chamber in dependence on the amount of air being sucked. The fuel control system includes a throttle sensor for detecting the opening of the throttle valve; and a control unit operable to determine a first fuel decrement in dependence on the amount of fuel injected at the start of a decrease in throttle opening during a deceleration of the engine when the throttle sensor detects the decrease in throttle opening at a speed higher than a predetermined value and regardless of a speed of movement of the throttle valve; to interrupt the determination of the first fuel decrement when the rate of change of the throttle valve attains a zero value; and thereafter to determine a second fuel decrement in dependence on a change in load on the engine.

REFERENCES:
patent: 4359993 (1982-11-01), Carlson
patent: 4512318 (1985-04-01), Ito et al.
patent: 4523571 (1985-06-01), Yamato et al.
patent: 4548181 (1985-10-01), Ishikawa et al.
patent: 4781163 (1988-11-01), Jautelat et al.
patent: 4984552 (1991-01-01), Nishizawa et al.

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