Method and apparatus for closed loop fuel control

Details Method and apparatus for closed loop fuel control Method and apparatus for closed loop fuel control

1989-04-03

1990-02-27

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Fuel injection system

123494, 73119A, F02D 4114

Patent

active

049036696

ABSTRACT:
In an engine having direct fuel injection or injection at individual intake ports, the fuel injectors are of the positive displacement type and are equipped with plunger displacement sensors to yield a displacement signal representing the quantity of fuel injected. This signal is used as feedback to a closed loop PID control which compares the injected quantity to a demand quantity to determine an error and calculates a control pulsewidth which reduces the error eventually to zero. An open loop injector calibration of pulsewidth versus approximate fuel quantity is used as a base pulsewidth to which the closed loop adds a correction value.

REFERENCES:
patent: 4372266 (1983-02-01), Hiyama et al.
patent: 4428354 (1984-01-01), Sundeen et al.
patent: 4483480 (1984-11-01), Yasuhara
patent: 4502438 (1985-03-01), Yasuhara
patent: 4838080 (1989-06-01), Okano
patent: 4844035 (1989-07-01), Takagi

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