Air-fuel ration control system for an automotive engine

Details Air-fuel ration control system for an automotive engine Air-fuel ration control system for an automotive engine

1987-08-05

1988-05-03

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Fuel injection system

123480, 123486, F02M 5100

Patent

active

047413123

ABSTRACT:
A first lookup table is provided for storing a plurality of basic fuel injection pulse widths from which one of pulse widths is derived in accordance with engine speed and intake-air pressure. A second lookup table is provided for storing a plurality of maximum correcting quantities for correcting a derived basic fuel injection pulse width in order to correct deviation of air-fuel ratio due to change of valve clearance of the engine. A necessary correcting quantity is obtained by multiplying a learning coefficient and a derived maximum correcting quantity. A desired fuel injection pulse width is obtained by adding the necessary correcting quantity to the derived basic fuel injection pulse width. The learning coefficient is determined so as to reduce the deviation of air-fuel ratio to an allowable value at a first updating only.

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patent: 4445481 (1984-05-01), Aoki et al.
patent: 4463730 (1984-08-01), Kishi
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patent: 4592325 (1986-06-01), Nakagawa
patent: 4651700 (1987-03-01), Kobayashi et al.
patent: 4664085 (1987-05-01), Kataoka

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