Air-fuel ratio control system for an automotive engine

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

1987-08-05

1988-09-20

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

123440, F02D 4114

Patent

active

047717530

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 updated by 1/2 at every updating.

REFERENCES:
patent: 4445481 (1984-05-01), Aoki et al.
patent: 4461261 (1984-07-01), Isomura et al.
patent: 4530333 (1985-07-01), Nishimura
patent: 4545355 (1985-10-01), Takao et al.
patent: 4625699 (1986-12-01), Kobayashi et al.

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