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

1987-07-31

1988-04-19

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Fuel injection system

123489, 36443105, F02D 4126

Patent

active

047382384

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.

REFERENCES:
patent: 4430976 (1984-02-01), Kondo et al.
patent: 4461261 (1984-07-01), Isomura et al.
patent: 4566420 (1986-01-01), Sakamoto et al.

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