Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1987-09-17
1989-07-25
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Fuel injection system
F02D 4114, F02D 4134
Patent
active
048503266
ABSTRACT:
An apparatus for learning and controlling an air/fuel ratio in an engine having an air/fuel feedback control function wherein a fuel injection quantity Ti is computed by correcting a basic fuel injection quanity Tp by a feedback correction coefficient LAMBDA based on a detected air/ful ratio. Deviation of LAMBDA from a reference value during feedback control is determined to further determine a learning correction coefficient. Upon computation of Ti, Tp is corrected by a learning coefficient. A base air/fuel ratio obtained from Ti computed without correction by LAMBDA is made based on a desired air/fuel ratio. During feedback control, Ti is computed by further correcting the air/fuel ratio by LAMBDA. The learning correction coefficient is divided into an indiscriminate learning correction coefficient K.sub.ALT for learning deviation by the change of the air density with respect to all the areas of the engine driving state and an area-wise learning correction coefficient K.sub.MAP for learning the deviation by dispersion of a part for the respective area. Ti is computed according to Tp, LAMBDA, K.sub.ALT and K.sub.MAP. Where only the deviation by the change of the air density can be learned, the deviation is indiscriminately learned and K.sub.ALT is rewritten. In the other regions, the deviation by dispersion of a part is learned for the respective areas and K.sub.MAP is rewritten.
REFERENCES:
patent: 4615319 (1986-10-01), Tomisawa
patent: 4655188 (1987-04-01), Tomisawa et al.
patent: 4715344 (1987-12-01), Tomisawa
patent: 4726344 (1988-02-01), Ando et al.
patent: 4729359 (1988-03-01), Tomisawa et al.
Argenbright Tony M.
Japan Electronic Control Systems Co. Ltd.
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