Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1987-09-17
1989-08-08
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Fuel injection system
123493, F02D 4112, F02D 4114
Patent
active
048542873
ABSTRACT:
An apparatus for learning and controlling an air/fuel ratio in an engine wherein a fuel injection quantity Ti is computed by correcting a basic fuel injection quantity Tp by a feedback correction coefficient LAMBDA based on a detected air/fuel ratio. Deviation of LAMBDA from a reference value during the feedback control is learned to determine a learning correction coefficient, and on computation of Ti, Tp is corrected by a learning correction coefficient. A base air/fuel ratio obtained from Ti computed without correction by LAMBDA is made in agreement with an aimed air/fuel ratio and during the feedback control, Ti is computed by further correcting the air/fuel ratio by LAMBDA. The learning correction coefficient is divided into an altitude 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, and Ti is computed according to Tp, LAMBDA, K.sub.ALT and K.sub.MAP. The deviation of the change of the air density is indiscriminately learned according to a deceleration proportion and K.sub.ALT is rewritten. Where only the deviation in the air density can be learned, the deviation in the air density is indiscriminately learned and K.sub.ALT is rewritten, and in the other region, the deviation by dispersion of a part is learned for the respective areas and the 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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