Air/fuel mixture ratio learning control system for internal comb

Details Air/fuel mixture ratio learning control system for internal comb Air/fuel mixture ratio learning control system for internal comb

1990-06-29

1992-09-22

Lall, Parshotam S.

Boots, shoes, and leggings

36443104, 123 1A, 123486, 123494, 123575, F02M 5100

Patent

active

051503018

ABSTRACT:
An air/fuel mixture ratio learning control system for an internal combustion engine using a mixed fuel employs a learnt correction coefficient which is used both in a FEEDBACK mode air/fuel ratio control and in an OPEN LOOP mode air/fuel ratio control. The learnt correction coefficient is derived based on a FEEDBACK air/fuel ratio dependent correction coefficient per one of preselected engine driving ranges and per one of preselected concentration ranges of one fuel component contained in the mixed fuel. The learnt correction coefficient is cyclically derived in a preselected stable engine driving condition during the FEEDBACK mode air/fuel ratio control for updating a previously derived and stored one to minimize a deviation of the FEEDBACK correction coefficient from a reference value. The control system performs the FEEDBACK mode air/fuel ratio control with the FEEDBACK correction coefficient and the learnt correction coefficient, while the control system performs the OPEN LOOP mode air/fuel ratio control with the learnt correction coefficient.

REFERENCES:
patent: 4546732 (1985-10-01), Mae et al.
patent: 4706629 (1987-11-01), Wineland et al.
patent: 4909225 (1990-03-01), Gonze et al.
patent: 4945863 (1990-08-01), Schmitz et al.
patent: 4945880 (1990-08-01), Gonze et al.
patent: 4967714 (1990-11-01), Inoue
Japanese Publication No. 59-203828, Appln. No. 58-76221, dated Nov. 19, 1984.

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