Self-diagnosing apparatus and method for fuel supply control sys

Details Self-diagnosing apparatus and method for fuel supply control sys Self-diagnosing apparatus and method for fuel supply control sys

1992-05-29

1993-07-06

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02M 5100

Patent

active

052244610

ABSTRACT:
A self diagnosing apparatus and method for a fuel supply control system in an internal comustion engine are disclosed in which since an air/fuel mixture ratio feedback controlled variable is set so that an actual air/fuel mixture ratio is approached to a target (stoichiometric) air/fuel mixture ratio and movement (incremental or decremental change width) of the air/fuel mixture ratio feedback-controlled variable indicates a deviation of the actual air/fuel mixture ratio from the target air/fuel mixture ratio, a diagnosis of the air/fuel mixture ratio controlled state by means of the fuel supply control system is carried out on the basis of at least one of either a total sum of each magnitude by which the air/fuel mixture ratio feedback controlled variable is changed to enrich or enlean the air/fuel mixture ratio so as to approach it to the target air/fuel mixture ratio or a control duration of time during which the air/fuel mixture ratio feedback control variable is set to control the air/fuel mixture ratio.

REFERENCES:
patent: 4844038 (1989-07-01), Yamato et al.
patent: 4924836 (1990-05-01), Uchida et al.
patent: 5065728 (1991-11-01), Nakinawa
patent: 5090387 (1992-02-01), Mayor et al.
JP-1-60-90944 Japanese Abstract, dated Oct. 24, 1983.
JP-A-1-6H14 190142 Japanese Abstract, dated Sep. 12, 1985.

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