Trouble detection system for internal combustion engine

Details Trouble detection system for internal combustion engine Trouble detection system for internal combustion engine

1995-02-03

1996-08-06

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02D 4100

Patent

active

055424040

ABSTRACT:
A malfunction detecting system for an internal combustion engine utilizes an air/fuel ratio feedback control loop. Namely, feedback factors #nKLAF operate to absorb the air/fuel ratio variance between cylinders and to converge the individual cylinders' air/fuel ratios to the confluence point air/fuel ratio, while another feedback factor KLAF operates to converge the confluence point air/fuel ratio to a desired air/fuel ratio, converging all cylinders' air/fuel ratios to the desired air/fuel ratio. With this arrangement, any of the feedback factors #nKLAF for a certain cylinder becomes a prescribed value, it can therefore be assumed that any abnormality would occur in a part such as the fuel injector which would affect the air/fuel ratio in the cylinder concerned. Similarly, if the confluence point air/fuel ratio feedback factor KLAF becomes another prescribed value, it can be assumed that any abnormality would occur in a part such as the fuel pressure system which would affect the air/fuel ratios of all the cylinders. By discriminating these factors, malfunctions can be detected immediately and accurately.

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patent: 5197450 (1993-03-01), Kitajima et al.
patent: 5213088 (1993-05-01), Harada

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