Vehicle engine fuel system diagnostics

Details Vehicle engine fuel system diagnostics Vehicle engine fuel system diagnostics

1991-06-05

1992-03-10

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Fuel injection system

123489, F02D 4122

Patent

active

050942140

ABSTRACT:
The fuel system of an internal combustion engine diagnosed based on a learn term adjusted in response to a closed loop adjustment of the air fuel ratio and which is used along with the closed loop adjustment to determine the fuel amount supplied to the engine. The learn term is adjusted at a first rate based on the integral correction term. If the learn term reaches a predetermined primary rich or lean limit value and the closed loop integral adjustment reaches its authority limit, the learn term is further adjusted at a second rate that is slower than the first rate. When the learn term exceeds a predetermined secondary rich or lean limit value representing an adjustment that is greater than the adjustment represented by the corresponding primary rich or lean limit value, a fuel system fault is indicated.

REFERENCES:
patent: 4306529 (1981-12-01), Chiesa et al.
patent: 4309971 (1982-12-01), Chiesa et al.
patent: 4502443 (1985-03-01), Hasegawa et al.
patent: 4638658 (1987-01-01), Otobe
patent: 4644920 (1987-02-01), Abe et al.
patent: 4671107 (1987-06-01), Chiesa et al.
patent: 4671243 (1987-06-01), Deutsch
patent: 4850324 (1989-07-01), Furuyama

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