Method for diagnosing variable intake system

Details Method for diagnosing variable intake system Method for diagnosing variable intake system

2007-09-18

2007-09-18

Cronin, Stephen K. (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

C123S090150, C701S114000

Reexamination Certificate

active

11266648

ABSTRACT:
An internal combustion engine comprises an engine controller (ECU) governing fuel supply to the combustion engine by a fuelling map, which adapts the amount of fuel supplied to the engine responsive to engine speed, engine load and a volumetric efficiency of the engine. A variable intake system with at least one valve changes an effective tuning length of said variable intake system wherein degradation of said variable intake system can be diagnosed by comparing a calculated pressure variation of an inlet pressure of said variable intake system with a predetermined value for the pressure variation. The engine controller (ECU) adapts the fuelling map responsive to the diagnosis of degradation of the at least one valve of the variable intake system.

REFERENCES:
patent: 5138874 (1992-08-01), Davis
patent: 5201296 (1993-04-01), Wunning et al.
patent: 6640543 (2003-11-01), Seal
patent: 6807938 (2004-10-01), Majewski et al.

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