Diagnostic system for detecting faults in engine air intake chec

Details Diagnostic system for detecting faults in engine air intake chec Diagnostic system for detecting faults in engine air intake chec

1991-07-01

1992-08-18

Raevis, Robert

Measuring and testing

Simulating operating condition

Marine

G01M 1500

Patent

active

051388740

ABSTRACT:
A system is disclosed for diagnosing faulty check valve operation in an internal combusiton engine having a back flow preventing check valve positioned in each intake air passage leading to an engine cylinder. The system measures the pressure in the engine air induction system, upstream of each check valve and downstream from an air intake throttle valve. The system produces an indication of faulty check valve operation, when an abnormal fluctuation in the measured pressure is detected. Preferably, the diagnostic function is performed when the engine operates in a defined mode, at idle speeds with light engine loading, where the pressure differential appearing across each check valve is essentially maximized. The engine cylinder associated with a faulty check valve is identified based upon the sensed rotational position of the engine when an abnormal fluctuation in pressure is detected.

REFERENCES:
patent: 4694693 (1987-09-01), Gerlowski

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