Diagnostic arrangement for automotive engine EGR system

Details Diagnostic arrangement for automotive engine EGR system Diagnostic arrangement for automotive engine EGR system

1990-06-19

1992-04-14

Raevis, Robert

Measuring and testing

Simulating operating condition

Marine

G01M 1500

Patent

active

051036550

ABSTRACT:
When the engine throttle valve is closed or very nearly closed, the induction vacuum assumes a level whereat the flow of exhaust gas through the EGR conduit can be induced to assume a sonic level and maximize. Under these conditions, by opening the EGR control valve and checking the change in induction pressure, the amount of recirculation can be monitored in a manner which enables partial EGR conduit blockage and/or similar types of malfunctions to be detected.

REFERENCES:
patent: 4715348 (1987-12-01), Kobayashi et al.
patent: 4825841 (1989-05-01), Norota et al.

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