Apparatus for monitoring leakage into exhaust lines

Details Apparatus for monitoring leakage into exhaust lines Apparatus for monitoring leakage into exhaust lines

1993-06-11

1994-10-04

Raevis, Robert

Measuring and testing

With fluid pressure

Leakage

73 46, 73 497, 731181, G01M 304

Patent

active

053515269

ABSTRACT:
Apparatus for monitoring suction leakage of external air into the exhaust gas path of an internal combustion engine during intermittent reduced pressure phases of engine running, includes two oxygen concentration sensing lambda probes arranged at a distance from one another along the path. The probes issue signals indicative of such oxygen concentration which are fed to a control device, such that an error signal is generated on deviation of the two probe signals from one another as caused by suction entry of external air into the path solely during a reduced pressure phase.

REFERENCES:
patent: 3998095 (1976-12-01), Tinkham et al.
patent: 4819602 (1989-04-01), Mieno et al.
patent: 5251604 (1993-10-01), Kaneko et al.
Computerized Engine Controls; Dick H. King; Glendale Community College; Ch. 6, pp. 181-191; 1987.
Methods of On-Board Misfire Detection; G. Plapp, M. Klenk, and W. Moser; SAE Paper 900232 (1990).

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