System for monitoring leakage into exhaust lines

Details System for monitoring leakage into exhaust lines System for monitoring leakage into exhaust lines

1993-06-11

1995-01-31

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123690, 731181, F02D 4114, F02D 4122

Patent

active

053851340

ABSTRACT:
A system for monitoring suction leakage of external air into the exhaust gas path of an internal combustion engine during intermittent reduced pressure phases of the engine, during operation, includes an oxygen concentration sensing lambda probe arranged in the path. The probe issues an output signal having a reduced pressure phase pulsation frequency component of reduced pressure phase amplitude indicative of such oxygen concentration during the reduced pressure phases. The output signal is fed to a control device which generates an error signal when that amplitude exceeds a predetermined threshold level indicative of suction entry of external air into the path during a reduced pressure phase.

REFERENCES:
patent: 3998095 (1976-12-01), Tinkham et al.
patent: 5094214 (1992-03-01), Kotzan
Exhaust Control, Automotive; Kirk-Othmer Encyclopedia of Chemical Technology; vol,. 9, pp. 494-508. (date unknown).
Methods of On-Board Misfire Detection; G. Plapp, M. Klenk, and W. Moser; SAE Paper 900232 (1990). (month unknown).

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