Exhaust filter backpressure indicator

Details Exhaust filter backpressure indicator Exhaust filter backpressure indicator

1992-12-31

1994-12-20

Raevis, Robert

Measuring and testing

Simulating operating condition

Marine

73 497, G01M 1500

Patent

active

053737334

ABSTRACT:
An exhaust filter backpressure indicator includes a sensor for measuring the backpressure and the exhaust system. The sensor sends a signal which is processed for indicating that an exhaust filter element is filled. The indicator includes a timer so that a signal corresponding to pressure must be maintained for a predetermined period of time before the filled element is indicated. The apparatus may also include high and low frequency discriminators to process signals within predetermined signal frequency ranges corresponding to engine operating speeds. Therefore, depending on the operation of the vehicle, the element will be indicated as being filled at either high engine speed operation or low engine speed operation.

REFERENCES:
patent: 4319896 (1982-03-01), Sweeney
patent: 4326378 (1982-04-01), Sweeney
patent: 4424671 (1984-01-01), Tokura
patent: 4492079 (1985-01-01), Takagi et al.
patent: 4842623 (1989-06-01), Zundel
patent: 4900517 (1990-02-01), Domesle et al.
patent: 4969328 (1990-11-01), Kammel
patent: 5211009 (1993-05-01), Houben et al.
Patent Abstracts of Japan; vol. 011, No. 218 (M-607) 15 Jul. 1987 & JP,A,62 035 009 (Toyota) 16 Feb. 1987.

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