Method and apparatus for monitoring a controllable valve

Details Method and apparatus for monitoring a controllable valve Method and apparatus for monitoring a controllable valve

2005-01-11

2005-01-11

Moulis, Thomas N (Department: 3747)

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

C073S579000, C073S118040

Reexamination Certificate

active

06840233

ABSTRACT:
The invention relates to a method and an arrangement for monitoring the operational status of a cyclically operated valve (5, 19), which valve is operated to allow a fluid or gaseous medium to flow from a first conduit (1, 18) to a second conduit (3, 20) due to a pressure difference between said conduits, whereby the valve (5, 19) operated using predetermined duty cycles. The method involves measuring pressure oscillations caused by the valve (5, 19) and generating an output signal, performing a frequency analysis on the signal to determine an amplitude for the signal at an oscillation frequency, comparing the amplitude of the oscillations to an expected amplitude for the oscillation frequency, and generating an error signal is if the difference between the calculated and the expected amplitudes exceeds a predetermined limit.

REFERENCES:
patent: 4791810 (1988-12-01), Old et al.
patent: 5138874 (1992-08-01), Davis
patent: 5404748 (1995-04-01), Jimison et al.
patent: 5426971 (1995-06-01), Glidewell et al.
patent: 5493902 (1996-02-01), Glidewell et al.
patent: 5780728 (1998-07-01), Takamori
patent: 6082337 (2000-07-01), Fujimoto et al.
patent: 6131448 (2000-10-01), Hyodo et al.
patent: 6637267 (2003-10-01), Fiebelkorn et al.

Affiliated with

Also associated with

Rating

Method and apparatus for monitoring a controllable valve does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for monitoring a controllable valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for monitoring a controllable valve will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3408923