Measuring and testing – With fluid pressure – Leakage
Patent
1998-03-06
2000-01-25
Larkin, Daniel S.
Measuring and testing
With fluid pressure
Leakage
73 405R, 73 497, G01M 332
Patent
active
060166908
ABSTRACT:
A leak detection method for an on-board evaporative emission leak detection system that detects leakage from an evaporative emission space of a fuel system of an automotive vehicle. During a leak detection test, a vent valve closes, and a purge valve, that selectively communicates the evaporative emission space with the engine intake manifold, opens to cause vacuum to be drawn in the evaporative emission space. A vacuum regulator valve regulates evaporative emission space vacuum to a defined vacuum. Subsequently, the purge valve closes. Loss of vacuum, indicative of leakage, is signaled by a pressure sensor. An algorithm detects a substantially constant rate of vacuum loss and then measures the amount of loss over a defined time interval. That measurement is then compensated for volume of the evaporative emission space and rate of fuel volatilization to arrive at a value forming a basis for making a leakage determination.
REFERENCES:
patent: 4628959 (1986-12-01), Parker et al.
patent: 4886085 (1989-12-01), Miller
patent: 5277167 (1994-01-01), DeLand et al.
patent: 5327776 (1994-07-01), Yasui et al.
patent: 5623911 (1997-04-01), Kiyomiya et al.
patent: 5637788 (1997-06-01), Remboski et al.
patent: 5644072 (1997-07-01), Chirco et al.
patent: 5727530 (1998-03-01), Honda et al.
patent: 5730107 (1998-03-01), Blumenstock
patent: 5749349 (1998-05-01), Detweiler et al.
patent: 5803054 (1998-09-01), Yamazaki et al.
patent: 5817925 (1998-10-01), Cook et al.
patent: 5850819 (1998-12-01), Kunimitsu et al.
patent: 5853018 (1998-12-01), DeLand et al.
patent: 5853162 (1998-12-01), Zurke
Cook John E.
Perry Paul D.
Terek Paul V.
Larkin Daniel S.
Siemens Canada Limited
LandOfFree
Automotive evaporative emission leak detection system and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Automotive evaporative emission leak detection system and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automotive evaporative emission leak detection system and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2309203