Title:
DETECTION OF EVAP PURGE HYDROCARBON CONCENTRATION
Document Type and Number:
WIPO Patent Application WO2004083341
Kind Code:
A3
Abstract:
In a system and a method for purging a vapor storage canister having adsorbed fuel vapor (or hydrocarbon vapor) by drawing air through the storage canister the storage canister being coupled with an engine having a system for controlling the amount of fuel provided to the engine, the amount of fuel vapor in the purge is determined by subtracting from a known total flow rate of air and vapor from the canister a measured air flow rate of air into the canister. The total flow rate of air and vapor from the canister may be obtained, for example, by knowing the intake manifold vacuum, by using a pump at a given flow rate capacity to draw the air and vapor through the canister, or by using a valve having a given flow rate that limits the flow rate of the air and vapor mixture drawn from the canister. An ECM or PCM can use the information of fuel vapor flow from the canister obtained in this way for better fuel control.
Inventors:
REDDY SAM R (US)
Application Number:
PCT/US2004/007997
Publication Date:
February 03, 2005
Filing Date:
March 16, 2004
Export Citation:
Assignee:
GEN MOTORS CORP (US)
REDDY SAM R (US)
REDDY SAM R (US)
International Classes:
F02D41/00; F02D41/18; F02M25/08; F02M37/10; (IPC1-7): F02M37/04
Foreign References:
| US5249561A | 1993-10-05 | |||
| US5373822A | 1994-12-20 | |||
| US6321735B2 | 2001-11-27 |
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