Method and system for estimating fuel vapor pressure

Details Method and system for estimating fuel vapor pressure Method and system for estimating fuel vapor pressure

1997-06-02

1999-03-09

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

F02M 3304

Patent

active

058787275

ABSTRACT:
A method for estimating fuel vapor pressure includes determining (102) an amount of fuel present in a fuel tank, pumping (104) a vapor mixture from the fuel tank until a predetermined gauge pressure is obtained, and measuring (108) the time necessary to reach the predetermined gauge pressure. Fuel vapor pressure is than directly quantified (108) based on the measured time and the detected fill level. Thus, an estimate of the fuel vapor pressure can be obtained without requiring information regarding fuel temperature, or addition of any dedicated sensor circuitry to a conventional on-board vapor management/leak detection system.

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