Patent ID: 6367457
Filing Date: 2002-04-09
Classification: B60K,F02M

Abstract:
An evaporative emission control system for providing fuel vapor to an internal combustion engine, comprising:a fuel storage tank having an outlet port for allowing fuel vapors to exit said tank; a canister for storing fuel vapor generated within said fuel tank; said canister having a first port for receiving air into said canister and a second port for both receiving fuel vapor from said fuel tank and allowing the exit of fuel stored vapor from said canister when said canister is purged; a first vapor line connecting said tank outlet port with said second outlet port; a vapor control valve for controlling the flow of vapor through said first vapor line; a second vapor line connecting said first vapor line with said engine; a purge valve for controlling the flow of vapor through said second line to said engine; a first pressure sensor for sensing the pressure of said fuel vapor in said tank; a second pressure sensor for sensing the pressure of said vapor in said canister independent of the pressure in said tank; a controller connected with first and second pressure sensors for controlling the operation of said vapor valve and said purge valve, such that said tank is isolated from said engine and said canister when said canister is purged.