Fuel system and method
AssigneeRoush Enterprises, Inc.
InventorsPaul Keener Shipp, Erin Dmytrow, Sean Clay, Adam Cavanaugh
Life of this patent
Estimating the term…
Abstract
A fuel system and method of controlling the fuel system in an engine using a liquid propane fuel wherein a fluid pressure control module 11 having a housing 12 and plurality of solenoids 20 are provided for venting the fuel pressure in the fuel rails of the fuel system after shut down of the vehicle to reduce fuel leakage from the fuel injectors and fuel rail by having a fuel bleed 20B solenoid vent the fuel pressure in the fuel rail to an evaporative emissions canister, while other solenoids (20R, 20F and 20S) are shut, to further eliminate evaporative fuel emissions from the vehicle during engine shut down.
Claims11
A fuel pressure control module, comprising:
- a valve body assembly having a fuel supply line connection, a fuel return line connection, a fuel rail line connection and a bleed line connection for connection to an evaporative emissions canister;
- a fuel supply valve for selectively interrupting the fuel supply from the fuel tank;
- a fuel bleed valve for selectively interrupting the supply of fuel from the fuel system to the evaporative emissions canister;
- a fuel return valve for selectively interrupting the fuel return line;
- a fuel flush valve for selectively interrupting the flow of fuel to the fuel tank;
- wherein the fuel supply valve, the fuel return valve and the fuel flush valve can all be closed while the fuel bleed valve is open to reduce pressure in the fuel rail and fuel injectors to reduce the evaporative emissions there from.
A fuel pressure control module include a valve body assembly having a fuel supply line connection, a fuel return line connection, a fuel rail line connection and a bleed line connection for connection to an evaporative emissions canister;
- a fuel supply solenoid for selectively interrupting the fuel supply from the fuel tank;
- a fuel bleed solenoid for selectively interrupting the supply of fuel from the fuel system to the evaporative emissions canister;
- a fuel return solenoid for selectively interrupting the fuel return line;
- a fuel flush solenoid for selectively operating the flow of fuel to the fuel tank wherein the fuel flush solenoid does not completely interrupt the fuel flow;
- and
- wherein the fuel supply solenoid, the fuel return solenoid and the fuel flush solenoid can all be closed while the fuel bleed valve is open to reduce pressure in the fuel rail and fuel injectors to reduce the evaporative emissions there from.
A method of operating a fuel pressure control module, wherein the fuel pressure control module includes a valve body assembly having a fuel supply line connection, a fuel return line connection, a fuel rail line connection and a bleed line connection for connection to an evaporative emissions canister;
- a fuel supply valve for selectively interrupting the fuel supply from the fuel tank;
- a fuel bleed valve for selectively interrupting the supply of fuel from the fuel system to the evaporative emissions canister;
- a fuel return valve for selectively interrupting the fuel return line;
- a fuel flush valve for selectively interrupting the flow of fuel to the fuel tank;
- the method comprising the steps of:
- closing the fuel supply valve, the fuel return valve and the fuel flush valve;
- and
- opening the fuel bleed valve to reduce pressure in the fuel rail and fuel injectors and to vent the evaporative emissions there from to a fuel canister to less the evaporative emissions from the fuel system.
Dependencies are inferred from the claim text.