Fuel system with pressure regulation and pressure relief

US7469683B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Paul Mason · Dearborn, US
• Werner Schneider · Erbach, DE
• John Lennen · Wixom, US
• Martin Kling · Uppsala, SE
• Martin Ptacek · České Budějovice, CZ
• David Liskovec · Hluboká nad Vltavou, CZ
• Martin Sykora · České Budějovice, CZ
• Thomas Wieland · Stuttgart, DE
• Erik Hahmann · Ditzingen, DE

Key dates

• Filing date: Mar 29, 2007
• Grant date: Dec 30, 2008
• Expiry date: Mar 29, 2027

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M37/106
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel supply system is provided for delivering fuel from a tank to an engine of a motor vehicle through a fuel line. The system is provided with a pressure relief valve to divert fuel from the fuel line during engine shut down conditions when fuel flow to the engine is not desired. The pressure relief valve has a fuel outlet that is provided with backpressure during engine operation. The backpressure enables the pressure relief valve to be set at a lower level because the backpressure is added to set point pressure to determine opening of the pressure relief valve. Lowering the set point of the pressure relief valve allows fuel to be diverted from the engine at a lower fuel line pressure. In one embodiment backpressure is provided by fluid communication from a jet pump supplying fuel from the fuel tank to a fuel system reservoir.