Apparatus and method for periodically cleaning a charcoal canister and for periodically checking leak-tightness of a fuel system of an internal combustion engine

US5975062A · kind A · utility

Assignee

• PIERBURG GMBH · DE

Inventors

• Michael Bonse · Düsseldorf, DE
• Gunter Van De Venne · Mönchengladbach, DE

Key dates

• Filing date: Mar 11, 1998
• Grant date: Nov 2, 1999
• Expiry date: Mar 11, 2018

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M25/0818
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method and apparatus for periodically air-washing a charcoal canister and for testing leak-tightness of a closed fuel supply system of an internal combustion engine in which a reversible electric air pump is installed in a line connecting the fuel system and the canister to the intake manifold of the engine upstream of the choke valve. In one direction of operation of the pump, ambient air is sucked through the canister and fed to the intake manifold to wash the canister and in the other direction of operation of the pump, air is pumped from above the choke valve in the intake manifold to the fuel system to pressurize the system to check leak-tightness thereof. When the engine is turned off, the pump is shut off and the fuel supply system is connected to the canister.