Method of checking the operational functionality of a tank venting system for a motor vehicle

US6082189A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Klaus Bayerle · Obertraubling, DE
• Michael Henn · Lehre, DE
• Hong Zhang · Tegernheim, DE

Key dates

• Filing date: Mar 27, 1998
• Grant date: Jul 4, 2000
• Expiry date: Mar 27, 2018

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M25/0809
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The tank venting system is evacuated by the negative pressure prevailing in the intake pipe of the internal combustion engine. A regression calculation, based on a physical model which simulates the pressure variation in the event of a leak in the tank venting system, on the basis of a gas mass flow flowing through an opening, supplies a parameter which describes the curve variation of the pressure during the test for gassing out fuel and during the diagnosis. The parameter contains the information about the leak area and takes into account external influences that interfere with the signal evaluation.