Patent · US Active

Method for checking the function of a tank venting valve

US8359911B2 · kind B2 · utility

0Cited by

3References

18Claims

0Family size

Assignee

AUDI AG · DE

Inventors

Oliver Grunwald · Hockenheim, DE
Siegfried Meixner · Hitzhofen, DE
Peter Enders · Frankfurt, DE

Key dates

Filing date	Dec 18, 2009
Grant date	Jan 29, 2013
Priority date	—
Expiry date	Mar 28, 2031

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02M25/0827
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

The invention relates to a method for checking the function of a tank venting valve between the intake manifold of an internal combustion engine and a fuel tank or a fuel vapor reservoir in which the tank venting valve in operation of the internal combustion engine is opened several times and is closed again after a short opening time and in which during repeated opening and closing the time characteristic of a quantity which is dependent on the opening state of the tank venting valve is recorded. In order to enable a reliable function check of the tank venting valve even in the case of very small and/or time-shifted amplitudes of the quantity to be monitored, it is proposed, according to the invention, that the first derivative of the time characteristic of the quantity be evaluated.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.