Tank-venting arrangement and method of operating the same

US5197442A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Andreas Blumenstock · Ludwigsburg, DE
• Helmut Denz · Stuttgart, DE
• Ulrich Steinbrenner · Kohlhof, DE
• Ernst Wild · Oberriexingen, DE

Key dates

• Filing date: Dec 20, 1991
• Grant date: Mar 30, 1993
• Expiry date: Dec 20, 2011

Classification

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

Abstract

A tank-venting arrangement includes: a tank having a tank closure; an electrically drivable check valve; an adsorption filter; connecting lines for interconnecting the above components; a difference pressure sensor which measures the pressure difference between the pressure in the tank and the ambient pressure and supplies a pressure difference signal; a comparator which, at least for a running engine, compares the pressure difference signal to upper and lower threshold values and supplies an opening signal to the check valve to open the latter when the pressure difference signal is greater than the upper threshold value and a closure signal for closing the check valve when the pressure difference signal drops below the lower threshold value; and, a detector unit which supplies an opening signal to the check valve for opening the check valve when the sensor determines a possible opening of the tank and a closure signal for closing the check valve when the sensor determines a possible closure of the tank. With the aid of the check valve and the difference pressure sensor which measures the pressure difference between the pressure in the tank and the ambient pressure, the tank-ventin…