Arrangement for the detection of deficiencies in a tank ventilation system

US5085197A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Gerhard Mader · Thalmässing, DE
• Hans Meixner · Haar, DE
• Hans Schreiber · Aichach, DE

Key dates

• Filing date: Jul 26, 1990
• Grant date: Feb 4, 1992
• Expiry date: Jul 26, 2010

Classification

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

Abstract

With the present tank ventilation system formed of a fuel tank, an active carbon filter, a control unit, a lambda probe, a tank ventilation valve and a flow sensor it is possible to recognize defects at the connecting lines and the ventilation valve immediately. For the recognition of the defect, a control unit is provided which examines the signals arriving from the lambda probe and from the flow sensor along with the outgoing tank ventilation control signals for unreasonable events. When a defect is recognized, the error signal is stored. A ceramic PTC resistor is preferably employed as the flow sensor.