The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 04, 1992
Filed:
Jul. 26, 1990
Applicant:
Inventors:
Assignee:
Siemens Aktiengesellschaft, Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F02M / ;
U.S. Cl.
CPC ...
123520 ; 123516 ; 123518 ;
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.