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:
May. 23, 1989
Filed:
Mar. 03, 1987
Wolfgang Porth, Frankfurt am Main, DE;
Wolfgang Weibler, Hofheim, DE;
VDO Adolf Schindling AG, Frankfurt am Main, DE;
Abstract
In a measurement probe for measuring the mass of a flowing fluid, particularly the intake air of an internal-combustion engine, having at least one temperature-dependent first resistor which is arranged in the flow of the fluid and is part of a bridge circuit and the temperature and/or resistance of which is controlled as a function of the flowing mass, the actuating variable being a measure of the mass of the flowing fluid, a second resistor which is connected in parallel to the bridge circuit is arranged in the fluid downstream of the first resistor. In this way, the probe is directionally sensitive. Erroneous measurements by reverse flow are avoided. Furthermore, a third resistor, which is also part of the bridge circuit and is connected in series with the first resistor, can be arranged upstream in front of the first resistor directly in the fluid. This contributes to reducing the response time.