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. 13, 1986
Filed:
Nov. 21, 1983
Dieter Handtmann, Sindelfingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The invention is directed to an arrangement for determining the mass rate of flow of a flowing medium, especially the mass rate of flow of air required in the combustion process of an internal combustion engine. The arrangement of the invention includes at least two temperature-dependent resistors which are placed directly in the flowing medium. The arrangement further includes two actively operated bridge connected to respective operational amplifiers. By means of a simple arithmetic coupling of the values of both bridge currents, an output signal is obtained which uniquely serves as an indication of the mass rate of flow and is independent of the temperature of the flowing medium. The condition that the two temperature-dependent resistors are operated at constant temperature independently of the temperature of the flowing medium permits further improvements to be realized. More specifically, the two temperature-dependent resistors can be configured as film resistors on a massive substrate without any loss in the speed of response. By utilizing two temperature-dependent resistors in a single bridge, an improved sensitivity of the arrangement can be obtained and an indication of the direction of flow of the medium can be achieved.