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:
Aug. 10, 1982
Filed:
Jun. 18, 1980
Werner Herden, Stuttgart, DE;
Hans Neu, Vaihingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The interior of a differential pressure cell is exposed to the pressure in the intake pipe of an internal combustion engine. An absolute pressure cell is exposed to the ambient air pressure. The movable membrane of the differential pressure cell carries a plate on which are mounted two permanent magnets whose North poles face one another. A Hall generator fastened to the center of the movable membrane of the absolute pressure cell moves in the gap between the two magnets. The effective magnetic field applied to the Hall generator thus varies with the relative position of the Hall generator and the magnets. Adjustment of the spring constants of the two membranes allows any linear combination of differential and absolute pressure to be formed. Embodiments of different complexity and different degrees of linearity are illustrated.