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. 21, 1991
Filed:
Nov. 03, 1989
Robert D Dannenberg, Garrett, IN (US);
Navistar International Transportation Corp., Chicago, IL (US);
Abstract
A speedometer/tachometer assembly for an automotive vehicle, such as a heavy truck, has a ten section DIP switch for calibrating the speedometer and a like switch for calibrating the tachometer. When set to all '0's', each switch causes the corresponding meter to be driven by a variable frequency signal from a corresponding sensor, as calibrated by a corresponding calibration factor that has been preloaded in the non-volatile memory of a microprocessor that operates the meters. When set to all '1's', each switch causes the corresponding meter to be operated from pre-calibrated data appearing on a data link. When set to any other setting, the setting determines the calibration factor that is applied to the uncalibrated signal, and this is used to drive the corresponding meter.