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. 21, 1990
Filed:
Aug. 09, 1989
Francis E Kruncos, Fond du Lac, WI (US);
Brunswick Corporation, Skokie, IL (US);
Abstract
A tachometer signal conditioning circuit (20) includes a timer circuit (48) responsive to ignition pulses from the primary lead (28) of an internal combustion engine ignition coil (26), and outputting a timing pulse terminating after a given time delay interval during which RFI, EMI and other transients on the primary lead (28) are ignored. A one shot monostable multivibrator circuit (56) responds to the trailing edge of the timing pulse and outputs a trigger pulse of given duration. A switch circuit (66) is connected to the battery circuit (22) and is turned on by the leading edge of the trigger pulse and turned off by the trailing edge of the trigger pulse, all before the next ignition pulse. The switch circuit (66) has a node (80) providing an input for a standard low voltage tachometer (82). Conductive and nonconductive states of the switch circuit (66) change the battery circuit voltage at the node (80) at a frequency corresponding to the frequency of the ignition pulses.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile