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:
Jul. 17, 1984
Filed:
Nov. 18, 1981
Toru Kita, Yokosuka, JP;
Nissan Motor Company, Limited, Kanagawa, JP;
Abstract
A vortex shedding device for use in measuring air flow rate into an internal combustion engine includes a duct provided therein with an element for forming vortices in air flowing through the duct. A pair of hot wires is located in the duct which are alternately exposed to vortices generated by the vortex forming element. The hot wires are associated with an electric circuit which detects variations in the resistances of the hot wires and determines the frequency at which vortices are generated in air flowing past the vortex forming element. The electric circuit contains a vortex detector for each of the hot wires so that even if one of the hot wires is broken, a pulse signal is still provided during steady operation of the engine.