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:
Dec. 06, 1994
Filed:
Mar. 29, 1993
Shinji Ikeda, Susono, JP;
Hiroshi Naganawa, Kakamigahara, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Nippondenso Co., Ltd., Aichi, JP;
Abstract
A Doppler-effect speed detecting apparatus for detecting a ground speed of a vehicle, including a transmitter for transmitting a wave towards the ground surface, a receiver for receiving the wave reflected by the ground surface, and an output device for producing an output indicative of the ground speed according to the frequencies of the transmitted and reflected waves. The apparatus further includes a device for determining presence or absence of abnormality relating to the output of the output device, on the basis of an output level of the receiver as well as a speed difference between the ground speed obtained by the output device and an estimated vehicle speed which is obtained on the basis of rotating speeds of the vehicle wheels.