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. 10, 2001
Filed:
Nov. 05, 1999
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
In a relative velocity detecting apparatus for an automotive vehicle applicable to an automatic vehicular velocity control system to follow up a preceding vehicle, an inter-vehicle distance detector is provided which is disposed on the vehicle so as to be oriented toward a forward detection zone of the vehicle to detect an inter-vehicle distance to the preceding vehicle which is running ahead of the vehicle, to recognize whether the preceding vehicle has entered the forward detection zone and to derive the inter-vehicle distance value lrn (n=1, 2, . . . , n) whenever a predetermined period of time has passed when recognizing that the preceding vehicle has entered the forward detection zone, a relative velocity calculator is provided to perform a band pass filter calculation for the inter-vehicle distance value lrn, the band pass filter being expressed as: CF,·S/(S,+CF,·S+CF,), wherein CF,and CF,denote constants, and to calculate a relative velocity value vr of the preceding vehicle to the vehicle according to the above equation, and an initial value setting section is provided to set a first initial value lr,of the inter-vehicle distance value and a second initial value vr,of the relative velocity value in the band pass filter calculation by the relative velocity calculator during a run of the vehicle.