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:
Mar. 19, 2002
Filed:
Jan. 21, 2000
Applicant:
Inventors:
Dong-il Cho, Seoul, KR;
Sung-Wook Kim, Seoul, KR;
Hyungjin Kim, Seoul, KR;
Jae-in Ko, Kyungki-do, KR;
Assignee:
Dong-il CHO, Seoul, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F 1/900 ; G06G 7/70 ; G06G 7/76 ;
U.S. Cl.
CPC ...
G06F 1/900 ; G06G 7/70 ; G06G 7/76 ;
Abstract
A vehicle detector comprising a loop sensor, phase lock loop (PLL), frequency change detector, and a micro-processor including a logic circuit. Output of the PLL and the frequency change detector is inputted to the logic circuit, and the logic circuit performs logical OR operation of the output of the PLL and the output of the frequency change detector. The output of the logic circuit is used as a vehicle detection signal. The vehicle detector can detect vehicles at a low speed as well as vehicle at high speed accurately.