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:
Apr. 20, 2004
Filed:
Sep. 12, 2000
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A control apparatus for a ventilator that ventilates a tunnel in response to visibility of the inside of the tunnel, including at least one picture image input device configured to take a picture of the inside of the tunnel, a visibility index determination device configured to determine a visibility index value on the basis of a picture image data of the picture taken by the picture image input device in light of a table representing a relationship between the picture image data and the visibility index value, a feedback controller configured to calculate an operation command for operating the ventilator on the basis of a feedback control value calculated by comparing the visibility index value with a target value of the visibility index value.