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. 23, 2008
Filed:
Sep. 17, 2004
Mitsuhiro Nishina, Ageo, JP;
Toshikazu Katou, Ageo, JP;
Hiroyuki Kurita, Ageo, JP;
Nissan Diesel Motor Co., Ltd., Ageo-shi, JP;
Abstract
In an SCR apparatus mounted on a vehicle, the concentration of a reducing agent or a precursor thereof contained in an aqueous solution of the reducing agent or the precursor is accurately detected. In sensing the concentration, whether or not the urea water stored in a storage tank is in a stationary state is determined. Only it is in a stationary state, the concentration is detected. The determination of whether or not it is in a stationary state or not is preferably determined by determining whether the vehicle is stopped (S) and that the period of time TIM that has elapsed after the stoppage has reached a predetermined stationary time TIM(S). The deceleration DCL of the vehicle before stoppage thereof is detected, and the stationary time TIMis altered in accordance with the deceleration DCL (S).