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1. (WO2005040567) DEVICE AND METHOD FOR DISCRIMINATING LIQUID

Pub. No.:    WO/2005/040567    International Application No.:    PCT/JP2004/012938
Publication Date: Sat May 07 01:59:59 CEST 2005 International Filing Date: Tue Sep 07 01:59:59 CEST 2004
IPC: F01N 3/20
Applicants: NISSAN DIESEL MOTOR CO., LTD.
日産ディーゼル工業株式会社
NISHINA, Mitsuhiro
仁科 充広
KATOU, Toshikazu
加藤 寿一
KURITA, Hiroyuki
栗田 弘之
Inventors: NISHINA, Mitsuhiro
仁科 充広
KATOU, Toshikazu
加藤 寿一
KURITA, Hiroyuki
栗田 弘之
Title: DEVICE AND METHOD FOR DISCRIMINATING LIQUID
Abstract:
A concentration sensor for detecting a concentration of a liquid reducing agent through heat transfer characteristics between separate two points is provided in a storage tank for storing a liquid supplied to an NOx reduction catalyst. When the concentration read from the concentration sensor is 0 % or less, the liquid is discriminated to be water, that is, it is utilized that when water is converted to the concentration of a liquid reducing agent, it is 0 %, and it is also 0 % even when the concentration is reduced by convection. When the concentration is greater than a predetermined value, it is discriminated that no liquid is present, since it is considered that the output of the sensor is abnormal because of the absence of a liquid in the tank. On the other hand, when the concentration is greater than 0 % and less than a predetermined value, the liquid is discriminated to be the liquid reducing agent, provided that the concentration value may include an error.