| 摘要 |
<P>PROBLEM TO BE SOLVED: To realize suitable operation of an exhaust emission control device by performing a suitable corresponding treatment based on basic information detecting abnormality in concentration in the exhaust emission control device for reducing and removing nitrogen oxide (NOx) emitted from a diesel engine, a gasoline engine, etc. installed in a moving vehicle by using a reducing agent. <P>SOLUTION: The exhaust emission control device supplies urea water in a storage tank 20 to an exhaust gas upstream of a reducing catalyst 3 disposed in an exhaust system of the engine 1. A concentration detector 60 is disposed in the storage tank 20 to detect the concentration of the urea water, which is used as the basic information for a suitable NOx reducing action. A heat exchanger for heating and/or cooling the reducing agent in the storage tank 20 is disposed on a periphery of the concentration detector. The exhaust emission control device can suitably be operated by performing the suitable corresponding treatment based on the basic information detecting the concentration fault by knowing the reducing agent concentration in the storage tank. As a cold season countermeasure, the concentration of the reducing agent is detected certainly, and the reducing agent can be supplied stably. Further, as an intense heat season countermeasure, generation of an ammonia from the storage tank is prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
