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:
Jun. 29, 2021
Filed:
Feb. 08, 2018
N.e. Chemcat Corporation, Tokyo, JP;
National Agency for Automobile and Land Transport Technology, Tokyo, JP;
Toshinori Okajima, Tokyo, JP;
Makoto Nagata, Tokyo, JP;
Nobunori Okui, Tokyo, JP;
Kyohei Yamaguchi, Tokyo, JP;
N.E. CHEMCAT CORPORATION, Tokyo, JP;
Abstract
An exhaust gas purification device is capable of reducing the amount of NOx emissions generated at the time of cold start. An exhaust gas purification device includes a urea injection valve, a metal honeycomb, a temperature sensor, and an SCR catalyst in an exhaust passage. It is possible for an exhaust gas temperature of exhaust gas passing through the metal honeycomb to be increased by the metal honeycomb that is capable of being electrically heated by control executed by a control unit ECU. The exhaust gas temperature is detected by the temperature sensor. Based on a temperature-versus-ammonia adsorption amount profile stored in advance in a storage unit of the control unit ECU, ammonia is pre-adsorbed onto the metal honeycomb and the SCR catalyst, and the metal honeycomb is electrically heated at the time of cold start after the temperature detected by the temperature sensor becomes lower than 150° C.