Title:
EXHAUST GAS PURIFICATION DEVICE OF INTERNAL-COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JPH05195748
Kind Code:
A
Abstract:
PURPOSE:To reduce the amount of deposition of exhaust particulates on a catalyst and decrease the service frequency of a heater by holding long the temp. at which the catalyst borne by a filter is activated, and suppress drop in the catalyzing action. CONSTITUTION:An exhaust gas purification device includes two filters 11, 13 for bearing catalyst which are installed in respective exhaust passages 7, 9 arranged in line and coupling an exhaust gas inlet 1a with an exhaust gas outlet 1b, a temp. sensor 23 to sense the exhaust temp. at the inlet to the filters 11, 13, and a valve 15 to open and close the two exhaust passages 7, 9. When the temp. sensed, which has been above the catalyst activation point, becomes below a certain level, a control unit 21 controls the valve 15 so as to close either of the passages 7, 9 for a certain period of time, and thereby the catalyst is kept warm.
Inventors:
IIYAMA AKIHIRO
Application Number:
JP1097192A
Publication Date:
August 03, 1993
Filing Date:
January 24, 1992
Export Citation:
Assignee:
NISSAN MOTOR
International Classes:
F01N3/02; F01N3/027; F01N3/031; F01N3/035; F01N3/20; F01N13/04; (IPC1-7): F01N3/02
Attorney, Agent or Firm:
Yasuo Miyoshi (4 outside)