Exhaust gas purifier

• US 20070017371A1
• Filed: 06/02/2004
• Published: 01/25/2007
• Est. Priority Date: 06/03/2003
• Status: Active Grant

• Current Assignee: HINO Motors Limited (Toyota Motor Corporation)
• Original Assignee: HINO Motors Limited (Toyota Motor Corporation)
• Inventors: Takenaka, Yoshihide, Furukawa, Takatoshi, Machida, Koichi
• Granted Patent: US 7,497,889 B2
• Time in Patent Office: Days
• US Class Current: 96/69
• CPC Class Codes: B03C 2201/30 for use in or with vehicles
• CPC Class Codes: B03C 3/363 located before the filter
• CPC Class Codes: B03C 3/366 located in the filter, e.g. special shape of the electrodes
• CPC Class Codes: B03C 3/49 tubular B03C3/455 takes precedence
• CPC Class Codes: F01N 3/01 by means of electric or electrostatic separators
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y10S 55/10 Residue burned
• CPC Class Codes: Y10S 55/30 Exhaust treatment
• CPC Class Codes: Y10S 55/38 Tubular collector electrode

Abstract

Arranged within a cylindrical housing 1 are capturing cells 2 each including a cylindrical outer electrode 7 capable of capturing particulates and an inner electrode 6 inserted into the outer electrode and lined at its outer surface with a dielectric 5. Exhaust divergent means 3 is arrange on an end of the housing 1 so as to guide exhaust G to interiors in the respective capturing cells 2; exhaust convergence means 4 is arranged on the other end of the housing 1 so as to communicate with a gap 14 between an inner surface of the housing and outer surfaces of the outer electrodes 7 in the respective cells 2. The inner and outer electrodes 6 and 7 are connected to an electric discharge controller 15. Thus, provided is an exhaust emission control device with high removal efficiency of particulates and with easiness in maintenance.

Claims

1. An exhaust emission control device comprising a plurality of capturing cells each including a cylindrical outer electrode constituted by an electrically conductive filter capable of capturing particulates, a rod-like inner electrode inserted into the outer electrode and a dielectric for lining an outer surface of the inner electrode, a cylindrical housing within which said capturing cells are arranged in parallel with each other, exhaust divergence means on one end of the housing and in communication with interiors of the outer electrodes in the respective capturing cells and exhaust convergence means on the other end of the housing and in communication with a gap between an inner surface of the housing and outer surfaces of the respective capturing cells, voltage necessary for generation of electric discharge being applicable across the inner and outer electrodes.

2. An exhaust emission control device comprising a plurality of capturing cells each including a cylindrical inner electrode constituted by an electrically conductive filter capable of capturing particulates, a cylindrical outer electrode surrounding said inner electrode and a dielectric for lining an inner surface of the outer electrode, a cylindrical housing within which said capturing cells are arranged in parallel with each other, exhaust divergence means on one end of the housing and in communication with a gap between an inner surface of the dielectric and an outer surface of the inner electrode in each of the capturing cells, exhaust convergence means on the other end of the housing and in communication with an interior of the inner electrode in each of the capturing cells, voltage necessary for generation of electric discharge being applicable across the inner and outer electrodes.

3. An exhaust emission control device comprising a plurality of capturing cells each including a cylindrical inner electrode constituted by an electrically conductive filter capable of capturing particulates, a cylindrical dielectric surrounding said inner electrode and a cylindrical outer electrode constituted by an electrically conductive filter capable of capturing particulates and surrounding said dielectric, a cylindrical housing within which said capturing cells are arranged in parallel with each other, exhaust divergence means on one end of the housing and in communication with a gap between an inner surface of the dielectric and an outer surface of the inner electrode in each of the capturing cells and a gap between an inner surface of the outer electrode and an outer surface of the dielectric in each of the capturing cells and exhaust convergence means on the other end of the housing and in communication with an interior of the inner electrode in each of the capturing cells, voltage necessary for generation of electric discharge being applicable across the inner and outer electrodes.