Title:
ENGINE EXHAUST EMISSION CONTROL DEVICE
Document Type and Number:
Japanese Patent JP2005054604
Kind Code:
A
Abstract:
To provide a rich spike control method for optimally reducing NOx in an NOx catalyst in a system having the NOx catalyst for purifying exhaust emission in a lean combustion state such as a cylinder injection engine.
An NOx sensor is installed on the downstream side of the NOx catalyst, and an output value from the NOx sensor is controlled by feedback to a specified value to optimize a rich spike control so as to suppress the exhaust emission of NOx, HC, and CO. Also, the deterioration of the NOx catalyst can be easily determined by determining the output value from the NOx sensor.
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Inventors:
AKASAKA NOBUHIRO
YOSHIDA YOSHIYUKI
YOSHIDA YOSHIYUKI
Application Number:
JP2003206164A
Publication Date:
March 03, 2005
Filing Date:
August 06, 2003
Export Citation:
Assignee:
HITACHI LTD
International Classes:
F02D45/00; B01D53/94; F01N3/08; F01N3/20; F01N3/24; F01N3/28; F02D41/04; (IPC1-7): F02D41/04; B01D53/94; F01N3/08; F01N3/20; F01N3/24; F01N3/28; F02D45/00
Attorney, Agent or Firm:
Yasuo Sakuta
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