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EXHAUST EMISSION CONTROL DEVICE

  • US 20090313979A1
  • Filed: 02/21/2008
  • Published: 12/24/2009
  • Est. Priority Date: 02/23/2007
  • Status: Active Grant
First Claim
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1. An exhaust emission control device comprising a particulate filter incorporated in an exhaust pipe for capturing particulates in exhaust gas, selective reduction catalyst arranged in parallel with and downstream of said particulate filter for selectively reacting NOx with ammonia even in the presence of oxygen, an S-shaped communication passage for introduction of the exhaust gas from a rear end of the particulate filter to a front end of the adjacent selective reduction catalyst in a forward fold-back manner and urea water addition means arranged midway of said communication passage for addition of urea water, wherein an upstream portion of said communication passage comprises a gas gathering chamber for encompassing the rear end of the particulate filter to gather the exhaust gas discharged from the rear end of the particulate filter through substantially perpendicular turnabout of the exhaust gas and a mixing pipe for extracting forward the exhaust gas gathered by the gathering chamber, openings formed in circumferentially spaced positions on a rear end of said mixing pipe for introduction of the exhaust gas, a downstream end of said gathering chamber being connected to the rear end of said mixing pipe such that said respective openings are encased and the rear end of said mixing pipe is closed.

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