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Exhaust emission control system of internal combustion engine and exhaust emission control method

An emission control system and emission control technology, applied to internal combustion piston engines, electronic control of exhaust treatment devices, separation methods, etc., can solve the problem of expensive urea aqueous solution concentration sensors

Inactive Publication Date: 2012-01-11
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the urea aqueous solution concentration sensor is expensive, and it is desired to use other inexpensive methods to detect abnormalities in urea aqueous solution

Method used

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  • Exhaust emission control system of internal combustion engine and exhaust emission control method
  • Exhaust emission control system of internal combustion engine and exhaust emission control method
  • Exhaust emission control system of internal combustion engine and exhaust emission control method

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Embodiment Construction

[0030] Exemplary embodiments of the present invention are described in more detail below with reference to the accompanying drawings.

[0031] figure 1 is a general view of a compression ignition internal combustion engine. figure 1 The engine includes an engine body 1 , a combustion chamber 2 of each cylinder, an electronically controlled fuel injection valve 3 for injecting fuel into each combustion chamber 2 , an intake manifold 4 and an exhaust manifold 5 . The intake manifold 4 is connected to the outlet of the compressor 7a of the exhaust turbocharger 7 via the intake pipe 6, and the inlet of the compressor 7a is connected to the air cleaner 9 via the air flow meter 8 for detecting the amount of intake air . A throttle valve 10 adapted to be driven by a stepping motor is provided in the intake pipe 6 , and a cooling device 11 for cooling intake air flowing in the intake pipe 6 is provided around the intake pipe 6 . exist figure 1 In the illustrated embodiment, engine...

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Abstract

In an exhaust emission control system of an internal combustion engine, a NOx selective reduction catalyst (15) is disposed in an engine exhaust passage, and an aqueous solution of urea stored in an aqueous-urea tank (20) is supplied to the NOx selective reduction catalyst (15) so as to selectively reduce NOx. A NOx sensor (41) is provided in the engine exhaust passage downstream of the NOx selective reduction catalyst (15) for detecting the NOx conversion efficiency of the NOx selective reduction catalyst (15), and the concentration of aqueous urea in the aqueous-urea tank (20) is estimated from the detected NOx conversion efficiency. The exhaust emission control system and method make it possible to detect the concentration of aqueous urea at reduced cost.

Description

technical field [0001] The invention relates to an exhaust emission control system of an internal combustion engine and an exhaust emission control method thereof. Background technique [0002] In which a NOx selective reduction catalyst is disposed in the engine exhaust passage and the urea aqueous solution stored in the urea aqueous solution tank is supplied to the NOx selective reduction catalyst so that ammonia generated from the urea aqueous solution selectively reduces NOx contained in the exhaust gas In the internal combustion engine exhaust emission control system, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2005-83223 (JP-A-2005-83223), it is known in the prior art to arrange an aqueous urea solution in a urea aqueous solution tank The concentration sensor is used to detect the abnormality of the urea aqueous solution. [0003] However, the urea aqueous solution concentration sensor is expensive, and it is desired to detect abnormalities...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N11/00
CPCF01N2610/1453F01N13/02B01D2255/50Y02T10/24B01D2255/20707F01N3/2066B01D2255/20738F01N2900/1806B01D2255/20723F01N2013/026B01D53/90B01D53/9418F01N2900/1621F01N2560/026B01D53/9495B01D53/9477B01D2251/2062B01D2255/1021F01N2560/06F01N11/00F01N13/009F01N13/0097F01N2550/05F01N2610/02F01N2900/1814Y02T10/12Y02T10/40
Inventor 利冈俊祐小田富久田内丰浅浦慎也中村好孝
Owner TOYOTA JIDOSHA KK