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Exhaust purification control device and exhaust purification system of internal combustion engine

Inactive Publication Date: 2010-05-20
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]It is an object of the present invention to provide an exhaust purification control device of an internal combustion engine and an exhaust purification system having the exhaust purification control device, wherein the exhaust purification control device performs purification control of nitrogen oxides with a purification device by operating an addition device adding a reducing agent into exhaust gas upstream of the purification device and is capable of suitably inhibiting accumulation of deposit in an exhaust passage due to the addition of the reducing agent, while inhibiting increase in the number of parts.

Problems solved by technology

Therefore, if the addition quantity of the reducing agent is decreased, there is a possibility that a purification rate of the nitrogen oxides lowers.
That is, under the situation where the accumulation quantity of the deposit is large, adsorption quantity of the reducing substance to the purification device is large.

Method used

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  • Exhaust purification control device and exhaust purification system of internal combustion engine
  • Exhaust purification control device and exhaust purification system of internal combustion engine
  • Exhaust purification control device and exhaust purification system of internal combustion engine

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first embodiment

[0046]Hereafter, an exhaust purification control device of an internal combustion engine according to a first embodiment of the present invention will be explained with reference to the drawings.

[0047]A diesel engine 10 is an internal combustion engine having a reciprocating engine structure. An air cleaner 14 is provided upstream of an intake passage 12 of the diesel engine 10. An intake temperature sensor 16 for sensing intake air temperature and an airflow meter 18 for sensing an intake air flow rate are provided to the air cleaner 14. A turbocharger 20 is provided downstream of the air cleaner 14. An air supercharged by the turbocharger 20 is cooled by an intercooler 22 and then supplied to a downstream side of the intake passage 12. The air is supplied to a combustion chamber 28 of the diesel engine 10 through a throttle valve 24, which adjusts a flow passage area of the intake passage 12, and an intake valve 26, which opens and closes communication between the combustion chamb...

second embodiment

[0095]Next, a second embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the first embodiment.

[0096]In the present embodiment, the addition quantity of the urea solution added by the urea solution addition valve 62 is calculated based on the NOx purification rate Rnox. The NOx purification rate Rnox is calculated based on the both sensing values of the upstream NOx sensor 56 and the downstream NOx sensor 60.

[0097]FIG. 8 shows a procedure of purification processing of the nitrogen oxides according to the present embodiment. The ECU 80 repeatedly performs the processing, for example, in a predetermined cycle. Processing in FIG. 8 corresponding to the processing in FIG. 7 is indicated with the same step number as in FIG. 7.

[0098]As shown in FIG. 8, in the present embodiment, as the execution condition of the decrease control of the urea solution addition quantity Qur in the case where the idling is not performed present...

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Abstract

If it is determined that accumulation quantity of deposit on an inner wall of an exhaust passage is equal to or larger than a predetermined value, addition quantity of urea solution from a urea solution addition valve is decreased. Thereafter, exhaust gas temperature is increased rapidly when request torque of a diesel engine increases. Thus, the deposit having accumulated on the inner wall of the exhaust passage is decomposed at once and is supplied to a urea SCR as ammonia.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is based on and incorporates herein by reference Japanese Patent Application No. 2008-294029 filed on Nov. 18, 2008.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an exhaust purification control device of an internal combustion engine and to an exhaust purification system having the exhaust purification control device, wherein the exhaust purification control device is applied to an exhaust purification device having a purification device provided in an exhaust passage of the internal combustion engine for purifying nitrogen oxides in exhaust gas and an addition device for adding a reducing agent into the exhaust gas upstream of the purification device and performs purification control of the nitrogen oxides with the purification device while adjusting addition quantity of the reducing agent based on operation of the addition device.[0004]2. Description of Related Art[0005]...

Claims

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Application Information

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IPC IPC(8): F01N9/00
CPCF01N3/106F01N13/009F01N2560/026F01N2560/06F01N2560/14F01N2610/02F01N2610/146F01N2900/1402F01N2900/1622F02D41/027F02D41/08F02D41/1446F02D2041/1433Y02T10/24F01N3/208F02D41/0245F02D41/405Y02T10/12Y02A50/20
Inventor FUJITA, TATSUYAMARUYAMA, MASATOSHI
Owner DENSO CORP
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