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

[0036]The above-described eleventh example aspect of the present invention has the decreasing device

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,

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

Examples

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Example

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 ...

Example

[0103]In the above-described first embodiment, the urea solution addition quantity is set based on the NOx concentration in the exhaust gas. Alternatively, the urea solution addition quantity may be set based on the NOx purification rate in the urea SCR 52 as in the second embodiment, for example. Alternatively, a device or a section for estimating ammonia adsorption quantity in the urea SCR 52 may be provided, and the urea solution addition quantity may be set based on the estimated adsorption quantity.

[0104]In the above-described second embodiment, the urea solution addition quantity is set based on the NOx purification rate in the urea SCR 52. Alternatively, for example, a device or a section for estimating the ammonia adsorption quantity in the urea SCR 52 may be provided, and the urea solution addition quantity may be set based on the estimated adsorption quantity. Alternatively, for example, as in the above-described first embodiment, the urea solution addition quantity may be...

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PUM

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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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