Exhaust gas purification device for internal combustion engine

a technology of exhaust gas purification device and internal combustion engine, which is applied in the direction of exhaust treatment electric control, electrical control, machines/engines, etc., can solve the problems of engine oil dilution, difficult to evaporate injection fuel, and increase the rotation speed of the engin

Inactive Publication Date: 2008-12-04
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021]With the configuration, the oil dilution quantity can be derived accurately fr

Problems solved by technology

However, since the post-injection is performed during the expansion stroke, the injected fuel is hard to evaporate and tends to adhere to a wall surface of a cylinder.
The fuel adhering to the wall surface of the cylinder descends through a gap between a piston ring and the cylinder, causing a problem of engine oil dilution.
Furthermore, if the

Method used

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  • Exhaust gas purification device for internal combustion engine
  • Exhaust gas purification device for internal combustion engine
  • Exhaust gas purification device for internal combustion engine

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Embodiment Construction

[0035]Now, a first embodiment of the present invention will be described with reference to drawings. FIG. 1 is a system diagram showing an exhaust gas purification device of an internal combustion engine 1 according to the present embodiment. A diesel engine 2 shown in FIG. 1 serves as a motor. An airflow meter 3 for measuring a flow rate of an air on an intake side of the diesel engine 2, an engine rotation sensor 4 for measuring rotation speed NE of the diesel engine 2, and an accelerator position sensor 5 for measuring a position ACC of an accelerator achieved by a driver are provided as sensors for determining a state of the diesel engine 2. The diesel engine 2 has an injector including a fuel injection valve for injecting fuel. The injector is electrically connected to an ECU 10 (engine control unit) as a control unit. The ECU 10 manages an opening degree and timing of the fuel injection valve of the injector for injecting the fuel. The airflow meter 3, the engine rotation sens...

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Abstract

An exhaust gas purification device of a diesel engine having a DPF (diesel particulate filter) for collecting particulate matters such as soot and unburned components from exhaust gas of the diesel engine calculates an oil dilution quantity as a quantity of fuel diluting engine oil from a regeneration time of the DPF and an operation state. The exhaust gas purification device alleviates an increase in the oil dilution quantity by using a regeneration device that causes the oil dilution quantity less than the oil dilution quantity caused by another regeneration device when the oil dilution quantity exceeds a predetermined value. Thus, both of suppression of the oil dilution quantity and inhibition of deterioration of fuel consumption due to post-injection can be achieved.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is based on and incorporates herein by reference Japanese Patent Application No. 2007-144844 filed on May 31, 2007.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an exhaust gas purification device of an internal combustion engine having a diesel particulate filter (also referred to as a DPF) in an exhaust pipe for exhaust purification.[0004]2. Description of Related Art[0005]There is a conventional technology of a post-injection for sending additional fuel directly into a DPF in order to effectively combust particulate matters in the DPF by injecting the additional fuel in an expansion stroke after a main injection of an engine when a deposition quantity of the particulate matters in the DPF exceeds a predetermined value, for example, as described in Patent document 1 (Japanese Patent Application No. H08-42326) or Patent document 2 (Japanese Patent Application No. 2005-3077...

Claims

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Application Information

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IPC IPC(8): F01N9/00
CPCF01M1/18F01M2001/165F01N3/025F01N9/002F01N2430/06F02D41/029F02D41/402F02D41/405F02D2200/0812F02D2250/11Y02T10/44Y02T10/47Y02T10/40
Inventor KUBOSHIMA, TSUKASAYAHATA, SHIGETOSOGA, TSUTOMU
Owner DENSO CORP
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