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Exhaust purification device of internal combustion engine, and control method thereof

Inactive Publication Date: 2009-05-28
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]It is an object of the invention to provide a technology capable of more accurately determining the presence / absence of the clogging of a particulate filter in an exhaust purification device of the internal combustion engine.

Problems solved by technology

Therefore, the differential pressure between the upstream side and the downstream side of the particulate filter changes, so that there is a possibility of error in the determination regarding the clogging of the particulate filter.

Method used

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  • Exhaust purification device of internal combustion engine, and control method thereof
  • Exhaust purification device of internal combustion engine, and control method thereof
  • Exhaust purification device of internal combustion engine, and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

i. First Embodiment

[0037]An internal combustion engine 1 shown in FIG. 1 is a water-cooled four-stroke diesel engine that has four cylinders 2.

[0038]An intake pipe 3 and an exhaust pipe 4 are connected to the internal combustion engine 1. An intermediate portion of the intake pipe 3 is provided with a compressor housing 5a of a turbocharger 5 that acts using energy of exhaust as a drive source. The intake pipe 3 upstream of the compressor housing 5a is provided with a first throttle 6 that adjusts the amount of flow of intake flowing in the intake pipe 3. The first throttle 6 is opened and closed by an electric actuator. The intake pipe 3 upstream of the first throttle 6 is provided with an air flow meter 7 that outputs a signal that is in accordance with the amount of flow of intake flowing in the intake pipe 3. The intake air amount of the internal combustion engine 1 is measured by the air flow meter 7. In this embodiment, the air flow meter 7 corresponds to intake air amount det...

second embodiment

ii. Second Embodiment

[0070]In this embodiment, the EGR gas amount supplied into the cylinders 2 is kept constant by supplying an amount of high-pressure EGR gas that corresponds to the amount of decrease of the low-pressure EGR gas.

[0071]It is to be noted herein that when the degree of opening of the low-pressure EGR valve 32 is changed, the ER gas amount supplied into the cylinders 2 changes. For example, when the low-pressure EGR valve 32 is controlled to the fully closed state in first embodiment, the supply of the low-pressure EGR gas into the cylinders 2 discontinues. Therefore, there is possibility of lack of the EGR gas in the cylinders.

[0072]In second embodiment, on the other hand, the degree of opening of the high-pressure EGR valve 42 is controlled so that the EGR gas amount supplied into the cylinders 2 is constant. In reality, the degree of opening of the high-pressure EGR valve 42 is controlled so that the intake air amount is constant. What is taken into the cylinders ...

third embodiment

iii. Third Embodiment

[0078]In this embodiment, while the degree of opening of the low-pressure EGR valve 32 is changing with the elapse of time, the low-pressure EGR gas amount at the current degree of opening is estimated. By adding the current intake air amount measured by the air flow meter 7 to the estimated value, the amount of flow of exhaust passing through the filter 10 with the current degree of opening is calculated. Specifically, the sum of the low-pressure EGR gas amount and the fresh air amount is equal to the amount of flow of exhaust passing through the filter 10. Therefore, even while the degree of opening of the low-pressure EGR valve 32 is changing with the elapse of time, the amount of flow of exhaust passing through the filter 10 with the current degree of opening can be calculated by estimating the low-pressure EGR gas amount that corresponds to the degree of opening and detecting the fresh air amount provided at the time of that degree of opening. Incidentally,...

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Abstract

An exhaust purification device includes a particulate filter (10), an air flow meter (7) that detects the amount of fresh air flowing in an intake passageway (3), and an EGR device (30) that supplies gas to a site in the intake passageway (3) between the air flow meter (7) and the particulate filter (10). The exhaust purification device detects the amount of flow of exhaust passing through the particulate filter on the basis of the amount of gas supplied by the EGR device (30), and the intake air amount detected by the air flow meter (S108), and detects the differential pressure between the upstream side and the downstream side of the particulate filter, and determines whether the particulate filter is clogged on the basis of the amount of flow and the differential pressure of exhaust (S110).

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention relates to an exhaust purification device of an internal combustion engine and a control method thereof.[0003]2. Description of the Related Art[0004]In an exhaust purification device of an internal combustion engine equipped with an EGR (exhaust gas recirculation) passageway that connects an exhaust passageway downstream of a particulate filter and an intake passageway downstream of an air flow meter, a technology that determines the presence / absence of the clogging of the particulate filter on the basis of the differential pressure between the upstream side and the downstream side of the particulate filter is disclosed in Japanese Patent Application Publication No. JP-A-2005-69207.[0005]However, if the degree of opening of an EGR valve provided in an EGR passageway is changed, the amount of exhaust that passes through the particulate filter changes. Therefore, the differential pressure between the upstrea...

Claims

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Application Information

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IPC IPC(8): F01N9/00
CPCF01N9/002F02D41/0052F02D41/0055F02D2200/0812Y02T10/47F02M25/0709F02M25/0718Y02T10/121F02M25/0707F02M26/05F02M26/06F02M26/15Y02T10/40
Inventor ONO, TOMOYUKI
Owner TOYOTA JIDOSHA KK
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