Particulate Matter Remaining Amount Estimating Method for Particulate Filter and Particulate Filter Regenerating Method

Inactive Publication Date: 2007-11-08
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0033] The invention makes it possible to inhibit the filter regeneration control from being executed for too long. As a result, it is possible to suppress deterioration in fuel efficiency and exhaust gas emissions.
[0034] The meth

Problems solved by technology

Further, when the filter regeneration control is stopped prematurely, i.e., when the filter regeneration control is stopped while there is still PM on the filter, and the PM remaining amount at the time that the filter regeneratio

Method used

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  • Particulate Matter Remaining Amount Estimating Method for Particulate Filter and Particulate Filter Regenerating Method
  • Particulate Matter Remaining Amount Estimating Method for Particulate Filter and Particulate Filter Regenerating Method
  • Particulate Matter Remaining Amount Estimating Method for Particulate Filter and Particulate Filter Regenerating Method

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Example

[0068] Next, a second exemplary embodiment of the invention will be described. The general structure of an internal combustion engine and the intake and exhaust systems thereof according to the second exemplary embodiment is similar to that described in the first exemplary embodiment above, so a description thereof will be omitted.

[0069] Here, a method for regenerating a filter when the operating state of the internal combustion engine 1 has changed during filter regeneration control according to the second exemplary embodiment will be described.

[0070] When the operating state of the internal combustion engine 1 changes, that change may produce changes in the flow rate and oxygen concentration of the exhaust gas flowing into the filter 11, as well as in the temperature of the filter 11. Therefore, if the operating state of the internal combustion engine 1 changes during execution of the filter regeneration control, so too might the PM removal rate per unit time Rt.

[0071] If the P...

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Abstract

Every time a specified period of time is counted during execution of filter regeneration control, a PM remaining amount every time that the specified period of time passes is estimated by subtracting the product of the specified period of time, a PM removal rate per unit time, and a PM remaining amount at the point when the specified period of time started to be counted from the PM remaining amount at the point when the specified period of time started to be counted. As a result, the PM remaining amount during execution of filter regeneration control which oxidizes and removes particulate matter that has accumulated on a particulate filter is estimated with greater accuracy.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The invention relates to a method for estimating the amount of particulate matter remaining on a particulate filter, which is provided in an exhaust passage of an internal combustion engine and traps particulate matter contained in exhaust gas, during filter regeneration control which oxidizes and removes particulate matter that has accumulated on the particulate filter. The invention also relates to a method for regenerating a particulate filter. [0003] 2. Description of the Related Art [0004] In an internal combustion engine provided with a particulate filter (hereinafter simply referred to as “filter”) that traps particulate matter (hereinafter simply referred to as “PM”) in exhaust gas in an exhaust passage, filter regeneration control is performed which oxidizes and removes PM that has accumulated on the filter by raising the temperature of the filter. [0005] Further, JP(A) 2003-293733 discloses technology whic...

Claims

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Application Information

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IPC IPC(8): F01N3/023F01N9/00
CPCF01N3/023Y02T10/47F01N9/002F01N3/0253Y02T10/40
Inventor KOGO, TOMOYUKIHASHIZUME, TAKESHI
Owner TOYOTA JIDOSHA KK
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