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Filter failure detection device for internal combustion engine

A fault detection and filter technology, which is applied to internal combustion piston engines, exhaust devices, noise reduction devices, etc., can solve the problems of low fault detection accuracy and difficulty in detecting pressure differences, etc.

Inactive Publication Date: 2013-08-28
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a filter fails, it may be difficult to detect a change in pressure difference, so the accuracy of failure detection may decrease.

Method used

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  • Filter failure detection device for internal combustion engine
  • Filter failure detection device for internal combustion engine
  • Filter failure detection device for internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] figure 1 It is a figure which shows the outline structure of the filter failure detection apparatus of the internal combustion engine of an Example. In the present embodiment, the internal combustion engine 1 is a diesel engine, but may also be a gasoline engine. The exhaust passage 2 is connected to the internal combustion engine 1 . A filter 3 for trapping particulate matter (PM) in the exhaust gas is provided in the exhaust passage 2 .

[0057] In the exhaust passage 2 downstream of the filter 3 , a PM sensor 4 for detecting the amount of PM in the exhaust gas flowing out of the filter 3 is provided. The PM sensor 4 has a pair of electrodes, and utilizes a phenomenon that the resistance between the electrodes changes according to the amount of PM adhered (deposited) between the electrodes to output a signal corresponding to the amount of PM. From this signal, the amount of PM passing through the filter 3 per unit time can be detected. In addition, the amount of P...

Embodiment 2

[0078] In this embodiment, the ECU 10 determines that the filter 3 is malfunctioning when the PM amount on the downstream side of the filter 3 when the flow velocity of the exhaust gas is equal to or greater than the predetermined value A is equal to or greater than the threshold value B. Other devices are the same as those in Embodiment 1, so descriptions are omitted.

[0079] Figure 5 It is a graph showing the relationship between the flow velocity of the exhaust gas passing through the filter 3 , the PM amount on the downstream side of the filter 3 , and a predetermined value A and a threshold value B. The solid line indicates the case where the filter 3 is normal, and the dotted line indicates the case where the filter 3 fails. The predetermined value A is set to a value equal to or greater than the lower limit value of the flow velocity of the exhaust gas at which a sudden change point occurs when the filter 3 fails. The predetermined value A may be set as the exhaust ...

Embodiment 3

[0093] In this example, the PM amount downstream of the filter 3 when the flow velocity of the exhaust gas is lower than the predetermined value A is compared with the amount of PM downstream of the filter 3 when the flow velocity of the exhaust gas is greater than the predetermined value A. The amount of PM, to determine whether the filter 3 failure. In addition, the predetermined value A is the same value as in Example 2. Other devices are the same as those in Embodiment 1, so descriptions are omitted.

[0094] As described in Example 2, when the filter 3 fails, the PM amount on the downstream side of the filter 3 relative to the amount of change in the flow velocity of the exhaust gas when the flow velocity of the exhaust gas is equal to or greater than the predetermined value A changes become larger. On the other hand, even if the filter 3 fails, if the flow velocity of the exhaust gas is lower than the predetermined value A at a low level, the amount of PM on the downst...

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PUM

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Abstract

A filter failure detection device for an internal combustion engine more accurately detects a failure of a filter (3). The filter failure detection device for an internal combustion engine is provided with: the filter (3) provided in the exhaust path (2) of the internal combustion engine (1) and collecting substances contained in the exhaust gas; a substance amount detection section (4) provided in the exhaust path (2) at a position downstream of the filter (3) and detecting the amount of the substances in the exhaust gas; a flow speed detection section (10) for detecting or estimating the flow speed of the exhaust gas passing through the filter (3); and a determination section (10) for determining that the filter (3) has a failure when the ratio of the amount of change in the amount of the substances to the amount of change in the flow speed of the exhaust gas increases as the flow speed of the exhaust gas passing through the filter (3) increases.

Description

technical field [0001] The invention relates to a filter fault detection device of an internal combustion engine. Background technique [0002] There is known a technique for detecting a failure of a filter, which is installed in an exhaust passage of an internal combustion engine and traps exhaust gas, based on a pressure difference between a position upstream of the filter and a position downstream of the filter. Particulate matter (PM) in (for example, refer to Patent Document 1.). However, when a filter fails, it may be difficult to detect a change in pressure difference, so the accuracy of failure detection may decrease. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2007-327392 [0006] Patent Document 2: Japanese Patent Laid-Open No. 2008-101606 Contents of the invention [0007] The problem to be solved by the invention [0008] The present invention has been made in view of the above-mentione...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/02
CPCF01N3/021F01N11/00F01N2550/04F01N2560/05F01N2900/0412F01N2900/0416F01N2900/0418F01N2900/0601F01N2900/08F01N2900/1411Y02T10/12Y02T10/40
Inventor 柴田大介泽田裕木所彻萩本大河高冈一哉
Owner TOYOTA JIDOSHA KK
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