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Vehicle control device

A vehicle control device and carrier technology, which is applied in the direction of exhaust devices, noise reduction devices, exhaust treatment device diagnostic devices, etc., and can solve the problems of unrecorded and maintained cushions

Inactive Publication Date: 2012-09-12
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the above-mentioned Patent Documents 1 to 3, there is no description for controlling the state of the holding pad in the EHC.

Method used

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Examples

Experimental program
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Effect test

no. 1 Embodiment approach ］

[0081] In the first embodiment, prohibition / permission of energization to the EHC 13 is determined by estimating the insulation resistance of the holding mat 13 b based on the temperature of the holding mat 13 b (hereinafter, appropriately referred to as “holding mat temperature”). This is because the insulation resistance of the holding mat layer 13b tends to change according to the temperature of the holding mat layer. Specifically, in the first embodiment, the ECU 70 determines that the insulation resistance of the holding pad 13b has fallen below a predetermined value when the holding pad temperature is higher than a predetermined temperature, and prohibits energization of the EHC 13 . In this case, ECU 70 does not perform catalyst warm-up by energization even if the EHC energization request is issued.

[0082] refer to Figure 4 and Figure 5 , the reason for controlling the energization of the EHC 13 based on maintaining the pad temperature as described above will be s...

no. 2 Embodiment approach ］

[0120] Next, a second embodiment will be described. In the second embodiment, based on the amount of water absorbed by the holding mat 13b (in other words, the amount corresponding to the exhaust gas condensate held by the holding mat 13b, hereinafter referred to as "mat water absorption" as appropriate.) The point of estimating the insulation resistance of the holding pad layer 13b is different from that of the first embodiment. That is, the second embodiment differs from the first embodiment in that instead of maintaining the mat temperature, prohibition / permission of energization to the EHC 13 is determined based on the mat water absorption amount. Specifically, in the second embodiment, the ECU 70 determines that the insulation resistance of the holding mat 13 b has fallen below a predetermined value when the amount of water absorbed by the mat is greater than or equal to a predetermined value, and prohibits energization of the EHC 13 .

[0121] The reason for controlling...

no. 3 Embodiment approach ］

[0181] Next, a third embodiment will be described. In the third embodiment, in terms of estimating the insulation resistance of the holding pad layer 13b based on the amount of carbon deposited on the holding pad layer 13b (hereinafter, appropriately referred to as "carbon deposition amount"), it is different from the first and the first The second embodiment is different. That is, the third embodiment differs from the first and second embodiments in that the prohibition / permission of energization to the EHC 13 is determined based on the carbon deposition amount instead of maintaining the mat temperature and the mat water absorption amount. Specifically, in the third embodiment, the ECU 70 determines that the insulation resistance of the holding pad layer 13 b has fallen below a predetermined value when the amount of carbon deposition is greater than or equal to a predetermined value, and prohibits energization of the EHC 13 .

[0182] The reason for controlling based on the ...

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PUM

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Abstract

Disclosed is a vehicle control device for application in a vehicle having an internal combustion engine and an electrically heated catalyst that can be warmed by the application of an electric current. The catalyst is equipped with a catalyst support for supporting the catalyst, and a support holding unit - which has electrically insulative properties - for holding the catalyst support. The device is provided with an insulation resistance determination means for determining whether or not the insulation resistance of the support holding unit has dropped to or below a prescribed level, and an electric current suppression means for suppressing application of an electric current to the electrically heated catalyst when the insulation resistance is determined to have dropped to or below the prescribed level. As a result, it is possible to appropriately suppress application of an electric current to the electrically heated catalyst based on the insulative properties of the support holding unit, and to prevent electric leakage of the electrically heated catalyst.

Description

technical field [0001] The present invention relates to a vehicle control device including an electrically heated catalyst in an exhaust passage. Background technique [0002] Conventionally, there is known a technique for purifying exhaust gas using an electrically heated catalyst (hereinafter, appropriately referred to as “EHC (Electrically Heated Catalyst)”) arranged in an exhaust passage. For example, Patent Document 1 describes an EHC in which an annular gasket member serving as an electrical insulating material and having cushioning properties is attached between the outer peripheral surface of a catalyst carrier and the inner peripheral surface of a metal case. In addition, Patent Document 2 describes a technique for estimating the temperature of a gasket layer holding a catalyst. [0003] Other techniques related to the present invention are described in Patent Document 3, for example. Patent Document 3 describes estimating the possibility of electric leakage of th...

Claims

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Application Information

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IPC IPC(8): F01N3/24F01N3/20F01N3/28
CPCF01N3/2013F01N3/2842F01N11/00F01N2550/22F01N2900/16F01N2900/1602F01N2900/1628Y02T10/12Y02T10/40Y02A50/20
Inventor 吉冈卫熊谷典昭高木直也
Owner TOYOTA JIDOSHA KK
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