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Vehicle control device

A vehicle control device and carrier technology, which can be applied to exhaust devices, mufflers, diagnostic devices of exhaust gas treatment devices, etc., and can solve problems such as undocumented retaining cushions and the like

Inactive Publication Date: 2014-05-21
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

A vehicle control device applied to a vehicle including an internal combustion engine and an electrically heated catalyst which is warmed by applying a current, and includes a catalyst carrier supporting a catalyst and a carrier retention unit that retains the catalyst carrier and has an electrical insulation property. The vehicle control device includes an insulation resistance determination unit which determines whether or not an insulation resistance of the carrier retention unit decreases to a value equal to or lower than a predetermined value, and an applying current prohibition unit which prohibits applying the current to the electrically heated catalyst when the insulation resistance determination unit determines that the insulation resistance decreases to the value equal to or lower than the predetermined value. Therefore, it is possible to appropriately control of applying the current to the electrically heated catalyst based on the insulation property of the carrier retention unit, and hence it becomes possible to appropriately prevent an electrical leak 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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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/24F01N3/20F01N3/28
CPCF01N11/00F01N3/2013F01N2550/22Y02T10/26F01N3/2842Y02T10/47F01N2900/16F01N2900/1628F01N2900/1602Y02T10/12Y02T10/40Y02A50/20
Inventor 吉冈卫熊谷典昭高木直也
Owner TOYOTA JIDOSHA KK
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