Misfire detecting device for internal combustion engine

A detection device, internal combustion engine technology, applied in internal combustion engine testing, exhaust devices, noise reduction devices, etc., can solve problems such as exhaust purification device fires

Pending Publication Date: 2019-10-22
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in this conventional device, after the elapse of the evaluation period, the evaluation values ​​calculated during the evaluation period are totaled, and when the total value is equal to or greater than a threshold value, it is determined that a misfire of a level at which the function of the exhaust purification device is impaired has occurred.

Method used

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Embodiment Construction

[0030] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, when referring to the number, amount, amount, range, etc. of each element in the embodiments shown below, the present invention does not limit the number, except in cases where it is specifically stated or when it is clearly determined to be the number in principle. in the number mentioned. In addition, configurations, procedures, and the like described in the embodiments described below are not necessarily essential in the present invention, except for cases where they are particularly clearly stated or clearly determined in principle.

[0031] 1. Description of system structure

[0032] A misfire detection device according to an embodiment of the present invention is a device that detects misfire of an internal combustion engine mounted on a vehicle. Specifically, the internal combustion engine is a spark ignition type engine having a plurality of cylinders. ...

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PUM

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Abstract

The invention provides a misfire detecting device for an internal combustion engine that is able to increase an accuracy in detecting the occurrence of misfire having the level at which the exhaust purifying function of the filter is impaired. The occurrence of the misfire having a level at which exhaust purifying function of a catalyst is impaired (OT-level misfire) is detected. Upon the detection of the OT-level misfire, basic OT risk from the misfire is multiplied by a correction coefficient corresponding to the accumulated PM amount on the catalyst. The basic OT risk from the misfire is abasic value of OT risk from the misfire which is set based on the operating condition of the engine. The correction coefficient is set to a smaller value as the accumulated PM amount increases. Therefore, the OT risk from the misfire after the multiplication decreases as the accumulated PM amount increases. Thus, it is possible to increase the accuracy in detecting the occurrence of the OT-level misfire caused by the combustion of the PM from the misfire.

Description

technical field [0001] The invention relates to a misfire detection device for an internal combustion engine. Background technique [0002] Japanese Patent Application Laid-Open No. 5-202799 discloses a misfire detection device that evaluates damage to an exhaust purification device caused by the occurrence of misfire based on the operating state of an internal combustion engine. This conventional device calculates an evaluation value when a misfire occurs during the evaluation period. This evaluation value is calculated in association with the operating state when misfire occurs. In addition, this conventional device sums up the evaluation values ​​calculated during the evaluation period after the evaluation period elapses, and when the total value is equal to or greater than a threshold value, it is determined that a misfire of a level at which the function of the exhaust purification device is impaired has occurred. [0003] prior art literature [0004] patent documen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B77/08F01N11/00F01N3/021
CPCF02B77/08F01N11/00F01N3/021F01N2900/1606F02D2200/1015F02D41/029F02D2200/0812F02D41/1498F02D41/22F02D2041/228F02D41/2403G01M15/11
Inventor 菱田琢也加藤寿一今井勇人
Owner TOYOTA JIDOSHA KK
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