Catalyst degradation detection device and method

A technology of degradation detection and catalyst, which is applied in the direction of exhaust device, muffler device, exhaust treatment device diagnostic device, etc. It can solve the problems of inability to rise, narrow combustion limit, and low release ability.

Inactive Publication Date: 2016-01-20
TOYOTA JIDOSHA KK
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, when natural gas is used as fuel, the stoichiometric point of the catalyst is on the rich side, and since the combustion limit on the rich side is narrow, the air-fuel ratio of the exhaust gas cannot be greatly changed to the rich side.
Also, for natural gas, more than 90% of the fuel is methane, and the ability of methane to release oxygen from the catalyst is low, so the oxygen concentration downstream of the catalyst cannot be increased similarly to the case where the air-fuel ratio of the exhaust gas is changed to the rich side
Therefore, in the case of using natural gas as fuel, it is not possible to accurately detect catalyst degradation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Catalyst degradation detection device and method
  • Catalyst degradation detection device and method
  • Catalyst degradation detection device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] figure 1 It is a diagram showing a schematic configuration of an internal combustion engine according to Embodiment 1 of the present invention. figure 1 The fuel of the internal combustion engine 1 shown can be the following liquid fuels: petroleum liquid fuels such as gasoline, mixed liquid fuels obtained by mixing alcohols such as ethanol, methanol, or oxygen-containing fuels such as MTBE with petroleum liquid fuels such as gasoline, etc. Wait. Furthermore, gaseous fuels such as compressed natural gas (CNG (Compressed Natural Gas)) may be used as fuel for the internal combustion engine 1 . In this embodiment, a case where a liquid fuel in which oxygen-containing fuel is mixed with gasoline and a case where CNG is used as a gaseous fuel is used as an example is exemplified.

[0038] Piston 3 is slidably arranged in cylinder 2 of internal combustion engine 1 . In the upper part of the cylinder 2, a combustion chamber 4 is defined by the upper wall and the inner wall ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

An object of the present invention is to provide a technique for accurately detecting deterioration of an exhaust purification catalyst used in an internal combustion engine capable of using gaseous fuel and liquid fuel. In the present invention, when only gaseous fuel is used which makes it difficult to release the oxygen stored in the exhaust purification catalyst even if the air-fuel ratio of the exhaust gas discharged from the internal combustion engine is changed to the rich side, the catalyst deterioration determination unit is based on Whether or not the exhaust purification catalyst has deteriorated is determined by one of the following changes: a change in the output of the oxygen concentration detection unit only on the lean side, or a change in the output of the oxygen concentration detection unit on the rich side and the lean side.

Description

technical field [0001] The invention relates to a catalyst degradation detection device and a catalyst degradation detection method. Background technique [0002] In the case of using the oxygen storage capacity (OSC) of the catalyst to detect the deterioration of a catalyst provided in the exhaust passage of an internal combustion engine using natural gas as fuel, there is an O 2 A situation where the sensor gets a false value due to unburned methane reaction. Therefore, a technique for detecting catalyst degradation by changing a determination reference value for catalyst degradation is disclosed (for example, refer to Patent Document 1). Accordingly, in Patent Document 1, it is intended to accurately detect catalyst degradation. [0003] Patent Document 1: Japanese Patent Application Laid-Open No. 11-159375 [0004] When detecting catalyst degradation using the oxygen storage capacity of the catalyst, the air-fuel ratio of the exhaust gas discharged from the internal c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F02D19/06F02D19/08
CPCF01N11/007F01N2550/02F01N2560/025F01N2560/14F01N2900/0416F01N2900/1402F01N2900/1624F02D19/0647F02D19/081F02D41/0025F02D41/0027F02D41/1441F02D19/0634F02D19/0692Y02T10/30Y02T10/40F01N3/10
Inventor 篠田祥尚
Owner TOYOTA JIDOSHA KK
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products