JP2016166583A - Clogging warning device for particle oxidizing catalyst - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clogging warning device for particle oxidizing catalyst that notifies an operator of an indication that particle oxidizing catalyst clogs up, to prevent clogging of the particle oxidizing catalyst and prevent melting of the particle oxidizing catalyst.SOLUTION: A clogging warning device 100 for particle oxidizing catalyst includes: a calculation unit 118 configured to calculate a low load operation integration period by regarding periods in which temperature of exhaust flowing into a particle oxidizing catalyst 112 is low as positive, and integrating the periods: and a warning unit 119 configured to warn an operator of clogging of the particle oxidizing catalyst 112 when the low load operation integration period exceeds a threshold value.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a clogging warning device for a particle oxidation catalyst.

  The particulate oxidation catalyst (POC) is installed in the middle of an exhaust pipe together with, for example, a diesel oxidation catalyst (DOC), and particulate matter (PM) contained in exhaust discharged from the diesel engine into the atmosphere through the exhaust pipe. ) And the particulate matter and nitrogen dioxide are reacted to oxidize and remove the particulate matter.

JP 2001-020794 A

  By the way, in a diesel particulate filter (DPF), clogging due to accumulation of particulate matter is actively eliminated by intentionally raising the temperature of exhaust gas by exhaust pipe injection or the like. In, clogging due to the accumulation of particulate matter is passively eliminated by the flow of high-temperature exhaust during high-load operation (for example, during high-speed running).

  Therefore, when high-load operation is not performed for a long period of time, high-temperature exhaust does not flow into the particle oxidation catalyst, so clogging due to accumulation of particulate matter is not eliminated, and the exhaust gas purification rate in the particle oxidation catalyst is high. There is a problem of lowering.

  In addition, if high-temperature exhaust gas flows into the particle oxidation catalyst when the high-load operation has not been performed for a long period of time and the amount of particulate matter deposited on the particle oxidation catalyst is very large, There is a problem that the particle oxidation catalyst is melted.

  Accordingly, an object of the present invention is to provide a particle oxidation catalyst clogging that notifies a driver or the like of signs that the particle oxidation catalyst is clogged to prevent the particle oxidation catalyst from being clogged in advance and prevent the particle oxidation catalyst from being melted. It is to provide a warning device.

  The present invention, which has been created to achieve this object, includes a calculation unit that calculates a low load operation integration period by adding a positive period when the temperature of the exhaust gas flowing into the particle oxidation catalyst is low, and a low load A particle oxidation catalyst clogging warning device comprising: a warning unit that warns of clogging of the particle oxidation catalyst when the operation integration period is equal to or greater than a threshold value.

  In addition to accumulating the period when the temperature of the exhaust gas flowing into the particle oxidation catalyst is low as a positive value, the calculation unit adds up the period when the temperature of the exhaust gas flowing into the particle oxidation catalyst is high as a negative value. Thus, it is preferable to calculate the low load operation integration period.

  According to the present invention, a clogging warning device for a particle oxidation catalyst that notifies a driver or the like of signs of clogging of the particle oxidation catalyst to prevent the particle oxidation catalyst from being clogged in advance and to prevent the particle oxidation catalyst from being damaged. Can be provided.

It is the schematic which shows the clogging warning apparatus for particle | grain oxidation catalysts which concern on this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, a particle oxidation catalyst clogging warning device 100 according to a preferred embodiment of the present invention is mounted on an automobile 102 on which an internal combustion engine 101 such as a diesel engine is mounted.

  The internal combustion engine 101 is connected to an intake pipe 103 and is connected to an intake manifold 104 that branches intake air introduced into the internal combustion engine 101 through the intake pipe 103 into each combustion chamber of the internal combustion engine 101, and an exhaust pipe 105. And an exhaust manifold 106 that joins exhaust discharged from the combustion chambers of the internal combustion engine 101 to the exhaust pipe 105.

  Since the intake manifold 104 and the exhaust manifold 106 are communicated with each other through an exhaust gas recirculation (EGR) pipe 107, the exhaust gas exhausted from the internal combustion engine 101 is circulated as the intake air introduced into the internal combustion engine 101 again. At this time, the exhaust gas is cooled through the exhaust gas recirculation cooler 108 installed in the exhaust gas recirculation pipe 107 and circulated as intake air.

  In the internal combustion engine 101, intake air is introduced into the internal combustion engine 101 through the intake pipe 103, and exhaust gas is discharged from the internal combustion engine 101 through the exhaust pipe 105 through a combustion stroke. At this time, the intake air introduced into the internal combustion engine 101 is purified through the intake air purification device 109 installed in the intake pipe 103 and exhausted to the atmosphere through the exhaust gas purification device 110 installed in the exhaust pipe 105. The exhaust is purified.

  The exhaust emission control device 110 includes a soluble organic (SOF) component in particulate matter contained in the exhaust gas discharged into the atmosphere through the exhaust pipe 105 and nitrogen monoxide in the exhaust gas discharged into the atmosphere through the exhaust pipe 105. The diesel oxidation catalyst 111 that oxidizes the catalyst and the particulate matter contained in the exhaust gas that is installed on the exhaust downstream side of the diesel oxidation catalyst 111 and exhausted into the atmosphere from the internal combustion engine 101 through the exhaust pipe 105 is collected. And a particulate oxidation catalyst 112 that oxidizes and removes particulate matter by reacting particulate matter with nitrogen dioxide, and the temperature of the particulate oxidation catalyst 112 between the diesel oxidation catalyst 111 and the particulate oxidation catalyst 112 ( That is, an exhaust gas temperature detector 113 for detecting the exhaust gas temperature at the inlet of the particle oxidation catalyst 112 is installed.

  In the automobile 102, since the supercharger 114 is installed between the intake pipe 103 and the exhaust pipe 105, the prime mover 115 of the supercharger 114 installed in the exhaust pipe 105 is discharged from the internal combustion engine 101. By being driven by exhaust gas, the compressor 116 of the supercharger 114 installed in the intake pipe 103 is driven, and the intake air introduced into the internal combustion engine 101 through the intake pipe 103 is supercharged.

  A particle oxidation catalyst clogging warning device 100 according to a preferred embodiment of the present invention is realized by a program, hardware, and the like, and is mounted on an internal combustion engine control device (ECU) 117. The calculation unit 118 calculates the low load operation integration period by adding the periods when the temperature of the exhaust gas flowing into the engine 112 is low as positive, and the particle oxidation catalyst 112 when the low load operation integration period is greater than or equal to the threshold value. A warning unit 119 for warning clogging.

  The calculation unit 118 determines that the temperature of the exhaust gas at the inlet of the particle oxidation catalyst 112 detected by the exhaust gas temperature detector 113 is low when the temperature of the exhaust gas is equal to or lower than the activation temperature of the particle oxidation catalyst 112 and detects the temperature by the exhaust gas temperature detector 113. The low load operation integration period is calculated by integrating the period in which the temperature of the exhaust gas at the inlet of the particle oxidation catalyst 112 is equal to or lower than the activation temperature of the particle oxidation catalyst 112 as positive.

  Here, since the low load operation integration period is the total of the period during which the particle oxidation catalyst 112 does not exhibit the exhaust purification function, it can be converted into the amount of particulate matter deposited on the particle oxidation catalyst 112.

  For example, when the low load operation integration period is long, it is considered that the amount of particulate matter accumulated in the particle oxidation catalyst 112 is large. When the low load operation integration period is short, the amount of particulate matter accumulation in the particle oxidation catalyst 112 is large. It is thought that there are few.

  That is, the relationship between the low load operation integration period and the amount of particulate matter deposited on the particle oxidation catalyst 112 is obtained in advance by experiments or the like, and the particles in the particle oxidation catalyst 112 are measured from the low load operation integration period based on the results of the experiment. It is possible to estimate the amount of deposits of particulate matter.

  Therefore, the period when the amount of particulate matter accumulated in the particle oxidation catalyst 112 reaches an allowable maximum value is set as a threshold, and the warning unit 119 passes the warning lamp 120 or the like when the low load operation integration period is equal to or greater than the threshold. By warning about clogging of the particle oxidation catalyst 112, it becomes possible to prompt the driver or the like to eliminate clogging of the particle oxidation catalyst 112 due to high-load operation.

  Therefore, by appropriately setting the threshold value, the driver is notified of signs that the particle oxidation catalyst 112 is clogged to prevent the particle oxidation catalyst 112 from being clogged in advance and prevent the particle oxidation catalyst 112 from being damaged. It becomes possible.

  In the present embodiment, the calculation unit 118 calculates the low load operation integration period by adding the periods when the temperature of the exhaust gas flowing into the particle oxidation catalyst 112 is low as a positive value. In addition to accumulating a period in which the temperature of the exhaust gas flowing into the particle oxidation catalyst 112 is low as a positive value, 118 is accumulated as a negative period in which the temperature of the exhaust gas flowing into the particle oxidation catalyst 112 is a high temperature. Then, the low load operation integration period may be calculated.

  As described above, in the former form, the low load operation integration period means the total period during which high-temperature exhaust gas does not flow into the particle oxidation catalyst 112, and this is the accumulation of particulate matter in the particle oxidation catalyst 112. Although the particulate matter accumulated on the particle oxidation catalyst 112 is removed during the period when the high-temperature exhaust gas flows into the particle oxidation catalyst 112, the amount of accumulation is originally reduced. Need to be subtracted.

  For this reason, in addition to integrating the period when the temperature of the exhaust gas flowing into the particle oxidation catalyst 112 is low as a positive, the period when the temperature of the exhaust gas flowing into the particle oxidation catalyst 112 is high is integrated as a negative. By calculating the low load operation integration period, it is possible to give an accurate warning in consideration of the accumulation of particulate matter at low temperatures and the removal of particulate matter at high temperatures.

100 Clogging Warning Device for Particle Oxidation Catalyst 101 Internal Combustion Engine 102 Car 103 Intake Pipe 104 Intake Manifold 105 Exhaust Pipe 106 Exhaust Manifold 107 Exhaust Recirculation Pipe 108 Exhaust Recirculation Cooler 109 Intake Purification Unit 110 Exhaust Purification Unit 111 Diesel Oxidation Catalyst 112 Particle oxidation catalyst 113 Exhaust temperature detector 114 Supercharger 115 Primer 116 Compressor 117 Internal combustion engine controller 118 Calculation unit 119 Warning unit 120 Warning light

Claims (2)

A calculation unit for calculating a low load operation integration period by integrating the period when the temperature of the exhaust gas flowing into the particle oxidation catalyst is low as a positive value;
A warning section that warns of clogging of the particle oxidation catalyst when the low load operation integration period is equal to or greater than a threshold;
A clogging warning device for a particle oxidation catalyst.   In addition to accumulating the period when the temperature of the exhaust gas flowing into the particle oxidation catalyst is low as a positive value, the calculation unit adds up the period when the temperature of the exhaust gas flowing into the particle oxidation catalyst is high as a negative value. The clogging warning device for a particle oxidation catalyst according to claim 1, wherein the low load operation integration period is calculated.

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