Exhaust gas purifier

Abstract

An exhaust gas purifier in which regeneration control of a particulate filter can be carried out accurately by enhancing the temperature measurement accuracy of a temperature sensor. The exhaust gas purifier comprises a pair of dispersion plates having a large number of communicating holes disposed oppositely to the flow direction of an exhaust gas in a filter case which is provided in a position along an exhaust pipe, and a catalyst generation type particulate filter contained in a containing chamber defined by the dispersion plates. The filter case is provided with a temperature sensor for sensing the exhaust gas temperature in the containing chamber, and a detector of the temperature sensor is located at a position where a flow of the exhaust gas is formed.

Description

technical field [0001] The invention relates to an exhaust purification device. Background technique [0002] Particulates (Particulate Matter: Particulate Matter) discharged from diesel engines are mainly composed of coal composed of carbonaceous, SOF components (Soluble Organic Fraction: soluble organic fraction) composed of high-boiling hydrocarbon components, and further contain a small amount of sulfate ( As a countermeasure to reduce such particles, it is considered to equip a particle filter 6 in the exhaust pipe 4 through which the exhaust gas 3 from the diesel engine 1 passes, as shown in FIG. 1 . [0003] Here, in the illustrated example, the following case is illustrated, that is, in the muffler 5 of the exhaust pipe 4 through which the exhaust gas 3 discharged from the diesel engine 1 (internal combustion engine) of the automobile flows through the exhaust manifold 2, The filter case 7 that houses the catalyst regeneration type particulate filter 6 integrally su...

AI Technical Summary

Problems solved by technology

[0014] However, conventionally, when the forced regeneration of the particulate filter 6 is performed by such fuel addition, the filter case 7 is equipped with a temperature sensor so as to detect the internal temperature of the storage space 12, and the regeneration is carried out based on the detected temperature of the temperature sensor. Regeneration control, but when the temperature sensor is installed on the filter housing 7 on the way of the exhaust pipe 4, it is only considered to avoid interference with its surrounding structures and ensure the minimum height from the ground (the lowest part of the chassis mechanism and the road surface The gap between: Load Clearance), the actual situation is that the position of the detection element of the temperature sensor in the filter housing 7 is not particularly considered

[0015] Therefore, for example, as shown in FIG. 6, if the detection element 15 of the temperature sensor 14 is inserted into the position of the distribution plate 10 near the entry side in the storage space 12, the temperature between the communication holes 10a of the above-mentioned distribution plate 10 can be hidden. If it is arranged in the wall part, the detection element 15 of the temperature sensor 14 is not exposed to the flow of the exhaust gas 3, especially when the flow rate of the exhaust gas 3 is small, the temperature measurement accuracy is low, and the regeneration control of the particulate filter 6 cannot be accurately performed. danger

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