Integrated device, exhaust-gas aftertreatment system, and control method

Abstract

An integrated device comprises a pump assembly and a nozzle assembly. The pump assembly has an accommodation compartment for accommodating the nozzle assembly, a pump assembly housing, and a pump. The pump assembly housing has an inlet passage and an outlet passage. The outlet passage is in communication with the nozzle assembly. The pump assembly comprises an enclosure; a motor coil for driving the pump; a magnetic body; a first gear assembly; and a second gear assembly. The first gear assembly and the second gear assembly mesh with each other. The nozzle assembly comprises a nozzle assembly housing, nozzle and a nozzle coil for driving the nozzle. The integrated device includes a pressure sensor that does not have an independent housing. The enclosure serves as a housing of the pressure sensor. The integrated device has a simple and compact structure, and facilitates realization of downsizing of the device. Also disclosed are an exhaust-gas aftertreatment system and a control method.

Description

[0001]This application is a request for the priority of the Chinese patent application with the filing date of Jun. 6, 2016, application number of 201610392925.4, and title of invention of “Integrated Device, Exhaust-Gas Aftertreatment System, and Control Method”, the whole content of which is incorporated in this application by reference.TECHNICAL FIELD[0002]The present invention relates to an integrated device, an exhaust-gas aftertreatment system, and a control method, belonging to the technical field of engine exhaust-gas aftertreatment.BACKGROUND ART[0003]With the increasingly stringent emission standards of vehicles using internal combustion engines, in order to reduce the emission of harmful substances such as nitrogen oxides, selective catalytic reduction (SCR) is commonly used as the aftertreatment technology in the industry, and urea solutions are injected into the exhaust gas upstream of the SCR. A urea solution is hydrolyzed and pyrolyzed to produce ammonia and reacts wi...

AI Technical Summary

Benefits of technology

[0047]Compared with the prior art, an integrated device comprising a pump and a nozzle according to the present invention integrates the pump and the nozzle very well, has a simple and compact structure, and greatly facilitates installations by customers. On the basis of integrating a urea pump and a urea nozzle in the integrated device, due to the improvement of control precision, the proportion of the urea injected into exhaust gas to nitrogen oxides can be made suitable, thus reducing the crystallization risk caused by excessive urea injection. In addition, the pressure sensor has no independent housing and is realized by an enclosure. Without affecting the function of the sensor, the size of the sensor can be reduced, and the downsizing of the integrated device can be realized.

Problems solved by technology

In addition, a conventional urea injection system comprises a large number of components, and consequently is difficult to install and high-cost.

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