Double-nozzle urea injection amount control method and after-treatment control system
A technology of urea injection and control method, which is applied in the direction of electric control of exhaust treatment device, exhaust treatment, diagnostic device of exhaust treatment device, etc., which can solve the problems of inability to control urea accurately, and achieve the effect of reducing volume design
Active Publication Date: 2017-05-17
WEICHAI POWER CO LTD
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[0004] After adopting SCRF, the layout of the post-treatment system is usually to arrange the SCR after the SCRF, and install a urea nozzle before the SCRF. There is a single nozzle placed upstream of the SCRF, and it is impossible to achieve precise control of urea injection according to the different reaction mechanisms in the SCRF and SCR systems
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[0027] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.
[0028] According to the embodiment of the present invention, a dual-nozzle urea injection quantity control method and an engine aftertreatment control system are proposed, referring to figure 1 , the post-treatment control system includes a DOC system, an SCRF system, an SCR system and an ASC system arranged in sequence, and an upstream NO is arranged in front of the DOC system x sensor and DOC upstream temperature sensor, a first ...
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The invention relates to a double-nozzle urea injection amount control method. The double-nozzle urea injection amount control method is characterized in that the double nozzles include a first nozzle and a second nozzle which are correspondingly mounted at the front of an SCRF (Selective Catalyst Reduction on Filter) system and an SCR (Selective Catalyst Reduction) system, wherein the SCRF system performs an MAP-based open-loop control method based on the first nozzle at the front end; the SCR system performs a closed-loop control method based on the second nozzle at the front end. The invention also provides an after-treatment control system adopting the abovementioned control method. According to the control method, an ammonia sensor is added in front of SCR based on the SCRF hardware system, so that the actual conversion efficiency of the SCRF can be monitored in real time, and as a result, the SCRF volume-reduction design can be realized; the used control strategies enable accurate control of the urea required by the SCRF system and the SCR system, so that the emission consistency can be ensured.
Description
technical field [0001] The invention relates to the field of engines, in particular to the field of gas emission purification. Background technique [0002] With the increasingly stringent automobile emission regulations, after-treatment systems with SCR (Selective Catalyst Reduction, Selective Catalyst Reduction) have become the mainstream technology for reducing emission pollution. The method of reducing emission pollution by the post-treatment system with SCR is to spray urea into the SCR tank to reduce nitrogen oxides, thereby reducing emissions and meeting the requirements of emission regulations. [0003] On the basis of SCR, SCRF technology is further developed. SCRF refers to coating SCR catalyst on DPF (particulate matter trap), also known as SCR on Filter, SDPF, etc. Using SCRF technology can not only reduce the aftertreatment volume, but also have better light-off characteristics, which can improve the conversion efficiency of SCR. SCRF technology also faces the...
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Login to View More IPC IPC(8): F01N3/20F01N9/00F01N11/00
CPCF01N3/208F01N9/00F01N11/00F01N11/002F01N2560/021F01N2560/025F01N2560/026F01N2560/14F01N2610/02F01N2900/0412Y02T10/12Y02T10/40
Inventor 张军张振涛王晓华曹庆和张瑜
Owner WEICHAI POWER CO LTD