SCR (Selective Catalyctic Reduction) upstream temperature control method and device
A temperature control method and upstream technology, applied in the direction of electronic control of mufflers, exhaust devices, exhaust treatment devices, etc., can solve problems such as large temperature fluctuations, inability to complete adjustment quickly and stably, and temperature conduction lag
Active Publication Date: 2014-04-02
WEICHAI POWER CO LTD
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[0004] However, since there are other post-processing devices between the outlet end of the engine jet pipe and the SCR in the diesel engine, for example, DOC (Diesel Oxident Catalyst, oxidation catalyst), DPF (Diesel Particule Filter, diesel particulate filter), pipelines, etc. , leading to a delay in temperature conduction, therefore, direct closed-loop adjustment of the SCR upstream gas temperature results in large temperature fluctuations, which cannot be adjusted quickly and stably
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[0018] Since there are other post-processing devices between the outlet of the jet pipe of the diesel engine and the SCR, such as DOC, DPF, pipelines, etc., the temperature conduction lags behind. Therefore, the existing technology directly closes the loop to adjust the upstream gas temperature of the SCR, resulting in temperature fluctuations. The amount is large, and the adjustment cannot be completed quickly and stably.
[0019] To solve this problem, the embodiment of the present invention performs closed-loop adjustment on the gas temperature at the intake end of the first post-processing device after the outlet end of the engine exhaust pipe when the gas temperature upstream of the SCR needs to be adjusted, so that when the adjusted first When the gas temperature at the intake end of a post-processing device diffuses to the upstream of the SCR, the gas temperature upstream of the SCR can be adjusted accordingly. Since the first post-processing device after the outlet of t...
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The invention discloses an SCR (Selective Catalyctic Reduction) upstream temperature control method, in order to achieve the purpose of quickly and stably adjusting the SCR upstream gas temperature. The SCR upstream temperature control method comprises the following steps: when the SCR upstream gas temperature is lower than a first temperature, utilizing a rear jetting closed ring to adjust the gas temperature at a gas inlet end of a first post-processing device to a second temperature, wherein the second temperature is higher than the first temperature and the first post-processing device is the first post-processing device in the post-processing devices between an exhaust end of an engine exhaust pipe and the SCR; when the heat energy of the gas at the gas inlet end of the first post-processing device diffuses to the SCR upstream after temperature adjustment and causes the SCR upstream gas temperature to reach a third temperature, utilizing the rear jetting closed ring to adjust the gas temperature at the gas inlet end of the first post-processing device to a fourth temperature, wherein the fourth temperature is higher than the third temperature, the third temperature is higher than or equal to the first temperature, and the first temperature is higher than or equal to an SCR reaction threshold. Besides, the invention also discloses an SCR upstream temperature control device.
Description
technical field [0001] The invention relates to the field of electronically controlled diesel engines, in particular to an SCR upstream temperature control method and device. Background technique [0002] SCR (Selective Catalytic Reduction, Selective Catalytic Reduction) is a diesel engine after-treatment device used to eliminate NOx in exhaust gas. The reaction of SCR to eliminate NOx in the exhaust gas requires the temperature of the gas at the intake end to reach a certain threshold. When the gas temperature upstream of the SCR, that is, the temperature of the gas at the intake end of the SCR is low, it is necessary to adjust the gas temperature upstream of the SCR through the engine post injection (an injection after the main injection to increase the temperature of the exhaust gas), so that the SCR can work effectively . [0003] At present, the way to adjust the gas temperature upstream of the SCR is to directly adjust the gas temperature upstream of the SCR in a clo...
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IPC IPC(8): F01N9/00F01N3/20
CPCY02T10/24Y02T10/47Y02T10/12Y02T10/40
Inventor 刘兴义李大明秦涛王金平
Owner WEICHAI POWER CO LTD