Urea crystallization control method and device, a storage medium and electronic device
A control method and crystallization technology, applied in the field of vehicles, can solve problems such as blockage of urea flow channels, and improve the treatment effect and the effect of
Active Publication Date: 2020-02-07
WEICHAI POWER CO LTD
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Problems solved by technology
[0005] However, the methods in the prior art cannot avoid the occurrence of a series of problems caused by the accumulation of urea crystals, such as blockage of urea flow channels, etc.
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[0046]In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in this application. Obviously, the described embodiments are part of the embodiments of this application , but not all examples. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0047] The basic principle of SCR technology is to inject fuel or add other reducing agents to the exhaust, select a suitable catalyst, and promote the reduction of the reducing agent and NO x reaction while inhibiting the oxidation of the reducing agent by oxygen in the exhaust. According to the type of reducing agent, the existing SCR technology can be divided into NH produced by the decomposition of urea 3 The...
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The invention provides a urea crystallization control method and device, a storage medium and an electronic device. The method comprises the steps that according to a preset sampling interval, a crystallization energy factor and an exhaust temperature of an engine operation area within a preset time length are obtained, and a plurality of pairs of the crystallization energy factor-exhaust temperature are obtained; according to a plurality of pairs of the crystallization energy factor-exhaust temperature, a crystallization risk factor of urea within the preset time length is determined; and ifthe crystallization risk factor is larger than a preset threshold value, a urea crystallization self-adaptive control strategy is started to enable a urea selective catalytic reduction SCR system to enter a urea crystallization active elimination mode. According to the urea crystallization control method and device, the storage medium and the electronic device, active control over urea crystallization in the SCR system is realized, a series of problems caused by urea accumulation are avoided, and the treatment effect of vehicle tail gas and the operation stability of a vehicle are improved.
Description
[0001] Control method, device, storage medium and electronic equipment for urea crystallization technical field [0002] The present application relates to the technical field of vehicles, in particular to a method, device, storage medium and electronic equipment for controlling urea crystallization. Background technique [0003] At present, selective catalytic reduction (selective catalytic reducton, SCR) technology is to control diesel engine nitrogen oxides (NO x ) is the most effective way to discharge the urea solution into the exhaust pipe through the urea injection system. 3 , again by NH 3 NO in exhaust gas x reduced to N 2 Exhaust, excess NH 3 is also oxidized to N 2 discharge. These processes all need to absorb the heat of the exhaust gas. When the exhaust gas temperature is low, urea may not be completely decomposed, and crystals will form in the injection system, the wall of the exhaust pipe or the catalytic converter. If the crystallization is severe, st...
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IPC IPC(8): F01N3/20F01N9/00F01N3/021
CPCF01N3/2006F01N9/00F01N3/021F01N3/2066F01N2610/1486Y02A50/20Y02T10/12F01N2610/02F01N3/208F01N2900/0412F01N2900/0601F01N2900/1404F01N2900/1602F01N2900/1411F01N2900/1812F01N2900/1806
Inventor 谭旭光王意宝张晓丽
Owner WEICHAI POWER CO LTD