Anti-crystallization control method and device based on sulfur dioxide sensor
A technology of sulfur dioxide and control methods, which is applied in the direction of mufflers, exhaust devices, machines/engines, etc., and can solve problems affecting SCR efficiency and life
Active Publication Date: 2021-02-12
WEICHAI POWER CO LTD
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[0003] At this time, since the urea sprayed into the SCR cannot be combined with the SCR, crystals will form in the SCR after the water in the urea is evaporated, and the accumulation of urea crystals will affect the efficiency and life of the SCR
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[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0049] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0050] refer to figure 1 , figure 1 It is a schematic flowchart of an anti-crystallization control method based on a sulfur dioxide sensor provided by an embodiment of the present invention.
[0051] The anti-cr...
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The invention provides an anti-crystallization control method and device based on a sulfur dioxide sensor. The method comprises the following steps that 1, the concentration of sulfur dioxide in tailgas is obtained; 2, according to the sulfur dioxide concentration, the current sulfide salt content in SCR in the whole operation process of an engine is calculated; 3, the maximum sulfide salt storage amount of the SCR is obtained, and the current sulfide salt storage rate is calculated according to the current sulfide salt content and the maximum sulfide salt storage amount; 4, the maximum ammonia storage amount of the SCR is obtained, and the adhesion capacity and the mass comprehensive ratio of ammonia and sulfide salt are calculated according to the maximum ammonia storage amount and themaximum sulfide salt storage rate; 5, the current SCR residual ammonia storage capacity is calculated according to the sulfide salt storage rate and the mass comprehensive ratio; and 6, a urea injection amount correction value is obtained according to the SCR residual ammonia storage capacity, and the injection amount of urea is controlled according to the urea injection amount correction value, so that the situation of crystallization increase caused by excessive urea injection is avoided.
Description
technical field [0001] The invention relates to the technical field of diesel engine control, and more specifically relates to a method and device for anti-crystallization control based on a sulfur dioxide sensor. Background technique [0002] Vehicle diesel contains a certain amount of sulfur. When diesel is burned in the cylinder, part of the sulfur will enter the after-treatment system along with the exhaust gas, and this part of sulfur will react to produce sulfide, which is attached to the SCR (Selective Catalytic Reduction, Selective Catalytic Reduction, Selective Catalytic Reduction, Active catalytic reduction technology) on the catalyst, thereby preventing the urea from combining with the catalyst and reducing the ammonia storage capacity of the SCR. [0003] At this time, since the urea sprayed into the SCR cannot be combined with the SCR, crystals will form in the SCR after the water in the urea is evaporated, and the accumulation of urea crystals will affect the e...
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IPC IPC(8): F01N3/20
CPCF01N3/208F01N2610/02F01N2610/1486F01N2900/1402F01N2900/16Y02T10/12
Inventor 王毓源王金平徐文双赵杰侯郭顺
Owner WEICHAI POWER CO LTD