Method, device and equipment for adjusting urea injection amount of engine
A technology of urea injection and adjustment method, which is applied in the direction of mechanical equipment, engine components, combustion engines, etc., can solve the problems that affect the exhaust gas treatment effect, and the urea solution cannot be evaporated and decomposed in time, so as to reduce the risk of crystallization, improve rationality, and improve The effect of matching
Pending Publication Date: 2022-06-07
WEICHAI POWER CO LTD
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Problems solved by technology
However, when the engine is running under transient conditions and the exhaust volume of the engine increases suddenly, the engine will inject a large amount of urea, and the urea solution cannot be evaporated and decomposed in time, which will cause the selective catalytic reduction converter (SelectiveCatalytic Reduction, SCR) to mix Crystallization occurs in the cavity, which affects the treatment effect of exhaust gas
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[0030] In order to make the purposes, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.
[0031] Diesel engines usually use selective catalytic reduction technology to treat the exhaust gas emitted by diesel engines. By injecting urea into the exhaust gas discharged from the engine, this technology will remove NO in the exhaust gas x revert to N 2 and H 2 O. How to calculate the urea injection amount is...
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The invention provides an adjusting method, device and equipment for the urea injection amount of an engine, and the method comprises the steps that if it is monitored that the accelerator opening degree change rate of the engine is larger than or equal to a preset threshold value, the exhaust pressure and the exhaust temperature of the engine and the first change amount corresponding to the urea injection amount of the engine are determined; determining a first correction coefficient according to the exhaust pressure, and determining a second correction coefficient according to the exhaust temperature; and according to the first correction coefficient, the second correction coefficient and the first variable quantity, the urea injection quantity of the engine is adjusted. Through the method, the rationality of the urea injection amount of the engine can be improved, the matching degree of the urea injection amount of the engine and the increase condition of the waste gas actually flowing through the SCR mixing cavity is improved, and the crystallization risk of the SCR mixing cavity is reduced.
Description
technical field [0001] The present application relates to the technical field of engines, and in particular, to a method, device and device for adjusting the urea injection amount of an engine. Background technique [0002] In order to reduce environmental pollution, the diesel engine usually adopts the selective catalytic reduction technology to treat the exhaust gas discharged from the diesel engine. By injecting urea into the exhaust gas discharged from the engine, there will be NO in the exhaust gas x revert to N 2 and H 2 O. [0003] How to calculate the urea injection amount is the key to this technology. In the prior art, the urea injection amount is usually determined according to the exhaust gas volume of the engine. However, when the engine runs under transient conditions and the exhaust volume of the engine increases suddenly, the engine will inject a large amount of urea, and the urea solution cannot be evaporated and decomposed in time, which will cause the ...
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Login to View More IPC IPC(8): F01N9/00F01N3/20
CPCF01N9/00F01N3/208F01N2610/02Y02T10/40
Inventor 孙善良赵德财
Owner WEICHAI POWER CO LTD