A control device, control system and control method for the injection rate of urea aqueous solution in a diesel engine SCR system
A urea aqueous solution and SCR system technology, which is applied in the direction of mechanical equipment, electronic control of exhaust treatment devices, engine components, etc., can solve problems affecting normal operation, deterioration of diesel engine emissions, solid deposit blockage, etc., to avoid the formation of deposits , high NOx conversion efficiency, low leakage effect
Active Publication Date: 2017-02-15
北京科领动力科技有限公司
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
If the injection timing and injection rate of urea aqueous solution are unreasonable, the conversion efficiency of NOx will decrease, and the NH 3 Increased leakage, formation of solid deposits to clog the catalytic converter, etc., will worsen diesel engine emissions, increase fuel consumption, and affect its normal operation
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0033] The principle, working process and specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.
[0034] See attached figure 1 , a method for controlling the injection rate of urea aqueous solution in a diesel SCR system of the present invention, its hardware mainly includes: an engine intake mass flowmeter 11, an SCR catalytic converter 5, a NOx concentration sensor 1 before the catalytic converter, an exhaust gas temperature sensor 3 before the catalytic converter, Exhaust pressure sensor 4 , exhaust gas temperature sensor 6 after the catalyst, NOx concentration sensor 7 after the catalyst, urea pump 8 , urea tank 9 , urea nozzle 2 and control unit 10 .
[0035] During operation, the control unit 10 collects in real time the signal of the engine intake mass flow meter 11, the signal of the exhaust gas temperature sensor 3 before the catalyst, the signal of the NOx concentration sensor 1 before the cata...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a urea water solution spraying rate control method of a diesel SCR system. The method comprises the following steps: step one, judging whether an air exhaust state meets urea water solution spraying conditions or not, spraying if the state does not meet the spraying conditions, and conducting step two if the state meets the spraying conditions; steps two, calculating a theoretic urea water solution spraying rate m1; steps three, obtaining a urea water solution spraying rate correction factor k through table lookup, and revising the theoretic urea water solution spraying rate m1 to obtain a revised spraying rate m2; steps four, revising the revised spraying rate m2 again according to judging conditions to obtain a final spraying rate.
Description
technical field [0001] The invention belongs to the technical field of diesel engine nitrogen oxide (NOx) emission pollution control, in particular to the field of urea aqueous solution injection rate control in a diesel engine SCR system. Background technique [0002] Selective Catalytic Reduction (SCR) technology is one of the technologies for diesel engines to reduce nitrogen oxide (NOx) emissions. SCR technology needs to inject an appropriate amount of urea aqueous solution into the exhaust according to the exhaust state of the diesel engine. If the injection timing and injection rate of urea aqueous solution are unreasonable, the conversion efficiency of NOx will decrease, and the NH 3 Increased leakage, formation of solid deposits to clog the catalytic converter and other consequences will worsen diesel engine emissions, increase fuel consumption, and affect its normal operation. Contents of the invention [0003] The content of the present invention is a method fo...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): F01N9/00F01N3/20
CPCY02T10/12Y02T10/40
Inventor 赵彦光帅石金付海超唐韬陈铮闫孝伟
Owner 北京科领动力科技有限公司