Method, device and system for monitoring urea nozzle
A technology of urea nozzle and monitoring device, which is applied in the direction of noise reduction device, exhaust device, electric control of exhaust gas treatment device, etc., can solve the problems of monitoring and inability to realize urea nozzle and so on
Active Publication Date: 2020-05-19
WUXI WEIFU LIDA CATALYTIC CONVERTER
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Problems solved by technology
[0003] According to the requirements of emission regulations, it is necessary to monitor whether the urea nozzle is working normally, and the control system in the prior art cannot realize the monitoring of the urea nozzle
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[0044] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0045] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only Embodiments of some, but 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 shall fall within the protection scope of the present invention.
[0046] It should be noted that the terms "f...
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The invention relates to the technical field of diesel engine post-processing system control, and particularly discloses a monitoring method of a urea nozzle. The urea nozzle and a urea pump are driven by PWM waves. The monitoring method of the urea nozzle comprises the steps that the drive duty cycle of the urea nozzle and the drive duty cycle of the urea pump in a current monitoring period are acquired correspondingly; the average value of the drive duty cycle of the urea nozzle and the average value of the drive duty cycle of the urea pump in the current monitoring period are calculated correspondingly; the steps are repeated to obtain the average value of the drive duty cycle of the urea nozzle and the average value of the drive duty cycle of the urea pump in multiple monitoring periods; and a diagnosis result is obtained by diagnosing the urea nozzle according to the average value of the drive duty cycle of the urea nozzle and the average value of the drive duty cycle of the ureapump in the multiple monitoring periods. The invention further discloses a monitoring device and system of the urea nozzle. According to the monitoring method of the urea nozzle, the monitoring of theurea nozzle is realized, and the requirements of relevant regulations are met.
Description
technical field [0001] The invention relates to the technical field of diesel engine aftertreatment system control, in particular to a monitoring method for urea nozzles, a monitoring device for urea nozzles, and a monitoring system for urea nozzles including the monitoring device for urea nozzles. Background technique [0002] With the further tightening of national emission regulations, diesel engines need to use after-treatment systems to further reduce emissions in order to meet the requirements of emission regulations. The SCR (Selective Catalytic Reduction) system sprays urea solution into the exhaust, and the urea solution decomposes into NH at high temperature 3 , Under the action of the catalyst, it reacts with the NOx in the exhaust gas, thereby eliminating the harmful exhaust NOx in the exhaust gas. The urea injection system in the SCR system is responsible for regularly and quantitatively injecting urea solution into the exhaust gas, mainly including urea pump, ...
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Patent Timeline
Login to View More IPC IPC(8): F01N11/00F01N3/20
CPCF01N3/2066F01N3/208F01N11/00F01N2570/14F01N2610/02Y02T10/40
Inventor 苗垒虞晓阳冒维维
Owner WUXI WEIFU LIDA CATALYTIC CONVERTER