Method and system for preventing diesel particulate filter burnout
A particulate filter, diesel engine technology, applied in the direction of machines/engines, mechanical equipment, engine components, etc., can solve the problem of inability to accurately control the oxygen concentration of diesel engine exhaust, large workload, and the risk of large burning and melting of particulate filter 131, etc. question
Active Publication Date: 2016-09-07
WEICHAI POWER CO LTD
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Problems solved by technology
[0008] However, the above open-loop control method needs to calibrate the different working conditions of different types of diesel engines, the workload is large, and the exhaust oxygen concentration of diesel engines cannot be accurately controlled, and there is still a large risk of melting the particulate matter filter 131
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[0035] The core of the present invention is to provide a method and system for preventing diesel particulate matter traps from melting, the method and system can accurately control the exhaust oxygen concentration of diesel engines, slow down the combustion speed of particulate matter in the particulate matter trap, and prevent particulate matter from being trapped The device is melted.
[0036] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. For ease of understanding and brevity of description, the description below will be combined with the method and system for preventing diesel particulate filter from melting, and the beneficial effects will not be discussed repeatedly.
[0037] Please refer to figure 2 , figure 2 It is a flow chart of a specific embodiment of the method for preve...
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The invention discloses a method and a system for preventing a diesel engine particle trap from melting. The method includes the steps of 10), pre-saving the set rotation speed and the set air-fuel ratio corresponding to particle trap critical melting; 20), acquiring the current rotation speed of a diesel engine; 30), determining whether the current rotation speed is higher than the set rotation speed or not by comparing the two, if so, returning to step 20), and if not, moving to the step 40); 40), acquiring the current exhaust oxygen concentration of the diesel engine, performing closed-loop control on the actual air-fuel ratio of the diesel engine according to the current exhaust oxygen concentration to allow the actual air-fuel ratio to be not higher than the set air-fuel ratio. By the arrangement, the method, as compared with the open-loop control in the background technology, is high in precision and capable of effectively controlling the exhaust oxygen concentration, the combustion speed of particles in the diesel engine particle trap can be reduced, and the diesel engine particle trap is prevented from melting.
Description
technical field [0001] The invention relates to the technical field of post-treatment of diesel engines, in particular to a method and system for preventing particulate matter traps of diesel engines from melting. Background technique [0002] Please refer to figure 1 , figure 1 It is a schematic diagram of the structure of a diesel engine equipped with a particulate filter. [0003] Each working cycle of a diesel engine includes four strokes of intake, compression, power and exhaust. During the intake stroke, air enters the cylinder 12 through the intake pipeline 11, and the intake pipeline 11 is provided with an air intake throttling device 111 to adjust the amount of air entering the cylinder 12; when the compression stroke is nearing the end, the air in the cylinder 12 Compressed, in a state of high temperature and high pressure; the fuel injector of the oil supply system sprays mist diesel into the combustion chamber, the oil mist is fully mixed with the compressed a...
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IPC IPC(8): F01N3/025
Inventor 张展腾刘兴义王意宝陶建忠苗垒张军冯海浩
Owner WEICHAI POWER CO LTD