A control method and control device that help diesel engine to heat up rapidly
A technology of a control device and a control method, which is applied in the direction of exhaust device, muffler device, electronic control of exhaust gas treatment device, etc. Effect
Active Publication Date: 2019-12-06
WEICHAI POWER CO LTD
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Problems solved by technology
In order to meet this emission requirement, SCR post-treatment technology has been widely used. At the same time, low conversion efficiency of NOx emissions and high emission value of SCR post-treatment system under low temperature conditions have become an unavoidable problem.
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[0055]In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. 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.
[0056] Glossary:
[0057] SCR: English full name: Selective Catalytic Reduction, Chinese name: Selective Catalytic Reduction;
[0058] NRTC: English full name: Non-Road Transient Cycle, Chinese name: Non-Road Transient Cycle.
[0059] Please refer to figure 1 with figure 2 , figure 1 The schematic diagram of the connection of the control...
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The invention discloses a control method helpful to rapid temperature rising of a diesel engine. The diesel engine is provided with a pressurization front gas inlet pipe, a pressurization rear gas inlet pipe, a pressurizer, a vortex front exhaust pipe, a vortex rear exhaust pipe, an after-treatment box, an after-treatment exhaust pipe and a control device. The after-treatment exhaust pipe communicates with the pressurization front gas inlet pipe through a communicating pipe, and the communicating pipe is provided with a valve. The control device is in communication connection with a first temperature sensor used for detecting the exhaust temperature of the after-treatment exhaust pipe. After the diesel engine is started, when the exhaust temperature of the after-treatment exhaust pipe is 120-150 DEG C lower than a first temperature, the valve is switched on through the control device. Tail gas enters the pressurization front gas inlet pipe through the communicating pipe, and the temperature rising process of the cold-state NRTC is shortened; a SCR system enters the urea jetting state as early as possible; NOx emission at the stage is further reduced; and NOx emission conversion efficiency, achieved under the low-temperature circumstance, of the SCR after-treatment system is improved. The invention further discloses a control device helpful to rapid temperature rising of the diesel engine.
Description
technical field [0001] The invention relates to the technical field of cold start of a diesel engine, in particular to a control method and a control device that help a diesel engine to rapidly rise in temperature. Background technique [0002] With the increasingly stringent requirements of emission regulations, transient test cycles are widely introduced into diesel engine emission regulations. For example, when non-road diesel engines reach China's fourth stage, diesel engines need to undergo NRTC transient cycle tests under cold and hot states. In order to meet this emission requirement, SCR post-treatment technology has been widely used. At the same time, low conversion efficiency of NOx emissions and high emission value of SCR post-treatment system under low temperature conditions have become an unavoidable problem. [0003] The SCR system is an important part of the aftertreatment system of a diesel engine. It mainly reduces the NOx components in diesel engine emissi...
Claims
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IPC IPC(8): F02M26/06F02M26/13F02M26/47F01N3/20F01N9/00F01N11/00
CPCF01N3/208F01N9/00F01N11/002F02M26/06F02M26/13F02M26/47F02M2026/004Y02T10/12Y02T10/40
Inventor 韩金辉赵晓晓李丽丽赵联海王西婕
Owner WEICHAI POWER CO LTD