Closed loop control method for SCR (Selective Catalyst Reduction) system of all-working-condition diesel engine

A SCR system, closed-loop control technology, applied in mechanical equipment, engine components, combustion engines, etc., can solve the problems of low system control accuracy, inability to timely feedback, and inability to obtain diesel engine speed and load parameters, and achieve the effect of reducing NOx emissions

Inactive Publication Date: 2012-06-13
MILITARY TRANSPORTATION UNIV PLA
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Problems solved by technology

Its disadvantages are: (1) When the internal or external environment of the SCR post-treatment system, such as catalyst performance, temperature, oil quality and other factors change, it cannot be fed back to the system in time to adjust the dosage

Method used

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  • Closed loop control method for SCR (Selective Catalyst Reduction) system of all-working-condition diesel engine
  • Closed loop control method for SCR (Selective Catalyst Reduction) system of all-working-condition diesel engine
  • Closed loop control method for SCR (Selective Catalyst Reduction) system of all-working-condition diesel engine

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] The closed-loop control method of the SCR system of the diesel engine under all working conditions is carried out according to the following steps: (1) establish a new three-dimensional matrix of the reductant dosage of the SCR system based on the exhaust temperature and exhaust back pressure of the diesel engine under all working conditions; (2) use Nitrogen oxide sensor and PID controller form a closed-loop accurate control mode of the SCR system of the diesel engine under all working conditions;

[0018] The present invention as figure 2 As shown, under the calibration condition, the exhaust gas flow rate based on the exhaust temperature and exhaust back pressure is obtained from the universal characteristics of the diesel engine; at the same time, the original engine emission NO x Concentration, catalytic converter target conversion ratio, exhaust gas temp...

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Abstract

The invention discloses a closed loop control method for an SCR (Selective Catalyst Reduction) system of an all-working-condition diesel engine. The method is carried out according to the following steps of: (1) establishing a novel three-dimensional matrix of the adding amount of reducing agent for the SCR system based on exhaust temperature and exhaust backpressure of the all-working-condition diesel engine; and (2) forming a precise control mode of a closed loop of the SCR system of the all-working-condition diesel engine by utilizing a nitrogen oxide sensor and a PID (Proportion Integration Differentiation) controller. By using the closed loop control method for the SCR system of the all-working-condition diesel engine in the invention, the acquisition of working-condition parameters of the diesel engine can not depend on an electronic control unit (ECU) of the diesel engine, the technical obstacle that the current home and abroad SCR systems are only suitable for electrically controlling the diesel engine is broken through, and an approach for reducing the discharging amount of NOx is provided for vehicles assembled with light, middle and heavy non-electric control diesel engines.

Description

technical field [0001] The invention belongs to the technical field of diesel engine tail gas nitrogen oxide emission pollution control, and further relates to a closed-loop control method for an SCR system of a diesel engine under all working conditions based on exhaust temperature and exhaust back pressure. Background technique [0002] Energy saving and environmental protection are two important themes in the field of industrial technology in our country and the world today. Nitrogen oxides (NO x ) is the main pollutant emitted by diesel engines, and the use of diesel engine internal purification technology has been unable to meet the current and future implementation of emission regulations. Therefore, the adoption of diesel engine exhaust post-treatment purification technology is a necessary means to meet the increasingly stringent emission regulations (mainly National IV and above emission regulations). Combined with my country's national conditions and the status qu...

Claims

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Application Information

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IPC IPC(8): F01N9/00F01N11/00
CPCY02T10/47Y02A50/20Y02T10/40
Inventor 资新运刘洋张英锋庞海龙俞妍邓成林徐正飞卜建国姚广涛姜大海刘宏威
Owner MILITARY TRANSPORTATION UNIV PLA
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