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Method and system for controlling urea solution spraying amount in closed loop mode through SCR system

A technology of SCR system and solution injection, which is applied in the direction of mechanical equipment, engine components, machines/engines, etc., can solve problems such as narrow application range, high NH3 leakage, and poor anti-interference performance of the system, so as to improve conversion efficiency and reduce leakage volume effect

Active Publication Date: 2015-05-13
DONGFENG COMML VEHICLE CO LTD
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Problems solved by technology

[0005] Aiming at the defects of the existing SCR system control such as high NH3 leakage, or narrow application range, or relatively poor anti-interference performance of the system, the present invention provides a method and system for closed-loop control of urea solution injection in the SCR system

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  • Method and system for controlling urea solution spraying amount in closed loop mode through SCR system
  • Method and system for controlling urea solution spraying amount in closed loop mode through SCR system
  • Method and system for controlling urea solution spraying amount in closed loop mode through SCR system

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] see figure 1 , a SCR system closed-loop control urea solution injection method, it is characterized in that, comprising the following steps:

[0027] Measure the temperature at the inlet and outlet of the SCR catalytic converter 1, and transmit the temperature signal of the SCR catalytic converter to the urea injection controller 2;

[0028] Measuring the NH3 leakage, and transmitting the NH3 leakage feedback signal to the urea injection controller 2;

[0029] Measure the NOx flow value, and transmit the NOx flow value to the urea injection controller 2;

[0030] Receive the SCR catalytic converter temperature signal, receive the NH3 leakage feedback signal, receive the NOx flow value, calibrate the NH3 surface coverage reference value, calculate the basic injection volume of urea solution, judge the SCR catalytic converter t...

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Abstract

The invention provides a method and system for controlling the urea solution spraying amount in a closed loop mode through an SCR system. The method for controlling the urea solution spraying amount includes the steps of measuring and transmitting SCR catalyst converter temperature signals, measuring and transmitting NH3 leakage rate feedback signals, measuring and transmitting NOx flow values, and calculating and sending out the final urea solution spraying amount. The system for controlling the urea solution spraying amount comprises an SCR catalyst converter (1), a urea spraying controller (2), an exhaust air temperature sensor (3), an NH3 sensor (4), a urea spraying metering pump (5) and an NOx sensor (6). The exhaust air temperature sensor (3), the NH3 sensor (4), the urea spraying metering pump (5) and the NOx sensor (6) are electrically connected with the urea spraying controller (2). The urea solution spraying amount can be more accurately controlled on the premise that two different SCR catalyst converter temperature conditions are distinguished.

Description

technical field [0001] The invention relates to a method for controlling the injection amount of urea solution by an SCR system, and more specifically relates to a method and a system for closed-loop controlling the injection amount of urea solution by an SCR system, belonging to the technical field of engine aftertreatment control. Background technique [0002] Automotive SCR systems can effectively reduce NOx emissions from heavy-duty diesel locomotives; at the same time, in order to meet the emission requirements of diesel engines, the leakage of NH3 needs to be considered. At present, the control of the SCR system includes two types: the open-loop control of the SCR system and the closed-loop control of the NOx sensor. [0003] The open-loop control of the SCR system can achieve the highest NOx conversion efficiency; however, it has a high NH3 leakage, and its control accuracy is greatly affected by external factors, and it is difficult to further improve it. NOx sensor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20
CPCY02T10/12
Inventor 菅蒙倪洪飞余建华张晓光
Owner DONGFENG COMML VEHICLE CO LTD
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