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Independent SCR (semiconductor control rectifier) system control method and control device based on NOx (nitrogen oxide) sensor

A technology of SCR system and control method, which is applied in the direction of electronic control of muffler, exhaust device, exhaust treatment device, etc., and can solve the problem of increasing the workload of SCR control system, engine one-to-one correspondence, SCR control system applicability limitation, etc. problem, to achieve the simple effect of exhaust parameter acquisition

Inactive Publication Date: 2012-09-19
ZHEJIANG UNIV
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Problems solved by technology

Due to the communication with the engine electronic controller (ECU), it is necessary for the SCR control system to match the engine interface parameters, which undoubtedly increases the workload of the development of the SCR control system and the one-to-one correspondence with the engine. The applicability to the SCR control system is limited

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  • Independent SCR (semiconductor control rectifier) system control method and control device based on NOx (nitrogen oxide) sensor
  • Independent SCR (semiconductor control rectifier) system control method and control device based on NOx (nitrogen oxide) sensor
  • Independent SCR (semiconductor control rectifier) system control method and control device based on NOx (nitrogen oxide) sensor

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Embodiment Construction

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0020] figure 1 It is the overall structural block diagram of the SCR system.

[0021] This overall structure block diagram is made up of inherent device of SCR system itself and independent SCR system control device of the present invention, and inherent device of SCR system itself comprises urea nozzle 5, urea tank liquid level and temperature sensor 8, blue solution inlet pipe 9, Add blue solution return pipe 10, urea tank 11, urea pump 12, engine 15, SCR catalyst 16. The independent SCR system control device of the present invention includes a differential pressure sensor 1, an inlet NOx sensor 2, an absolute pressure sensor 3, an inlet temperature sensor 4, an outlet temperature sensor 6, an outlet NOx sensor 7, a CAN bus 13, and an independent control unit MCU 14.

[0022] figure 2 It is a schematic diagram of the structure of the independent contro...

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Abstract

The invention discloses an independent SCR (semiconductor control rectifier) system control method and a control device based on a NOx sensor. A signal acquiring unit disclosed by the invention mainly comprises a differential pressure transducer, an inlet NOx sensor, an absolute pressure sensor, an inlet temperature sensor, an outlet temperature sensor and an outlet NOx sensor. The control device is provided with a CAN (controller area network) bus interface, and a singlechip is communicated with an urea pump through the CAN bus interface to control the spray of the amount of blue adding solution. The signal acquiring unit acquires the state of engine tail gas in real time, and the acquired state is transmitted to the singlechip for calculating the required spray amount of the blue adding solution. According to the independent SCR system control method and the control device, the design of a traditional engine control system is not changed, and only six sensors are installed on an exhaust pipeline to directly configure the independent SCR control device, and the SCR control device is completely independent from an engine electronic controller.

Description

technical field [0001] The invention relates to an independent SCR system control method and control device, belongs to the technical field of engine engineering, can be better applied to various engine models, and saves complex engine communication matching work. Specifically, it is an SCR system control method and control device based on an independent NOx sensor. Background technique [0002] With the rapid development of the automobile industry, the problem of exhaust pollution is becoming more and more prominent, and my country's emission regulations (Stage IV and Phase V stipulated in the regulations) are also becoming stricter, which requires continuous improvement of exhaust gas post-treatment technology, and EGR exhaust gas Compared with after-treatment technology, in-cylinder optimized combustion + SCR exhaust after-treatment system has more advantages, which is not only beneficial to fuel economy, but also has lower sensitivity to sulfur, and it is easier to meet h...

Claims

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Application Information

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IPC IPC(8): F01N9/00F01N3/20
CPCY02T10/24Y02T10/47Y02A50/20Y02T10/12Y02T10/40
Inventor 吴锋范汉茂姚栋伟甘旭波凌鑫晨
Owner ZHEJIANG UNIV
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