NOx emission level monitoring method and device for electronic-control diesel engine EGR (exhaust gas recirculation) system

A technology of emission level and diesel engine, applied in electrical control, mechanical equipment, engine control, etc., can solve the problem of high price of NOx sensor, achieve strong anti-interference and cost-saving effects

Active Publication Date: 2011-09-14
TSINGHUA UNIV +1
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Problems solved by technology

[0004] In order to monitor NOx emission level, NOx sensor can be used for real-time measurement, but the price of NOx sensor is relatively high

Method used

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  • NOx emission level monitoring method and device for electronic-control diesel engine EGR (exhaust gas recirculation) system
  • NOx emission level monitoring method and device for electronic-control diesel engine EGR (exhaust gas recirculation) system
  • NOx emission level monitoring method and device for electronic-control diesel engine EGR (exhaust gas recirculation) system

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Embodiment Construction

[0030] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0031] The invention is based on a principle: that is, there is an inverse relationship between the NOx emission level and the opening degree of the EGR valve, such as figure 1 As shown, when the EGR valve opening is larger, the NOx emission level is lower, and when the EGR valve opening is smaller, the NOx emission level is higher.

[0032] like figure 2As shown, the EGR system NOx emission level monitoring device of the present invention includes an engine 10 and a processor 20 . The engine 10 includes an EGR valve position sensor 11 , other sensors 12 , and an actuator 13 . The measurement signal of the sensor 11 is the voltage signal of the EGR valve position sensor, and the measurement signal of the sensor 12 is the engine state signal, which may include engine speed, accelerator opening position, coolant temperature, etc.; the actuator 13 is th...

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Abstract

The invention relates to a NOx emission level monitoring method and device for an electronic-control diesel engine EGR (exhaust gas recirculation) system. The monitoring method comprises the steps of setting EGR valve position sensor, other sensors, an EGR valve, an engine management module, an EGR opening conversion module, an EGR valve blocking state recognition state and an NOx emission level monitoring module device, and presetting a voltage of the ERG valve position sensor corresponding to the opening of 0% and opening valve values I, II, III and IV; detecting control signals and target opening of the EGR valve by the engine management module; obtaining actually-detected opening corresponding to the position sensor by the calculus of interpolation of the EGR valve blocking state recognition module; judging the blocking state of the ERG valve by the ERG blocking state recognition module according to the actually-detected opening and the target opening; and judging a NOx emission level by the NOx emission level monitoring module according to the actual-detected opening and the blocking state of the EGR valve by adopting a hysteresis algorithm. The method and the device directlyadopt the EGR valve position sensor as a NOx emission level signal source without the need of a NOx senosr, thus saving the cost.

Description

technical field [0001] The invention relates to an electronically controlled diesel engine monitoring method and system, in particular to a position sensor-based electronically controlled diesel engine EGR system NOx emission level monitoring method and device. Background technique [0002] As government regulations continue to escalate, the emission limits for diesel engines required in the regulations also continue to decrease. This has led diesel engine manufacturers to adopt many new exhaust aftertreatment technologies to reduce emissions. EGR (Exhaust Gas Recirculation, exhaust gas recirculation technology) is a widely used technology. In this technology, part of the exhaust gas and fresh air are drawn back to participate in the combustion reaction, and the high heat capacity ratio of a large amount of inert gas contained in the exhaust gas is used to reduce the NOx component in the emission pollutants. Since the formation condition of NOx is high temperature and oxyg...

Claims

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Application Information

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IPC IPC(8): F02D43/00
Inventor 张科勋杨福源欧阳明高郝守刚李进
Owner TSINGHUA UNIV
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