A decoupling control method of diesel engine VGT-EGR system based on composite anti-disturbance

Abstract

The invention discloses a decoupling control method of a diesel engine VGT-EGR system based on compound anti-disturbance, which mainly includes static feedforward control, dynamic feedforward control and active anti-disturbance control ADRC. The invention converts the two-input and two-output system of the VGT-EGR system into two single-input and single-output channels, and influences the coupling between the two channels, the dynamic characteristics of each channel with the change of engine working conditions, and the external environment Disturbances are uniformly considered as total disturbances. Use ADRC for real-time observation and compensation of total disturbances without the need for precise modeling. However, the bandwidth of ADRC is limited by the sampling frequency and noise, and the transient tracking is slow. Therefore, the present invention adds static feed-forward control, and specially designs a simple and effective model-based dynamic feed-forward control. Both the simulation and experimental verification results show that the control parameter calibration of the present invention is simple, and only one set of parameters is needed to realize fast tracking of boost pressure and intake air volume in all working conditions.

Description

technical field [0001] The invention relates to the control of the air system of diesel engines, especially designed for diesel engines equipped with variable geometry turbine (VGT) and external exhaust gas recirculation (EGR) systems, decoupling control of boost pressure and fresh air intake. Background technique [0002] The air system of a diesel engine is an important link to control the composition of intake air (mainly including fresh air and recirculated exhaust gas), intake pressure and temperature, and plays a vital role in improving the combustion process of diesel engines and reducing fuel consumption and emissions. With the increasingly stringent requirements of emission regulations, the structure of the air system is becoming more and more complex, and the requirements for control accuracy and response speed are also increasing, which makes the control of the air system face more and more challenges. There are various hardware configuration schemes for the air s...

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Problems solved by technology

Among them, robust control (X.Wei and L.del Re. "Gainscheduled H-infinity control for air path systems of diesel engines using LPVtechniques". IEEE Trans.Control Syst.Technol, vol.15, no.3, pp. 406–415, May 2007.) have been adopted by researchers, however, in order to reduce the sensitivity to model accuracy, the design of robust control is usually conservative at the expense of response speed

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