Adaptive Dual Closed Loop Speed Control with Throttle Valve Dynamics for Natural Gas Engine in Range-Extended Electric V
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ght © 2020 KSAE/ 11808 pISSN 12299138/ eISSN 19763832
ADAPTIVE DUAL CLOSED LOOP SPEED CONTROL WITH THROTTLE VALVE DYNAMICS FOR NATURAL GAS ENGINE IN RANGE-EXTENDED ELECTRIC VEHICLES Wenyu Xiong1), Jie Ye1, 3)*, Qichangyi Gong1), Han Feng2), Anwen Shen1) and Jinbang Xu2) The Key Laboratory of Imaging Processing and Intelligent Control, School of Artificial Intelligence and Automation, Huazhong University of Science and Technology, Wuhan 430074, China 2) The National Key Laboratory of Science and Technology on Multispectral Information Processing, School of Artificial Intelligence and Automation, Huazhong University of Science and Technology, Wuhan 430074, China 3) Department of DC Power Transmission Technology, Global Energy Interconnection Research Institute, No. 18 Binhe Avenue, Future Science Park, Changping District, Beijing 102209, P.R. China 1)
(Received 3 January 2019; Revised 4 June 2019; Accepted 20 January 2020) ABSTRACTThis study presents an adaptive dual closed-loop speed control strategy for the natural gas engine used in a range extender to improve the robustness against parameter uncertainties, unmodeled dynamics and unknown disturbance. Compared to existing methods, this strategy takes into account the influence of the throttle valve dynamics on the intake airflow in the design of the inner-loop intake pressure controller, which is strongly nonlinear, and considers the inaccuracy of the output torque as well as unknown disturbance in the outer-loop speed controller design, which is more practical. Furthermore, the controller is incorporated with an adaptive strategy to overcome the uncertainty of parameters using the information of the engine speed and the intake pressure. Theoretical analysis indicates that this strategy can meet the demands of the wide range speed regulation of the range extender engine without knowing the specific values of the engine parameters. Moreover, the capability of the proposed controller to preserve the performance in the presence of disturbance in various working conditions is evaluated by co-simulation on the platform of Matlab/Simulink with GTpower and experiments on a range extender. KEY WORDS : Range extender engine, Speed control, Dual closed loop, Adaptive, Unknown parameters, Throttle dynamics
NOMENCLATURE pm Tm R Vm m· at m· ap Vd Ct D pa Ta d J
B Tg Te di
: air pressure in the intake manifold, pa : air temperature in the intake manifold, K : gas constant of air, 289 J/(kg·K) : manifold volume, L : mass rate of air passing through the throttle, g/s : air mass rate entering into cylinders, g/s : volumetric efficiency : displacement of engine, L : speed of the engine, rad/s : flow coefficient : throttle diameter, mm : ambient pressure, pa : ambient temperature, K : adiabatic constant : throttle actual angle, deg : throttle desired angle, deg : time constant of the throttle, ms : inertia of the system, kg·m2
: damping coefficient : generator torque, Nm : engine torque, Nm : unknown disturbance, Nm
1. INTRODUCTION With the shortage of energy and
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