MPC-based Intake Pressure Control of Electric Compound Supercharged Diesel Engine

doi:10.12382/bgxb.2023.0694

Abstract

Abstract:

Turbocharging technology is one of the main ways to improve the power performance and economy of engine, while traditional exhaust gas turbocharging has hysteresis, especially in the low-speed range of high-power density diesel engines. As an auxiliary and optimization of exhaust gas turbocharging technology, the electric supercharging technology can effectively make up for the shortcomings of turbocharging technology. However, due to the increased degree of control freedom of the electric supercharger, the coordinated control of electric composite supercharging system becomes the key to guaranteeing its performance. In this paper, an electric composite diesel engine intake control strategy based on model predictive control (MPC) is proposed. Firstly, a discrete predictive control model and an exhaust gas turbine observer and flow observer are established based on the mathematical and physical equations of electric supercharger, and then the control strategy and control parameters are verified and calibrated through a co-simulation platform,. Finally, the effects of MPC and traditional PID control under different working conditions as well as the ability to resist power supply voltage disturbance are compared. The results show that the control algorithm based on the observers can realize the coordinated control of the electric composite supercharging system, with maximum steady-state error less than or equal to 1%, without adding turbine speed sensors. It can improve the low-speed response, reduce the transient lag and reach the target inlet pressure ratio within 5.2s, as adapting the response characteristics of exhaust gas turbine under different normal operating conditions. Compared with the traditional PID control algorithm, it has better anti-interference and control accuracy, improving 42% dynamic error.

Key words: electric compound supercharging, air intake control, model predictive control, diesel engine control

CLC Number:

TK421

WANG Tianxiang, CUI Tao, ZHANG Fujun, ZHAO Yankai. MPC-based Intake Pressure Control of Electric Compound Supercharged Diesel Engine[J]. Acta Armamentarii, 2024, 45(10): 3642-3653.

Figures/Tables 19

Fig.1 Construction of electric supercharger

Fig.2 Schematic diagram of electric supercharger parameters

Fig.3 k moment calculation logic diagram

Fig.4 Overall structure of MPC strategy

Table 1 Partial parameters of diesel engine

参数	数值
柴油机压缩比	16.5
柴油机气缸排列	V型
柴油机缸数	6
柴油机缸径/mm	132
电机额定转速/(r·min^-1)	40000
电机额定扭矩/(N·m)	1.8
电机额定功率/kW	7.5
电机最大功率/kW	12

Fig.5 Verificated results of model under different working conditions

Fig.6 Predictive model validation

Fig.7 Target engine speed of 1200r/min under starting condition with load

Fig.8 Target engine speed of 1500r/min under starting condition with load

Fig.9 1500r/min predicted results

Fig.10 1200r/min variable load condition verification

Fig.11 Speed condition verification of 1200N·m variable engine

Fig.12 1200r/min variable load condition

Fig.13 1200N·m variable engine speeds

Fig.14 Comparison results of typical test conditions

Fig.15 PID control effect under different disturbances

Fig.16 MPC effect under different disturbances

Fig.17 PID control output target speed under 0.5s disturbance

Fig.18 MPC output target speed under 0.5s disturbance

References 21

[1]	杨攀涛, 崔涛, 赵彦凯. 电动增压器对柴油发动机低速稳态性能的影响[J]. 兵工学报, 2021, 42(9): 1829-1837. doi: 10.3969/j.issn.1000-1093.2021.09.003
	YANG P T, CUI T, ZHAO Y K. The influence of electric supercharger on steady state performance of engine at low speed[J]. Acta Armamentarii, 2021, 42(9): 1829-1837. (in Chinese) doi: 10.3969/j.issn.1000-1093.2021.09.003
[2]	TRAN H, RICHARD B, GRAY K, et al. Developing a performance specification for an electric supercharger to satisfy a range of downsized gasoline engine applications: 2016-01-1041[R]. Washington, DC, US: SAE International, 2016.
[3]	MAZANEC J M, VANG N S, KOKJOHN S L. Enabling off-highway diesel engine downsizing and performance improvement using electrically assisted turbocharging[J]. International Journal of Engine Research, 2023, 24(9): 4104-4126.
[4]	ALSHAMMARI M, ALSHAMMARI F, PESYRIDIS A. Electric boosting and energy recovery systems for engine downsizing[J]. Energies, 2019, 12(24): 4636.
[5]	XIA F, GRIEFNOW P, TIDAU F, et al. Electric torque assist and supercharging of a downsized gasoline engine in a 48V mild hybrid powertrain[J]. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 2021, 235(5): 1245-1255.
[6]	MIZUSHIMA N, OGUMA M. Energy conversion analysis for mild hybrid electric vehicles equipped with an electric supercharged SI engine via multi-domain acausal modeling[J]. Energy Conversion and Management, 2023, 286: 117054.
[7]	GRIEFNOW P, JAKOBY M, DORSCHEL L. Nonlinear model predictive control of mild hybrid powertrains with electric supercharging[J]. IEEE Transactions on Vehicular Technology, 2021, 70(9): 8490-8504.
[8]	LEFEBVRE A, GUILAIN S. Transient response of a turbocharged SI engine with an electric boost pressure supply: 2003-01-1844[J]. Washington, DC, US:SAE International, 2003.
[9]	NOOR A M, PUTEH R C, RAJOO S, et al. Simulation study on electric turbo-compound (ETC) for thermal energy recovery in turbocharged internal combustion engine[J]. Applied Mechanics and Materials, 2015, 4211: 799-800.
[10]	EKBERG K, ERIKSSON L, SUNDSTRM C. Electrification of a heavy-duty CI truck—comparison of electric turbocharger and crank shaft motor[J]. Energies, 2021, 14(5): 1402.
[11]	陈龙, 张颖超, 潘小兵, 等. 电动复合增压对柴油机高海拔性能的影响[J]. 陆军工程大学学报, 2023, 2(2): 39-45. doi: 10.12018/j.issn.2097-0730.20220324003
	CHEN L, ZHANG Y C, PAN X B, et al. Effect of electric combined turbocharging on high altitude performance of diesel engine[J]. Journal of Army University of Engineering, 2023, 2(2): 39-45. (in Chinese)
[12]	ZHENG K P, WEI Z B, QIN B Z. Application research of electrical supercharger for improving performances of diesel engine under plateau environment[J]. Applied Mechanics and Materials, 2014, 3188: 552-552.
[13]	李由. 电辅助涡轮增压柴油机气路系统建模与控制[D]. 长春: 吉林大学, 2017.
	LI Y. Modeling and control of electric auxiliary turbocharged diesel engine gas system[D]. Changchun: Jilin University, 2017. (in Chinese)
[14]	VILLEGAS J, GAO B, SVANCARA K, et al. Real-time simulation and control of an electric supercharger for engine downsizing[C]// Proceedings of 2011 IEEE Vehicle Power and Propulsion Conference. Chicago, IL, US:IEEE, 2011.
[15]	WANG Y, ZHENG Q G, DU Z Y, et al. Research on nonlinear model predictive control for turboshaft engines based on double engines torques matching[J]. Chinese Journal of Aeronautics, 2020, 33(2): 561-571.
[16]	XIAO B, HELLSTROM E, KELLY T, et al. Dynamic pressure ratio allocation for electric supercharger and turbocharger coordination[C]// Proceedings of 2018 Annual American Control Conference. Milwaukee, WI, US:IEEE, 2018: 2455-2460.
[17]	HÄNGGI S, FREY J, DOOREN S. A modular approach for diesel engine air path control based on nonlinear MPC[J]. IEEE Transactions on Control Systems Technology, 2023, 31(4): 1521-1536.
[18]	VERMILLION C, BUTTS K, REIDY K. Model predictive engine torque control with real-time driver-in-the-loop simulation results[C]// Proceedings of the 2010 American Control Conference. Baltimore, MD, US:IEEE, 2010: 1459-1464.
[19]	于海鹏, 宋康, 谢辉. 基于模型预测的电辅助涡轮增压柴油机空气系统优化控制研究[J]. 内燃机工程, 2018(4): 39-46.
	YU H P, SONG K, XIE H. Research on optimal control of air system of diesel engine with e turbo based on model prediction[J]. Chinese Internal Combustion Engine Engineering, 2018(4): 39-46. (in Chinese)
[20]	KEKIK B, AKAR M. Model predictive control of diesel engine air path with actuator delays[J]. IFAC PapersOnLine, 2019, 52(18): 150-155. doi: 10.1016/j.ifacol.2019.12.222
[21]	MORIYASU R, NOJIRI S, MATSUNAGA A, et al. Diesel engine air path control based on neural approximation of nonlinear MPC[J]. Control Engineering Practice, 2019, 91: 104114.