Fuel consumption assessment of an electrified powertrain with a multi-mode high-efficiency engine in various levels of hybridization

Abstract Powertrain electrification including hybridizing advanced combustion engines is a viable cost-effective solution to improve fuel economy of vehicles. This will provide opportunity for narrow-range high-efficiency combustion regimes to be able to operate and consequently improve vehicle’s fuel conversion efficiency, compared to conventional hybrid electric vehicles. Low temperature combustion (LTC) engines offer the highest peak brake thermal efficiency (BTE) reported in literature, but these engines have narrow operating ranges. In addition, LTC engines have ultra-low soot and nitrogen oxides (NOx) emissions, compared to conventional compression ignition and spark ignition (SI) engines. In this study, an experimentally developed multi-mode LTC-SI engine is integrated into a parallel hybrid electric configuration, where the engine operation modes include homogeneous charge compression ignition (HCCI), reactivity controlled compression ignition (RCCI), and conventional SI. The powertrain controller is designed to enable switching among different modes, with minimum fuel penalty for transient engine operations. A pontryagin’s minimum principal (PMP) methodology is used in the energy management supervisory controller to study a multi-mode LTC engine in parallel HEV architecture with various hybridization levels. The amount of torque assist by the e-motor can change the LTC mode operating time, which leads to variation in the vehicle’s fuel consumption. The results for the urban dynamometer driving schedule (UDDS) driving cycle show the maximum benefit of the multi-mode LTC-SI engine is realized in the mild electrification level, where the LTC mode operating time increases dramatically from 5.0% in a plug-in hybrid electric vehicle (PHEV) to 20.5% in a mild HEV.

[1]  Mahdi Shahbakhti,et al.  Physics Based Control Oriented Model for HCCI Combustion Timing , 2010 .

[2]  Xiaosong Hu,et al.  Energy efficiency analysis of a series plug-in hybrid electric bus with different energy management strategies and battery sizes , 2013 .

[3]  Hamid Reza Karimi,et al.  A Robust Observer-Based Sensor Fault-Tolerant Control for PMSM in Electric Vehicles , 2016, IEEE Transactions on Industrial Electronics.

[4]  Mahdi Shahbakhti,et al.  Modeling and analysis of fuel injection parameters for combustion and performance of an RCCI engine , 2016 .

[5]  Pierluigi Pisu,et al.  A control benchmark on the energy management of a plug-in hybrid electric vehicle , 2014 .

[6]  Jeffrey B. Burl,et al.  Catch energy saving opportunity (CESO), an instantaneous optimal energy management strategy for series hybrid electric vehicles , 2017 .

[7]  Jeffrey B. Burl,et al.  Hybrid Electric Vehicle Battery Aging Estimation and Economic Analysis based on Equivalent Consumption Minimization Strategy , 2017 .

[8]  Jeffrey B. Burl,et al.  Prediction of Vehicle Velocity for Model Predictive Control , 2015 .

[9]  Rolf D. Reitz,et al.  Review of high efficiency and clean reactivity controlled compression ignition (RCCI) combustion in internal combustion engines , 2015 .

[10]  Giorgio Rizzoni,et al.  Optimal energy management in series hybrid electric vehicles , 2000, Proceedings of the 2000 American Control Conference. ACC (IEEE Cat. No.00CH36334).

[11]  Osamu Watanabe,et al.  Development of New Gasoline Engine for ACCORD Plug-in Hybrid , 2013 .

[12]  David E. Smith,et al.  Drive cycle simulation of high efficiency combustions on fuel economy and exhaust properties in light-duty vehicles , 2015 .

[13]  Huei Peng,et al.  Supervisory Control of Parallel Hybrid Electric Vehicles for Fuel and Emission Reduction , 2011 .

[14]  Lino Guzzella,et al.  Optimal control of parallel hybrid electric vehicles , 2004, IEEE Transactions on Control Systems Technology.

[15]  Jeffrey B. Burl,et al.  Effects of Time Horizon on Model Predictive Control for Hybrid Electric Vehicles , 2015 .

[16]  Zhiming Gao,et al.  Reactivity Controlled Compression Ignition Drive Cycle Emissions and Fuel Economy Estimations Using Vehicle Systems Simulations with E30 and ULSD , 2014 .

[17]  J. K. Arora,et al.  DESIGN OF REAL-TIME COMBUSTION FEEDBACK SYSTEM AND EXPERIMENTAL STUDY OF AN RCCI ENGINE FOR CONTROL , 2016 .

[18]  Mamoru Tomatsuri,et al.  Development of New 1.8-Liter Engine for Hybrid Vehicles , 2009 .

[19]  Timothy V. Johnson,et al.  Review of diesel emissions and control , 2009 .

[20]  Huei Peng,et al.  Optimal Control of Hybrid Electric Vehicles Based on Pontryagin's Minimum Principle , 2011, IEEE Transactions on Control Systems Technology.

[21]  Jeffrey B. Burl,et al.  Estimation of the ECMS Equivalent Factor Bounds for Hybrid Electric Vehicles , 2018, IEEE Transactions on Control Systems Technology.

[22]  Hamid Reza Karimi,et al.  Robust static output-feedback controller design against sensor failure for vehicle dynamics , 2014 .

[23]  Zoran Filipi,et al.  Hybrid Electric Vehicle Powertrain and Control Strategy Optimization to Maximize the Synergy with a Gasoline HCCI Engine , 2011 .

[24]  Xiaoyong Wang,et al.  An Energy Management Controller to Optimally Trade Off Fuel Economy and Drivability for Hybrid Vehicles , 2012, IEEE Transactions on Control Systems Technology.

[25]  Mahdi Shahbakhti,et al.  Energy Optimization and Fuel Economy Investigation of a Series Hybrid Electric Vehicle Integrated with Diesel/RCCI Engines , 2016 .

[26]  Mahdi Shahbakhti,et al.  Analysis and Control of a Torque Blended Hybrid Electric Powertrain with a Multi-Mode LTC-SI Engine , 2017 .

[27]  Mahdi Shahbakhti,et al.  Fuel consumption assessment of a multi-mode low temperature combustion engine as range extender for an electric vehicle , 2017 .

[28]  Mahdi Shahbakhti,et al.  Modelling and energy management of an HCCI-based powertrain for series hybrid and extended range electric vehicles , 2017 .

[29]  Hamid Reza Karimi,et al.  Optimization and finite-frequency H∞ control of active suspensions in in-wheel motor driven electric ground vehicles , 2015, J. Frankl. Inst..

[30]  Mehran Bidarvatan,et al.  Fuel Economy Benefits of Integrating a Multi-Mode Low Temperature Combustion (LTC) Engine in a Series Extended Range Electric Powertrain , 2016 .

[31]  M. Shahbakhti,et al.  Experimental study of exhaust temperature variation in a homogeneous charge compression ignition engine , 2010 .

[32]  Anna G. Stefanopoulou,et al.  Multimode combustion in a mild hybrid electric vehicle. Part 1: Supervisory control , 2016 .

[33]  Rolf D. Reitz,et al.  Highway Fuel Economy Testing of an RCCI Series Hybrid Vehicle , 2015 .

[34]  M. Shahbakhti,et al.  Characterizing the cyclic variability of ignition timing in a homogeneous charge compression ignition engine fuelled with n-heptane/iso-octane blend fuels , 2008 .

[35]  R. Trigui,et al.  Predictive energy management of hybrid vehicle , 2008, 2008 IEEE Vehicle Power and Propulsion Conference.