Imperial College London

DrSimosEvangelou

Faculty of EngineeringDepartment of Electrical and Electronic Engineering

Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 6285s.evangelou Website

 
 
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Location

 

1108BElectrical EngineeringSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

52 results found

Arana C, Evangelou SA, Dini D, 2017, Series Active Variable Geometry Suspension application to comfort enhancement, CONTROL ENGINEERING PRACTICE, Vol: 59, Pages: 111-126, ISSN: 0967-0661

JOURNAL ARTICLE

Evangelou SA, Rehman-Shaikh MA, 2017, Hybrid electric vehicle fuel minimization by DC-DC converter dual-phase shift control, CONTROL ENGINEERING PRACTICE, Vol: 64, Pages: 44-60, ISSN: 0967-0661

JOURNAL ARTICLE

Roche M, Shabbir W, Evangelou SA, 2017, Voltage Control for Enhanced Power Electronic Efficiency in Series Hybrid Electric Vehicles, IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, Vol: 66, Pages: 3645-3658, ISSN: 0018-9545

JOURNAL ARTICLE

Yu M, Evangelou SA, Dini D, 2017, Model Identification and Control for a Quarter Car Test Rig of Series Active Variable Geometry Suspension, 20th IFAC World Congress, Publisher: Elsevier, ISSN: 1474-6670

In this paper, a quarter car test rig is utilized to perform an experimental study of the singlelinkvariant of the Series Active Variable Geometry Suspension (SAVGS). A nonlinear model of the testrig is identified with the use of a theoretical quarter car model and the rig’s experimental frequencyresponse. A linear equivalent modeling method that compensates the geometric nonlinearity is alsoadopted to synthesize an H-infinity control scheme. The controller actively adjusts the single-linkvelocity in the SAVGS to improve the suspension performance. Experiments are performed to evaluatethe SAVGS practical feasibility, the performance improvement, the accuracy of the nonlinear model andthe controller’s robustness.

CONFERENCE PAPER

Arana C, Evangelou SA, Dini D, 2016, Series Active Variable Geometry Suspension Application to Chassis Attitude Control, IEEE-ASME TRANSACTIONS ON MECHATRONICS, Vol: 21, Pages: 518-530, ISSN: 1083-4435

JOURNAL ARTICLE

Evangelou SA, Shabbir W, 2016, Dynamic modeling platform for series hybrid electric vehicles, 8th IFAC Symposium on Advances in Automotive Control (AAC), Publisher: ELSEVIER SCIENCE BV, Pages: 533-540, ISSN: 2405-8963

CONFERENCE PAPER

Shabbir W, Evangelou SA, 2016, Exclusive Operation Strategy for the Supervisory Control of Series Hybrid Electric Vehicles, IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, Vol: 24, Pages: 2190-2198, ISSN: 1063-6536

JOURNAL ARTICLE

Arana C, Evangelou SA, Dini D, 2015, Series Active Variable Geometry Suspension for Road Vehicles, IEEE-ASME TRANSACTIONS ON MECHATRONICS, Vol: 20, Pages: 361-372, ISSN: 1083-4435

JOURNAL ARTICLE

Cheng C, Evangelou SA, Arana C, Dini Det al., 2015, Active variable geometry suspension robust control for improved vehicle ride comfort and road holding, American Control Conference, Publisher: IEEE, Pages: 3440-3446, ISSN: 0743-1619

CONFERENCE PAPER

Das HB, Evangelou SA, Dhinagar SJ, 2015, An objective analysis of drivability for two wheeler powertrain with control oriented dynamic model, Pages: 292-299, ISSN: 1474-6670

© 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.. The objective of this work is to estimate drivability characteristics parameters of two wheeler powertrain with control oriented powertrain model. The evaluation is essential for defining drivability characteristics for a future electric variable transmission (EVT) powertrain. The mathematical model for the complete powertrain is developed using suitable modeling approaches for the different sub-modules of the complete system. The Spark Ignition (SI) engine model used for this work is developed from mean value model approach and experimentally validated with test data from TVS Motor Company, India. The model is integrated with two types of transmission models, Continuous Variable Transmission (CVT) and Manual Transmission (MT). It simulates dynamic power-flow from the engine to wheel for analyzing longitudinal drivability of the vehicle for both powertrain configurations. It is proposed that the drivability can be measured with certain parameters which show good correlation with subjective assessments for vehicle launch as well as tip in condition. The objective assessment of both types of powertrains is performed using the above mentioned powertrain models. The results of the simulation for drivability tests are discussed in this paper.

CONFERENCE PAPER

Das HB, Evangelou SA, Jabez Dhinagar S, 2015, An Objective Evaluation of Characterisation Matrix for Two Wheeler Powertrain with Control Oriented Mathematical Model

Copyright © 2015 SAE International. The objective of this paper is to estimate characteristics parameters of two wheeler powertrain with simulated vehicle model. The evaluation is applied to define required characteristics for future motor integrated powertrain. The main parameters for the characteristics matrix are Fuel consumption and NOx gas emission. In the 1st phase of work, a mathematical model for the complete powertrain is developed using suitable modelling approach for different sub-modules of the complete system. The objectives of the model are, to simulate dynamic power-flow from the engine to wheel and to simulate NOx gas emission. The powertrain model consists of a carburetted spark ignition (S.I) engine and gear transmission system. The S.I engine model is capable of simulating dynamic torque output of engine as well as the NOx gas emission. The model is experimentally compared with available test data of production ready engine from TVS Motor Company, India. The dynamic effects of change of ignition timing and fueling on torque output and NOx gas emissions are simulated based on this model and discussed on the paper. The paper adapted two types of transmission model, one with Continuous Variable Transmission (CVT) and other one with Fixed Geared Transmission. The mathematical model for the CVT system is developed to capture automatic gear shift actuation and power transfer to the wheel. The model simulates the toque control system of the driven pulley as well as speed control system of the drive pulley. The mathematical model for the fixed gear ratio system with wet clutch system is proposed to simulate the manual gear based powertrain. The above mentioned model demands computationally intensive resources due to presence of higher order dynamics, mathematical discontinuity and non-linear functions. So this model is not suitable for control design application. In 2nd phase of work, the model is converted to lower complexity control oriented model

CONFERENCE PAPER

Meisel J, Shabbir W, Evangelou SA, 2015, Control of PHEV and HEV Parallel Powertrains Using a Sequential Linearization Algorithm

Copyright © 2015 SAE International. Using measurable physical input variables, an implementable control algorithm for parallel architecture plug-in and non-plug-in hybrid electric vehicle (PHEV and HEV) powertrains is presented. The control of the electric drive is based on an algebraic mapping of the accelerator pedal position, the battery state-of-charge (SOC), and the vehicle velocity into a motor controller input torque command. This mapping is developed using a sequential linearization control (SLC) methodology. The internal combustion engine (ICE) control uses a modified accelerator pedal to throttle plate angle using an adjustable gain parameter that, in turn, determines the sustained battery SOC. Searches over an admissible control space or the use of pre-defined look-up tables are thus avoided. Actual on-road results for a Ford Explorer with a through-the-road (TTR) hybrid powertrain using this control methodology are presented. In addition, Matlab-based simulation results for PHEVs and HEVs using this single control algorithm are presented employing a model of the Explorer. These results show the gasoline consumption and SOC over 48 repeated cycles of three common driving schedules. Further studies of acceleration performance illustrate the trade-off of minimizing gasoline consumption vs. higher performance using more gasoline. All-electric range (AER) vs. battery capacity is also presented as well as the fuel consumption and final SOC for two PHEV control strategies.

CONFERENCE PAPER

Thommyppillai M, Evangelou S, Sharp RS, 2015, Towards a practical virtual racing-car driver, Pages: 4943-4948

© 2009 EUCA. Fundamental approaches to modelling the control of a car by a driver are reviewed briefly. The context of the work presented is explained. Then, previous research on the application of optimal linear preview control to aspects of driving road vehicles is extended. This prior research treated the tracking of a roadway by a vehicle and driver at constant forward speed and the tracking of a speed demand while running straight. The two previously separate problems are combined, so that longitudinal and lateral path demands are considered in parallel. A new feature is that low-pass filters are included in the driver modelling, to represent driver bandwidth limitations. This feature enables the finding of the influence of the driver's control bandwidth on the optimal strategies. A new optimal preview control toolbox is employed for the computations. A simulation of the virtual driver-controlled car is shown to demonstrate the closed-loop system following longitudinal and lateral position demands.

CONFERENCE PAPER

Arana C, Evangelou SA, Dini D, 2014, Car attitude control by series mechatronic suspension, 19th World Congress of the International-Federation-of-Automatic-Control (IFAC), Publisher: ELSEVIER SCIENCE BV, Pages: 10688-10693, ISSN: 2405-8963

CONFERENCE PAPER

Evangelou SA, Tomas-Rodriguez M, 2014, Motorcycle Dynamic Modes and Passive Steering Compensation, Modelling, Simulation and Control of Two-Wheeled Vehicles, Pages: 221-241, ISBN: 9781118536391

© 2014 John Wiley & Sons, Ltd. All rights reserved. This chapter introduces the main characteristics of motorcycle oscillatory modes and then discusses how their damping can be increased by employing steering compensation. Weave mode is a fishtailing-type motion involving yaw and roll of the motorcycle body and steering system oscillations. Wobble mode is a steering oscillation that is reminiscent of the supermarket cart front-wheel caster shimmy. The chapter describes a high-fidelity motorcycle model that is used to illustrate quantitatively the characteristics of the oscillatory modes and the influence of steering damping on machine stability. A mathematical model is used to analyse and illustrate the behaviour of motorcycles. This model takes into account the aerodynamic forces and moments, which are proportional to the square of the speed. The chapter explains a design methodology for steering compensation that improves modal damping. Finally, it provides an analysis of burst oscillations followed by a design of steering compensation to suppress these oscillations.

BOOK CHAPTER

Shabbir W, Evangelou SA, 2014, Real-time control strategy to maximize hybrid electric vehicle powertrain efficiency, APPLIED ENERGY, Vol: 135, Pages: 512-522, ISSN: 0306-2619

JOURNAL ARTICLE

Shabbir W, Evangelou SA, 2014, Efficiency analysis of a continuously variable transmission with linear control for a series hybrid electric vehicle, 19th World Congress of the International-Federation-of-Automatic-Control (IFAC), Publisher: ELSEVIER SCIENCE BV, Pages: 6264-6269, ISSN: 2405-8963

CONFERENCE PAPER

Thommyppillai M, Evangelou S, Sharp RS, 2014, Towards a practical virtual racing-car driver, Pages: 4943-4948

© 2009 EUCA. Fundamental approaches to modelling the control of a car by a driver are reviewed briefly. The context of the work presented is explained. Then, previous research on the application of optimal linear preview control to aspects of driving road vehicles is extended. This prior research treated the tracking of a roadway by a vehicle and driver at constant forward speed and the tracking of a speed demand while running straight. The two previously separate problems are combined, so that longitudinal and lateral path demands are considered in parallel. A new feature is that low-pass filters are included in the driver modelling, to represent driver bandwidth limitations. This feature enables the finding of the influence of the driver's control bandwidth on the optimal strategies. A new optimal preview control toolbox is employed for the computations. A simulation of the virtual driver-controlled car is shown to demonstrate the closed-loop system following longitudinal and lateral position demands.

CONFERENCE PAPER

Evangelou SA, Arana C, Shabbir W, Shukla Aet al., 2013, Method and Apparatus for Power Source Control

PATENT

Evangelou SA, Limebeer DJN, Tomas-Rodriguez M, 2013, Suppression of Burst Oscillations in Racing Motorcycles, JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME, Vol: 80, ISSN: 0021-8936

JOURNAL ARTICLE

Lot R, Evangelou SA, 2013, Lap Time Optimization of a Sports Series Hybrid Electric Vehicle, World Congress on Engineering (WCE 2013), Publisher: INT ASSOC ENGINEERS-IAENG, Pages: 1711-+, ISSN: 2078-0958

CONFERENCE PAPER

Lot R, Evangelou SA, 2013, Green Driving Optimization of a Series Hybrid Electric Vehicle, 2013 IEEE 52ND ANNUAL CONFERENCE ON DECISION AND CONTROL (CDC), Pages: 2200-2207, ISSN: 0743-1546

JOURNAL ARTICLE

Meisel J, Shabbir W, Evangelou SA, 2013, A Practical Control Methodology for Parallel Plug-In Hybrid Electric Vehicle Powertrains, 9th IEEE Vehicle Power and Propulsion Conference (VPPC), Publisher: IEEE, Pages: 30-35, ISSN: 1938-8756

CONFERENCE PAPER

Meisel J, Shabbir W, Evangelou SA, 2013, Evaluation of the through-the-road architecture for plug-in hybrid electric vehicle powertrains, 2013 IEEE International Electric Vehicle Conference, IEVC 2013

This paper investigates the through-the-road (TTR) powertrain architecture and its suitability for plug-in hybrid-electric vehicles (PHEVs) in the passenger vehicle category. The advantages and disadvantages of this architecture with respect to cost, sizing, control and manufacturability are contrasted against those of conventional architectures. The comparison extends into powertrain configurations used in recent commercial vehicles, such as the Toyota Prius and the Chevrolet Volt. The research includes the characterization of the mechanical dynamics and constraint equations of each architecture to quantify the control requirements. It is found that the TTR architecture excels in terms of manufacturability, and its ability to blend the motor and engine torques independently. © 2013 IEEE.

JOURNAL ARTICLE

Arana C, Evangelou SA, Dini D, 2012, Pitch angle reduction for cars under acceleration and braking by active variable geometry suspension, 51st IEEE Annual Conference on Decision and Control (CDC), Publisher: IEEE, Pages: 4390-4395, ISSN: 0743-1546

CONFERENCE PAPER

Evangelou SA, Dini D, De Meerschman O, Tocatlian A, Kneip C, Palas Cet al., 2012, Variable-geometry suspension apparatus and vehicle comprising such apparatus

PATENT

Evangelou SA, Shukla A, 2012, Advances in the modelling and control of series hybrid electric vehicles, American Control Conference (ACC), Publisher: IEEE COMPUTER SOC, Pages: 527-534, ISSN: 0743-1619

CONFERENCE PAPER

Ramirez CM, Tomas-Rodriguez M, Evangelou SA, 2012, Dynamical analysis of a duolever suspension system, Pages: 1106-1111

The authors investigate the dynamical behaviour of a Duolever type of suspension on a standard sports motorcycle. The paper contains the modelling aspects of it, as well as the optimization process followed in order to obtain the suspension parameters and geometry arrangements. Head angle, wheelbase and normal trail are studied as indicators of the handling properties of the suspension system. Matlab optimization toolbox was used to design a mathematical model of a duolever front suspension system which keeps its normal trail constant during the full suspension travel. By using VehicleSim software, non-linear simulations were performed on motorcycle model that includes a duolever suspension. By a quasi-static variation of the forward speed of the motorcycle, the time histories of the system's states were obtained. The corresponded root locus to the linearized model were plotted and compared to those of the original motorcycle model without duolever system. A modal analysis was performed in order to get a deeper understanding of the different modes of oscillation and how the duolever system affects them. The results show that whilst a satisfactory anti-dive effect is achieved with this suspension system, it has a destabilizing effect on pitch and wobble modes. © 2012 IEEE.

CONFERENCE PAPER

Shabbir W, Arana C, Evangelou SA, 2012, Series hybrid electric vehicle supervisory control based on off-line efficiency optimization

A supervisory control system (SCS) is developed for a dynamic model of a series hybrid electric vehicle. The powertrain steady-state behavior is analyzed to produce a control map offline which maximizes the vehicle energy efficiency for any driving condition. This map can be accessed on a real-time basis during driving at low computational cost to locally optimize efficiency. The vehicle transient response is considered to ensure efficient, stable and healthy operation. Simulations using standard drive cycles verify that the designed Efficiency Maximizing Map (EMM) control allows smoother operation of the powertrain and it brings reductions in fuel consumption as compared to a Thermostat control scheme. © 2012 IEEE.

CONFERENCE PAPER

Shabbir W, Evangelou SA, 2012, Efficiency Maximizing and Charge Sustaining Supervisory Control for Series Hybrid Electric Vehicles, 51st IEEE Annual Conference on Decision and Control (CDC), Publisher: IEEE, Pages: 6327-6332, ISSN: 0743-1546

CONFERENCE PAPER

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