Automotive

Fuel Cell Modeling With dSPACE And OPAL-RT Real Time Platforms

Publication date : Jul 2014
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Author(s)

Elena, Breaz, ao Fei; Paire Damien; Tirnovan Radu,

Abstract

This paper presents the real time modeling of a proton exchange membrane fuel cell stack using two different real time platforms: RT-LAB and dSPACE. Simulation results are compared with a 500 W fuel cell and show very good agreement with experimental results. The model is suitable for real time simulation which is a key issue in many applications such as hardware in the loop applications (HIL). Indeed, such simulator associated with a power supply, constitute a fuel cell emulator. It can be used in order to do tests in automotive applications. Using the fuel cell emulator, the hydrogen consumption is equal to zero, therefore the cost is reduced.

A Novel Bi-directional DC/AC Stacked Matrix Converter Design for Electrified Vehicle Applications

Publication date : Jul 2014
Paper File : Not available yet

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Author(s)

S. M. Mousavi, S. Hamidifar, Narayan C. Kar,

Abstract

In the rapidly growing field of electrified transportation technology, electric and hybrid electric vehicle manufacturers place increasing demands on the designers to improve the efficiency and reduce the costs of vehicle components in order to sustain a niche in the electrified vehicle market. Understanding the significance and challenges in an efficient and economical drive-train design, this research manuscript presents a part of an ongoing project that aims at developing a comprehensive study on DC/AC drive motor technology in electric vehicle (EV) application. In this paper, a new three-level three-phase matrix converter topology along with two conventional frequently used three-level three-phase DC/AC converter topologies, namely diode clamped, and H-bridge converters are implemented. Furthermore, comprehensive analysis and comparative studies are conducted to examine the performance and efficiency of these converter topologies according to electrified vehicle design criteria. In addition, experimental investigations are carried out on the aforementioned converter configurations to help the EV designers choose the most suitable converter topology.

Designing a set of efficient regenerative braking strategies with a performance index tool

Publication date : Jun 2014
Paper File : Not available yet

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Author(s)

Philippe Micheau, Maxime Boisvert, Didier Mammosser,

Abstract

The goal of this study is to design efficient regenerative braking strategies for a recreational three-wheel rear-wheel-drive hybrid electric vehicle. Current studies provide several optimal regenerative braking strategies, but no tool to obtain a set of acceptable strategies. A performance index tool is thus proposed and used to evaluate the efficiency of a given strategy. With this tool it is then possible to define a set of efficient regenerative strategies. The performance index is based on knowledge of a global efficiency map defined as the ratio of the incoming battery power to the extracted kinetic power. Two simulators of the vehicle are implemented in MATLAB/Simulink: one with a rear-wheel slip model and the other without slip considerations. They also include the longitudinal dynamics of the vehicle and the efficiency of the electrical drive from the electric motor to the battery. They were validated with experimental measurements of several accelerations and decelerations on a dry asphalt road from 0 km/h to 60 km/h. The simulated global efficiency map was also experimentally validated by regenerative braking measurements on a dry asphalt road from 50 km/h to 0 km/h. The simulated global efficiency map is used to design the optimal strategy (with and without wheel slip considerations). The performance map deduced from the global efficiency map was used to define the boundaries for the optimal strategy deviations and hence to limit the regenerated energy drop. Simulations show that there is a wide range of acceptable strategies from 0 km/h to 50 km/h on a dry asphalt road and hence give the driver the possibility of modulating the regenerative braking within a good energy recapture level. Finally, the design methodology presented with a simulated global efficiency map is also applicable with an experimental efficiency map which can be updated online.

Resonant harmonic elimination PWM based high-frequency resonance suppression of high-speed railways

Publication date : Jun 2014
Paper File : Resonant Harmonic Elimination PWM Based High-frequency Resonance Suppression of High-speed .pdf



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Author(s)

Hengbin Cui, Wensheng Song, Hui Fang, Xinglai Ge, Xiaoyun Feng,

Abstract

High-frequency resonances occur frequently and severely disrupt the normal high-speed railway operation in China. In this paper, the resonance mechanism, which indicates that the composited pulse voltage of the multiple four-quadrant converters in the train’s traction drive system is the harmonic source, was firstly introduced. Then in order to eliminate the resonant harmonics in the source, the resonant harmonic elimination PWM (RHEPWM) was proposed to be applied in the traction drive system. The target function for the optimal commutating angles and the decision of the initial commutating angles were presented, and the optimal commutating angles were resolved by the rolling Levenberg-Marquardt (LM) method. Finally, the experimental verification was implemented with a RT-Lab simulator and the performance before and after the application of the RHEPWM was compared. The results verify that the RHEPWM not only has the capacity to suppress resonances, but also improves the total power factor and mitigates the distortion in the pantograph current.

Find the simple way through complex or sensitive projects

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As action without planning is fatal, project management is the train engine that moves the organization forward. Managing innovative projects efficiently is an art mastered by OPAL-RT; we’ll either find a way, or make one.

May 30, 2014 - Montreal, Quebec

RT-LAB 11: Engineering the future of real-time simulation

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From concept to completion - when dreams finally meet reality with the new RT-LAB 11 – Coming soon!

May 28, 2014 - Montreal, Quebec

World experts in real time simulation will be joining in Montreal for the Real-Time 2014 conference from June 9th to 12th, 2014

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OPAL-RT, a Montreal company that is the world leader in real-time simulation, is organizing the 7th edition of this major event for the engineering world.

May 1, 2014 - Montreal, Quebec

Robutness analysis of ESC ECU to characteristic variation of vehicle chassis components using HILS technique

Publication date : Mar 2014
Paper File : Not available yet

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Author(s)

J. J. KWON, T. W. HONG, K. PARK, S. J. HEO, K. W. LEE, W. W. KIM, H. C. KOO and M. B. PARK,

Abstract

The ESC system, since its introduction in the mid 90s, has greatly contributed to prevention of vehicle accidents with its capability of maintaining vehicle stability in severe driving conditions. Due to its significant advantages, many nations are now adopting regulations that mandate installation of the ESC system in all classes of passenger vehicles – from mini to luxury. Accordingly it became important to know whether an ESC ECU can yield good performance on a wide range of vehicle parameter changes. In this paper, robustness analysis was conducted to study how characteristic variation of the main chassis components affect the performance of the ESC ECU. This analysis was carried out using a HILS system built on an actual ESC ECU. The variation range of each chassis component was carefully selected considering the component’s design criteria adopted in automotive industries. Based upon the robustness analysis results, the allowable variation ranges of the chassis components for ensuring sound performance of an ESC ECU were proposed.

Minor release RT-LAB 10.7.1 with new features and bug fixes

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Following the feedback of its customers, OPAL-RT launched an update to its RT-LAB simulation software this week. RT-LAB 10.7.1 enables new features and major bug fixes.

March 14, 2014 - Montreal, Quebec
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