Publications

A selection of publications from these research areas is listed below.


Performance evaluation of series hybrid and pure electric vehicles using lead-acid batteries and supercapacitors

Infante, W.F.; Khan, A.F. ; Libatique, N.J.C. ; Tangonan, G.L. ; Uy, S.N.Y.

TENCON 2012 - 2012 IEEE Region 10 Conference 19-22 Nov. 2012 ISSN : 2159-3442 Print ISBN: 978-1-4673-4823-2

 
The adoption of pure electric and hybrid electric vehicles for public transportation poses a number of issues. In this paper, we simulate the implications of series hybrid- and pure electric- vehicles employing Pb acid battery-supercapacitor combinations. Our simulations suggest that peak fuel consumption is lessened to 31.3 percent in series hybrid electric vehicles when lead-acid batteries are coupled with supercapacitors compared to a system using batteries alone. Voltage fluctuations are reduced from 52 V difference to 1 V difference as the short transients are off-loaded to the supercapacitors. By altering the values for battery capacity, vehicle weight, and capacitance, the simulation suggests optimal operation ranges for targeted designs. In parts of the simulation, we took Metro Manila Jeepney drive cycle data characterized by frequent stop-and-start conditions and compared these to regularized routes travelling the same distance: the regularized drive cycles resulted in less battery parameter fluctuation for both models and less fuel consumption for the SHEV model with a value of 30.2 percent. The regularized route drive cycle needed lower-valued supercapacitors from 1700 F to 1000 F to produce the same performance. In addition, new driving cycles were also generated in NetLogo based on traffic policy assumptions.

Digital Object Identifier : 10.1109/TENCON.2012.6412224 (Download Full Text PDF Here)

 

 

 

 

 


Multi-agent Behavioral Modeling of Traffic Applied to E-Jeepneys

2013 Final Year Report, B.Sc. Thesis

A. T. Ferma, R. M. Mojica, J. B. Polidario, C. B. Tan, C. M. Oppus, N. C. Libatique, G. L. Tangonan, W. F. Infante, S.Y. Uy

There has been an increased interest in Series Hybrid Electric vehicles as an alternative form of public transportation in the Philippine setting due to low emission count compared to conventional vehicles, and the need to lessen the dependency on fossil fuels. E-Jeepneys in particular are not new, however because of the aggressive nature of urban traffic in the country, such as aggressive lateral movements and abrupt stopping, there is difficulty in the implementation of E-Jeepneys as a viable, long-term form of public transport. This research delves into the development of various traffic policies that optimizes the capabilities of a Series Hybrid Electric Jeepney in the Philippine urban traffic, through the use of Multi-Agent Based modeling via NetLogo, an Agent-Based modeling software. The traffic simulation outputs passenger throughput over the duration of the simulation time, as well as, the drive cycle of the E-Jeepney. The drive cycle output is filtered of unrealistic spikes and becomes input into a Series Hybrid Electric vehicle simulation in MATLAB where the efficiency plots of fuel consumption are produced. The results of the simulation suggests that a configuration of fixed stops and an exclusive lane for E-Jeepneys gives the most optimized result for both fuel consumption, passenger throughput and overall traffic flow, as there is a substantial decrease in both aggressive lane changing and random abrupt stopping.

 

 

 

 

 

 


Battery performance and management system of e-vehicles in the Philippines: towards an improved energy management

Infante, W.F.;  Uy, S.N.Y.; Libatique, N.J.C. ; Tangonan, G.L. 

6th Engineering Research and Development for Technology: Addressing the Grand Challenges Through Engineering Innovations 

As hybrid electric vehicles and electric vehicles rise in the international market as well as localized versions such as e-Jeepneys and e-Tricycles, their feasibility as future transport system becomes significant. Part of the deciding factor is the storage system and thus, it is imperative to have an energy management system for electric vehicles in the Philippines. Dual-source storage system (lead acid batteries and supercapacitors) has been of research interest because of their capability of handling voltage spikes and still have stable open circuit voltage; however, current deployments of e-tricycles in the Philippines only provide lead-acid batteries as their battery source. Aside from this, mainstream monitoring of the batteries only observe open circuit voltage but other state parameters are needed such as the state of charge, state of health, and temperature variation for better feedback. The proposed research presents a more pragmatic way of monitoring the energy management system through the evaluation of dual-source systems and inclusion of additional parameters such as temperature for e-vehicle battery monitoring in the Philippines. Simulations using Simulink in MATLAB suggests that hybrid system can improve the efficiency of vehicles in stop-start conditions. A lookup table has also been proposed for dynamic battery diagnostic testing of e-vehicles for additional performance tests such as two-pulse load tests for finding the state of health. 

 

 

 

 

 


Hybrid-electric vehicle designed for slow, start/stop, low-gear driving in heavy traffic conditions in Manila

Calasanz, T.; Tangonan, G.; Uy, S.; Villarin, J. 

Vehicle Power and Propulsion, 2005 IEEE Conference 7-9 Sept. 2005 Print ISBN: 0-7803-9280-9

This HEV is designed to improve the overall thermal efficiencies of passenger utility vehicles that operate under heavy traffic conditions in the streets of Manila. The system is scalable from a small "passenger tricycle" to a passenger bus and may be considered as a retrofit system to existing vehicles.

Digital Object Identifier : 10.1109/VPPC.2005.1554606 (Download Full Text PDF Here)

 

 

 

 

 


Hybrid Electric Simulations and Prototype Development for Stop and Go Traffic Conditions 

MSc Thesis, Ateneo de Manila University, 2005 

Uy, S.

 
This study deals with the simulation of hybrid electric vehicles and contributes to the development of a combined hybrid electric vehicle prototype for heavy traffic conditions of Metro Manila. Hybrid electric vehicles are a potential method in lessening emissions from transportation and improving fuel economy of vehicles. The Quasi-Static Simulation Toolbox is used for modeling vehicles. Development for the combined hybrid electric vehicle is focused on the variable frequency inverter (VFI) module. It is found that hybrid electric vehicles can lead to better fuel efficiency in simulations. The variable frequency inverter has been modified and tested to run the prototype vehicle.