چكيده به لاتين
Abstract:
Hybrid electric vehicles (HEV) with combination of an internal combustion engine and an electric motor are proposed as a solution for pollutants problems and optimization of fuel consumption. Plug-in hybrid electric vehicles (PHEV) are new generation of HEV types, capable of charging batteries through electric grid. Regarding to significance of traffic and driving data development and its role in energy sources management of a PHEV, the main objective of this thesis is development and application of traffic data and driving cycle for fuzzy energy management system.
In this thesis, driving cycle development is firstly studied. Pattern recognition is then studied with a review on previous experiments, and a novel algorithm is presented to build the driving cycle. Accordingly, traffic data in the city of Tehran is collected with the concentration on traffic peak hours for passenger cars. In the proposed algorithm for driving cycle development, real data are converted to micro-trips (data between two consecutive stops) and have been divided into four traffic conditions using K-means clustering method. Sample micro-trips are then selected for each traffic condition employing probability distribution function. In addition, transition or sequence of occurrence between micro-trips of traffic condition has applied on cycle using Markov chain model and finally, Tehran driving cycle is developed.
To apply developed traffic data in control strategy, a proper fuzzy controller is designed for PHEV and simulated in Matlab and ADVISOR software environment. In order to tune the fuzzy rules, the equivalent fuel consumption and the amount of vehicle exhaust emission are then optimized using GA, while keeping operational capabilities.
The results of fuzzy controller simulation for Tehran new driving cycle have shown reduced fuel consumption up to 18% compared to Tehran previous driving cycle considering various traffic conditions. This indicates higher efficiency of hybrid electric vehicles in traffic peak hours. This optimized genetic-fuzzy controller may result in more reduction in fuel consumption depending on the distance variation.
Keywords: plug-in hybrid electric vehicle, driving cycle development, field data gathering, control strategy.