Mohammad Saadat - Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
Mohsen Esfahanian - Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran.

Reducing the fuel consumption and energy use in transportation systems are the active research areas in recent years. This paper considers the repetitive mission of the intercity passenger buses as a case for fuel reduction. A look-ahead energy management system is proposed which uses the information about the geometry and speed limits of the road ahead. This data can be extracted using road slope and speed limits database in combination with a GPS unit. A fuzzy gain scheduling algorithm is proposed to improve the performance of the look-ahead control. The road slope and speed limit specifications called road pattern can define some two dimensional regions. The main parameters of the proposed fuzzy look-ahead controller are optimized in each region using the genetic algorithm.  The final output of the proposed controller is the desired speed that regularly is fed to the conventional cruise controller with new set points. The simulation results of the proposed energy management system show that the fuel consumption is significantly reduced.

Fuel consumption Journey time Look-ahead control Fuzzy gain scheduling