Fuel
Economy and Emission Optimization for Hybrid Electric Truck
Department of
Mechanical Engineering
University of Michigan
Hybrid vehicle techniques are widely
studied recently because of their potential to significantly improve the fuel
economy and drivability of future ground vehicles. Due to the dual-power-source nature of these vehicles,
control strategies based on engineering intuition frequently fail to fully
explore the potential of these advanced vehicles. In this paper, we will present a procedure for the design of
a near-optimum power management strategy.
The design procedure starts by defining a cost function, such as
minimizing fuel consumption and selected emission species. The Dynamic Programming (DP) techniques
are then utilized to find the optimal control actions. Through analysis of the behavior of the
DP control actions, sub-optimal rules are extracted, which, unlike DP control
signals, are implementable. The
performance of the power management control strategy is verified by using the
hybrid vehicle model HE-VESIM developed at the Automotive Research Center of
the University of Michigan. A trade-off study between fuel economy and
emissions was performed. It was found
that significant emission reduction can be achieved at the expense of small
increase in fuel consumption.
Friday, November 1,
2002
3:30 – 4:30
p.m.