Optimizing Hybrid Vehicles via Route Prediction jon froehlich & john krumm HCI Intern Talk July 26 th, 2007.

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Presentation transcript:

Optimizing Hybrid Vehicles via Route Prediction jon froehlich & john krumm HCI Intern Talk July 26 th, 2007

U.S. Department of Energy, u.s. gas prices

global gas prices U.S. Department of Energy,

CO 2 emissions (2003) 2003 United Nations Statistics Division

u.s. oil demand by sector U.S. Department of Transportation,

International Energy Agency

why hybrids? U.S. Department of Energy,

how hybrids work series Combustion Engine parallel Combustion Engine

at low speeds

highway cruising

heavy acceleration

engine idling

regenerative braking

what if we could predict a driver’s route? road graderoad curvaturetraffic conditions

HEV Charge/Discharge Control System Based on Navigation Information Convergence Transportation Electronics Association 2004 Nissan Motor Company road gradetraffic conditions

Predestination: Inferring Destinations from Partial Trajectories Ubiquitous Computing 2006 John Krumm and Eric Horvitz Trip starts, uniform destination probability 4 squares south, half of region eliminated More squares in trip, ¾ of region eliminated

msmls dataset As of today 251 subjects 2,131,440 data points UbiComp subjects 1,351,669 points 73,903 miles 9414 trips

predestination for routes? gps massaging route segmentation route comparison route periodicity (recurrence) route prediction

gps massaging Breaking the sound barrier (and all other sorts of physical feats) on the way to work GPS can be noisy

route recurrence And they often have a temporal pattern: 8 of the 9 trips along this route occurred between 8:00 & 9:30AM Yes, people do drive the exact same routes over and over again

route profiles

evaluation stage 1 Mine the MSMLS dataset Check our route prediction algorithm Check our deceleration prediction algorithms stage 2 Create (or purchase) hybrid simulator Dynamically shift power train policies Compare with baseline Evaluate based on better electrical motor utilization, state of charge, and fuel economy

contributions Predicting speed, acceleration (and deceleration), and elevation along route Automatic route prediction Studying effect of route prediction and dynamic power train policies through simulation

questions? comments? other ideas?