Testing of connected Eco-Approach and Departure (EAD) algorithm.
To improve the energy efficiency of diesel trucks conducting drayage operations a connected Eco-Approach and Departure (EAD) system was developed to limit unnecessary idling or speed fluctuation as trucks approach and pass through intersections.
The proposed system included two models: a powertrain model designed to simulate performance of a truck diesel engine and 6-speed transmission as regulated by an on-board electronic control unit (ECU), and a trajectory planning model designed to use SPaT messages and roadway trajectory information to determine the most fuel efficient route based on an assessment of intersection arrival times and power train energy consumption required for drayage operations.
A shortest path equation and data set reflecting truck performance in drayage traction mode were used to generate an engine fuel consumption map and estimate energy consumption. Simulations emulated performance at pre-timed signalized intersections with varying entry times and speeds.
The average energy saved compared to a baseline condition was 7.1 percent for level terrain, 4.4 percent for uphill terrain, and 8.1 percent for the downhill case.