Comparing Dynamic Programming Optimal Control Strategies for a Series Hybrid Drivetrain
Paper i proceeding, 2017

A two-state forward dynamic programming algorithm is evaluated in a series hybrid drive-train application with the objective to minimize fuel consumption when look-ahead information is available. The states in the new method are battery state-of-charge and engine speed. The new method is compared to one-state dynamic programming optimization methods where the requested generator power is found such that the fuel consumption is minimized and engine speed is given by the optimum power-speed efficiency line. The other method compared is to run the engine at a given operating point where the system efficiency is highest, finding the combination of engine run requests over the drive-cycle that minimizes the fuel consumption. The work has included the engine torque and generator power as control signals and is evaluated in a full vehicle-simulation model based on the Volvo Car Corporation VSIM tool. Lowest fuel consumption is obtained by the new two-state method, with 12 % less fuel consumed compared to operating the engine in the system efficiency sweet spot.

Optimal Control

Energy Efficiency

Dynamic Programming (DP)

Hybrid Electric Vehicles

Series Hybrid

Författare

Rickard Arvidsson

Signaler och system, Signalbehandling och medicinsk teknik, Signalbehandling

Chalmers, Tillämpad mekanik, Förbränning

Tomas McKelvey

Chalmers, Signaler och system

SAE Technical Papers

0148-7191 (ISSN)

Drivkrafter

Hållbar utveckling

Styrkeområden

Transport

Energi

Ämneskategorier

Farkostteknik

Inbäddad systemteknik

Reglerteknik

DOI

10.4271/2017-01-2457