An Adaptive, Fuzzy Logic Based Parallel
Hybrid Drivetrain Controller, 03-9132
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Inclusive Dates: 04/01/99 - Current
Background - The motivation for undertaking
this program was driven by the challenge of developing a novel parallel hybrid powertrain
that is robust and reliable. The SwRI-designed hybrid powertrain, with the potential of
increased fuel savings and emissions reduction, is a radical departure from present hybrid
powertrains. The challenge of this project was to design a controller based on adaptive
learning and fuzzy logic to improve fuel economy and emissions without compromising
driveability or vehicle performance.
Approach - The primary objective is to improve
the existing SwRI hybrid powertrain controller, so that it will perform more reliably and
predictably. Applying adaptive controls with fuzzy logic is the key to resolving
driveability concerns of SwRIs present powertrain. The proposed approach consists
first of designing and implementing an adaptive controller for the engine and motor of the
existing SwRI parallel hybrid powertrain. After the hardware implementation of the
adaptive controller, the powertrain will be tested over several driving profiles to ensure
robustness and repeatability. Second, the research team proposes to develop a fuzzy
logic-based supervisory controller that will select and transition the powertrain from one
mode of operation (that is, assist, charge, electric, or regeneration) to another in a
smooth manner, without compromising emissions or driveability or introducing
instabilities. Finally, the team will conduct fuel economy and emissions testing of the
improved drivetrain using expertise available within the Institute.
Accomplishments - In this ongoing project, all
mechanical hardware is in place to initiate powertrain testing. At this time, special
transducers are being wired into the system to facilitate the testing and an adaptive PID
control scheme has been implemented. In the near future, the team plans on testing this
adaptive scheme and refining it to optimize fuel efficiency and emissions.
This dynamometer test stand was used to
validate and test the parallel hybrid powertrain.
Lubricants, and Vehicle Systems Program
1999 IR&D Home