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research-article

HYBRID-ELECTRIC TURBOCHARGER AND HIGH-SPEED SIC VARIABLE-FREQUENCY DRIVE USING SENSORLESS CONTROL ALGORITHM

[+] Author and Article Information
Andrew L. Carpenter

Mainstream Engineering Corporation Rockledge, Florida, USA
acarpenter@mainstream-engr.com

Troy L. Beechneer

Mainstream Engineering Corporation Rockledge, Florida, USA
tbeechner@mainstream-engr.com

Brian E. Tews

Mainstream Engineering Corporation Rockledge, Florida, USA
bet@mainstream-engr.com

Paul E. Yelvington

Mainstream Engineering Corporation Rockledge, Florida, USA
pyelvington@mainstream-engr.com

1Corresponding author.

ASME doi:10.1115/1.4040012 History: Received February 20, 2018; Revised March 26, 2018

Abstract

Electrically-assisted engine boosting systems lend themselves to better throttle response, wider effective operating ranges, and can provide the ability to extract excess energy during deceleration and high-load events (and store it in a vehicle’s onboard batteries). This can lead to better overall vehicle performance, emissions, and efficiency while allowing for further engine downsizing and increased power density. A hybrid-electric turbocharger, variable-frequency drive (VFD), and novel sensorless control algorithm has been developed. An 11kW permanent-magnet machine was coupled to a commercial turbocharger via an in-line, bolt-on housing attached to the compressor inlet. A high-efficiency, high-temperature variable-frequency drive, consisting of custom control and power electronics, was also developed. The variable-frequency drive uses SiC MOSFETS to achieve high-switching frequency and can be cooled using an existing engine coolant loop operating at up to 105 °C at an efficiency greater than 98%. A digital sliding mode-observer (DSMO) sensorless speed control algorithm was created to command and regulate speed and achieved ramp rates of over 68,000 rpm/sec. This paper intends to present a design overview of the in-line, hybrid-electric device, VFD, and performance characterization of the electronics and sensorless control algorithm.

Copyright (c) 2018 by ASME
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