Method and apparatus for operating an electric-motor-assisted exhaust turbocharger of a motor vehicle
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United States of America Patent
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Issued Date -
Jun 2, 2016
app pub date -
Nov 24, 2015
filing date -
Nov 28, 2014
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Abstract
An electric-motor-assisted exhaust turbocharger of a motor vehicle includes an exhaust turbocharger having a first electric machine. A low-voltage on-board electrical system with a second electric machine can be operated as a motor and as a generator and can be coupled for torque transmission to the crankshaft, and an electric energy storage device supplies the electric loads arranged in the low-voltage on-board electrical system. A control unit controls the first electric machine in a first operating mode to drive the exhaust turbocharger, and controls the first electric machine in a second operating mode to recover electric energy from the exhaust-gas energy. The control unit feeds electric energy from the low-voltage on-board electrical system to the exhaust turbocharger in the first operating mode and feeds the recovered electric energy into the low-voltage on-board electrical system in the second operating mode.
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