Controlling an electronically-assisted turbocharger
AssigneeCalnetix Technologies, LLC
InventorsLiping Zheng, Suratkal P. Shenoy, Co Si Huynh
Life of this patent
Estimating the term…
Abstract
A first line-to-line terminal voltage of a three-phase electric motor is measured while the three-phase electric motor free-spins. A second line-to-line terminal voltage of a three-phase electric motor is measured while the three-phase electric motor free-spins. A motor's rotor position is determined based on the first line-to-line terminal voltage and the second line-to-line terminal voltage. Three-phase current is sent to the motor after the rotor position has been determined. The three-phase current being in-phase with the rotor position.
Claims13
An electric motor control system comprising;
- a three-phase electric machine configured to drive or be driven by a rotating device;
- a variable speed drive electrically coupled to the electrical machine, the variable speed drive configured to drive the electric machine with three phases of current;
- a first voltage sensor configured to measure a first line-to-line terminal voltage of the three-phase electric machine while the three-phase electric machine free-spins;
- a second voltage sensor configured to measure a second line-to-line terminal voltage of the three-phase electric machine while the three-phase electric machine free-spins;
- and
- a controller configured to:
- receive the first line-to-line terminal voltage and the second line-to-line terminal voltage,
- determine rotor position of the three-phase electric machine, and
- send three-phase power to the three-phase electric machine after the three-phase electric machine's rotor position has been determined, the three phase power being in-phase with the three-phase electric machine's rotor position.
An electrically boosted turbocharger system comprising:
- a turbocharger configured to increase an intake manifold pressure of an internal combustion engine, the turbocharger comprising:
- a compressor configure to increase the intake manifold pressure;
- and
- a turbine rotatably coupled to the compressor, the turbine configured to convert exhaust flow into rotational motion, the turbine configured to rotate the compressor;
- a three-phase electric motor rotatably coupled to the turbocharger, the motor configured to accelerate the turbocharger to a pre-set speed;
- a variable speed drive electrically coupled to the motor, the variable speed drive configured to drive the electric motor with three phases of current, the variable speed drive configured to exchange current with the electric motor when the electric motor is accelerating;
- a first voltage sensor configured to measure a first line-to-line terminal voltage of the three-phase electric motor while the three-phase electric motor free-spins;
- and
- a second voltage sensor configured to measure a second line-to-line terminal voltage of the three-phase electric motor while the three-phase electric motor free-spins.
Dependencies are inferred from the claim text.