Active surge supression through dynamically controlled actuated turboshaft speed
AssigneeGarrett Transportation I Inc.
InventorsJens Keuler, Matthieu Gancedo, Quentin Roberts
Life of this patent
Estimating the term…
Abstract
Methods and systems for controlling a turbocharger associated with an engine. The turbocharger is operated in a region of operation creating potential surge conditions, but surge is avoided by varying the speed of the turbocharger in accordance with speed parameters determined by observing a resonant frequency of surge in the system.
Claims19
A method of operating a compressor in an engine system comprising:
- receiving a command to operate the compressor at a speed setpoint in an operating region of the compressor near a surge region of the compressor;
- and
- varying a speed of the compressor above and below the speed setpoint to provide an average speed at the speed setpoint to mitigate surge;
- wherein the compressor is driven by a shaft which is coupled in turn to an electric motor for providing torque to the shaft, and varying the speed of the compressor is performed by varying a control signal provided to the electric motor causing the torque to vary.
A method of configuring and operating a turbocharger to operate in association with an engine, the method comprising:
- operating the turbocharger to generate a surge condition;
- measuring a resonance associated with the surge condition and storing data related to a frequency of the resonance;
- setting a speed variable for use in operation of the turbocharger in the region of the surge condition using the stored data related to the frequency of the resonance;
- and
- operating the turbocharger in the region of the surge condition by varying speed of the turbocharger using the speed variable.
A method of mitigating noise, vibration and harshness (NVH) of an engine system having an engine with an intake manifold and a compressor for compressing air entering the intake manifold, the method comprising:
- sensing presence of NVH above a threshold for NVH;
- varying a speed of the compressor about a speed setpoint using at least one compressor speed test variation;
- and
- identifying a compressor speed test variation that causes a reduction in the sensed NVH.
Dependencies are inferred from the claim text.