method for monitoring a rotation of a compressor wheel
AssigneeRobert Bosch GmbH
InventorKlaus Lerchenmueller
Life of this patent
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Abstract
In a method for monitoring a rotation of a compressor wheel of an exhaust-gas turbocharger, which compressor wheel has on the peripheral side a number n of blades, an inductive sensor is provided for detecting the speed or rotational frequency, which sensor produces at least one output signal as a function of eddy currents generated as the blades pass by, and the rotational speed of the compressor wheel is inferred from a fundamental frequency of the output signal. In addition, information about a fault of the compressor wheel is derived from at least one modulation of the output signal, e.g., amplitude modulation, and an imbalance of the compressor wheel is detected.
Claims11
1-10. (canceled)
A method for monitoring a rotation of a compressor wheel of an exhaust-gas turbocharger, the compressor wheel having on the peripheral side a number n of blades, the method comprising:
- generating, by an inductive sensor, at least one output signal as a function of eddy currents generated as the blades pass by the sensor;
- and
- detecting, using an evaluation unit, at least one rotational property of the compressor wheel including rotational speed, wherein the rotational speed of the compressor wheel is inferred from a fundamental frequency of the output signal, and wherein information about a fault of the compressor wheel is derived from at least one modulation of the output signal.
A device for monitoring a rotation of compressor wheel of an exhaust-gas turbocharger, the compressor wheel having on the peripheral side a number n of blades, the device comprising:
- at least one inductive sensor for generating at least one output signal as a function of eddy currents generated as the blades pass by the sensor;
- and
- at least one evaluation unit for evaluating the output signal to detect at least one rotational property of the compressor wheel including rotational speed, wherein the rotational speed of the compressor wheel is inferred from a fundamental frequency of the output signal, and wherein information about a fault of the compressor wheel is derived from at least one modulation of the output signal.
Dependencies are inferred from the claim text.