ROTATION SPEED DETECTION DEVICE
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United States of America Patent
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Issued Date -
Nov 29, 2018
app pub date -
Sep 21, 2016
filing date -
Sep 21, 2016
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Abstract
A rotation speed detection device includes a blade detection sensor located in a housing of a turbocharger and that outputs an output voltage that fluctuates according to an approaching of a blade of a compressor wheel to the blade detection sensor and a separation of the blade from the blade detection sensor, and a sensor circuit to binarize an output signal of the blade detection sensor into a high signal and a low signal and to output the signals. The sensor circuit includes a low pass filter to cut off a high frequency component of the output signal by an analog filter or a digital filter, a high pass filter to cut off a low frequency component of the output signal by a digital filter, and a control unit to increase a cut-off frequency of the high pass filter in accordance with an increase in rotation speed of the turbocharger.
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