Rotational turbocharger speed detector
First Claim
1. A rotational speed detector for a turbocharger arranged of two turbochargers on an internal-combustion engine, comprising:
- at least one piezoelectric acceleration sensor fixed on each of the turbochargers and constructed as a knock sensor, the sensor providing output signals;
an analyzing unit receiving the output signals and including an analog filter arrangement which filters the output signals from the acceleration sensor to provide filtered output signals; and
wherein the filtered output signals are provided as input signals to an electronic control unit of the internal-combustion engine or a measuring unit either by way of a frequency-to-voltage converter in the form of an analog voltage or directly in the form of frequency signals wherein said analyzing unit or said control unit comprises means for forming a differential rotational signal.
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Accused Products
Abstract
An arrangement for detecting the turbocharger rotational speed on internal-combustion engines is provided with at least one piezoelectric acceleration sensor fixed on the turbocharger and with an analyzing circuit having an analog filter arrangement for filtering the output signals of the acceleration sensor. The output signals of the filter arrangement are fed by way of a frequency-to-voltage converter in the form of an analog voltage, or directly in the form of frequency signals, as input signals to an electronic control unit of the internal-combustion engine or to a measuring and/or display unit. As a result, the turbocharger rotational speed can be detected at a reasonable cost with a small and robust arrangement suitable for mass production and requiring no constructional changes on the turbocharger.
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Citations
14 Claims
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1. A rotational speed detector for a turbocharger arranged of two turbochargers on an internal-combustion engine, comprising:
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at least one piezoelectric acceleration sensor fixed on each of the turbochargers and constructed as a knock sensor, the sensor providing output signals;
an analyzing unit receiving the output signals and including an analog filter arrangement which filters the output signals from the acceleration sensor to provide filtered output signals; and
wherein the filtered output signals are provided as input signals to an electronic control unit of the internal-combustion engine or a measuring unit either by way of a frequency-to-voltage converter in the form of an analog voltage or directly in the form of frequency signals wherein said analyzing unit or said control unit comprises means for forming a differential rotational signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification