Arrangement for the wireless transmission of measuring signals
First Claim
1. An arrangement including a sensor and an evaluating unit for the wireless transmission of at least one measuring signal from said sensor and to said evaluating unit by a pair of first electrical coils that are at least temporarily inductively coupled with one another, said sensor being supplied with energy by said evaluating unit via a second pair of electrical coils including primary and secondary coils and connected to said evaluating unit that are temporarily inductively coupled with one another, wherein said sensor includes a power supply circuit means connected to said second pair of electrical coils for receiving a low-frequency energy signal from said second pair of electrical coils for supplying an energy signal to a transmitting oscillator mean, and transmitting oscillator means responding to at least one measured physical quantity and providing a medium frequency measurement signal to be transmitted over said first pair of electrical coils to said evaluating unit, wherein:
- the frequency of said energy supply signal transmitted between said second pair of electrical coils is below 10 kc/s;
said power supply means has at least one secondary oscillating circuit with means for adjusting said secondary oscillating circuit to the frequency of an energy supply signal supplied by said second pair of electrical coils;
said secondary oscillating circuit includes a capacitor connected in parallel to said secondary coil which is connected in parallel to a rectifier bridge that has a filter capacitor as its diagonal bridge;
wherein said sensor is arranged on a machine part which rotates relative to a coupling part which is arranged on a stationary part of the machine; and
wherein said high-frequency receiver is comprised of a variable capacitor connected in parallel with said receiver coil and with said receiver coil forms a receiver oscillating circuit;
a high-frequency filter connected to said variable capacitor;
a high-frequency amplifier connected to said high-frequency filter, and a rectifier connected to said high frequency amplifier, said rectifier having a filter capacitor, and a comparator means connected to said filter capacitor for comparing the voltage at said filter capacitor with a reference voltage.
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Accused Products
Abstract
An arrangement provides for the wireless transmission of a measuring signal from a sensor to an evaluating unit by a pair of first electrical coils that are temporarily inductively coupled with one another. The sensor is supplied with energy by a second pair of electrical coils that are also temporarily inductively coupled with one another. The sensor includes a power supply circuit means for receiving a low-frequency energy signal from the second pair of electrical coils and supplies an energy signal to a transmitting oscillator means. The transmitting oscillator means responds to at least one measured physical quantity and provides a medium-frequency measurement signal to be transmitted over the first pair of electrical coils. When used in a tire pressure control system, this arrangement provides for a reliable transmission of signals over a relatively large transmission path without strict mounting tolerances, while complying with governmental regulations.
112 Citations
27 Claims
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1. An arrangement including a sensor and an evaluating unit for the wireless transmission of at least one measuring signal from said sensor and to said evaluating unit by a pair of first electrical coils that are at least temporarily inductively coupled with one another, said sensor being supplied with energy by said evaluating unit via a second pair of electrical coils including primary and secondary coils and connected to said evaluating unit that are temporarily inductively coupled with one another, wherein said sensor includes a power supply circuit means connected to said second pair of electrical coils for receiving a low-frequency energy signal from said second pair of electrical coils for supplying an energy signal to a transmitting oscillator mean, and transmitting oscillator means responding to at least one measured physical quantity and providing a medium frequency measurement signal to be transmitted over said first pair of electrical coils to said evaluating unit, wherein:
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the frequency of said energy supply signal transmitted between said second pair of electrical coils is below 10 kc/s; said power supply means has at least one secondary oscillating circuit with means for adjusting said secondary oscillating circuit to the frequency of an energy supply signal supplied by said second pair of electrical coils; said secondary oscillating circuit includes a capacitor connected in parallel to said secondary coil which is connected in parallel to a rectifier bridge that has a filter capacitor as its diagonal bridge; wherein said sensor is arranged on a machine part which rotates relative to a coupling part which is arranged on a stationary part of the machine; and wherein said high-frequency receiver is comprised of a variable capacitor connected in parallel with said receiver coil and with said receiver coil forms a receiver oscillating circuit;
a high-frequency filter connected to said variable capacitor;
a high-frequency amplifier connected to said high-frequency filter, and a rectifier connected to said high frequency amplifier, said rectifier having a filter capacitor, and a comparator means connected to said filter capacitor for comparing the voltage at said filter capacitor with a reference voltage. - View Dependent Claims (6, 7, 8, 12, 15, 16, 17, 18, 24, 25, 26, 27)
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2. An arrangement including a sensor and an evaluating unit for the wireless transmission of at least one measuring signal from said sensor and to said evaluating unit by a pair of first electrical coils that are at least temporarily inductively coupled with one another, said sensor being supplied with energy by said evaluating unit via a second pair of electrical coils connected to said evaluating unit that are temporarily inductively coupled with one another;
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wherein said sensor includes a power supply circuit means connected to said signal pair of electrical coils for receiving a high power, low-frequency energy signal from said second pair of electrical coils for supplying an energy signal to a transmitting oscillator means, said transmitting oscillator means responding to at least one measured physical quantity and providing a low power, medium frequency measurement signal to be transmitted over said first pair of electrical coils to said evaluating unit; wherein said sensor and evaluation unit each include a double shell core having a cylindrical core and two concentric pot-shaped shells that form concentric exterior and interior winding spaces, one of said winding spaces receiving one of said coils from said first pair of electrical coils and the other of said winding spaces receiving one of said coils from said second pair of electrical coils. - View Dependent Claims (3, 4, 9, 10, 11, 13, 14, 19, 20, 21, 22, 23)
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5. An arrangement including a sensor and an evaluating unit for the wireless transmission of at least one measuring signal from said sensor and to said evalutaing unit by a pair of first electrical coils that are at least temporarily inductively coupled with one another, said sensor being supplied with energy said evaluating unit via a second pair of electrical coils connected to said evaluating unit that are temporarily inductively coupled with one another;
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wherein said sensor includes a power supply circuit means connected to said second pair of electrical coils for receiving a high power, low-frequency energy signal from said second pair of electrical coils for supplying an energy signal to a transmitting oscillator means, said transmitting oscillator means responding to at least one measured physical quantity and providing a low power, medium frequency measurement signal to be transmitted over said first pair of electrical coils to said evaluating unit; a pulse generator means for sending an electrical signal pulse to said evaluating unit for each revolution of said sensor relative to said evaluating unit; detector means for sending a detection signal to said evaluating unit upon detecting a measurement signal on said first pair of electrical coils; said evaluating unit generating an output signal when a preset number of pulses have been received from said ppulse generator means after a detection signal from said detector means.
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Specification