Transmission method for variable measured values from vehicle wheels utilizing ambient temperature compensation
First Claim
1. In combination, a system for sending an information signal indicative of variable measured values from wheels of a vehicle, wherein energy is transmitted from a primary coil to a secondary coil mounted concentrically on at least one of said wheels during excitation of said primary coil mounted external of said wheels and fixedly connected with the vehicle, and said information signal, which is a function of the output signal of a sensor means located in said at least one of said wheels, is fed back from said secondary coil to the primary coil,the improvement comprising compensation means responsive to said primary coil for temperature-compensating said information signal, said compensation means includingambient temperature sensor means located external of said wheels for producing a set value indicative of ambient temperature about said vehicle;
- andan evaluation circuit for comparing the information signal with said set value whereby to correct representations of information signal due to changes in temperature.
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Abstract
In a transmission method for variable parameters from loaded vehicle wheels, wherein energy is transmitted to a secondary coil (5) mounted concentrically on a wheel during varying excitation by a primary coil (2) integral with a vehicle, and an information signal, which is a function of the output signal of a sensor, is fed back from this secondary coil to a receiving coil integral with the vehicle, the primary coil (2) itself serves as the receiving coil. The information signal can be temperature-compensated, and compared in an evaluation circuit with a set value which is modified in accordance with various pressure-related parameters.
81 Citations
10 Claims
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1. In combination, a system for sending an information signal indicative of variable measured values from wheels of a vehicle, wherein energy is transmitted from a primary coil to a secondary coil mounted concentrically on at least one of said wheels during excitation of said primary coil mounted external of said wheels and fixedly connected with the vehicle, and said information signal, which is a function of the output signal of a sensor means located in said at least one of said wheels, is fed back from said secondary coil to the primary coil,
the improvement comprising compensation means responsive to said primary coil for temperature-compensating said information signal, said compensation means including ambient temperature sensor means located external of said wheels for producing a set value indicative of ambient temperature about said vehicle; - and
an evaluation circuit for comparing the information signal with said set value whereby to correct representations of information signal due to changes in temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification