Tire sensor
First Claim
1. Tire sensor system, comprising:
- at least two pick-ups for measuring data from a rotating tire, a motor vehicle control system, wherein said measured data includes at least one analog signal and at least one digital signal, a conditioning and processing unit coupled between the motor vehicle control system and the pick-ups for conditioning and processing the measured data, wherein at least one of the signals contains tire related data in its phase and at least one of the signals contains tire related data in its amplitude, and wherein the conditioning and processing unit couples output information to said motor vehicle control system and calibrates the systematic errors of the output information with respect to whether an error in the measured data is an amplitude-related error or a phase-related error, wherein the amplitude-related error is compensated by a multiplicative calibration and the phase-related error is compensated by an additive calibration in the conditioning and processing unit.
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Accused Products
Abstract
The present invention relates to a tire sensor, especially tire sidewall torsion sensor (=SWT sensor), including at least two pick-ups for measuring data being mounted at a distance from the tire rotational axis on the chassis, the said pick-ups for measuring data interacting with at least one encoder mounted on or in the tire wall or with at least one conventional encoder mounted on or in the tire wall and exhibiting poles, wherein the output signals or output information of such pick-ups for measuring data sensors are/is transmitted to the motor vehicle control system.
In order to send the signals provided by the tire sensor to an evaluation unit or the motor vehicle control system in a fashion rid of errors that are due to influence quantities, at least one analog and at least one digital signal conditioning and/or processing unit is provided between the motor vehicle control system and the pick-ups for measuring data, the pick-ups for measuring data send at least two output signals that can be evaluated with respect to a change in the phase position and/or at least one output signal that can be evaluated with respect to the change of the amplitude to the digital signal-conditioning and/processing unit, and the digital signal-conditioning and/or processing unit calibrates the systematic errors of the output signals with respect to whether the error is an amplitude-related error or a phase-related error.
6 Citations
13 Claims
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1. Tire sensor system, comprising:
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at least two pick-ups for measuring data from a rotating tire, a motor vehicle control system, wherein said measured data includes at least one analog signal and at least one digital signal, a conditioning and processing unit coupled between the motor vehicle control system and the pick-ups for conditioning and processing the measured data, wherein at least one of the signals contains tire related data in its phase and at least one of the signals contains tire related data in its amplitude, and wherein the conditioning and processing unit couples output information to said motor vehicle control system and calibrates the systematic errors of the output information with respect to whether an error in the measured data is an amplitude-related error or a phase-related error, wherein the amplitude-related error is compensated by a multiplicative calibration and the phase-related error is compensated by an additive calibration in the conditioning and processing unit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Tire sensor system, comprising:
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at least two pick-ups for measuring data from a rotating tire, a motor vehicle control system, wherein said measured data includes at least one analog signal and at least one digital signal, a conditioning and processing unit coupled between the motor vehicle control system and the pick-ups for conditioning and processing the measured data, wherein at least one of the signals contains tire related data in its phase and at least one of the signals contains tire related data in its amplitude, and wherein the conditioning and processing unit couples output information to said motor vehicle control system and calibrates the systematic errors of the output information with respect to whether an error in the measured data is an amplitude-related error or a phase-related error, wherein the conditioning and processing unit includes an analog signal-conditioning unit and wherein said analog signal is generally sinusoidal.
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9. Tire sensor system, comprising:
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at least two pick-ups for measuring data from a rotating tire, a motor vehicle control system, wherein said measured data includes at least one analog signal and at least one digital signal, a conditioning and processing unit coupled between the motor vehicle control system and the pick-ups for conditioning and processing the measured data, wherein at least one of the signals contains tire related data in its phase and at least one of the signals contains tire related data in its amplitude, and wherein the conditioning and processing unit couples output information to said motor vehicle control system and calibrates the systematic errors of the output information with respect to whether an error in the measured data is an amplitude-related error or a phase-related error, wherein the conditioning and processing unit includes an analog signal-conditioning unit, and wherein the amplitude-related output signal is rectified in the analog signal-conditioning unit and a maximum value is determined, and wherein in the conditioning or processing unit includes a digital signal conditioning unit, which calculates an offset by way of averaging the maximum values with correct signs, and wherein a multiplier f is formed of the maximum value divided by the mean value of the rectified signal. - View Dependent Claims (10, 11)
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12. Tire sensor as claimed in clam 10, wherein the correction factors are stored in a memory of the digital signal-conditioning or processing unit.
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13. Tire sensor system, comprising:
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at least two pick-ups for measuring data from a rotating tire, a motor vehicle control system, wherein said measured data includes at least one analog signal and at least one digital signal, a conditioning and processing unit coupled between the motor vehicle control system and the pick-ups for conditioning and processing the measured data, wherein at least one of the signals contains tire related data in its phase and at least one of the signals contains tire related data in its amplitude, and wherein the conditioning and processing unit couples output information to said motor vehicle control system and calibrates the systematic errors of the output information with respect to whether an error in the measured data is amplitude-related error or a phase-related error, wherein the calibration of the amplitude-related errors or phase-related errors is effected during stationary driving behavior.
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Specification