Indirect tire pressure monitoring systems and methods using multidimensional resonance frequency analysis
First Claim
1. An indirect tire pressure monitoring system (TPMS) comprising:
- an antilock braking system (ABS) configured to provide a wheel speed signal; and
an electronic control unit (ECU) coupled to the ABS and configured to process the wheel speed signal using a multidimensional resonance frequency analysis (MRFA) that includes a spectral analysis identifying a plurality of resonance frequencies associated with at least two tire vibration modes in the wheel speed signal and isolates at least one characteristic affecting the at least two tire vibration modes,wherein the ECU is configured to verify an estimated tire pressure based on at least one other parameter related to a combination of the at least two tire vibration modes.
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Abstract
An indirect tire pressure monitoring systems (TPMS) and methods that utilize anti-lock braking system (ABS) sensed signals coupled to circuitry and/or controllers to process the sensed signals using a multidimensional resonance frequency analysis (MRFA) technique. Additional information from other sensed signals or stored data settings for non-tire variables and parameters can be incorporated into the MRFA. Thus, an indirect TPMS comprises at least one signal from an ABS, such as a wheel speed signal, and an electronic control unit (ECU) that processes the at least one signal from the ABS using at least one MRFA technique. The MRFA uses a spectral analysis of tire vibrations as determined from the sensed ABS signals over different points in the spectrum that can reflect different vibration modes and different corresponding resonance frequencies.
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Citations
18 Claims
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1. An indirect tire pressure monitoring system (TPMS) comprising:
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an antilock braking system (ABS) configured to provide a wheel speed signal; and an electronic control unit (ECU) coupled to the ABS and configured to process the wheel speed signal using a multidimensional resonance frequency analysis (MRFA) that includes a spectral analysis identifying a plurality of resonance frequencies associated with at least two tire vibration modes in the wheel speed signal and isolates at least one characteristic affecting the at least two tire vibration modes, wherein the ECU is configured to verify an estimated tire pressure based on at least one other parameter related to a combination of the at least two tire vibration modes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13)
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12. An indirect tire pressure monitoring system (TPMS) comprising:
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an antilock braking system (ABS) configured to provide a wheel speed signal; and an electronic control unit (ECU) coupled to the ABS and configured to process the wheel speed signal using a multidimensional resonance frequency analysis (MRFA) that includes a spectral analysis identifying a plurality of resonance frequencies associated with at least two tire vibration modes in the wheel speed signal and isolates at least one characteristic affecting the at least two tire vibration modes, wherein at least one of the at least two different tire vibration modes is identified from the spectral analysis at a level below a conventional signal to noise ratio (SNR) of a wheel speed spectrum extracted from a conventional ABS sensor signal.
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14. A method of indirect tire pressure monitoring of individual tires on a vehicle comprising:
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extracting data from an antilock braking system (ABS) for a tire, the data representative of wheel speed of the tire; and using a signal processing system to analyze the data to determine a plurality of resonance frequencies associated with the data, and to analyze the plurality of resonance frequencies to determine at least an estimated tire pressure for the tire, wherein the signal processing system comprises an electronic control unit (ECU), wherein analyzing the data further comprises identifying at least one of the plurality of resonance frequencies from a spectral analysis at a level below a conventional signal to noise ratio (SNR) of a wheel speed spectrum extracted from a conventional ABS sensor signal. - View Dependent Claims (15, 16, 17, 18)
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Specification