INDIRECT TIRE PRESSURE MONITORING SYSTEMS AND METHODS
First Claim
1. A sensor comprising:
- sensing circuitry to sense a wheel speed;
an analog to digital converter coupled to the sensing circuitry to convert an analog signal into a digital signal;
frequency analysis circuitry to receive the digital signal from the analog to digital converter and to derive frequency information for indirect tire pressure monitoring;
transmission circuitry to transmit the frequency information for indirect tire pressure monitoring from the sensor to an electronic control unit.
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Accused Products
Abstract
Embodiments relate to indirect tire pressure monitoring systems (TPMSs) and methods that utilize anti-lock braking system (ABS) signals. In embodiments, information from the ABS Hall signal is obtained in analog form, before pulse forming. The information can be analyzed for a resonance frequency within the ABS sensor. In some embodiments, the digitized information can be modulated onto the conventional ABS wheel speed clock signal for transmission to and analysis by the indirect TPMS electronic control unit (ECU). According to embodiments, additional information about higher-order harmonics of the wheel rotation can be provided to the TPMS ECU, which can then calculate a more accurate estimation of tire pressure while reducing warning latency.
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Citations
13 Claims
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1. A sensor comprising:
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sensing circuitry to sense a wheel speed; an analog to digital converter coupled to the sensing circuitry to convert an analog signal into a digital signal; frequency analysis circuitry to receive the digital signal from the analog to digital converter and to derive frequency information for indirect tire pressure monitoring; transmission circuitry to transmit the frequency information for indirect tire pressure monitoring from the sensor to an electronic control unit. - View Dependent Claims (2, 3, 4, 5)
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6. A sensor comprising:
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sensing circuitry to sense a wheel speed; an analog to digital converter coupled to the sensing circuitry to convert an analog signal into a digital signal; harmonics analysis circuitry to receive the digital signal from the analog to digital converter and to derive harmonics information for indirect TPMS; transmission circuitry to transmit the harmonics information for indirect TPMS from the sensor to an electronic control unit. - View Dependent Claims (7, 8, 9)
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10. A system comprising:
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a sensor to provide a wheel speed signal; an electronic control unit to receive the wheel speed signal from the sensor; an indirect tire pressure monitoring system (TPMS) to derive tire pressure information, wherein the sensor comprises at least a part of a digital TPMS analysis circuitry of the indirect TPMS. - View Dependent Claims (11, 12, 13)
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Specification