Measuring and testing – Tire – tread or roadway – Tire inflation testing installation
Patent
1988-08-22
1989-09-19
Woodiel, Donald O.
Measuring and testing
Tire, tread or roadway
Tire inflation testing installation
73745, 338 32H, 340448, B60C 2304
Patent
active
048669822
ABSTRACT:
A tire pressure sensing system for on-board use in an automotive vehicle comprises a transmitter mounted to rotate with each tire and a receiver that is disposed in sensing relationship to each transmitter. Each receiver is a Hall Effect sensor. Each transmitter comprises three magnetic poles that are effective to cause the Hall Effect sensor to develop a bi-directional pulse waveform during passage of the transmitter past the receiver. Electronic circuitry processes the signal waveform that is created by the Hall Effect sensor in response to passage of the magnetic poles. The circuitry develops one rectangular pulse waveform from one magnetic polarity and another rectangular pulse waveform from the other magnetic polarity. The pressure measurement is insensitive to rotational speed of the tire over a certain range of rotational speeds and the acutal pressure measurement is derived by developing a duty cycle waveform in which the duty cycle is a function of the time interval between the leading edge of one of the rectangular pulse waveforms and the leading edge of the other of the rectangular pulse waveforms. The duty cycle waveform is then integrated and filteted to develop the actual pressure measurement signal.
REFERENCES:
patent: 4119944 (1978-10-01), Smith
patent: 4597286 (1986-07-01), Aguglia
patent: 4807468 (1989-02-01), Galan
Telemagnetics, Inc.
Woodiel Donald O.
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