Tire pressure sensing systems
First Claim
1. A tire pressure sensing system comprising:
- a pressure sensor mounted for rotation with a tire;
an optical radiation guide mounted for rotation with the tire, said sensor supplying optical output signals to said radiation guide, said radiation guide directing the optical output signals to a location substantially coaxial of said tire;
optical receiver means; and
means mounting said receiver means on a stationary member coaxial of said tire and aligned to receive said optical output signals from the radiation guide, said receiver means supplying signals indicative of tire pressure to a location remote from said receiver means.
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Accused Products
Abstract
A tire pressure sensing system has a sensor mounted on the tire hub, the sensor having a mask that is moved on change in tire pressure. Two rows of fibres at the end of a fibre-optic cable are positioned on opposite sides of a slit in the mask. The fibres of the two rows extend along a central core and an outer ring respectively of the cable. The rear end of the cable is mounted coaxially of the tire in alignment with a stationary cable having an inner core and an outer ring which extend to a radiation source and to a detector respectively. The source supplies radiation, via the cable, to the outer ring of the cable and hence to the row of fibres. Change in pressure moves the mask, thereby changing the amount of radiation received by the other row of fibres which passes to the outer ring of the stationary cable and thereby to the detector. The detector monitors the radiation and provides an output indicative of tire pressure.
13 Citations
10 Claims
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1. A tire pressure sensing system comprising:
- a pressure sensor mounted for rotation with a tire;
an optical radiation guide mounted for rotation with the tire, said sensor supplying optical output signals to said radiation guide, said radiation guide directing the optical output signals to a location substantially coaxial of said tire;
optical receiver means; and
means mounting said receiver means on a stationary member coaxial of said tire and aligned to receive said optical output signals from the radiation guide, said receiver means supplying signals indicative of tire pressure to a location remote from said receiver means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- a pressure sensor mounted for rotation with a tire;
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10. A tire pressure sensing system comprising:
- a pressure sensor mounted for rotation with a tire, said sensor including a mask that is displaced in accordance with change in pressure;
a fibre-optic cable mounted for rotation with the tire, said cable including an inner bundle of fibres and an outer bundle of fibres surrounding said inner bundle of fibres, one end of one of said bundles being arranged in a row on one side of said mask, and one end of the other of said bundles being arranged in a row on the other side of said mask, the other end of said cable extending to a location substantially coaxial of said tire;
optical receiver means including radiation emitting means and radiation detecting means; and
means mounting said receiver means on a stationary member coaxial of said tire in alignment with said cable, said radiation emitting means supplying radiation to one of said bundles of fibres, and said radiation detecting means receiving radiation from the other of said bundle of fibres that is modified in accordance with pressure by displacement of said mask.
- a pressure sensor mounted for rotation with a tire, said sensor including a mask that is displaced in accordance with change in pressure;
Specification