External mount tire pressure sensor system
First Claim
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1. An external mount tire pressure sensor system comprising:
- a variable resistance displacement sensor element for providing resistance values indicative of internal tire pressure when coupled to an external wall surface of a pneumatic tire;
a processor coupled to said displacement sensor element for converting resistance values corresponding to inadequate internal tire pressure to r.f. generator activation signals; and
an r.f. generator circuit for transmitting a low tire pressure warning signal when activated by said processor.
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Abstract
An external mount tire pressure sensor system with a stretch sensor having a variable resistance longitudinal displacement characteristic. The stretch sensor is coupled to a processor which samples the resistance of the stretch sensor periodically. The sensor body is attached to the external side wall of a pneumatic tire so that the body is displaced by the tire side wall and the resistance is a function of internal tire pressure. When the processor determines that the pressure is below a threshold value, an r.f. generator is activated by the processor to generate a low tire pressure signal. This signal is converted by a receiver to a warning for the driver.
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Citations
10 Claims
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1. An external mount tire pressure sensor system comprising:
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a variable resistance displacement sensor element for providing resistance values indicative of internal tire pressure when coupled to an external wall surface of a pneumatic tire;
a processor coupled to said displacement sensor element for converting resistance values corresponding to inadequate internal tire pressure to r.f. generator activation signals; and
an r.f. generator circuit for transmitting a low tire pressure warning signal when activated by said processor. - View Dependent Claims (2, 3, 4, 5)
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6. An external mount tire pressure sensor system comprising:
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a variable resistance displacement sensor element for providing resistance values indicative of internal tire pressure when coupled to an external wall surface of a pneumatic tire;
a processor coupled to said displacement sensor element for converting resistance values corresponding to inadequate internal tire pressure to r.f. generator activation signals, said processor including value determining circuitry for determining the maximum and minimum resistance values provided by said variable resistance displacement sensor during one revolution of a pneumatic tire and for calculating the difference between said maximum and said minimum resistance values; and
an r.f. generator circuit for transmitting a low tire pressure warning signal when activated by said processor. - View Dependent Claims (7, 8, 9, 10)
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Specification