External mount tire pressure sensor system
First Claim
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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Accused Products
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.
7 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, 6, 7, 8, 9, 10)
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Specification