Tire pressure sensor system with improved sensitivity and power saving

a sensor system and tire pressure technology, applied in vehicle tyre testing, instruments, roads, etc., can solve the problems of limited performance of such devices, limited sensitivity of the sensor circuit to the variable resistance range of the single strain gauge used, and relatively insensitive sensors to mechanical vibration. , to achieve the effect of extending the useful battery life, and reducing the risk of damag
US20070113636A1Active Publication Date: 2007-05-24SILICON VALLEY MICRO C
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
SILICON VALLEY MICRO C
Publication Date
2007-05-24

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Abstract

A battery powered tire pressure sensor system with a high sensitivity stretch sensor assembly having a variable resistance longitudinal displacement characteristic. The stretch sensor assembly has at least two juxtaposed stretch sensors, each with a first layer bearing the variable resistance element and a second support layer. The sensor assembly is mounted on or in the side wall of a pneumatic tire so that the assembly is displaced by the tire side wall and the resistance is a function of internal tire pressure. The assembly is coupled to a processor which samples the resistance of the stretch sensor assembly periodically. When the processor determines that the pressure is outside a safe range, an r.f. generator is activated by the processor to generate an unsafe tire pressure signal. This signal is converted by a receiver to a warning for the driver. A power saving unit controls application of electrical power to the system as a function of tire speed to prolong battery life.
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Description

BACKGROUND OF THE INVENTION

[0001] This invention relates to automotive tire pressure sensors. More particularly, this invention relates to a battery powered method and system for monitoring internal tire pressure of vehicle tires using a sensor system with improved sensitivity and a power saving device.

[0002] Tire pressure sensor systems are known and are commonly used to monitor the internal air pressure in individual pneumatic tires of a vehicle and to provide a warning signal to the driver whenever the internal air pressure in one or more of the vehicle tires is dangerously low or high. The warning signal is typically generated by an r.f. signal generator controlled by a microprocessor connected to the tire pressure sensor, the warning signal being generated whenever the internal tire pressure measured by the sensor lies outside a predetermined normal operating range, signifying either a high or a low pressure condition. This r.f. signal is transmitted to a vehicle-mounted rece...

Claims

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