Method and apparatus for determining tire condition and location using wheel speed sensors and acceleration sensors
First Claim
1. A tire condition sensing apparatus comprising:
- a toothed disc mounted for rotation with a vehicle tire;
a disc rotation sensor for providing a pulse signal each time a disc tooth passes the disc rotation sensor;
an acceleration sensor mounted for rotation with the tire for producing a sinusoidal signal as the tire rotates through the earth'"'"'s gravitation field;
a tire-based controller for processing the acceleration signal to determine two predetermined locations of the sensor relative to the earth'"'"'s horizon as the tire rotates and determine any time delay in performing said processing;
a sensor for sensing the tire condition;
a transmitter for transmitting a message packet when the tire-based controller determines the acceleration sensor is at the predetermined locations relative to the earth'"'"'s horizon along with any determined time delay;
a vehicle-based controller for monitoring the disc rotation sensor and the transmitted message packets and correlating an angular position of the disc in response to the transmitted message packets.
1 Assignment
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Accused Products
Abstract
A tire condition sensing apparatus includes a tire-based sensor for sensing two relative rotational positions of its associated tire relative to the earth'"'"'s horizon as the tire rotates and provides first and second signals indicative thereof. A transmitter for transmits tire condition information and a signal processing time delay value in response to the first and second signals. A vehicle-based sensor monitors tire rotation relative to the vehicle'"'"'s chassis and provides a signal indicative thereof. A controller for monitors the transmitted tire condition information signal, the signal processing time delay value, and the signal from the vehicle-based sensor and associates tire location in response thereto.
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Citations
2 Claims
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1. A tire condition sensing apparatus comprising:
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a toothed disc mounted for rotation with a vehicle tire; a disc rotation sensor for providing a pulse signal each time a disc tooth passes the disc rotation sensor; an acceleration sensor mounted for rotation with the tire for producing a sinusoidal signal as the tire rotates through the earth'"'"'s gravitation field; a tire-based controller for processing the acceleration signal to determine two predetermined locations of the sensor relative to the earth'"'"'s horizon as the tire rotates and determine any time delay in performing said processing; a sensor for sensing the tire condition; a transmitter for transmitting a message packet when the tire-based controller determines the acceleration sensor is at the predetermined locations relative to the earth'"'"'s horizon along with any determined time delay; a vehicle-based controller for monitoring the disc rotation sensor and the transmitted message packets and correlating an angular position of the disc in response to the transmitted message packets. - View Dependent Claims (2)
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Specification