Apparatus and method for measuring a tire pressure from the tire footprint
First Claim
1. An apparatus for measuring the tire pressure of a tire provided on a moving vehicle, comprising:
- measuring means which are provided on an underlying surface so as to interact with a tire for generating, in reaction to the tire traveling over said measuring means, a measurement signal which is evaluated electronically;
evaluation means for receiving the measurement signal and outputting a tire pressure signal which corresponds to the tire pressure; and
the measuring means has optical recording means for detecting a tire width as a footprint width of a footprint of the tire which is formed as it travels over the underlying surface, and the evaluation means is designed to determine a footprint length of the footprint from a sequence of tire width data items generated by the optical recording means and/or from a profile of a pressure measurement signal generated by the measuring means, to determine the tire pressure from a footprint area acquired by the (1) footprint length, (2) footprint width and (3) a force acting on the footprint area through the tire.
1 Assignment
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Accused Products
Abstract
An apparatus for measuring the pressure of a tire on a moving vehicle, comprising measuring device (14, 18, 24) which is provided on or inside a floor or ground so as to interact with the tire and which generates an electronically analyzable measurement signal in reaction to the tire driving over the measuring device, and analysis unit (22, 40) which output a tire pressure signal corresponding to the tire pressure in reaction to the measurement signal. The measuring device includes an optical unit (18) for acquiring a tire width as the width of a tire footprint forming when the tire drives over the floor/ground. The analysis unit is designed to determine a footprint length from a series of tire width data generated by the optical unit and/or from a pattern of a pressure measurement signal generated by the measuring device and to determine the tire pressure from a footprint area calculated as a function of the length and width of the footprint and from a force applied to the footprint area by the tire.
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Citations
13 Claims
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1. An apparatus for measuring the tire pressure of a tire provided on a moving vehicle, comprising:
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measuring means which are provided on an underlying surface so as to interact with a tire for generating, in reaction to the tire traveling over said measuring means, a measurement signal which is evaluated electronically; evaluation means for receiving the measurement signal and outputting a tire pressure signal which corresponds to the tire pressure; and the measuring means has optical recording means for detecting a tire width as a footprint width of a footprint of the tire which is formed as it travels over the underlying surface, and the evaluation means is designed to determine a footprint length of the footprint from a sequence of tire width data items generated by the optical recording means and/or from a profile of a pressure measurement signal generated by the measuring means, to determine the tire pressure from a footprint area acquired by the (1) footprint length, (2) footprint width and (3) a force acting on the footprint area through the tire. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for measuring the tire pressure of a tire provided on a moving vehicle, comprising the steps of:
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acquiring a footprint length of a tire footprint which is formed on an underlying surface, by measuring at least one of pressure and optical images of the tire; acquiring a footprint width of the tire footprint by recording optical images by means of an image recording means directed at a profile of the tire; and determining the tire pressure from a footprint area, acquired from the (1) footprint length, (2) footprint width, and (3) a tire force and/or pressure force acting thereon.
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Specification