Apparatus for detecting pressure condition in a pneumatic tire
First Claim
1. An apparatus for detecting pressure condition in a pneumatic tire on a vehicle body, comprising:
- a pressure-responsive resonant switching device adapted to be mounted on the pneumatic tire and switchable among a first impedance state, where the pneumatic tire is under-inflated, a second impedance state, where the pressure in the pneumatic tire is within a predetermined normal operating pressure range, and a third impedance state, where the pneumatic tire is over-inflated;
an excitation unit adapted to be mounted on the vehicle body adjacent to the pneumatic tire; and
a controller connected to said excitation unit and operable so as to supply an excitation signal to said excitation unit in order to enable said excitation unit to co-act with said resonant switching device by virtue of mutual induction according to the impedance state of said resonant switching device for inducing current in said resonant switching device as said resonant switching device is moved so as to be proximate with said excitation unit due to rotation of the pneumatic tire relative to the vehicle body, said controller monitoring an output signal from said excitation unit and detecting presence of a change in the output signal of said excitation unit due to inducing of the current in said resonant switching device during a complete cycle of rotation of the pneumatic tire to enable said controller to determine the pressure condition in the pneumatic tire.
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Abstract
In an apparatus for detecting the pressure condition in a pneumatic tire on a vehicle body, a pressure-responsive resonant switching device is mounted on the pneumatic tire and is switchable between a first impedance state, where pressure in the pneumatic tire is within a predetermined normal operating pressure range, and a second impedance state, where the pressure in the pneumatic tire is not within the predetermined normal operating pressure range. An excitation unit is mounted on the vehicle body adjacent to the pneumatic tire. A controller supplies an excitation signal to the excitation unit in order to enable the latter to co-act with the resonant switching device by virtue of mutual induction according to the impedance state of the resonant switching device for inducing current in the resonant switching device as the resonant switching device is moved so as to be proximate with the excitation unit due to rotation of the pneumatic tire relative to the vehicle body. The controller monitors an output signal from the excitation unit and detects the presence of a change in the output signal of the excitation unit due to inducing of the current in the resonant switching device during a complete cycle of rotation of the pneumatic tire to enable the controller to determine the pressure condition in the pneumatic tire.
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Citations
31 Claims
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1. An apparatus for detecting pressure condition in a pneumatic tire on a vehicle body, comprising:
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a pressure-responsive resonant switching device adapted to be mounted on the pneumatic tire and switchable among a first impedance state, where the pneumatic tire is under-inflated, a second impedance state, where the pressure in the pneumatic tire is within a predetermined normal operating pressure range, and a third impedance state, where the pneumatic tire is over-inflated; an excitation unit adapted to be mounted on the vehicle body adjacent to the pneumatic tire; and a controller connected to said excitation unit and operable so as to supply an excitation signal to said excitation unit in order to enable said excitation unit to co-act with said resonant switching device by virtue of mutual induction according to the impedance state of said resonant switching device for inducing current in said resonant switching device as said resonant switching device is moved so as to be proximate with said excitation unit due to rotation of the pneumatic tire relative to the vehicle body, said controller monitoring an output signal from said excitation unit and detecting presence of a change in the output signal of said excitation unit due to inducing of the current in said resonant switching device during a complete cycle of rotation of the pneumatic tire to enable said controller to determine the pressure condition in the pneumatic tire. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for detecting pressure condition in a set of pneumatic tires on a vehicle body, comprising:
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a set of pressure-responsive resonant switching devices adapted to be mounted respectively on the pneumatic tires, each of which is switchable among a first impedance state, where the respective one of the pneumatic tires is under-inflated, a second impedance state, where the pressure in the respective one of the pneumatic tires is within a predetermined normal operating pressure range, and a third impedance state, where the respective one of the pneumatic tires is over-inflated; a set of excitation units adapted to be mounted on the vehicle body adjacent to the pneumatic tires, respectively; and a controller connected to said excitation units and operable so as to supply an excitation signal to each of said excitation units in order to enable each of said excitation units to co-act with a respective one of said resonant switching devices by virtue of mutual induction according to the impedance state of the respective one of said resonant switching devices for inducing current in the respective one of said resonant switching devices as the respective one of said resonant switching devices is moved so as to be proximate with the respective one of said excitation units due to rotation of the pneumatic tires relative to the vehicle body, said controller monitoring an output signal from each of said excitation units and detecting presence of a change in the output signals of said excitation units due to inducing of the current in the respective one of said resonant switching devices during a complete cycle of rotation of the pneumatic tires to enable said controller to determine the pressure condition in each of the pneumatic tires. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An apparatus for detecting pressure condition in a pneumatic tire on a vehicle body, comprising:
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a pressure-responsive resonant switching device adapted to be mounted on the pneumatic tire and switchable between a first impedance state, where pressure in the pneumatic tire is within a predetermined normal operating pressure range, and a second impedance state, where the pressure in the pneumatic tire is not within the predetermined normal operating pressure range; an excitation unit adapted to be mounted on the vehicle body adjacent to the pneumatic tire; and a controller connected to said excitation unit and operable so as to supply an excitation signal to said excitation unit in order to enable said excitation unit to co-act with said resonant switching device by virtue of mutual induction according to the impedance state of said resonant switching device for inducing current in said resonant switching device as said resonant switching device is moved so as to be proximate with said excitation unit due to rotation of the pneumatic tire relative to the vehicle body, said controller monitoring an output signal from said excitation unit and detecting presence of a change in the output signal of said excitation unit due to inducing of the current in said resonant switching device during a complete cycle of rotation of the pneumatic tire to enable said controller to determine the pressure condition in the pneumatic tire. - View Dependent Claims (28, 29, 30, 31)
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Specification