Tire pressure detecting apparatus and monitoring apparatus
First Claim
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1. A tire pressure detector of an automobile, comprising:
- a magnet having N and S poles and rotated by a pneumatic pressure in a tire to revolve the N and S poles;
detecting means, arranged opposite to the magnet, for detecting magnetism and outputting a voltage signal changed to different magnetism level in accordance with rotation of the magnet; and
determining means for comparing the voltage signal with a positive or negative threshold value and determining whether the pneumatic pressure in the tire is within a suitable range, based on a polarity of the voltage signal represented by a comparison result.
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Abstract
A tire pressure detector of an automobile, comprises a magnet having N and S poles and rotated in accordance with a pneumatic pressure in a tire, the N and S poles being rotatable in reverse, detecting means, arranged opposite to the magnet, for detecting magnetism and outputting a voltage signal changed to different magnetism level in accordance with rotation of the magnet, and determining means for comparing the voltage signal with a positive or negative threshold value and determining whether the pneumatic pressure in the tire is within a suitable range, based on a polarity of the voltage signal represented by a comparison result.
34 Citations
4 Claims
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1. A tire pressure detector of an automobile, comprising:
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a magnet having N and S poles and rotated by a pneumatic pressure in a tire to revolve the N and S poles; detecting means, arranged opposite to the magnet, for detecting magnetism and outputting a voltage signal changed to different magnetism level in accordance with rotation of the magnet; and determining means for comparing the voltage signal with a positive or negative threshold value and determining whether the pneumatic pressure in the tire is within a suitable range, based on a polarity of the voltage signal represented by a comparison result. - View Dependent Claims (4)
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2. A tire pressure detector of an automobile, comprising:
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a magnet having N and S poles and rotated by a pneumatic pressure in a tire to revolve the N and S poles; detecting means, arranged opposite to the magnet, for detecting magnetism and outputting a voltage signal at the N and S poles on a level corresponding to a rotation angle of the magnet; and calculating means for calculating the pneumatic pressure in the tire based on a ratio of a positive peak value to a negative peak value of the voltage signal. - View Dependent Claims (3)
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Specification