Air pressure detection device for tire
First Claim
1. An air pressure detection device for a tire comprising:
- an air pressure sensor for measuring the air pressure of a tire;
a temperature sensor for measuring the temperature at a predetermined portion in said tire;
a reduced air pressure arithmetic means for calculating a reduced air pressure from the air pressure measured by said air pressure sensor and the temperature measured by said temperature sensor; and
an alarm signal generating means for generating an alarm signal when the reduced air pressure calculated by said reduced air pressure arithmetic means is lowered to or below a predetermined first threshold value.
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Accused Products
Abstract
A vehicle is provided with an air pressure detection device for a tire which includes a temperature sensor for measuring the temperature of a tire and an air pressure sensor for measuring the air pressure of the tire. A reduced air pressure arithmetic portion is provided for calculating a reduced air pressure Pm from the temperature Tx measured by the temperature sensor and the air pressure Px measured by the air pressure sensor by the formula set forth below. An alarm signal generating portion is provided for generating an alarm signal when the reduced air pressure Pm calculated by the reduced air pressure arithmetic portion is decreased to or below a first threshold value Pa.
Pm=Px−K(Tx−T0)
The condition where the tire air pressure is lowered to or below a threshold value determined based on a recommended air pressure can be accurately detected, and an alarm can be issued, without being affected by tire temperature rise or temperature variations.
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Citations
14 Claims
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1. An air pressure detection device for a tire comprising:
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an air pressure sensor for measuring the air pressure of a tire;
a temperature sensor for measuring the temperature at a predetermined portion in said tire;
a reduced air pressure arithmetic means for calculating a reduced air pressure from the air pressure measured by said air pressure sensor and the temperature measured by said temperature sensor; and
an alarm signal generating means for generating an alarm signal when the reduced air pressure calculated by said reduced air pressure arithmetic means is lowered to or below a predetermined first threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An air pressure detection device for a tire comprising:
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an air pressure sensor for measuring air pressure of a tire;
a temperature sensor for measuring temperature of a tire;
means for calculating a reduced/increased air pressure as compared to the air pressure measured by said air pressure sensor and a reduced/increased temperature measured by said temperature sensor; and
an alarm signal generating means for generating an alarm signal when the reduced/increased air pressure calculated by said means for calculating a reduced/increased air pressure is lowered/higher a predetermined threshold value. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification