Tire air pressure monitoring device
First Claim
1. A tire air pressure monitoring device comprising:
- an air pressure sensor that detects a tire air pressure as an air pressure of a tire of a vehicle;
a temperature sensor that detects a tire temperature as a temperature of the tire; and
a warning control unit that is configured tostart giving a driver a warning that the tire air pressure has fallen, when the detected tire air pressure is equal to or lower than a first threshold that is a constant value unrelated to the detected tire temperature,acquire the tire temperature detected at a moment of start of the warning, as a warning issuance temperature,set a value obtained by adding a variable value, which is obtained by adding a positive constant value to a value that increases as a temperature difference obtained by subtracting the warning issuance temperature from the currently detected tire temperature increases, to the first threshold, as a second threshold, andstop the warning when the detected tire air pressure becomes equal to or higher than the second threshold in a case where the warning is being given.
1 Assignment
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Accused Products
Abstract
A warning control unit of this tire air pressure monitoring device starts giving a driver a tire air pressure fall warning when a tire air pressure is equal to or lower than a first threshold. The warning control unit stops the warning when the tire air pressure becomes equal to or higher than a second threshold that is set based on a tire temperature in a case where the warning is being given. The warning control unit uses a constant value unrelated to a detected tire temperature as the first threshold, and uses a value obtained by adding a variable value, which is obtained by adding a positive constant value to a value that increases as a temperature difference obtained by subtracting a tire temperature at the time of the issuance of the warning from a current tire temperature increases, to the first threshold, as the second threshold.
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Citations
4 Claims
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1. A tire air pressure monitoring device comprising:
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an air pressure sensor that detects a tire air pressure as an air pressure of a tire of a vehicle; a temperature sensor that detects a tire temperature as a temperature of the tire; and a warning control unit that is configured to start giving a driver a warning that the tire air pressure has fallen, when the detected tire air pressure is equal to or lower than a first threshold that is a constant value unrelated to the detected tire temperature, acquire the tire temperature detected at a moment of start of the warning, as a warning issuance temperature, set a value obtained by adding a variable value, which is obtained by adding a positive constant value to a value that increases as a temperature difference obtained by subtracting the warning issuance temperature from the currently detected tire temperature increases, to the first threshold, as a second threshold, and stop the warning when the detected tire air pressure becomes equal to or higher than the second threshold in a case where the warning is being given. - View Dependent Claims (2, 3, 4)
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Specification