Tire condition monitoring apparatus
First Claim
1. A tire condition monitoring apparatus for monitoring a condition of a vehicle tire, comprising:
- a transmitter, which is located in the tire and activated by a battery, wherein the transmitter includes;
a tire condition sensor for detecting the condition of the tire;
a transmission circuit for wirelessly transmitting data representing the tire condition;
a voltage sensor, which detects a voltage of the battery; and
an electricity control circuit, wherein, during a period from when the tire condition sensor detects the condition of the tire to when the transmission circuit starts transmitting the data, the electricity control circuit performs a transmission preparation process to gradually increase electricity supplied to the transmission circuit from the battery, thereby gradually increasing a radio wave output of the transmission circuit, and wherein, if the value of the voltage detected by the voltage sensor is lowered to a lowest operation voltage of the transmitter during the transmission preparation process, the electricity control circuit limits the supply of electricity to the transmission circuit from the battery; and
a receiver, which is located in a body of the vehicle and receives data from the transmitter.
1 Assignment
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Accused Products
Abstract
A transmitter has a tire condition sensor, a transmission circuit, a voltage sensor and an electricity control circuit. The tire condition sensor detects the condition of a tire. The voltage sensor detects a voltage of the battery. During a period from when the tire condition sensor detects the condition of the tire to when the transmission circuit starts transmitting the data, the electricity control circuit performs a transmission preparation process to gradually increase electricity supplied to the transmission circuit from a battery, thereby gradually increasing a radio wave output of the transmission circuit. If the value of the voltage detected by the voltage sensor is lowered to a lowest operation voltage of the transmitter during the transmission preparation process, the electricity control circuit limits the supply of electricity to the transmission circuit from the battery.
9 Citations
11 Claims
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1. A tire condition monitoring apparatus for monitoring a condition of a vehicle tire, comprising:
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a transmitter, which is located in the tire and activated by a battery, wherein the transmitter includes;
a tire condition sensor for detecting the condition of the tire;
a transmission circuit for wirelessly transmitting data representing the tire condition;
a voltage sensor, which detects a voltage of the battery; and
an electricity control circuit, wherein, during a period from when the tire condition sensor detects the condition of the tire to when the transmission circuit starts transmitting the data, the electricity control circuit performs a transmission preparation process to gradually increase electricity supplied to the transmission circuit from the battery, thereby gradually increasing a radio wave output of the transmission circuit, and wherein, if the value of the voltage detected by the voltage sensor is lowered to a lowest operation voltage of the transmitter during the transmission preparation process, the electricity control circuit limits the supply of electricity to the transmission circuit from the battery; and
a receiver, which is located in a body of the vehicle and receives data from the transmitter. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A transmitter, which is located in a tire of a vehicle and activated by a battery, the transmitter comprising:
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a tire condition sensor for detecting the condition of the tire;
a transmission circuit for wirelessly transmitting data representing the tire condition;
a voltage sensor, which detects a voltage of the battery; and
an electricity control circuit, wherein, during a period from when the tire condition sensor detects the condition of the tire to when the transmission circuit starts transmitting the data, the electricity control circuit performs a transmission preparation process to gradually increase electricity supplied to the transmission circuit from the battery, thereby gradually increasing a radio wave output of the transmission circuit, and wherein, if the value of the voltage detected by the voltage sensor is lowered to a lowest operation voltage of the transmitter during the transmission preparation process, the electricity control circuit limits the supply of electricity to the transmission circuit from the battery. - View Dependent Claims (8, 9, 10)
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11. A transmitter, which is located in a tire of a vehicle and activated by a battery, the transmitter comprising:
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a tire condition sensor for detecting the condition of the tire;
a transmission circuit for wirelessly transmitting data representing the tire condition;
a voltage sensor, which detects a voltage of the battery; and
an electricity control circuit, wherein, after the tire condition sensor detects the condition of the tire, the electricity control circuit gradually increases electricity supplied to the transmission circuit from the battery, thereby gradually increasing a radio wave output of the transmission circuit, and wherein, if the value of the voltage detected by the voltage sensor reaches a lowest operation voltage before the value of the radio wave output reaches a predetermined value, the electricity control circuit limits the supply of electricity to the transmission circuit from the battery, such that the transmission circuit performs transmission at a radio wave output that is less than the predetermined value.
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Specification