Transmitter for tire condition monitoring apparatus and the tire condition monitoring apparatus
First Claim
1. A transmitter for a tire condition monitoring apparatus, wherein the transmitter is located in a tire of a vehicle and transmits data indicating the tire condition using a carrier wave, the transmitter comprising:
- an oscillating circuit, which generates a carrier wave frequency, wherein said oscillating circuit has a predetermined characteristic carrier wave frequency, which corresponds to a carrier wave frequency actually generated by the oscillating circuit when an ambient temperature of the oscillating circuit is at a predetermined reference temperature; and
a controller, wherein the controller corrects the generated carrier wave frequency in accordance with the difference between the characteristic carrier wave frequency and a predetermined reference carrier wave frequency.
2 Assignments
0 Petitions
Accused Products
Abstract
A transmitter for a tire condition monitoring apparatus is located in a tire of a vehicle and transmits data indicating the tire condition using a carrier wave. The transmitter includes an oscillating circuit and a controller. The oscillating circuit generates a carrier wave frequency and has a predetermined characteristic carrier wave frequency. The controller corrects the generated carrier wave frequency in accordance with the difference between the characteristic carrier wave frequency and a predetermined reference carrier wave frequency.
11 Citations
9 Claims
-
1. A transmitter for a tire condition monitoring apparatus, wherein the transmitter is located in a tire of a vehicle and transmits data indicating the tire condition using a carrier wave, the transmitter comprising:
-
an oscillating circuit, which generates a carrier wave frequency, wherein said oscillating circuit has a predetermined characteristic carrier wave frequency, which corresponds to a carrier wave frequency actually generated by the oscillating circuit when an ambient temperature of the oscillating circuit is at a predetermined reference temperature; and
a controller, wherein the controller corrects the generated carrier wave frequency in accordance with the difference between the characteristic carrier wave frequency and a predetermined reference carrier wave frequency. - View Dependent Claims (2, 3, 4)
-
-
5. A tire condition monitoring apparatus comprising:
-
a transmitter located in a tire of a vehicle;
a tire condition sensor for detecting the condition of the tire of the vehicle;
a transmission circuit for transmitting data indicating the tire condition detected by the tire condition sensor using a carrier wave;
an oscillating circuit, which generates a carrier wave frequency, wherein said oscillating circuit has a predetermined characteristic carrier wave frequency, which corresponds to a carrier wave frequency actually generated by the oscillating circuit when an ambient temperature of the oscillating circuit is at a predetermined reference temperature;
a controller, which corrects the generated carrier wave frequency in accordance with the difference between the characteristic carrier wave frequency and a predetermined reference carrier wave frequency; and
a receiver located in a vehicle body of the vehicle, wherein the receiver receives data indicating the tire condition transmitted from the transmitter. - View Dependent Claims (6, 7, 8)
-
-
9. A transmitter for a tire condition monitoring apparatus, wherein the transmitter is located in a tire of a vehicle and transmits data indicating the tire condition using a carrier wave, the transmitter comprising:
-
an oscillating circuit, which generates a carrier wave frequency, wherein said oscillating circuit has a predetermined characteristic carrier wave frequency, which corresponds to a carrier wave frequency actually generated by the oscillating circuit when an ambient temperature of the oscillating circuit is at a predetermined reference temperature;
a temperature sensor for detecting the internal temperature of the tire; and
a controller, wherein the controller performs a primary correction on the generated carrier wave frequency based on a frequency deviation caused by manufacturing tolerance of the oscillating circuit in accordance with a correction data, the correction data being the difference between the characteristic carrier wave frequency and a predetermined reference carrier wave frequency, and wherein the controller further performs a secondary correction on the generated carrier wave frequency that has been through the primary correction in accordance with the internal temperature detected by the temperature sensor.
-
Specification