Tire state monitoring system and tire state monitoring method
AssigneeBridgestone Corporation
InventorHiromitsu Ichikawa
Life of this patent
Estimating the term…
Abstract
A tire state monitoring system comprises an acquisition device and a control device. The acquisition device is configured to repeatedly acquire a pressure and temperature inside a tire. The control device is configured to: calculate, based on ratios between the pressure and temperature acquired in a first period, a representative value of the ratios in the first period; and compare a ratio between the pressure and temperature acquired in a second period after the first period with the representative value, to determine whether the pressure inside the tire has dropped.
Claims20
A tire state monitoring system comprising an acquisition device and a control device,
- wherein the acquisition device comprises a pressure sensor, a temperature sensor, and a first communication module;
- the acquisition device is configured to repeatedly acquire, by the pressure sensor, a pressure inside a tire, acquire, by the temperature sensor, temperature inside the tire, and transmit, by the communication module, data including the pressure and the temperature inside the tire,
- the control device comprises a second communication module,
- the control device is configured to:
- repeatedly receive, by the second communication module, the data including the pressure and the temperature inside the tire;
- calculate, based on ratios between the pressure and temperature acquired in a first period, a representative value of the ratios in the first period;
- compare a ratio between the pressure and temperature acquired in a second period after the first period with the representative value, to determine whether the pressure inside the tire has dropped;
- and
- communicate with a computer by the second communication module to cause the computer to notify that the pressure inside the tire has dropped;
- wherein the control device is configured to set, as the representative value, one of:
- a lowest ratio of the pressure to temperature from among the ratios between the pressure and temperature acquired in the first period,
- a statistical value based on values of a predetermined range in order from a lowest ratio of the pressure to the temperature from among the ratios between the pressure and temperature acquired in the first period,
- a statistical value based on values of a predetermined range not including a lowest value in ascending order of a ratio of the pressure to temperature from among the ratios between the pressure and temperature acquired in the first period, or
- a ratio between the pressure and temperature at a lowest temperature from among the ratios between the pressure and temperature acquired in the first period.
A tire state monitoring method executed by a tire state monitoring system comprising an acquisition device and a control device, wherein the acquisition device comprises a pressure sensor, a temperature sensor, and a first communication module;
- and wherein the control device comprises a second communication module, the method comprising:
- repeatedly acquiring, by the acquisition device via the pressure sensor, a pressure inside a tire and acquiring, by the acquisition device via the temperature sensor, a temperature inside the tire, and transmitting, by the acquisition device via the communication module, data including the pressure and the temperature inside the tire;
- repeatedly receiving, by the control device via the second communication module, the data including the pressure and the temperature inside the tire;
- calculating, by the control device, based on ratios between the pressure and temperature acquired in a first period, a representative value of the ratios in the first period;
- comparing, by the control device, a ratio between the pressure and temperature acquired in a second period after the first period with the representative value, to determine whether the pressure inside the tire has dropped;
- and
- communicating, by the control device with a computer via the second communication module, to cause the computer to notify that the pressure inside the tire has dropped;
- wherein the method further comprises setting by the control device, as the representative value, one of:
- a lowest ratio of the pressure to temperature from among the ratios between the pressure and temperature acquired in the first period,
- a statistical value based on values of a predetermined range in order from a lowest ratio of the pressure to the temperature from among the ratios between the pressure and temperature acquired in the first period,
- a statistical value based on values of a predetermined range not including a lowest value in ascending order of a ratio of the pressure to temperature from among the ratios between the pressure and temperature acquired in the first period, or
- a ratio between the pressure and temperature at a lowest temperature from among the ratios between the pressure and temperature acquired in the first period.
Dependencies are inferred from the claim text.