Tire-side device and tire apparatus including the same
AssigneesSoken, Inc., Denso Corporation
InventorsYoichiro SUZUKI, Takatoshi SEKIZAWA, Masashi MORI
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Abstract
A tire-side device is attached to a tire included in a vehicle and applied to a tire apparatus for estimating a condition of a road surface on which the vehicle travels. The tire-side device includes: a vibration detector outputting a detection signal according to a level of vibration of the tire; a controller having a feature quantity extraction device extracting a feature quantity of the detection signal in one rotation of the tire; and a transmitter transmitting road surface data including the feature quantity extracted by the feature quantity extraction device.
Claims6
A tire-side device attached to a tire included in a vehicle and applied to a tire apparatus for estimating a condition of a road surface on which the vehicle travels, the tire-side device comprising:
- a vibration detector configured to output a detection signal according to a level of vibration of the tire;
- a controller that includes a feature quantity extraction device configured to extract a feature quantity of the detection signal in one rotation of the tire;
- and
- a transmitter configured to transmit road surface data including the feature quantity extracted by the feature quantity extraction device,
- wherein the feature quantity extracted by the feature quantity extraction device at a past rotation of the tire is a past feature quantity,
- wherein the feature quantity extracted by the feature quantity extraction device at a present rotation of the tire is a present feature quantity,
- wherein the controller further includes:
- a feature quantity storage configured to store the past feature quantity;
- a variation determination device configured to determine that a variation occurs in the condition of the road surface, based on the past feature quantity and the present feature quantity;
- and
- a transmission controller configured to control transmission of the road surface data and cause the transmitter to transmit the road surface data including the present feature quantity, in response to that the variation determination device determines that the variation occurs in the condition of the road surface.
A tire-side device comprising:
- a vibration detector configured to output a detection signal according to a level of vibration of a tire included in a vehicle;
- a controller configured to extract a feature quantity of the detection signal in one rotation of the tire;
- and
- a transmitter configured to transmit road surface data including the feature quantity extracted by the feature quantity extraction device,
- wherein the feature quantity extracted by the controller at a past rotation of the tire is a past feature quantity,
- wherein the feature quantity extracted by the controller at a present rotation of the tire is a present feature quantity, and
- wherein the controller is further configured to:
- store the past feature quantity;
- determine that a variation occurs in the condition of the road surface, based on the past feature quantity and the present feature quantity;
- and
- control transmission of the road surface data and cause the transmitter to transmit the road surface data including the present feature quantity, in response to determining that the variation occurs in the condition of the road surface.
Dependencies are inferred from the claim text.