Road surface state estimation device
AssigneeDenso Corporation
InventorsRyosuke Kanbayashi, Takatoshi Sekizawa, Masashi Mori
Life of this patent
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Abstract
A control unit of a tire-mounted sensor determines whether a tire has been exchanged. When the tire has been exchanged, the control unit changes the threshold value of a road surface state determination condition used for detecting the road surface state from vibration data of the tire detected by an acceleration sensor of the tire-mounted sensor. For example, the threshold value of the road surface state determination condition is reset upon determining that the tire has been exchanged, by transmitting an instruction to the tire-mounted sensor through a tool at an automobile maintenance shop, etc.
Claims12
A road surface state estimation device for estimating a road surface state of a travel road surface of a vehicle, the road surface state estimation device comprising:
- a tire-mounted sensor including a vibration detection sensor for outputting an output voltage corresponding to a magnitude of vibration of a tire as a detection signal, a signal processing unit, including a processor and a memory, for detecting the road surface state from vibration data indicated by the detection signal of the vibration detection sensor and a transmitter unit for transmitting road surface data indicating the road surface state, and attached to a back surface of the tire;
- and
- a vehicle body side system provided in a vehicle body side and including controller for receiving the road surface data transmitted from the transmitter unit and estimating the road surface state based on the road surface data, wherein
- the signal processing unit changes a threshold value of a road surface state determination condition used in detecting the road surface state from the vibration data,
- the tire-mounted sensor includes a receiver for receiving an instruction command transmitted from a tool, and
- the signal processing unit changes the threshold value of the road surface state determination by transitioning to a learning mode upon the receiver receiving the instruction command from the tool.
A road surface state estimation device for estimating a road surface state of a travel road surface of a vehicle, the road surface state estimation device comprising:
- a tire-mounted sensor including a vibration detection sensor for outputting an output voltage corresponding to a magnitude of vibration of a tire as a detection signal, a signal processing unit, including a processor and a memory, for detecting the road surface state from vibration data indicated by the detection signal of the vibration detection sensor and a transmitter unit for transmitting road surface data indicating the road surface state, and attached to a back surface of the tire;
- and
- a vehicle body side system provided in a vehicle body side and including a controller for receiving the road surface data transmitted from the transmitter unit and estimating the road surface state based on the road surface data, wherein
- the controller changes a threshold value of a road surface state determination condition used in detecting the road surface state from the vibration data,
- the tire-mounted sensor includes a receiver for receiving an instruction command transmitted from a tool,
- the signal processing unit transitions to a learning mode upon the receiver receiving the instruction command from the tool, and transmits the road surface data to the vehicle body side system through the transmitter unit, and
- the controller changes the threshold value of the road surface state determination based on the road surface data transmitted from the tire-mounted sensor during a period of the learning mode.
Dependencies are inferred from the claim text.