公开(公告)号：US20190225227A1

公开(公告)日：2019-07-25

申请号：US16313069

申请日：2017-06-23

Applicant: DENSO CORPORATION

Inventor： Masashi MORI ,  Takatoshi SEKIZAWA ,  Ryosuke KANBAYASHI

IPC: B60W40/06 ,  G01C7/02 ,  B60C19/00

Abstract: When a road surface condition does not change, road surface data is transmitted by a tire-mounted sensor at a rate of once every time a tire rotates a plurality of times, in order to reduce the power consumption from a power source. Further, when the road surface condition changes, the road surface data is transmitted by the tire-mounted sensor with a transmission interval that is shorter than when the road surface condition does not change. In this way, reducing the amount of road surface data that is transmitted when the road surface condition does not change makes it possible to reduce the amount of power required for data transmission. Further, using a transmission interval that is shorter when the road surface condition changes than when the road surface condition does not change makes it possible for changes in the road surface condition to be conveyed rapidly to a vehicle body side system.

公开(公告)号：US20190176834A1

公开(公告)日：2019-06-13

申请号：US16323830

申请日：2017-06-23

Applicant: DENSO CORPORATION

Inventor： Ryosuke KANBAYASHI ,  Takatoshi SEKIZAWA ,  Masashi MORI

IPC: B60W40/068 ,  B60T8/172 ,  B60C23/06

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.

公开(公告)号：US20190143988A1

公开(公告)日：2019-05-16

申请号：US16243121

申请日：2019-01-09

Applicant: DENSO CORPORATION

Inventor： Takatoshi SEKIZAWA ,  Masashi MORI ,  Ryosuke KANBAYASHI

IPC: B60W40/06 ,  B60C19/00 ,  G01H1/00

Abstract: A tire-mounted sensor is mounted to a rear surface of a tread of a tire. the tire-mounted sensor includes: a vibration detector, a signal processor, a transmitter, and an activation controller. The vibration detector outputs a detection signal according to amplitude of a vibration of the tire. The signal processor extracts a ground contact section during which the portion of the tread provided with the vibration sensor is in contact with the ground, from the detection signal, and generates a road surface data based on the detection signal during the ground contact section. The transmitter transmits the road surface data. The activation controller starts an activation of the signal processor at a time in association with the ground contact starting time at which the portion of the tread provided with the vibration detector begins to be in contact with the ground.

公开(公告)号：US20190143987A1

公开(公告)日：2019-05-16

申请号：US16243113

申请日：2019-01-09

Applicant: DENSO CORPORATION

Inventor： Takatoshi SEKIZAWA ,  Ryosuke KANBAYASHI ,  Masashi MORI

IPC: B60W40/06 ,  B60C19/00 ,  G01H1/00

Abstract: A tire-mounted sensor includes a vibration detector, an acceleration sensor, a signal processor, and a transmitter. The vibration detector outputs a detection signal according to amplitude of a vibration of the tire. The acceleration outputs a detection signal according to an acceleration of the tire in a radial direction. The signal processor detects a rotational angle of the tire reaching a ground angle during each rotation of the tire, sets a measurement period including a time period during which the rotational angle of the tire is at the ground angle, extracts a ground contact section during which the portion of the tread provided with the vibration sensor is in contact with the ground, in the measurement period, and generates a road surface data based on the detection signal output from the vibration detector during the ground contact section. The transmitter transmits the road surface data.