Honda Motor Co., Ltd.

Goro Komatsu

Makoto Bessho

Mikio Kashiwai

Hisamitsu Takagi

Yousuke Sekino

Yasunori Yoshimura

Toshiyuki Hosokawa

A sensor unit includes a sensor body consisting of a detecting part which detects an inside pressure of a tire, and a transmitting part which transmits a pressure signal detected by the detecting part, and a base member which holds the sensor body. The base member is fixed to a wheel through a heat curable adhesive layer.

Sensor unit

A tire pressure monitoring system having a monitoring unit that receives the output of a transmitted pressure sensor through a receiving antenna, and compares the output with a predetermined value to determine whether the tire pressure is proper, and informs a result of the determination to an operator by an indicator or alarm section connected to an onboard battery through an ignition switch. In the system, an operating switch is installed in a vehicle compartment to be operable by the operator for supplying the operating power to the indicator by connecting it to the battery, while bypassing the ignition switch. Alternatively, a portable terminal device to be carried by the operator is connected to the monitoring unit in such a manner that the monitoring unit transmits the result of the determination to the portable terminal device to inform the result of the determination to the operator by a second indicator provided at the portable terminal device. With this, the operator's work is facilitated when pumping up the tire with insufficient pressure.

Tire pressure monitoring system

A tire pressure monitoring system for monitoring pressure of tires mounted on a vehicle by comparing a detected tire pressure, detected by a pressure sensor installed at each of the tires, with a predetermined value to determine whether the detected tire pressure is proper. The system includes a first temperature sensor that detects internal temperature of the tire, a second temperature sensor that detects ambient temperature at a place where the vehicle locates, and the predetermined value is corrected based on a difference between the detected tire internal temperature and ambient temperature, when the tire pressure is to be adjusted. With this, even if the tire pressure is adjusted when the tire internal temperature is higher than the ambient temperature, the tire pressure can be prevented from falling below the proper pressure when the internal temperature falls to the ambient temperature.

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Saitama, Japan

Goro Komatsu