Bridgestone Corporation

Kabushiki Kaisha Bridgestone

Hiromitsu Ichikawa

Hiromasa Hada

Takao Kokubu

Masaharu Oku

Toshihiro Miyazaki

Hajime Fukumori

A tire air pressure monitoring system includes: a data acquisition unit that acquires tire air pressure data at each fixed detection period; a storage unit that stores newly acquired air pressure data P(), and air pressure data P() to P(N) acquired 1 to N periods prior to the air pressure data P(); a determination unit that determines a state in which air pressure has decreased, on the basis of air pressure data; and a communication unit that transmits a determination result of the determination unit to an external device, in which the determination unit compares each piece of the air pressure data P() to P(n) with the air pressure data P() to calculate decrease values, compares the decrease values with a preset first threshold value (th), and determines that tire air pressure is decreasing when at least one decrease value is greater than or equal to the first threshold value.

Tire air pressure monitoring system and tire air pressure monitoring program

A tire pressure measuring apparatus provides a warning of an error of a tire air pressure measuring module only when it is not that determined a vehicle stops and also any on of receivers has not received an air pressure data signal for an error determining duration. Therefore, a probability of a false warning can be reduced.

Tire air pressure measuring apparatus which reduces the probability of false warnings

A tire sensor device comprising sensor modulesA toD, each comprising a sensor, a communication module having a communication function and a power regenerating circuit, and an antenna; and a base station comprising an internal communication device for communication with the sensor modulesA toD, an information processing device for processing tire information signals from the sensor modules, an external communication device for communicating with a car control deviceon the car body side and a power source. The sensor modulesA toD and the base stationare arranged in the tire and constitute an intra-tire LAN. Tire information signals transmitted from the sensor modulesA toD are processed by the base stationand transmitted to the car control deviceso that appropriate tire information can be obtained and the size and power consumption of the sensor device can be reduced.

Tire sensor device and tire information transmission method

The present invention includes a sensor malfunction determination unitdetects the pressure value corresponding to a signal outputted by a pressure sensorcapable of measuring the internal pressure of a pneumatic tire. When the detected pressure value is decreasing along the time axis, the sensor malfunction determination unitdetermines that the pressure sensoris not malfunctioning.

Sensor malfunction determination device and sensor malfunction determination method

A tire wear detection system includes a detection unit () which detects acceleration applied to a wear bar () arranged in a groove of a tread section of a pneumatic tire (), and a wear judgment unit () which judges that a tire has been worn based on the acceleration detected by the detection unit ().

Tire wear detection system and pneumatic tire

A pneumatic-tire-use electronic-device fixing system according to the present invention includes: an electronic-device housing apparatus, which houses the electronic device, and which includes an engaging convex portionthat is convex; and an electronic-device housing apparatus support, which is provided on an inner surface of the pneumatic tire, and which includes an engaging concave portion that is concave. First pullout suppression means which suppresses pullout of the engaging convex portion from the engaging concave portion is provided on at least a part of a surface of the engaging convex portion, and second pullout suppression means which engages with the first pullout suppression means is provided on at least a part of a surface of the engaging concave portion. According to the present invention, it becomes possible to provide a pneumatic-tire-use electronic-device fixing system, a pneumatic tire, and an electronic-device housing apparatus, which are capable of securely fixing the pneumatic-tire-use electronic device, and also capable of suppressing breakage of a fixing portion for fixing a pneumatic-tire-use electronic device.

Growing community of inventors

Kodaira, Japan

Hiromitsu Ichikawa