Siemens VDO is developing the next generation of tyre pressure monitoring systems, which monitor the tyres and transmit safety-related information directly to the vehicle and driver. The new system uses a piezo element to supply the electrical energy, as opposed to a traditional battery.
Today's conventional tyre pressure monitoring systems measure tyre pressure and temperature directly at the valve and use a radio frequency to transmit the data to an antenna on the side of the vehicle. Siemens VDO's new Intelligent Tyre System (ITS) integrates the sensor, communications system, identification electronics and processing in a single module located directly in the tyre.
The ITS automatically detects tyre data and transfers the data to the system controls. When necessary, the driver receives critical tyre information, such as the tyre pressure and the vehicle's load status. To support optimised functioning of these systems, important tyre status information also can be transmitted to other electronic vehicle systems, such as the braking assistant, stability control, or the drive control system. The company plans to integrate the ITS into car-to-car communication and mobile safety networks. For example, a tyre equipped with ITS could collect road grip data and transmit the information to other drivers alerting them of road conditions - making the tyre intelligent.
Intelligent tyres provide realtime operating information to the driver
In addition, Siemens VDO's ITS utilises a piezo element to replace the battery. Piezo-electricity is a crystal's ability to generate a voltage in response to applied mechanical stress. The piezo-electric effect is reversible in that piezo-electric crystals, when subjected to an externally applied voltage, can change shape by a small, precise and repeatable amount. Siemens VDO is a pioneer in piezo technology for automotive applications and offers piezo injectors for both diesel and petrol direct injection. In the piezo direct injection applications, piezo actuators help ensure fuel quantity by directly injecting a very precise dosage of fuel. With the ITS, the piezo effect is used to generate the electrical energy for the system through the rotation of the tyre. The first generation of the ITS will be ready for series production in 2011.
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