Sumitomo Rubber Industries Ltd announced a technology to estimate the slipperiness of a road surface by using tires while the vehicle is running May 16, 2017.
Sumitomo Rubber Industries demonstrated the technology, "Sensing Core," at a press meeting that the company had in Ibaraki Prefecture, Japan, on the same day. The technology does not require the addition of sensors. It is proposing automakers that they employ the Sensing Core, aiming to commercialize the technology in 2020.
DWS (Deflation Warning System)
Sumitomo Rubber Industries has been selling the "DWS (Deflation Warning System)," a device that warns of a lowered tire pressure, for about 20 years, and the devices has been installed in 25 million vehicles mainly in the US. The device estimates a decrease in tire pressure from the rotation speed and vibration frequency change of tires and shows a warning on the center meter for the driver.
When the air pressure of a tire decreases, its rolling distance per rotation becomes shorter. So, when it is compared with the rolling distance in normal situations, the decrease in tire pressure can be detected. Also, the vibration frequency of each tire is measured, and a decrease in air pressure is detected based on the change in frequency.
Based on the DWS, Sumitomo Rubber Industries developed the new technology that can estimate the slipperiness of a road surface. It compares data collected on a non-slip road such as an asphalt road with data collected on a slippery road. On a slippery road, the rotation speed of tires slightly increases, depending on the vehicle speed, and the vibration frequency also changes.