INTRODUCTION The vehicle safety issue has always been of great concern to the public as well as vehicle manufacturers. For this purpose, the tire plays a major role in electronic driver- assistance systems, as it is the only link between the vehicle and the road surface. The vehicle active safety system can help prevent accidents by providing the driver with better means of vehicle control, such as Anti-lock Braking System (ABS), which can prevent the tire from locking up and thus prevent skidding during braking. In order to achieve the functions of a vehicle active safety system, the vehicle dynamics control system needs accurate and reliable information about the tire working conditions. Instead ofplaying a passive role in the vehicle system, the incorporation of different sensors in the tire would enable it to play an active role with the capability to provide useful information including tire/road contact forces, road conditions and driving conditions to the vehicle dynamics control systems, such as ABS, Traction Control System (TCS), Vehicle Stability Control System (VSCS), Suspension Control System (SCS), etc. Such an “intelligent tire”, equipped with sensors, could contribute greatly to accident prevention and thus enhance the tire's important role in improving vehicle safety. In 2002, the USA passed the Tread Act [ 1] to require installation of Tire Pressure Monitoring System (TPMS) to warn the driver if a tire is significantly under-inflated. This legislation could be considered as the first major step in the 2013-01-0633 Published 04/08/2013 Copyright © 2013 SAE International doi:10.4271/2013-01-0633 saepcmech.saejournals.org Experimental Investigation of Tire Dynamic Strain Characteristics for Developing Strain-Based Intelligent Tire System Xiaoguang Yang and Oluremi Olatunbosun Univ of Birmingham Daniel Garcia-Pozuelo Ramos Universidad Carlos III de Madrid, Spain Emmanuel Bolarinwa Federal Highway Administration ABSTRACT The increasing demand for ground vehicles safety has led to the requirements for effective and accurate vehicle active safety systems, such as Anti-lock Braking System (ABS) and Traction Control System (TCS). As the only link between vehicle and road, the tire is in a very privileged position in a vehicle to acquire vital information which could be used to improve vehicle dynamics control systems. Hence the requirement for an “intelligent tire” that incorporates a system that is able to sense the tire and road conditions, and then interact with the vehicle dynamics control system to optimize the vehicle performance as well as provide warning information to the driver. In this paper, an experimental tire strain-based system is used to establish the proof of concept of an intelligent tire prototype. This experimental system comprises a data acquisition device and three rectangular rosette strain sensors, which can measure the tire surface dynamic strain in real time. Indoor tire rolling tests including steady state straight line and cornering are used to demonstrate the feasibility of the measuring tire strain history with a view to determining tire dynamic strain characteristics. Tire dynamic strain characteristics are extracted and analyzed with respect to the variation of tire operational conditions, such as inflation pressure, rolling speed and pre-loading. These relationships between dynamic strain characteristics and tire operational conditions indicate potential application of tire strain measurement in estimating tire behavior. CITATION: Yang, X., Olatunbosun, O., Garcia-Pozuelo Ramos, D. and Bolarinwa, E., "Experimental Investigation of Tire Dynamic Strain Characteristics for Developing Strain-Based Intelligent Tire System," SAE Int. J. Passeng. Cars - Mech. Syst. 6(1):2013, doi:10.4271/2013-01-0633. ____________________________________ 97Downloaded from SAE International by Univ of Nottingham - Kings Meadow Campus, Thursday, August 09, 2018development of the intelligent tire. Likewise, s