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In this paper, the hardware-in-the loop simulator which is used for evaluating performance of the EPS (Electric Power Steering) system has been developed. The HILS system consists of the steering system of the light commercial vehicle - the steering wheel, the EPS module, the universal joint, and the rack bar. These components were placed in proper spaces based on location of their hard points in an actual vehicle. An electric servo motor has been used for generating the road reaction force which is generated by vehicle's kingpin moment. A real-time simulation environment has been developed using CarSim to evaluate performance of EPS through various handling tests. For verifying reliability of the HILS system, various handling tests were performed and compared with the results of actual vehicle tests in the proving ground. Through the developed EPS HILS system, various handling tests were successfully performed in the laboratory.

In this paper, we suggest a new control algorithm for driver's intention judgment for collision avoidance using a steering system to improve the emergency steering system performance. Most of the collision avoidance systems proposed by previous works relied only on the braking systems. Recently the automotive industry began to consider ways to avoid collisions using the steering system. It is not hard to imagine that any steering-assisted collision avoidance algorithm must judge a driver's intention for lane change before any attempt at longitudinal avoidance is made. To improve the accuracy of driver's intention judgment and thus the performance of the emergency steering system, we developed a new algorithm based on on-center handling characteristics generated by the steering system. The performance of the proposed driver's intention algorithm was validated in the test of real vehicles as well as in the SILS environment.