This paper presents a measurement method of the normalized equivalent cornering stiffness (normalized C_p), which dominates a vehicle's steering responses. First, the method measures rear normalized C_p from the velocity at which the sign of vehicle slip angle is reversed in steady-state turning. The method is accurate because the velocity is independent of the errors of measuring instruments. Second, the method measures front normalized C_p from yaw velocity gain. Last, the measured normalized C_p's of various vehicles are potted on a distribution map, which indicates steering responses of each vehicle.
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