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This paper discusses the key components of a new electronically controlled air suspension system developed by Nissan Motor Co. The system utilizes a very soft spring rate, and effectively controls the spring rate and the damping coefficient to achieve high suspension performance. As a result, this system improves both riding comfort and vehicle controllability, two factors that normally conflict with each other. The soft spring rate delivers a comfortable ride, and accurate controllability prevents the vehicle's attitude from changing significantly during roiling, braking and accelerating.