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An important factor in the development of vehicle suspensions has been how to get higher performance from both ride and stability, which are normally in conflict. In addressing this problem, we analyzed the optimum damping forces of shock absorbers for various driving conditions and developed an electronically controlled shock absorber system, which we call “Super Sonic Suspension” based on the results. Through this microcomputer-controlled system, we achieved a great improvement in riding comfort by being able to the damping force much lower than before, based on the results of said analysis. At the same time, stability of the vehicle was also improved by optimumly controlling the damping force for various driving conditions through signals from a newly developed road sensor, which utilizes supersonic waves, and other sensors.

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.