This paper presents, in 2 parts, a control law for a low frequency active suspension system. The first part, talks about the problematics, the strategy and the modelling. The control part and the results of the simulations are presented in the second part. More precisely, after the presentation of the problematics, the strategy which allows to get around the conflict of the passive suspensions is exposed in this first paper. Then, the hydropneumatic suspension which allows the implementation of this strategy is presented. It is composed of one hydractive part and one low frequency active part. Finally the validation and synthesis models are developed; their exploitation is made in the second paper.

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