We first define the general concept of active suspension and how It differs from a passive one (spnngs and shock absorbers) This device necessitates measurements of absolute and relative quantltles such as positIon, acceleration and velocity to perform a control strategy Then we denve our concept of a low-frequency active suspension, whnzh IS a restricted development This step allows us to exhibit the reqmred mformatlon (wheel-body velocity and pos:tlon) The wheel-body posltlon results from constructlon, hence only one problem remains to be solved We discuss advantages and drawbacks of different kinds of sensors (accelerometers, gyrometers, longtudmal velocity meters or posltlon sensors) satlsfymg the requirements We pomt out that gyrometers are the best avadable sensors for our apphcatlon We bnefly descnbe the gyrometer (prmaple, performance) we use m this case We descnbe our expenments (environmental condltlons, choice of relevant parameters for assessment, vehicle unplementatlon and data-acqmsltlon system) We discuss the results obtamed with on-board steady-state testmg We assess the Improvement acheved by such an active suspension compared with a standard one Both vehicles used are of the same type (Citroen BX) We conclude by dtscussmg the hmltatlons of this system and the Improvements needed to design an automotlve product Citroen et conceptlon d'une suspension a correction d'asslette active, These,