The platform with digital cylinder avoids lots of hydraulic servo parameter adjusting devices and A/D, D/A data conversion devices. Therefore it can be regarded as an open loop control for developers.

Some faults such as amplifier offset, parameter changes, servo valve backlash and sensor fault are seeded in a virtual way by means of different switches in Simulink.

This paper proposes the order and parameter identification of electro-hydraulic servo system by multi-variable time series CAR.