To meet the auto-leveling system's precision and leveling-time request, the platform use mechanical-electronicservo control system and AC servo technique.
It is then modified by signals received from the EV-1 via the ElectronicServo Valve to create the desired steady or non-steady extravascular chamber pressures.
This paper presents a new type of ElectronicServo valve (ESV) which includes the pulse width modulator, electro-mechanical actuator and variable section area valves.