INFLUENCE OF A RELIEF VALVE ON THE PERFORMANCE OF A PUMP INVERTER CONTROLLED HYDRAULIC MOTOR SYSTEM

The influence of the relief valve, which is used as a safety valve, on the performances of a pump/inverter controlled hydraulic motor system is discussed. The mathematical models are derived, and then the optim ization technique is used to identify the system parameters. A series of simulations and experiments are performed; the results show that a better simulation result can be obtained if the relief valve character istics are considered in the system model, and adverse influence of th e relief valve on the performance of the pump or inverter controlled h ydraulic motor system can be avoided if a self-tuning adaptive control ler is employed.