Identification and PID parameters setting of the hydraulic system for asphalt mortar car

The hydraulic system for asphalt mortar car is difficult to control precisely.Empirical method and hydraulic system theoretical knowledge are combined to be adopted to identify the hydraulic system.Based on the identified model,PID parameters of the control system are set separately by using PSO algorithm.Some comparative research are studied by using three different fitness functions,such as IAE,ISE and ITSE.The results showed that the similarity between identified hydraulic system and the practical system is up to 96%;By comparison,the system using the PID parameters which were obtained by PSO based on ITSE has a faster response,better stability and higher accuracy.