The increasing complexity of control system requirements has led to the use of microprocessor based controllers on gas turbine systems. For this automotive turbine system, precise temperature controlled accelerations and modulating clutch spools demanded complex schedules and tight control of system non-linear behavior. The control system also monitors turbine performance and START/STOP requirements.
The control system hardware consists of a single string controller, fitted with auxiliary overspeed and temperature monitors. Eight proportional integral derivative (P ID) loops are run concurrently to control the fuel and clutch valves, as well as the schedules, logic and monitoring functions. The control functions are scheduled to run every 20 to 160 milliseconds, as a function of their bandwidth requirements.
System diagnostics are also provided, allowing rapid service of the system when shutdowns occur.