Abstract: An accelerometer unit two-stage temperature control system with multi-operating conditions is described as a two-input two-output nonlinear timevarying uncertain system with bounded disturbance and nonlinear uncertainty. The nonlinear uncertainty comprises system modeling error and the coupling of two interacting control channels. A robust temperature control method based on signal compensation is proposed. A controller designed by this method consists of a nominal controller and a robust compensator. The controller is linear timeinvariant and can be realized easily. Robust control property of the closed-loop system is proven and experimental results show that the designed control system can guarantee high precision robust control of both the interior and exterior temperature of the accelerometer unit under multi-operating conditions.

Key words: control theory and control engineering, temperature control, robust control, accelerometer, multi-operating points