说明：  Abstract—The proportional integral derivative (PID) controller is the most widely used control strategy in industry. The popularity of PID controllers can be attributed partly to their robust performance in a wide range of operating conditions and partly to their functional simplicity. This paper presents design of PID controller using Ziegler-Nichols (ZN) technique for higher order system. A Fuzzy logic controller using simple approach & smaller rule set is proposed. Simulation results are demonstrated. Performance analysis shows the effectiveness of the proposed Fuzzy logic controller as compared to the ZN tuned PID controller & fine tuned PID controller.