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Improving Spark Ignition Engine by Low-Pass Filter of Sliding Mode Control with Adaptive PID Tuning

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A first order low-pass filter in sliding mode control with adaptive PID tuning controller is proposed to improve the performance of a spark ignition combustion engine through an optimal air/fuel ratio. To accomplish the concept, the engine speed can be controlled by an advanced ETC technique. Simulation and experimental results show that the proposed controller has speed response comparable to other different control techniques such as it can control the speed close to a desired value very fast, has tiny oscillation, and no overshoot of the rise time while maintaining the system robustness. The goal of engine speed control in this is low fuel consumption and low emission while not being interested in the influence of the use of different fuel types. By taking experimental data 120 sec after the warming up period (40 sec based on the ECE/EEC emission procedure tests), the proposed controller can give the lowest emission of CO and fuel consumption rate of the different controllers. As a result, CO emission by the use of E10 and Gasoline octane-91 is 1063.50 ppm and 1,123.50 ppm, respectively. For the fuel consumption rate, the E10 is consumed at 0.06922 l/min while Gasoline octane-91 is consumed at 0.06811 l/min. In addition, the HC emission is restricted to be small by using the PID controller. The HC value is 162.20 ppm for E10 and 124.17 ppm for Gasoline octane-91. This is because most HC emission explodes at the beginning and reduces to a small value during the rest time. This explosion corresponds to the rise time of the PID. In addition, the fuel consumption by using the Gasoline octane-91 is lower than the use of E10 for all controllers. This comes from the higher heating value of the Gasoline octane-91.
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Document Type: Research Article

Publication date: November 1, 2013

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