Simulation On Electronic Throttle ANFIS Control For Idling

Electronic throttle control technology solved the problems that mechanical throttle control couldn't do. Because of mechanical throttle's restrictions on the dynamic characteristics, it was very difficult to make accurate timely adjustment under different conditions of the vehicle .The throttle degree was adjusted by control algorithm, which controlled the air rate precisely to obtain the best engine air-fuel ratio, with a result of achieving the engine optimal performance, enhancing vehicle dynamic and economic performance and reducing the discharge of harmful substances. In this dissertation, the stability control simulation of engine idle speed was studied on the basis of electronic throttle control with the characteristics of idle condition.Electronic throttle of Bosch abolishing the traditional idle bypass valve was adopted in this dissertation, which controlled idle air to flow through the opening of throttle. For achieving the opening of the throttle control, the Intel's 16-bit SCM 80C196KB main chip was used to develop electronic throttle control system hardware circuit on the condition of engine idling, and H-bridge LMD18200 chip was used to achieve reversible control of the DC motor.Based on the characteristics of uncertainty, nonlinear and time variability of the engine idling, an adaptive network fuzzy inference system (ANFIS) was proposed in this dissertation, which combined the fuzzy reasoning and neural network adaptive modeling. The idle speed system was controlled effectively by the ANFIS based on the T-S model. In virtue of the neural network's information storage capacity and the ability of self-learning, ANFIS initialized automatically the fuzzy rules and adjusted adaptively premise and conclusion parameters through the structure identification and parameter identification of the system. As the result, the control rules, membership function and output function was optimized.The simulation model of electronic throttle controller and engine was built with the tool of Matlab/Simulink. The validity of the electronic throttle control algorithm was tested on the hardware-in-the-loop simulation system based on Matlab/xPC Target. The real-time simulation results showed that idle speed control strategy based on ANFIS was feasible and effective of the idle speed control stability which had better stability and dynamical performance, accordingly meeting the stability requirements of engine idle speed control; Hardware-in-the-loop simulation system based on xPC Target provided a friendly experiment environment for designing and testing of idle speed controller, and the development period was shortened.