Abstract— The paper presents an application of a recently developed Fuzzy logic controller for time-delay systems to the idle speed control (ISC) problem in spark ignition (SI) internal combustion (IC) engines.
Automobiles spark ignition engines spend a large percentage of their time operating in the idle speed region. The engine idle speed control system design is a difficult problem because are inherently nonlinear, incorporating variable time delays characteristics exists everywhere between the input and output of an engine. The output time delay which varies inversely with the engine speed makes the control process even harder. Furthermore, disturbances caused by different operating conditions may arise during engine idle speed running. All these reasons have increased difficulties to control the idle speed accurately.
Engines are inherently nonlinear, incorporating variable time delays and discontinuities which make modeling difficult, and for this reason their control is well suited to optimization using Fuzzy logic algorithms. This paper aims to apply Fuzzy logical controller to maintain a constant idle speed, in this experiment, a SAAB B202 engine was used to identify idle speed appearance. The developed model has a control-design oriented philosophy and is capable to significantly minimize the varying of idle speed within an engine speed.
Keywords— idle speed control, spark ignition, inherently nonlinear, time delay, fuzzy logical control.
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