Engine idle speed control using actuator saturation

Presented in this paper is the design and experimental validation of a satu rating engine idle speed controller for a Ford V-8 fuel injected engine. Th e nonmeasurable external torque disturbance perturbing engine speed is deli vered from the power steering pump. The performance specification is an all owable engine speed tolerance of 140 r/min about a desired set speed of 600 r/min. The controlled input is a voltage to the bypass air valve (BPAV) wh ich regulates the air ingested into the engine. The BPAV voltage available for engine speed regulation is bounded by 0.8 V. A frequency domain control ler design methodology is used to design the controller. The performance ob jective is satisfied using saturation control during large engine speed tra nsients. During steady-state operation, the controlled input is not saturat ed.