《Adaptive Control of a Pneumatic Valve Actuator for an Internal Combustion Engine》.pdf

730 IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, VOL. 19, NO. 4, JULY 2011 Adaptive Control of a Pneumatic Valve Actuator for an Internal Combustion Engine Jia Ma, Guoming G. Zhu, and Harold Schock Abstract—Electro-pneumatic valve actuators are used to elim- variable cam phasing with a continuously variable valve lift inate the cam shafts of a traditional internal combustion engine. and duration actuation. They are used to control the opening timing, duration, and lift of A significant amount of research has been conducted to both intake and exhaust valves. In order to develop model-based control strategies, a control oriented model was developed by piece- demonstrate the advantage of variable valve actuation (VVA) wisely linearizing the physics-based nonlinear system model. In over the traditional cam-based valve-train of both gasoline and this paper, an adaptive valve lift control strategy was developed diesel engines. The investigation of intake valve timing control to improve the intake valve lift repeatability. The model reference of a spark ignited (SI) engine was conducted in [4]. It was adaptive system identification technique was employed to estimate found that at low and partial load conditions, engine pumping system parameters needed for generating feedforward control sig- loss was reduced between 20% and 80% due to throttle-less nals for the closed-loop control scheme. The closed-loop lift con- trol strategies, along with the model reference feedforward con- operation. Fuel consumption was improved up to 10% at idle. trol, were developed and implemented in a prototype controller, Th