Title :
Nonlinear System Modeling, Optimal Cam Design, and Advanced System Control for an Electromechanical Engine Valve Drive
Author :
Qiu, Yihui ; Perreault, David J. ; Keim, Thomas A. ; Kassakian, John G.
Author_Institution :
Massachusetts Inst. of Technol., Cambridge, MA, USA
Abstract :
A cam-based shear force-actuated electromechanical valve drive system offering variable valve timing in internal combustion engines was previously proposed and demonstrated. To transform this concept into a competitive commercial product, several major challenges need to addressed, including the reduction of power consumption, transition time, and size. As shown in this paper, by using nonlinear system modeling, optimizing cam design, and exploring different control strategies, the power consumption has been reduced from 140 to 49 W (65%), the transition time has been decreased from 3.3 to 2.7 ms (18%), and the actuator torque requirement has been cut from 1.33 to 0.30 N·m (77%).
Keywords :
cams (mechanical); design engineering; drives; electromechanical actuators; friction; internal combustion engines; nonlinear control systems; open loop systems; optimal control; torque control; valves; actuator torque requirement; advanced system control; cam-based shear force-actuated electromechanical valve drive system; electromechanical engine valve drive; internal combustion engines; nonlinear friction model; nonlinear system modeling; open-loop control; optimal cam design; power 140 W to 49 W; power consumption reduction; size reduction; transition time reduction; variable valve timing; Actuators; Electromechanical systems; Friction; Open loop systems; Power demand; Torque; Nonlinear friction model; open-loop control; optimal cam design; variable valve timing (VVT);
Journal_Title :
Mechatronics, IEEE/ASME Transactions on
DOI :
10.1109/TMECH.2011.2159239
