Optimal cam design and system control for an electromechanical engine valve drive

An electromechanical valve drive system using a cam-based mechanical transformer has been proposed to achieve variable valve timing in internal combustion engines. This technique promises substantial improvements in fuel economy and emissions. However, there are several challenges to transform this concept into an attractive commercial product, especially achieving acceptable power consumption and actuator size. In this paper, significant reduction in power consumption, torque requirement, and transition time are achieved. These improvements are based on an effective nonlinear system model, optimized design of the cam — a key system component — and exploration of different control strategies to maximize performance.

[1]  Yihui Qiu,et al.  Advanced modeling ,control, and design of an electromechanical engine value drive system with a limited-angle actuator , 2009 .

[2]  D.J. Perreault,et al.  Design and experimental evaluation of an electromechanical engine valve drive , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[3]  Ingo Lenz,et al.  A Fully Continuous Variable Cam Timing Concept for Intake and Exhaust Phasing , 1998 .

[4]  V. Picron,et al.  Electro-Magnetic Valve Actuation System: First Steps toward Mass Production , 2008 .

[5]  G. B. Parvate-Patil,et al.  An Assessment of Intake and Exhaust Philosophies for Variable Valve Timing , 2003 .

[6]  Eric Rask,et al.  Two-Step Variable Valve Actuation for Fuel Economy, Emissions, and Performance , 2003 .

[7]  Martin Pischinger,et al.  Benefits of the Electromechanical Valve Train in Vehicle Operation , 2000 .

[8]  Michael Levin,et al.  Increasing Torque Output from a Turbodiesel with Camless Valvetrain , 2002 .

[9]  Woo Sok Chang,et al.  An electromechanical valve drive incorporating a nonlinear mechanical transformer , 2003 .

[10]  Thomas Dresner,et al.  A Review of Variable Valve Timing Benefits and Modes of Operation , 1989 .

[11]  Yan Wang,et al.  Nonlinear Self-Tuning Control for Soft Landing of an Electromechanical Valve Actuator , 2002 .

[12]  R. Flierl,et al.  The Third Generation of Valvetrains - New Fully Variable Valvetrains for Throttle-Free Load Control , 2000 .

[13]  T. Ahmad,et al.  A Survey of Variable-Valve-Actuation Technology , 1989 .