This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Development and Control of Electro-hydraulic Fully Flexible Valve Actuation System for Diesel Combustion Research
Technical Paper
2007-01-4021
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Fully flexible valve actuation (FFVA) system, often referred to as camless valvetrain, employs electronically controlled actuators to drive the intake and/or exhaust valves. This technology enables the engine controller to tailor the valve event according to the engine operating condition in real-time to improve fuel economy, emissions and performance. At GM Research and Development Center, we have developed laboratory electro-hydraulic FFVA systems for single cylinder gasoline engines. The objective of this work is to develop a FFVA system for advanced diesel combustion research. There are three major differences between gasoline and diesel engines in terms of applying the FFVA systems. First, the orientation of the diesel engine valves and the location of the fuel injection system complicate the packaging issue. Second, the clearance between the valves and the piston for diesel engines are extremely small. The single cylinder engine we are working on has less than 1mm clearance when the piston is at top dead center (TDC). Third, different valve profile strategies are required for gasoline and diesel engines. For diesel low temperature combustion, we use late intake valve closing (LIVC) to change the effective compression ratio to reduce the combustion temperature. System hardware includes servo valves, power amplifiers, hydraulic pump and cylinders, sensors and signal conditioners. A robust tracking control was designed and implemented to control the system. The system is capable of generating real-time fully flexible motion for individual intake or exhaust valve and accommodates a large variety of valve profile strategies, such as late intake valve closing (LIVC). Both bench and combustion tests confirm that the system is able to provide the precision and flexibility required for diesel combustion research while operating safely under the small clearance between the valve and piston.
Recommended Content
Technical Paper | Electromagnetic Fully Flexible Valve Actuator |
Technical Paper | The Dual Mode VCS Conrod System – Functional Development and Oil Investigations |
Technical Paper | ‘FM’ - A High Efficiency Combustion System for the Future Light Duty Engine? |
Topic
Citation
Sun, Z. and He, X., "Development and Control of Electro-hydraulic Fully Flexible Valve Actuation System for Diesel Combustion Research," SAE Technical Paper 2007-01-4021, 2007, https://doi.org/10.4271/2007-01-4021.Also In
References
- Inoue, K. Nagakiro, K. Ajiki, Y. Kishi, N. 1989 “A High Power Wide Torque Range Efficient Engine with a Newly Developed Variable Valve Lift and Timing Mechanism” SAE Technical Paper Series 890675
- Moriya, Y. Watanabe, A. Uda, H. Kawamura, H. Yoshioka, M. Adachi, M. 1996 “A newly Developed Intelligent Variable Valve Timing System-Continuosly Controlled Cam Phasing as Applied to a New 3 Liter Inline 6 Engine” SAE Technical Paper Series, 960579
- Oehling, K. H. Teichmann, R. Unger, H. 1996 “Requirements and Potentials of Future Valve Train Concepts” SAE Technical Paper Series, 964211
- Flierl, R Kluting, M 2000 “The Third Generation of ValveTrains-New Fully Variable Valvetrain for Throttle Free Load Control” SAE Technical Paper, 2000-01-1227
- Theobald, M. Lequesne, B. Henry, R. 1994 “Control of Engine Load Via Electromagnetic Valve Actuators” SAE Technical Paper Series, 940816
- Kreuter, P. Heuser, P. Schebitz, M. 1992 “Strategies to Improve SI-Engine Performance by Means of Variable Intake Lift, Timing and Duration” SAE Technical Paper Series, 920449
- Schecter, M. Levin, M. 1996 “Camless Engine” SAE Technical Paper Series, 960581
- Turner, C. Babbitt, G. Balton, C. Raimao, M. Giordano, D. 2004 “Design and Control of a Two-Stage Electro-hydraulic Valve Actuation System” SAE Technical Paper Series, 2004-01-1265
- Allen, J. Law, D. 2002 “Production Electro-hydraulic Variable Valve-Train For a New Generation of I.C. Engines” SAE Technical Paper Series, 2002-01-1109
- Sun, Z. Cleary, D. “Dynamics and Control of an Electro-Hydraulic Fully Flexible Valve Actuation System” Proceedings of the American Control Conference Denver, CO 3119 3124 June 2003
- Sun, Z. Kuo, T. “Electro-Hydraulic Fully Flexible Valve Actuation System for Advanced Combustion Development” Proceedings of the 2006 FISITA World Congress Yokohama, Japan Oct. 2006
- Tsao, T.-C. Tomizuka, M. “Robust Adaptive and Repetitive Digital Tracking Control and Application to a Hydraulic Servo for Noncircular Machining,” ASME Journal of Dynamic Systems, Measurement, and Control 116 24 32 March 1994