SAE 2013 Energy Savings and Emission Reduction Forum
Technical Session Schedule
Thursday, November 7
Technical Session: Variable Valve Trains
(Session Code: ESER4)
Room Site N5 Room M47 10:30
This session will focus on the continued development of VVA will become necessary on virtually all gasoline engines, and must be adopted on diesel engines. The benefits achieved with the applications of this technology include: fuel economy, reduced emissions, improved power, performance, reliability and durability.
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|Electromagnetic Variable Valve Actuation – A Comparison of Three Potential Solutions
In recent years, much focus has been put into electromagnetic variable valve actuation since it can provide the cycle-by-cycle flexible valve timing needed for throttle less engine control or high efficiency combustion modes such as Homogeneous Charge Compression Ignition. Unfortunately, there are significant engineering challenges that need to be overcome when designing such a system. Valve accelerations are typically orders of magnitude higher than would be required for typical industrial servo systems, valve seating needs to be very quiet, and energy consumption needs to be similar to a conventional mechanical valve drive. The author discusses his extensive experience with three different valve actuation systems. First, a widely studied solution originally envisioned by FEV is presented that uses a solenoid controlled mass spring system. Then, a cam controlled mass spring system that is based
on patents from Siemens, BMW, and MIT is presented. This second system has the potential to greatly reduce the control complexity compared to the solenoid system. Finally, a direct drive system is presented that aims to further reduce system complexity while providing greater valve motion flexibility. The presentation concludes with a side by side comparison of the three systems that is based on actuator test-benches and engine experiments.
Rudolf Seethaler, University of British Columbia Okangan
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|Progress in Camless Variable Valve Actuation with Two-Spring Pendulum and Electrohydraulic Latching
Zheng David Lou, Jiangsu Gongda Power Technologies Co.