Initial Experimental Results with Unthrottled Load Control Using a Mechanical Fully Variable Valve Lift System for High-Speed Operation 2004-01-1394
The ‘UniValve’ fully variable mechanical valve lift system is rated for use at engine speeds up to 8500 rpm. This system varies the valve opening period together with the amount of valve lift. When the engine is idling and valve lift is approximately 0.3 mm, the opening period is about 90 degrees of crankshaft rotation; at the full valve lift of 9 mm, the valve remains open for 320 degrees of crankshaft rotation. Valve lift is adjusted by means of an extremely rigid eccentric shaft rotating in bearings in the cylinder head. The system has been applied to a single-cylinder engine. The valve gear's dynamic behavior at engine speeds up to 8500 rpm the first results are described here, together with the fuel-consumption and torque benefits and the system's influence on emissions. The effects of the new load control system on mixture formation and the resulting nvh of the single-cylinder engine, particularly at low running speeds and loads, are also examined.
Citation: Flierl, R., Kairies, D., Hannibal, W., and Knecht, A., "Initial Experimental Results with Unthrottled Load Control Using a Mechanical Fully Variable Valve Lift System for High-Speed Operation," SAE Technical Paper 2004-01-1394, 2004, https://doi.org/10.4271/2004-01-1394. Download Citation
Rudolf Flierl, Dirk Kairies, Wilhelm Hannibal, Andreas Knecht
University of Kaiserlautern, University of Applied Sciences, Iserlohn, Hilite International
SAE 2004 World Congress & Exhibition
Variable Valve Actuation 2004-SP-1829, SAE 2004 Transactions Journal of Engines-V113-3