Browse Publications Technical Papers 2001-01-0241
2001-03-05

Single-Cylinder Engine Tests of a Motor-Driven, Variable-Valve Actuator 2001-01-0241

A novel mechanism concept for a fully flexible, motor-driven, cam-actuated engine valve was reported in [1]. It is capable of i) variable valve timing, ii) variable lift and iii) individual valve phasing control. To check the validity of the concept in real engine environment, engine tests were performed using a single-cylinder of a modified six-cylinder 3.8-liter production engine, with the new motor-driven mechanisms replacing both valves. Firing tests of this engine, with equivalent valve profiles to the production profiles, yielded similar fuel consumption, lower NOx emissions but higher IMEP COV and HC emissions. Motoring tests demonstrated variable timing capability, low cycle-to-cycle valve lift-profile variation as well as low seating velocity and noise. Lessons learned from testing the system in a real engine environment are discussed in details and suggestions for future variable-valve actuation concepts' requirements are offered.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Variable Valve Actuation Mechanisms and the Potential for their Application

890673

View Details

TECHNICAL PAPER

The Case for New Divided-Chamber Diesel Combustion Systems Part Three: Problems with Current DI Engines and Divided-Chamber Solutions for Future Diesel Engines

2001-01-0278

View Details

TECHNICAL PAPER

The Influence of the Valve Stroke Design in Variable Valve Timing Systems on Load Cycle, Mixture Formation and the Combustion Process in Conjunction with Throttle-Free Load Governing

981030

View Details

X