This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Influence of Late Intake-Valve Opening on the S.I. Engine-Performance in Idle Condition
Annotation ability available
Sector:
Language:
English
Abstract
This work has been carried out on a two-cylinder s.i. automotive engine and it investigates spark advance, air-fuel ratio and variable valve overlap for low emissions and low fuel consumption, with an acceptable cyclic irregularity under idle conditions. An original application of a variable valve timing system, based on a passive electro-hydraulic link, has been used for this purpose. The instantaneous engine speed and in-cylinder pressure have been measured and recorded by means of an acquisition data system that allows both the determination and the comparison of some cyclic irregularity indexes, under different engine settings, at idle. The optimum spark advance, air-fuel ratio and valve overlap, which yield the best compromise between fuel consumption and cyclic irregularity, under idle operating conditions, have therefore been pointed out.
Recommended Content
Authors
Citation
Badami, M., Marzano, M., and Nuccio, P., "Influence of Late Intake-Valve Opening on the S.I. Engine-Performance in Idle Condition," SAE Technical Paper 960586, 1996, https://doi.org/10.4271/960586.Also In
References
- Washino S. et al. “A Fundamental Study for the Control of Periodic Oscillation of S.I. Engine Revolutions” SAE Technical Paper Series, n. 860411
- Nishimura Yoshihiro Ishii Katsuyuki “Engine Idle Stability Analysis and Control” SAE Technical Paper Series, n. 860415
- Ando H. Motomochi M. “Contribution of Fuel Transport Lag and Statistical Perturbation in Combustion to Oscillation of S.I. Engine Speed at Idle” SAE Technical Paper Series, n. 870545
- Ozdor Nir et al. “Cyclic Variability in Spark Ignition Engines - A Literature Survey” SAE Technical Paper Series, n. 940987
- Stojek D. Stwiorok A. “Valve Timing with Variable Overlap Control” XX FISITA Congress Wien 1984 Paper n. 845026
- Cavallino F. Dicembre 1991
- Cavallino F. 4-5 Novembre 1993
- Bassi A. et al. “CEM - The Alfa Romeo Engine Management System - Design Concept - Trends for the Future” SAE Technical Paper Series, n. 850290
- Yagi Shizuo et alii “A New Variable Valve Engine Applying Shuttle Cam Mechanism” SAE Technical Paper Series, n. 920450
- Passanti F. 1964-65
- Antonelli E. Colasurdo G. ottobre 1974
- Nuccio P. “Variable Valve Timing as a Means to Control Otto Engine Load” XIX FISITA Congress Melbourne 1982 Paper n. 82071
- Nuccio P. Marzano M. Bronuzzi F. “Variable Intake-Valve Closing as a Means to Improve the S.I. Engine Torque-Characteristic” 3rd International Conference on Innovation and Reliability in Automotive Design and Testing Firenze 8 10 April 1992
- Esposito G.C. “Quaderni Pignone” 4 1966
- Geringer B. Wien 24-25 April 1986
- Lenz H.P. Grunden D. “Variable Valve Timing - a Possibility to Control Engine Load without Throttle” SAE Technical Paper Series, n. 880388
- Lenz H.P. et alii “Initial Test Results of an Electro-Hydraulic Variable-Valve Actuation System on a Firing Engine SAE Technical Paper Series, n. 890678
- Geringer B. et alii “Fully Variable Valve Timing - Another Large Step Towards Optimum Spark Ignition Engines” XXIV FISITA Congress London 1992 Paper n. 925103
- Demmelbauer W. et alii “Speed Limits of an Electrohydraulic and a Hydraulic VVA System Constructed for Torque Optimization” International Seminar in High-Performance S.I. Engines for Passenger Cars Milan 5-6 November 1992
- Urata Yasuhiro et alii “A Study of Veihcle Equipped with Non-Throttling S.I. Engine with Early Intake Valve Closing Mechanism” SAE Technical Paper Series, n. 930820
- Mortara W. Canta C. “Engine Stability Sensor” SAE Technical Paper Series, n. 830428
- Connolly F.T. “Direct Estimation of Cyclic Combustion Pressure Variability Using Engine Speed Fluctuations in an Internal Combustion Engine” SAE Technical Paper Series, n. 940143
- Hamming R.W. “Digital Filters” Prentice-Hall, Inc. Englewood Cliffs, New Jersey 1983 Second 111 133