This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Gasoline Engine Operation with Twin Mechanical Variable Lift (TMVL) Valvetrain Stage 1: SI and CAI Combustion with Port Fuel Injection
Technical Paper
2005-01-0752
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
This paper describes the results of the first stage of an integrated experimental and modelling programme on a gasoline engine with Twin Mechanical Variable Lift (TMVL) capability.
The engine used for this work was a modified version of a 4 cylinder, 2.0 litre BMW engine. The modified engine has the “Valvetronic” continuously variable lift valvetrain on both the inlet and exhaust valves and dual independent cam phasers with 60 crankshaft degrees of phasing authority. The Valvetronic system allows continuous variation of the valve lift from a minimum of 0.25 mm to a maximum of 9.7 mm.
Three operating modes were investigated with port fuel injection:
- Conventional throttling with dual cam phasers - spark ignition combustion
- Inlet valve throttling with dual cam phasers - spark ignition combustion
- Inlet valve throttling with Controlled Auto Ignition (CAI) combustion
For the spark ignition cases, a Design-of-Experiments (DoE) approach using in-house Stochastic Process Modelling (SPM) and optimiser tools was used to optimise the control variables for best fuel economy and to gain an understanding of the trade-offs between economy, emissions and combustion stability. Inlet, exhaust and cylinder pressure data was recorded from all 4 cylinders for combustion and pumping work analysis.
In parallel to the experimental programme, a 1-D gas dynamic simulation was carried out using the Ricardo WAVE code. The model was validated using the measured cylinder, inlet and exhaust system instantaneous pressures. The model was used to derive in-cylinder conditions at the experimental test points.
The paper contains a description of the engine and the test and modelling methods. Part load fuel consumption, emissions and combustion characteristics are compared for the three operating modes investigated. The advantages of valve throttling and CAI combustion are quantified.
Recommended Content
| Technical Paper | Newly Developed Inline 4 AR Series SI Engine |
| Technical Paper | On-Engine Turbocharger Turbine Inlet Flow Characterization |
| Technical Paper | Reduction of Fuel Consumption on Single-cylinder General Purpose Engine |
Authors
Topic
Citation
Stokes, J., Lake, T., Murphy, R., Osborne, R. et al., "Gasoline Engine Operation with Twin Mechanical Variable Lift (TMVL) Valvetrain Stage 1: SI and CAI Combustion with Port Fuel Injection," SAE Technical Paper 2005-01-0752, 2005, https://doi.org/10.4271/2005-01-0752.Also In
References
- http://www.acea.be
- The New BMW 4-cylinder Spark-Ignition Engine with Valvetronic. Part I: Concept and Design Configuration Flierl Rudolf Hofmann Reinhard Landerl Christian Melcher Theo Steyer Helmut MTZ Jun 2001
- The New BMW 4-cylinder Spark-Ignition Engine with Valvetronic. Part 2: Thermodynamics and Functional Features Liebl Johannes Kluting Manfred Poggel Jurgen Missy Stephen MTZ Worldwide Jul Aug 2001
- Evaluation of HCCI for Future Gasoline Powertrains Osborne R. J. Li G. Sapsford S. M. Stokes J. Lake T. H. Heikal M. R. SAE 2003-01-0750
- Phasing strategy for an Engine with Twin Variable Cam Timing Kramer U. Philips P. SAE 2002-01-1101
- Combustion Pressure Based Engine Management System Muller Rainer Hart Martin Truscott Anthony Noble Andrew Krotz Gerhard Eickhoff Martin Cavalloni Claudio Gnielka Marco SAE 2000-01-0928
- The New AVL CSI Engine - HCCI Operation on a Multi Cylinder Gasoline Engine Fuerhapter A. Unger E. Piock W. F. Fraidl G. K. SAE 2004-01-0551