Combined steady state and transient optimization for dynamic smoke reduction on Heavy Duty engine (TIER3 Applications) 2007-24-0055
This paper describes a methodology to investigate the whole set of engine performance requested by off-road vehicles in order to define many sub-ratings with different speed and load ranges:
DoE screening for parameter range evaluation on the whole map
DoE with Map border lines
Boundary conditions to get reliable test results
Raw data plausibility
Modeling based on torque / injected quantity
Optimization (TIER3 calibrations) and Verifications
Development decisions / Map calculations
The method has been tested on real case: NEF 6 cylinder Common Rail aftercooled engine with internal EGR and free floating turbocharger where also the intake manifold temperature is a DoE parameter able to simulate different customer cooler solutions.
Particular attention has been dedicated to the prediction of fuel consumption as well as NOx, HC and smoke emissions. A “zone” approach (a technique to differentiate most likely steady state regions from transient ones) has been implemented to study in deep detail the emissions control speed ranges vs rated power and peak torque.
The Global model was demonstrated to be a powerful tool to define multiple ratings from one DoE plan and to allow subsequent optimisation based on customer engine mission data (datalogged directly from the field) without further testing activity. The correlation to end customer data was remarkably good.
The method is currently under further development to take into consideration transient effects for typical off-highway working cycles.
Citation: Castagna, E., Cottrell, J., Fino, D., and Saracco, G., "Combined steady state and transient optimization for dynamic smoke reduction on Heavy Duty engine (TIER3 Applications)," SAE Technical Paper 2007-24-0055, 2007, https://doi.org/10.4271/2007-24-0055. Download Citation
Edvige Castagna, John Cottrell, Debora Fino, Guido Saracco
FIAT POWERTRAIN TECHNOLOGIES S.p.A., Strada delle cascinette 424/34, 10156, Torino, Italia, Materials Science and Chemical Engineering Department, POLITECNICO di TORINO, C.so Duca degli Abruzzi 24, 10129 Torino, Italy
8th International Conference on Engines for Automobiles