- Category Technical paper
- Edition SIA
- Date 05/21/2014
- Author V. Dolecek, J. Macek, A. Barak, O. Vitek, S. Bogomolov, A. Mikulec - Czech Technical University
- Language English
Type PDF file (1.7 Mo)
(Downloadable immediately on receipt of online payment)
- Number of pages 10
- Code R-2014-02-15
- Fee Free
The current uncertainty in the best solution of future vehicle powertrains calls for the advanced method for the fast assessment of impact of intended innovations.
Thermodynamic parameters of downsized and/or downspeeded engine for very high bmep (up to 35 bar) influence engine mass and overall dimension of engine concept design and configuration and they cannot be estimated by scaling of designs already available.
The thermodynamic substance of the cycle may be simulated without too detailed assumption of the certain partial phenomena realization (e.g., burning pattern), if sensitivity analysis is done before. Simulation methods coupling different level of method depth, as 1-D methods with in-house codes for engine mechanical efficiency assessment and preliminary design of boosting devices (a virtual compressor and a turbine), have been used together with optimization codes based on genetic algorithms. Simultaneously, the impacts of optimum cycle on components dimensions, mass and inertia force loads were estimated since the results were systematically stored and analyzed in Design Assistance System DASY, developed by the authors for purposes of early-stage conceptual design.
Operation fuel consumption has been simulated using updated powertrain and vehicle mass data. NEDC and ARTEMIS tests were applied. The final assessment of downsized engine feasibility has been based on it.