Abstract
Research and /or Engineering Questions/Objective:
Real time simulation modelling approaches are usually based on mathematical simulation models that need special adjustments in order to investigate and to optimize the capabilities of the vehicle components. The objective of this study is to investigate the common pitfalls that are met during models conversion from offline simulation model to real-time-simulation model.
Methodology:
The indispensable rapid prediction of vehicle behaviour represents a goal to be achieved. This can be completed by using simulation tools. During several vehicle operation stages, there are met different constrains with regard to the chassis and powertrain behaviour. The propulsion systems have to be optimized since the early design process stage. Real time simulation platforms have to be developed in order to satisfy these demands. They have to allow in detail virtually investigation for all the vehicles` components. The target is to test as early as possible the behaviour of the vehicles` systems in the environment they will be used in.
Starting from a model in the loop (MIL) system, a virtual vehicle component is replaced with a physical component. During this transition there are met few inconsistencies.
Some simulation pitfalls are not detectable by the system. Therefore, it is mandatory to investigate the behaviour for each virtual component and to compare it with psychical behaviour and data provided by acquisition systems.
Results:
The predictive results include the possibility of testing virtual models in different environments and for different driving cycles. When physical components come available, they can replace the mathematical sub-models. The main finding has to include the approach of reducing, eliminating, or solving the pitfalls.
Limitations of this study:
An important limitation of the current study is the existence of the physical test bench. Furthermore, the simulated models do not include all the road conditions and the real vehicle environment.
What does the paper offer that is new in the field in comparison to other works of the author: The analysis approach of simulated models in order to identify the common pitfalls while converting a model in the loop into hardware in the loop model is new.
Conclusion:
Errors, bugs and interaction problems of the software can be detected in an early phase of the development cycle. New approaches for detecting pitfalls while converting models in the loop into real time simulation models have been developed. The control systems’ interactions can be studied and adapted during the entire design cycle
KEYWORDS – Simulation; Powertrain; Pitfalls; Real-time-simulation; Modelling