Nowadays vehicle manufacturers are characterized by criteria like comfort and driveability behavior, individualization of optional equipment or fleet energy efficiency. Especially comfort and driveability depend on the subjective impression of every individual driver. On the other hand a modern development process requires objective indicators for every development target to provide a high efficiency. A well-known and well-proved tool for the objective assessment of driveability and driving comfort is the analysis- and benchmark-system AVL-DRIVE. This tool fully automatically detects and rates driving maneuvers during a test run - online and in real-time. The associated benchmark guidance provides a listing of driver instructions respectively suitable test maneuvers for an adequate and significant driveability benchmark of a test vehicle. The evaluation of the analysis results and the assignment to possible malfunction causes or improvement capabilities are presently carried out manually by the development engineer. Furthermore, the driver only gains a limited online-feedback about the "quality" of the driven maneuvers. The term "maneuver quality" means in the current context, how adequate the maneuver is driven by the real driver, for instance the accelerator-pedal progress during a load-change maneuver like the "Tip- In". This "maneuver quality" is considered and rated in AVL-DRIVE besides the driveability rating, but yet without a direct feedback depiction. The first part of this paper introduces an approach for an automated evaluation of driving maneuvers on the example of a positive load change maneuver (Tip-In). For this purpose, the existing interface DOMI (DRIVE Open MATLAB Interface) of AVL-DRIVE is used for the implementation of online routines for a "maneuver quality"-rating with direct feedback to the driver. This approach allows a considerably increase of "maneuver quality" and therefore of development efficiency. In the second part the frontloading of comfort and driveability development to earlier stages in the product development process is specified. This is done by conducting reverse engineering (according to the proposal "from road to office"). Proper driven maneuvers from in-vehicle testing are transferred to other test environments, e.g. roller test benches or pure simulation. This approach guarantees on one hand realistic test maneuvers and allows on the other hand a simplified comparison of driveability benchmark results between different test environments. A particular attention is set here to the application of the pure math Vehicle Simulation Model (VSM) from AVL. VSM is a map-based and real-time capable simulation model which concentrates on driveability relevant effects.
Automation of driveability researches in different test-environments using the example of a positive load change-maneuver ("Tip-In")
2010
15 Seiten, 8 Bilder, 11 Quellen
Aufsatz (Konferenz)
Englisch
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