Vehicle calibration optimization using a dynamic test bed with real time vehicle simulation

摘要

Nowadays, most engine calibration tests are carried out on a chassis dynamometer. For the initial calibration phase, these tests require extensive resources, such as complete prototype vehicles and associated test beds, while the phase itself focuses only on the powertrain. In order to lower the overall cost of engine development, D2T offers test bed solutions designed to reduce the number of chassis dynamometer tests thanks to real time simulation models included in the MORPHEE 2 automation system. Using a conventional dynamic test bed application (powertrain with no clutch and a simplified gearbox), D2T models simulate driver behaviour and actuation of the clutch, gearbox and final drive without the drawbacks and running costs of a chassis dynamometer. Indeed, it is easier to modify mechanical specifications chosen to run for the models and then to test other solutions by simulation. Moreover, the initial development phase (optimum settings on cycle, optimization of pollution settings in transient states, validation of DPF or NO_xTrap supervisor, etc.) can be carried out in first on a dynamic engine test bed in order to reduce the number of tests on the chassis dynamometer. This presentation aims to describe this new approach using a comparative study between rolling tests on a chassis dynamometer and the same tests simulated on an engine test bed. The most restrictive tests being exhaust emissions standards approvals, the quality of the results will be evaluated using a comparison of pollutant emissions.