Common-rail mapping on powertrain test bench 2000-05-0060

This process contributed to adjust the mapping strategies of the particulate filter implementation for common-rail engines. It also validates different technological solutions that solve inherent difficulties of such depollution system.

Depollution cycle mapping has also been improved by this process which optimizes the ECU mapping in a reproducible way.

Complementary tests realized concern vehicles driveability mapping.

This functionality is simplified with this type of test bench by the opportunity to use different kinds of measurement tools that could be difficult to integrate in a car for dimensions restrictions. This bench takes in account the gearbox clearances in the vehicles driveability mapping during programmed accelerations.

During functionary points change on vehicle, the torque variation leads to a solicitation in the transmissions natural frequency.

Torque variation is piloted by actuators (throttle,...) and torque progressiveness by ECU''s parameters modification.

The good reproducibility of actuators (throttle position,...) and torque analysis during transient phases allows the optimization of torque progressiveness by reproducing accelerations on a given gear by successive approximations.

A process methodology has been realized for each type of process to get quickly adjustment results. A first part is necessary to qualify the robustness of these calculators adjustments.