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Common-rail mapping on powertrain test bench
Technical Paper
2000-05-0060
Sector:
Language:
English
Abstract
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.
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