Torque Sensor based Powertrain Control
The transmission is probably the drivetrain component
with the greatest impact on driveability of an automatic
transmission equipped vehicle. Since the driver only has an
indirect influence on the gear shift timing, except for situations
like kick-down accelerations, it is desirable to improve shift
quality as perceived by the driver. However, improving shift
quality is a problem normally diametrically opposed to minimizing
transmission clutch energy dissipation. The latter has a great
impact on transmission lifetime, and has to be defined and taken
into consideration along with the notion of shift quality. The
main focus of this thesis is the modeling of a drivetrain of an
automatic transmission vehicle, and the implementation in
MatLab/Simulink, including the first to second gear upshift. The
resulting plant based on the derived equations is validated using
data from a test vehicle equipped with a torque sensor located at
the transmission output shaft. The shaft torque is more or less
proportional to the driveline jerk, and hence of great interest
for control purposes. Control strategies are discussed and a PID
controller structure is developed to control the first to second
gear upshift, as opposed to the traditional open-loop upshift
control. Furthermore, the proposed controller structure uses the
transmission output torque and the differential speed of the
engaging clutch as inputs, to control the clutch pressure and the
engine output torque, respectively. The structure is
unsophisticated and transparent compared to other approaches, but
shows great theoretical results in terms of improved shift quality
and decreased clutch wear.
Fredrik Marciszko
2004
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