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Abstract |
Gear Shifting by Engine Control
By using engine control during the gear shift, a manual transmission
can be automated without using the clutch during the shift event. It
is then important to minimize the total time needed for a gear shift,
but when doing so driveline resonances may be excited. This in turn
may lead to problems with disengaging the old gear and synchronizing
speeds for engaging the new gear. Internal driveline torque control is a novel idea for handling
resonances and increasing shift quality. By estimating the
transmitted torque and controlling it to zero by engine control, the
gear can systematically be disengaged with minimized driver
disturbances and faster speed synchronization. Field trials show fast shifts to neutral gear, despite disturbances
and driveline oscillations at the start of the gear shift. The
control scheme is simple and robust against variations among different
gears. Furthermore, damping of driveline resonances can be obtained
with an observer in combination with a PID feedback structure, despite
the higher order driveline system.
Magnus Pettersson and Lars Nielsen
IEEE Transactions Control Systems Technology, 2000
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