Transmission-Torque Control for Gear Shifting with Engine Control
By using engine controlled gear shifting, a manual transmission can be
automated without using the clutch during the shift event.
The main contribution of this paper is a novel extension of the
existing system using active handling of driveline resonances. The
strategy is based on a model of the transmission torque, which is
derived by using experimental data from a heavy truck. A key step is
the design of a criterion for a controller that drives the
transmission torque to zero with damped resonances and with a control
signal realizable by the engine.
The proposed solution offers a possibility to optimize the time needed
for a gear shift, which is important since the vehicle is free rolling
when in gear-shift condition. Furthermore, neutral gear can
successfully be engaged also when facing initial driveline
oscillations and load disturbances.
Magnus Pettersson, Lars Nielsen and Lars-Gunnar Hedström
SAE Transactions, Journal of Engines,
1998
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