Abstract
Manual transmissions contrast with automatic manual transmissions, dual clutch transmission, automatic transmissions and continuously variable transmissions in that these latter are equipped with additional components that allow partial or complete automation of the shift event. This chapter gives a general description of controls and individual aspects are introduced using examples of dual clutch transmissions.
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- 1.
When the gear is engaged, the vehicle speed is calculated using the input shaft speed and the given ratio. Alternative signals, such as the ABS control unit, are delayed by the CAN and are not present fully synchronous.
- 2.
The dither frequency is used as a stimulus to prevent valves from seizing.
- 3.
There might be such signals available from other systems, e.g. air suspension.
- 4.
Some of the latest developments are using a single dog clutch to realize more gear ratios and utilizing the low losses in disengaged state compared to friction locking.
- 5.
During development and calibration, it is an advantage to use torque sensors, and the instrumentation is often placed on the side shafts (output torque).
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© 2015 Springer International Publishing Switzerland
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Fischer, R., Küçükay, F., Jürgens, G., Najork, R., Pollak, B. (2015). Controls. In: The Automotive Transmission Book. Powertrain. Springer, Cham. https://doi.org/10.1007/978-3-319-05263-2_5
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DOI: https://doi.org/10.1007/978-3-319-05263-2_5
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Publisher Name: Springer, Cham
Print ISBN: 978-3-319-05262-5
Online ISBN: 978-3-319-05263-2
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