By Robert Fischer, Ferit Küçükay, Gunter Jürgens, Rolf Najork, Burkhard Pollak, Gerhard Kokalj, Björn Wultsch, Artur Plötner, Christian Hörsken, Tobias Kassel
This e-book provides crucial info on structures and interactions in car transmission expertise and descriptions the methodologies used to investigate and advance transmission strategies and designs. services of and interactions among parts and subassemblies of transmissions are brought, offering a foundation for designing transmission platforms and for selecting their potentials and homes in vehicle-specific purposes: passenger autos, vehicles, buses, tractors and bikes. With those basics the presentation presents common assets for either cutting-edge and destiny transmission applied sciences, together with structures for electrical and hybrid electrical vehicles.
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Extra resources for The Automotive Transmission Book
This is why increased fuel consumption occurs in spite of the change in transmission. 3 Fuel Economy Optimization 29 Target max Taller (less) gear ratio Sweet point A´ Engine torque Fun to drive Base with defined engine concept and manual transmission A Engine speed Efficiency max Fig. 27 Impact of gear ratio on fun to drive and fuel efficiency Target Engine torque Fun to drive max max* Sweet point A´ A P1 Improvement due to new technology Change due to new gear ratio max* max MT Engine speed Efficiency Fig.
22 Oil temperature dependency of drag torque they will asymptotically approach constant values. The power supplied via the drag torque is completely converted into heat. As soon as heat dissipation (mainly convection) to the environment is in balance with the supplied power loss, the temperature will not be subject to further change, and neither will the drag torque. The heat-up behavior of the transmission has a considerable influence on fuel consumption. The essential manipulated variables in this regard are the oil quantity and the design parameters imposed on vehicle and transmission that influence heat dissipation.
In this case, the transmission ratio is selected slightly larger than in the xmax -case; thus the intersection of supply curve and demand curve is shifted to the descending branch of the supply curve. 41b, dotted line) at all driving velocities. Thus, below the maximum velocity there is stronger acceleration than there is with the xmax-design and sensitivity to power demand increases drops. The disadvantages of this design type are the tendency of higher engine speeds, and as a direct consequence higher fuel consumption, and interior noise levels, if this gear is the highest (the longest, with the smallest transmission ratio).