By Robert Fischer, Ferit Küçükay, Gunter Jürgens, Rolf Najork, Burkhard Pollak, Gerhard Kokalj, Björn Wultsch, Artur Plötner, Christian Hörsken, Tobias Kassel
This ebook offers crucial details on structures and interactions in automobile transmission expertise and descriptions the methodologies used to research and strengthen transmission ideas and designs. services of and interactions among elements and subassemblies of transmissions are brought, delivering a foundation for designing transmission structures and for picking their potentials and homes in vehicle-specific functions: passenger vehicles, vans, buses, tractors and bikes. With those basics the presentation presents common assets for either cutting-edge and destiny transmission applied sciences, together with platforms for electrical and hybrid electrical vehicles.
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Extra resources for The Automotive Transmission Book
JICE ω M 2 0 1 2 3 4 5 Slip phase 6 7 Speed n1 Synchronization point n2 0 1 2 1 3 4 2 3 a 5 4 5 6 6 7 Time [s] Maximum clutch torque Torque Maximum engine torque M1 M2 0 1 2 3 4 5 3 4 5 6 7 6 7 Speed n1 n 2 0 b 1 2 1 3 4 2 5 6 Time [s] Fig. , side step8)9 . The value of the clutch torque M2 determines the duration of the slip phase. 37b. At the end of phase 4 the clutch torque M2 exceeds the engine torque M1, before settling at a value constantly adjusted to a value higher than that of the engine torque ( M2 > M1) in phase 5.
7 The effects of shifting operational points are presented in a simplified manner in this chapter. Secondary effects, such as the transmission efficiency levels remain masked. However, it is evident that many improvements can ultimately be attributed to shifting operational point . In comparison with all other optimization possibilities these methods offer the greatest potential to reduce fuel economy, as will be shown below. 3 Optimization of the Internal Combustion Engine Torque Specific fuel consumption The possibilities to improve the efficiency of an ICE are illustrated using the following example.
15). 15) shows the transmitted torque in the case of a slipping clutch. If the introduced torque is greater than the transferable torque the differential speed increases. • For a slipping clutch, the power always flows from the faster turning side to the slower turning side. The power loss is the product of clutch torque and differential speed. Fig. 4 Launch and Synchronizing Speeds 33 Because it is considered to be outflowing, the preceding sign is always negative. 5). lutch Functions in Simplified Power Train Models C The temporal behavior of clutches under ideal conditions is significantly influenced by the applied torques and the connected inertias.