There is a high level of interest in hybrid transmission designs that combine inputs from an internal combustion engine and one or more electric motors, despite the fact that the high cost premium of current production units cannot be rationally justified by the relatively modest consumption improvements. But there are new transmission designs which can offer significant further improvements in fuel economy and emission reduction, together with vehicle performance benefits, at a cost comparable to a conventional automatic transmission. The field of all vehicle main drive transmissions includes applications from 250 W to 10000 kW, to suit light electric vehicles, mopeds, scooters, motorcycles, cars, trucks, buses, off-highway vehicles and railway. This paper mentions four types of 'Power Combining Technology' (PCT) which will be key enablers for the hybrid operation of such vehicles. The fourth type being the NexxtDrive DualDrive Transmission, the application of which is discussed in more detail. The NexxtDrive DualDrive Single Regime Four Branch Differential is the most versatile of these transmissions as it can be utilised as an automatic transmission in virtually all drive applications and if required, provide the means to hybridise any type of vehicle. The development and cost reduction of suitable electrical machines and controls required for these transmissions is essential here. They generally will be required to be suitable for 4 quadrant operation. Even so, depending on application, all three main types of electrical machine, the PM, the Induction and also the SR type will have their niche here. For packaging and cost reduction reasons the axial flux versions built up from grain orientated steel strip and possibly aluminium windings, instead of copper, should generally be considered for all three types.
Applying the NexxtDrive-DualDrive power combining single regime transmission
2007
17 Seiten, 19 Bilder
Conference paper
English
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