Greater dy­nam­ics with­out the weight penalty

Motor (Australia) - - BACK SECTION -

THE eTwin­ster from GKN (right) com­bines im­proved dy­nam­ics with short-range elec­tric power – with­out the weight of a full all-wheel drive or bat­tery-hy­brid sys­tem. It in­volves an elec­tric rear axle with two Twin­ster elec­tro-hy­draulic clutches, as used in the Ford Fo­cus RS. The elec­tric axle can be in­de­pen­dently con­trolled, im­prov­ing cor­ner­ing by torque vec­tor­ing. The sys­tem can also bal­ance the speed dif­fer­en­tial be­tween the axles, im­prove trac­tion un­der slip­pery conditions, drive the ve­hi­cle and re­coup elec­tric power. Mag­no­mat­ics has come up with Magsplit, which is a light, small, sim­ple and more ef­fi­cient way to split the power in a hy­brid driv­e­train. It does away with the fly­wheel’s dual-mass damper, an EM gen­er­a­tor and the gears. They’re re­placed by a mag­netic trans­mis­sion: ro­tat­ing its mag­netic field al­ters a con­tin­u­ously vari­able ra­tio be­tween the elec­tric mo­tor and in­ter­nal com­bus­tion engine, or it can lock them to­gether. Oer­likon Graziano has de­vel­oped a six-speed au­to­matic cou­pled with a 120kW elec­tric mo­tor and fit­ted it in a Mercedes-Benz SLS AMG. Called OGeco, it pro­vides torque in-fill, elec­tric boost, re­gen­er­a­tion, lim­ited elec­tric drive and engine crank­ing, with­out af­fect­ing pack­ag­ing; it takes up the same space as the seven-speed DCT nor­mally fit­ted to the car.

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