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CH AP TER 7 .1 Hybrid vehicle design
Fig. 7.1-3 Map-controlled drive management: (a) BMW parallel hybrid drive; (b) parallel hybrid-drive mechanism; (c) vehicle specification;
(d) ragone diagram for the two battery systems; (e) vehicle management; (f) optimized recharge strategy.
reduction by epicyclic gear trains, the first down to simple lightweight vehicles using brushed DC motors
4000 rpm, and the final drive gearing providing the and Curtis controllers. Weight can be saved by using
second stage–typically two stages of 3–4:1 are involved. a motor of one-quarter the normal torque capacity and
A change-speed gearbox only becomes necessary in multiplying up the torque via the gearbox.
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