hybridization > The e-axle system engineered by AVL California Technical Center for the customer Linamar Corporation on the testbed. AVL E-AXLE HYBRIDIZATION SYSTEM The electrically driven rear axle, developed by AVL, is a highly efficient approach to vehicle hybridization. The system’s flexible architecture allows OEMs to adapt the solution to their exact needs in terms of performance, choice of components, suppliers or even required functions. Hybridization based on an electrically driven rear axle offers some major advantages: OEMs are able to meet customer demands for hybrid models that deliver good performance while maintaining great fuel economy. From the car manufacturer’s point of view, the front vehicle design can remain largely unchanged – all that needs to be done is to accommodate the electrical components needed for hybridization (belt-driven starter generator, control unit, etc.) into the engine compartment. This also makes the electrically driven rear axle an efficient solution for integrating a hybrid drive into a vehicle already in serial 2 4 F O C U S production. A further advantage of the electrically driven rear axle is that an all-wheel drive can be implemented without the previously required components – power take off, differential transmission, cardan shaft and rear-axle differential. SYSTEM SET-UP The e-axle hybrid system, developed by AVL, consists of the e-drive module integrated into a sub-frame similar to a conventional differential implementation. The e-axle contains either one or two electric motors, a disconnect clutch and the actuators. A belt-driven starter generator mounted to the engine allows for recuperation, supplying energy to the electric motor and charging the battery that has a capacity of 8 to 12 kWh. The technology is designed to operate at supply voltages from 330 to 660 Volts. The advanced variant of the AVL e-axle with two electric motors enables torque splitting, which optimizes the vehicle’s driving dynamics behavior during cornering. Moreover, drivers can choose between different driving modes – ranging from very economical operation (“eco-drive”) or a decidedly sporty driving style to all-electric driving. The plug-in hybrid system’s electric only range covers 50 kilometers.
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