> Great emphasis was placed on modular design, to ensure that the diesel-hybrid system could be fitted into as many models of the Hyundai Group as possible. 1 9 F O C U S Photos: Hyundai Motor Group, AVL mance classes to have an additional compressor – the mild hybrid drive can be implemented with the BSG alone. Besides offering increased starting convenience and changeof mind functionalities, the 48-volt BSG is capable of maximizing regenerative energy capture. Both the electric supercharger and the BSG were contributed by Valeo. The 48V lead-carbon battery modules are manufactured by East Penn, a member of the ALABC Consortium. JOINT DEVELOPMENT OF AVL AND THE TECHNICAL CENTER OF THE HYUNDAI MOTOR GROUP IN GERMANY The activities covered by AVL in the development of the T-Hybrid drivetrain are summarized by project leader Carsten Kaup, AVL Schrick, Germany: “Our main task was system design – we simulated and defined the powertrain architecture and that allowed us to calculate fuel consumption and performance To address customer demands, the system also features the option to drive short distances in electriconly mode. “In this application,” Michael Weißbäck continues, “the BSG has to assist in driving the non-fired combustion engine, so the function is naturally not ideal from an energy point of view. But for customers, the opportunity to park fully electrically or drive electrically in urban stop-and-go traffic situations is very attractive – that’s why we want to enable limited pure electric driving as a convenience feature.” In its development, great emphasis was placed on modular design, to ensure that the diesel- hybrid system could be fitted into as many models of the Hyundai Group as possible. For example, the position in which the BSG is installed is exactly where the conventional alternator used to be; it only needs to be replaced. 48-VOLT ELECTRIC COMPONENTS The T-Hybrid’s electric compressor is designed as an independent compressor that is installed upstream of the gas-driven turbocharger, ensuring full separation of engine operation and electric supercharging. As the electric compressor permits immediate boost pressure build-up, it becomes possible to bridge the extended transient turbo lag, produced by the bigger turbocharger. As soon as sufficient exhaust gas is available for the turbocharger, the electric compressor is switched to bypass mode. Due to the system’s modular design, it is not even necessary for vehicles in lower perfor
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