The S Hybrid uses a parallel mild hybrid system with a small 15 kW e-motor connected to the crankshaft between the motor and transmission, along with a Lithium-ion battery pack for energy storage, power electronics and a complement of electrified auximilary systems.
Combined torque curve for the S hybrid.
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The high torque of the e-motor at low speeds offsets the reduction in low-end torque resulting from applying the Atkinson cycle to the combustion engine. Moving to a more powerful e-motor increased the weight of the hybrid system and decreased the fuel consumption.
Furthermore, at a higher electrical to combustion power ratio, the e-motor operates increasingly in less favorable areas of the performance map as maximum requirements increase. The power electronics—from Continental—comprise a control unit which acts as the master of the E-drive system and a power unit that converts the direct current generated by the battery.
The power electronics can cope with continuous currents of A, and short-term as high as A. Power is supplied to the e-motor by a bus bar. The power electronics are situated in the engine compartment in the location of the conventional starter motor and are cooled by a separate circuit.
The S hybrid battery pack. Lithium-ion battery pack.
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The battery is connected to the vehicle air conditioning circuit so it can be cooled independent from the engine. Cut-off valves are integrated into the system that allows the customer to switchoff the air conditioning without interrupting battery cooling.
When providing support for load-point shifting, the operating strategy only allows shallow discharge cycle of the Li-ion battery to maintain the cycle strength. This contributes to the year expected service life.
Last week Business Insider launched an exclusive sneak peek at the Mercedes-Benz S HYBRID Sedan. One of the features we're totally. Mercedes-Benz S Hybrid Review: Comprehensive Because it's a 'mild' hybrid, the Benz doesn't drive on the battery power. eBay. . !