Mercedes-Benz S500 Plug-In Hybrid proves to be faster and more fuel-efficient

Article by Christian A., on July 10, 2014

The 2014 Mercedes-Benz S500 Plug-In Hybrid is an impressive vehicle but it appears that is even more fuel-efficient and faster than the German manufacturer told us last year. According to the recent press release from the German carmaker, the 2014 Mercedes-Benz S500 Plug-In Hybrid accelerates from 0 to 100 km/h in just 5.2 seconds (previous press release said 5.5 seconds), while top speed is electronically limited at 250 km/h or 155 mph.

Moreover, the vehicle has a certified fuel consumption of just 2.8 lires per 100 km (previous press release said 3 l/100 km), emits only 65 g/km of CO2 and can travel 33 km (20 mph) on electric power.

For those who don’t know, the 2014 S500 Plug-In Hybrid is powered by a 3.0-liter V6 petrol engine that generates 328 hp and 480 Nm (354 lb-ft) of torque, paired with an electric motor that develops 107 hp (80 kW) and 340 Nm of torque.

The total output developed by the hybrid system is 435 hp (325 kW) and 650 Nm (479 lb-ft) of torque. What’s more interesting is that the new S500 Plug-In Hybrid can be wirelessly charged thanks to the new inductive charging system developed by Daimler and BMW.

As you may know already, the inductive charging system uses a secondary coil integrated under the tray of the car, while a primary coil is integrated into a floor plate that can be placed on a garage floor for instance.

The electric energy is transmitted contact-free without the need of a cable, at a power rate of 3.6 kW and with a degree of efficiency of 90%.

The Mercedes S500 Plug-In Hybrid is the S-Class’ third hybrid model, following the S 400 Hybrid and S 300 BlueTEC Hybrid. It features a new high-voltage 8.7 kWh lithium-ion battery pack that can recharge through the charging socket located in the right side of the rear bumper.

All of these three hybrid S-Class models -- S500 Plug-In Hybrid, S 400 Hybrid and S 300 BlueTEC Hybrid -- have environmental certificates that document their environmental performance through their entire lifecycle -- from development to recycling. Furthermore, these documents confirm that the performance of these models is certified by independent experts to internationally recognized standards.

In particular, the environmental certificate for the S500 Plug-In Hybrid states that over the entire lifecycle – which covers production, usage of over 300,000 km as well as recycling – this hybrid has clear advantages in terms of carbon dioxide emission performance. It noted that external charging with the European electricity mix could reduce such emissions by around 43 percent or 35 tons, adding that using renewably generated hydroelectricity could cut the emission level by 56 percent or 46 tons.

Meanwhile, the hybrid transmission of the Mercedes S500 Plug-In Hybrid is derived from the 7G-TRONIC PLUS 7-speed automatic gearbox, while the plug-in-hybrid system in the S-Class is based on the carmaker’s parallel hybrid modular system.

Both systems have an extra clutch integrated between the combustion engine and the electric motor. In all-electric mode, the extra clutch decouples the engine, but when this conventional mill is in operation, this feature could move off to offer the performance of a wet start-up clutch. The clutch then substitutes for the torque converter, and interestingly doesn’t need extra space as it is completely integrated in the torque converter housing.

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