Motorists want to enjoy driving, while the authorities demand low emissions. Although this seems like a conflict of interests, Schaeffler proves that the two objectives can both be achieved. At the VDI Transmission Conference in Friedrichshafen, the mobility solution supplier will be presenting a plug-in hybrid concept based on a CVT (continuously variable transmission).
Plug-in hybrids are a new trend
There is a clear trend towards plug-in hybrids: The combination of an electric drive that can be charged from a power socket with an internal combustion engine is becoming increasingly popular. It therefore goes without saying that Schaeffler also supplies innovative technologies for this application. The combination of a hybrid drive with a CVT is not entirely new but, in the plug-in hybrid variation that Schaeffler is now presenting, it offers even more efficiency and reduced fuel consumption values. What is special about Schaeffler’s solution is the parallel arrangement of the variator and the direct gear stage for the electric drive. “Our concept is particularly compact and, due to its low energy losses, means that a long electric driving range can be achieved”, says Andreas Englisch, President of the Hybrid Drives business unit at Schaeffler. These features are important criteria for automobile manufacturers and drivers because, to put it simply, the further a vehicle can be driven on purely electric energy, the less fuel it consumes and the lower its emissions are.
The enjoyment factor is maintained
The electric motor used in the plug-in hybrid concept provides 80 kW of power, while the turbocharged 1.4-liter internal combustion engine provides a further 110 kW. When installed in this C-segment vehicle, Schaeffler’s plug-in hybrid concept makes it possible to accelerate from 0 to 100 km/h in just 7.8 seconds. And in all-electric mode, it can cover 56 kilometers when combined with an 8.7 kWh battery, while the continuously variable transmission ensures excellent ride comfort. In hybrid mode (combined operation of the internal combustion engine and electric motor), compact vehicles achieve an NEDC consumption of 1.6 l per 100 km – the equivalent of just 39 grams of CO2 per kilometer.
Hybrids’ breakthrough assisted by the high-volume market
Schaeffer has designed this plug-in hybrid concept on the basis of a CVT, i.e. for B and C-segment vehicles. “It is of immense importance that these segments be catered to if the topic of hybrid vehicles is to gain universal acceptance”, explains Dr. Hartmut Faust, Vice President of Research and Development for Transmission Systems at Schaeffler. “Legal regulations governing CO2 emissions are becoming increasingly stringent worldwide, and this means that consumers need to change their way of thinking and accept new solutions.”
The combination of hybrid technologies with a CVT is a promising approach, even though this type of automatic transmission has thus far been more prevalent on the Asian market. Even in Europe, more and more drivers are becoming convinced of the advantages of driving without a clutch pedal. What is more, the era of the gas-guzzling automatic transmission is long gone. Modern automation concepts such as those on offer from Schaeffler provide an efficient service here. Another argument in favor of the CVT is the fact that the gear ratio is continuously adjusted with no interruption to the tractive force, which means that the engine can always be operated in the most favorable area of the datamap.
