Schaeffler Presents Innovations for Entry-Level Hybridization with 48 Volts
Resource from: Schaeffler Technologies GmbH & Co. KG Likes:285
Jan 20,2014
Smart Hybridization with a 48 V Low-Voltage System
Schaeffler has a wide range of ideas for future vehicles equipped with a high-performance 48-volt on-board electric system, and these are bundled together in the company’s transparent vehicle trade show exhibit with technical solutions for 48-volt electrification on display at the North American International Auto Show (NAIAS) in Detroit, USA. This approach represents a smart and cost-effective solution for achieving specified fuel consumption and emissions targets in the future, such as those laid out for the year 2025 by the CAFE standard.
The central element is a compact 48-volt electric drive module that includes a clutch and planetary transmission, and can be placed either on the front or rear axle. This drive module paves the way for economical hybridization. The low-voltage design of the solution reduces the costs and outlay compared to high-voltage solutions with their associated requirements. This hybridization allows significant advances to be made in terms of drive efficiency, as the 48-volt electric system opens up operational possibilities that were previously the exclusive domain of vehicles with high-voltage hybrid components. Even with a 48-volt system, a significant level of energy recuperation can be achieved, i.e. a high proportion of the energy released when the vehicle decelerates can be recovered and fed back into the battery. This recovered energy can be used for the supplementary electric drive, which in turn directly reduces the vehicle’s fuel consumption. In addition to energy recovery, the generator with an output of up to 12 kW can also be used to drive the vehicle. This provides options including so-called “crawling” – electrically powered driving in dense inner-city traffic, as well as moving off, driving at low speeds, and parking using electric power. Electric “boosting” during starting and so-called electric sailing – a driving mode in which the electric motor ensures constant speed while the internal combustion engine is switched off – make a positive contribution in terms of fuel consumption and emissions, however.
“Using a 48-volt solution makes it possible to achieve outputs of up to 12 kilowatts,” summarizes Schaeffler CTO Prof. Peter Gutzmer. “This entry-level form of hybridization already offers the essential advantages of a hybrid vehicle and, at the same time, is an economically attractive, low-cost option that allows CO2 emissions to be reduced by up to 15 percent.”
The electric drive, which has an output of up to 12 kilowatts, acts as the hybrid vehicle’s sole source of power when “crawling”, i.e. in stop-and-go traffic. The electrically generated propulsion of Schaeffler‘s 48-volt drive module is also sufficient for driving in residential areas, parking garages, and other low-speed driving situations. This is also true of the comfortable driving mode known as “sailing”, in which the electric motor ensures virtually constant speed across a wide operating range while the internal combustion engine is switched off. The electric drive assists the internal combustion engine by providing additional torque, e.g. when moving off from the traffic lights – a function referred to as “boosting”. The high performance of the 48-volt system also means that the drive element opens up new potential for energy recovery. Due to the higher recovery capability, the kinetic energy released during deceleration is now no longer converted into heat that subsequently dissipates, but is instead fed back into the on-board electric system in the form of electrical energy. The choice of two gear stages for the Schaeffler drive also provides further benefits when it comes to regenerative braking.
“The fact that the drive unit is connected directly to the propshaft in vehicles with rear-wheel drive means that drag losses by the internal combustion engine are prevented. We can thus achieve maximum efficiency and make driving situations possible that were previously only offered by hybrid vehicles with significantly more complex designs,” explains Dr. Tomas Smetana, vicepPresident Product Group Electric Axle Systems at Schaeffler. “Our combination of an electric motor and transmission also allows the flow of force to be distributed selectively, drive torques can be superimposed, and even torque vectoring – the variable distribution of torque that serves to increase driving safety – is possible.”
The compact design of the cylindrical drive module means that it can easily be integrated into the powertrain, so it can be integrated into the architecture of the vehicle without having to reduce the volume of the trunk or the fuel tank.
Automobile manufacturers who decide to install a second low-voltage on-board electric system (48 volts in addition to the standard 12-volt system) can also integrate other suitable innovations into the vehicle. These include high-performance, rapid-reaction actuators for the chassis that allow the ground clearance to be regulated according to the situation during driving, which has a positive affect on the vehicle’s aerodynamics and thus on its fuel consumption. In addition to the high performance due to the higher voltage range, the second on-board electric system also offers the advantage of smaller cable cross-sections. This saves weight and facilitates the integration and installation of the wire harnesses in the vehicle.
A range of other functions that push today’s standard 12-volt systems to the limit of their performance can be practically integrated into the architecture of a 48-volt system. These range from mechanical tensioning elements for 48-volt belt-driven starter generators and a number of electromechanical adjusting elements for the clutch, steering, roll stabilization and self-leveling suspension through to hybrid modules, axle drive solutions, and electromechanical torque vectoring units.
“We have combined a large number of conceivable products together in this trade show exhibit,” explains Gutzmer. “Our aim is to show the wide range of possible solutions and demonstrate Schaeffler’s system-based approach.”
(Schaeffler Technologies GmbH & Co. KG)
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1.The news above mentioned with detailed source are from internet.We are trying our best to assure they are accurate ,timely and safe so as to let bearing users and sellers read more related info.However, it doesn't mean we agree with any point of view referred in above contents and we are not responsible for the authenticity. If you want to publish the news,please note the source and you will be legally responsible for the news published.
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