– New hybrid system on 48-volt base can be easily integrated in conventionally powered vehicles – and allows purely electric driving functions such as “Sailing”, which had been only to offer the more complex high-voltage hybrid systems
– The Vox Magazine “automobile” determined now testing a demonstration vehicle with a predominantly urban conditions 21 percent fuel savings
– The Continental system goes from 2016 in European automotive manufacturers in series
– Worldwide market share of 48- volt vehicles is expected to grow by 2025 to over 10 percent
– New video of Continental clearly explains the functions of the “48 Volt Eco Drive”
When it comes to the reduction of fuel consumption and emissions, plays Besides optimizing combustion engines, the electrification of the powertrain a central role – ranging from the fuel-saving start-stop function up to the electric drive. In this spectrum, the electrification options but so far there is a gap between the relatively inexpensive 12-volt start-stop systems and the much more complex hybrid solutions with voltages from 110 volts. This gap has the international automotive supplier Continental closed with his “48 Volt Eco Drive” system
The new hybrid technology combines the best of both worlds. You can be with little effort in the architecture conventionally powered vehicles integrate and also offers features that were previously only found in the high-voltage hybrid systems – switching off the engine while driving (“Sailing”, “Coasting”), a very fast, comfortable premium engine start and efficient brake energy recovery ( recuperation). The new Continental technology will first go 2016 European automobile manufacturers in series. Which fuel-saving potential it offers, now is the magazine “automobile” of the TV channel Vox on 16 November by 17 clock . The Vox editors tested the demonstration vehicle from Continental – a commercially available compact cars with 1.2-liter petrol engine, supplemented by the “48 Volt Eco Drive” system – under real conditions in predominantly urban areas
The. Result: 21 percent fuel saving over the standard version with 12 volt start-stop system. “This result impressively demonstrates the enormous potential offered by our 48-volt hybrid system in the reduction of fuel consumption and emissions,” Dr. Carsten Goette, director says development board power supply stabilization system of the division Hybrid Electric Vehicle Continental’s Powertrain Division. “The greatest savings can be in urban areas achieve, but also on country roads and motorways reduces the system by stopping motor and recuperation consumption. The average consumption according to the New European Driving Cycle (NEDC) is about 13 percent lower than for a conventional According to our measurements combustion system without start-stop function. “
Particularly strong demand in compact and midsize expected
Continental offers systems for all levels of driving electrification of the 12 volt start-stop technology to the entire drive train for electric vehicles. In this strategy the “electrification to measure” is the new 48-volt hybrid system another component. “This new technology is very economical because they can be easily integrated to one in an existing vehicle architecture and, secondly, the battery costs due to the relatively small 48-volt batteries are manageable,” says Christopher Breitsameter, Head of Business Development & amp; Strategy of Powertrain Division. “The automotive manufacturers require cost ‘Clean Power’ solutions with an attractive system price in the low double-digit euro range per gram CO² reduction – with the ’48 Volt Eco Drive ‘we are exactly in that order.” The system is optimal in all vehicle classes used, so Breitsameter. “We expect that it will be particularly in demand in the high-volume segments of compact and mid, since the cost hurdle for electrification of the drive train is very high.” In view of the forthcoming reduction in fleet emissions to an average of 95 grams of CO² per kilometer Europe will likely take the lead in the introduction of the 48-volt technology. “We expect that other regions will follow shortly and the demand is growing worldwide very quickly.” According to industry estimates are in 2025 about 20 percent of new vehicles equipped with electrified drive systems – and more than half of them will be 48-volt hybrid
Low cost, high efficiency -. And basis for New Features
The 48-volt electrical system – which complements the 12-volt power – is the “Eco Drive” system from Continental of three components: an electric motor with integrated frequency converter, the replaced the alternator, an 48-volt lithium-ion battery and a voltage converter (DC / DC converter) for the energy exchange between the two wiring systems. Major interference with the vehicle system are also not necessary, because a 48-volt power requires no action for protection, these are only at voltage levels from 60 volts required. The electric motor is in the current demonstration vehicle from a Continental belt starter-generator with integrated power electronics. The E-machine – which can be alternatively mounted directly to the gearbox – supplies the 48-volt electrical system, support the drive by electric motor (at “E-boosting” and “Sailing”, see below.) And starts the engine very quiet and twice as fast (in less than 0.2 seconds). The 48-volt electrical system provides many advantages in terms of more energy saving and new electrical functions. This allows electric consumers operate with a higher energy requirement at 48 volts efficiently. In addition, 48 volt appliances can be easily constructed due to this high efficiency, which reduces the vehicle weight. And especially for larger vehicles where the conventional 12-volt on-board network already reaches its performance limits, New functions can be – as electric air compressor or electric roll stabilization (active limit the lateral roll in corners) – realized without an additional voltage situation hardly .
Effective recuperation and engine shutdown while driving
Compared to 12-volt systems which offers “48 Volt Eco Drive” significantly more effective recuperation. The so obtained energy that is stored in the powerful Li-Ion battery is of great importance to fuel savings. And the recuperation can be in future applications further optimize eHorizon (electronic horizon), which creates, for example, together with the Continental System on the basis of topographic data and the GPS signal, a three-dimensional profile of the route. The motor control can determine in advance, on the line sections where energy can be recovered and how this energy wird.Den used most sensible fuel consumption reduced the new 48-volt hybrid system by expanding the start-stop function on the driving – total of the internal combustion engine is almost a third of the time off . The 48-volt power bases while the 12-volt on-board network and ensures that all electrical functions are maintained. Conventional 12-volt start-stop systems must, however frequently start for the operation of energy-intensive consumers (eg air conditioning) the engine again or turn it not only in the state from.
“Coasting” “Sailing” and “E-boosting” – clearly demonstrated in the video
The “48 Volt Eco Drive” switches the engine off already, as soon as the driver takes his foot off the accelerator. While at the same time, the drive train is decoupled from the engine, so that the vehicle is rolling freely. In this “coasting” mode, the system changes not only in city traffic, such as when rolling up to a traffic light, but also at higher speeds. “If you overtake at 120 kilometers per hour on the highway and takes his foot off the gas, the energy of the vehicle is sufficient to continue to swim along with the traffic and resume passing maneuver,” says Carsten Gotte. You can see this example in a new video from Continental, sitting in the Gotte at the wheel of the vehicle demonstration and explains its technology. With an average ride the system is about 20 to 25 percent of the time in the “coasting” mode and saves simply by up to 8 percent a fuel. The video also illustrates the two functions of the “48 Volt Eco Drive”, where the belt starter-generator acts as a prime mover. In the “sail” mode – in which the combustion engine is switched off as the “coasting” – holding the electric motor, the speed of the vehicle for a short time constant. And the “E-boosting” supports the electric motor the engine when accelerating, so for example the so-called turbo lag can be compensated.
premium comfort during engine startup
No matter whether the engine is in “Coasting” off, “E-boosting” supports the electric motor in, or the “sailing” to “Coasting” is: From the transitions between the driving modes the driver feels little. The same applies to the start of the combustor after the shut-off, the extremely fast, silent and vibration occurs. Goette: “This premium comfort during engine start is next to the efficiency and cost-effectiveness is another important advantage of our new 48-volt system.”