At the AMG Future of Driving Performance Event we had the opportunity to take a look at AMG’s future drive strategy, which is characterized by a technology transfer from Formula 1.
Also on one Companies focused on driving performance like AMG, the trend towards electrification is not leaving its mark.
With our new drive strategy, we are transporting our typical DNA into an electrified future. Our performance hybrids, developed entirely in Affalterbach, will even surpass the driving dynamics of our current models and thus carry our new technology label E PERFORMANCE absolutely rightly. We as Mercedes-AMG are also continuing to electrify the portfolio with the purely electric derivatives based on the Mercedes-EQ models. We are opening up to new target groups, the Mercedes-AMG as a performance luxury brand of the 21. Century Philipp Schiemer, Chairman of the Management Board of Mercedes-AMG GmbH
For me it is particularly exciting that AMG has taken a significantly different path than most other PHEV hybrid vehicles.
The typical hybrid tries to build a bridge between the combustion engine and the electric drive. The electric motor is often used in hybrid vehicles to support the combustion engine when starting and accelerating. However, all-electric driving has also become a real option in recent years thanks to improved battery technology and greater range.
At AMG, however, the main focus is on performance, which is why the battery was at the forefront of the development all performance in focus instead of mere range.
AMG Perfomance Hybrid first impression
I find the approach chosen by AMG very interesting for two reasons.
The focus on performance is what you expect from AMG, they show how electrification can be used to catapult cars into performance spheres that are otherwise only withheld from hypercars.
In the picture and in the video you can see the e-Performance version of the AMG GT 4-Door Coupe. Even if AMG is still covered when it comes to the exact vehicle data, the system performance value is already calculated e of over 600 kW (815 HP) power and more than 1. 000 Nm torque promised. This makes the sprint from 0 – km / h possible in under 3.0 seconds.
But not only the acceleration and responsiveness are improved, but also the lateral dynamics to improve. The fact that the battery and electric drive are installed on the rear axle results in an optimized weight distribution in the vehicle of almost – 50 between front and rear axle.
Unlike other sporty PHEV models, thanks to the battery, which has been specially optimized for performance, there will always be electricity for the electric motor.
Thanks to the hybrid drive concept, the AMG models will automatically be the more “efficient” vehicles. An AMG model will also have a purely electric driving mode. Due to the comparatively small battery capacity, this mode will not get you very far purely electrically. This begs the question of why AMG chose the plug-in route. The main reason here is probably the fact that you can use the advantages of the PHEV with a socket at home. The car can be air-conditioned, always starts with a fully charged battery and you can start electrically, thus preventing your neighbors from waking up with a loud cold start.
The performance focus also shows that the normal PHEV, which rely on long ranges, but are significantly better than their reputation.
Technical data – AMG Future of Driving Performance
In the video for the article I try to describe AMG’s approach to cutaway models. If you prefer to read the whole thing, there are a few excerpts from the PM from AMG that describe the battery, the drive strategy and also the electric turbocharger.
In the following I have the how I added the most exciting sections for you.
AMG battery with active cooling
Mercedes-AMG starts with the internally named HPB variant 70 with 6.1 kWh capacity, 70 kW continuous output and 150 kW peak power for ten seconds. She weighs 89 kilograms and therefore achieves a power density of 1.7 kW / kg. Conventional batteries without direct cooling of the cells achieve about half of this value.
The innovation boost: the direct cooling of the battery cells
Basis for the high performance of AMG 400 – Volt battery is the innovative direct cooling: For the first time, the 560 cells individually cooled; A high-tech coolant based on an electrically non-conductive liquid flows around them permanently. For the direct cooling, the AMG specialists had to develop new, only millimeter-thin cooling modules. Round 14 liters of coolant circulate with the help of a specially developed high-performance electric pump from top to bottom through the entire battery past each cell and also flow through an oil / water heat exchanger, the attached directly to the battery. This conducts the heat into one of the two low-temperature circuits (LT) of the vehicle and from there to the LT cooler at the front of the car, which finally releases the heat into the ambient air. The system is designed in such a way that even heat distribution in the battery is guaranteed.
For high continuous output and twice the peak output, always in the optimal temperature window
The result: The battery is always in an even, optimal temperature range Working temperature window from 21 degrees Celsius, no matter how often it is charged or discharged. Conventional cooling systems cannot do this, the battery can no longer call up its full capacity. This is not the case with the AMG high-performance battery: Even on fast laps in hybrid mode on the racetrack, where there is frequent acceleration (battery is discharged) and deceleration (battery is being charged), the energy storage unit retains its high performance. On the test bench, prototypes of the battery have already completed countless test kilometers without any problems. Vehicle testing shows a consistently high level of performance and a long service life.
Only effective direct cooling also enables cells with a very high power density to be used. Due to this individual solution, the battery system could be designed to be particularly light and compact. The material-saving busbar concept and the light but stable crash structure of the aluminum housing also contribute to the low weight. It guarantees the highest level of security.
“Always on” operating strategy: electrical power always available
The basic operating strategy is derived from the hybrid power pack of the Mercedes-AMG Petronas Formula 1 racing car. As in the premier class of motorsport, maximum propulsion is always available when the driver needs it – for example to be able to powerfully accelerate out of corners or when overtaking. In addition, the hybrid system is “always on”: With high recuperation performance and needs-based recharging, the electrical power can always be called up and frequently reproduced. The independent battery concept enables the optimal compromise between maximum driving dynamics and contemporary efficiency. All components are perfectly matched to one another: the performance gain can be experienced immediately.
The six AMG DYNAMIC SELECT drive programs “Electric”, “Comfort”, “Sport”, “Sport +”, “RACE” and ” Individual ”are precisely tailored to the new drive technology and thus offer a wide range of driving experiences – from highly efficient to highly dynamic. The drive programs adjust important parameters such as the response behavior of the drive and transmission, the steering characteristics, the suspension damping or the sound. The programs are selected using the rocker switch in the center console or the AMG steering wheel buttons and visualized in the instrument cluster and on the multimedia display.
Electric exhaust gas turbocharger
The Next technological level: AMG performance hybrids in combination with the AMG four-cylinder turbo engine. The 2.0-liter engine with the internal designation M 139 has so far been used horizontally in the compact performance models. As an E PERFORMANCE variant, it will also ensure propulsion in line with class in other future model series from Mercedes-AMG. Then, however, installed lengthways, profoundly revised and once again significantly increased in performance. The engineers aim to ensure that the further developed M 100 will once again surpass the world’s highest liter output of all four-cylinder series engines to date.
The greatest innovation is the electric exhaust gas turbocharger, which is being implemented for the first time in a series vehicle. This technology comes directly from Formula 1 and is called MGU-H (Motor Generator Unit Heat) there. The identical system is already giving wings to the Mercedes-AMG Project ONE hypercar.
The electric exhaust gas turbocharger resolves the conflict of objectives between a small, fast-responding charger, which, however, achieves a comparatively low peak performance, and a large charger high peak performance, which in turn responds with a significant delay.
exhaust gas turbocharger with integrated electric motor: agility redefined
The highlight of this innovative charging system: an electric motor that is around four centimeters wide is integrated directly on the shaft of the exhaust gas turbocharger (charger shaft), between the turbine wheel on the exhaust side and the compressor wheel on the fresh air side . This drives the shaft of the exhaust gas turbocharger, electronically controlled, and thus accelerates the compressor wheel before the exhaust gas flow takes over the drive. The electrification of the turbocharger significantly improves the response from idling speed and across the entire speed range.
The result: the combustion engine reacts even more spontaneously to accelerator pedal commands, and the entire driving experience is significantly more dynamic and agile. In addition, the electrification of the turbocharger enables higher torque at low speeds compared to non-electrified charging, which also increases agility and optimizes the ability to accelerate from a standstill. Even if the driver takes off the gas or brakes, the technology of the e-turbocharger is able to maintain the boost pressure at all times, so that a continuous direct response is guaranteed.
The turbocharger is operated with the 400 Volt electrical system operated and thus reaches speeds of up to 150. 000 / min, which enables a very high air throughput. The charger and the electric motor are on connected to the high-temperature cooling circuit of the combustion engine in order to always create the best possible temperature environment. The power electronics are cooled by the low-temperature circuit.
With the four-cylinder performance hybrid, more than 330 kW strong AMG 2.0-liter turbo engine (with electric exhaust gas turbocharger) with an up to 150 kW electric motor can be combined. The total output and the total torque enable future AMG models to achieve performance levels that are even better than today’s comparable vehicles with V8 engines without hybrid drive. The high agility, performance and efficiency of the hybrid 4-cylinder drive train will initially come onto the market in the future generation of the Mercedes-AMG C-Class.