^ Didn't find anything in the article below. But MB Passion was in Stuttgart recently and just revealed some P3 electric rear axle details, instead.
IN THE FUTURE, AMG WILL COMBINE 4- AND 8-CYLINDER ENGINES WITH ELECTRIC DRIVES
Mercedes-AMG has now presented its new modular “Performance Hybrid” concept for the first time, in which eight- but also four-cylinder engines are combined with a permanently excited synchronous electric motor. The electric motor offers up to 150 kW and 320 Nm of torque and is positioned on the
rear axle by means of a
two-speed gearbox .
Technology for P3 hybrids for 4 and 8 cylinders from Affalterbach
The modular “performance hybrid” concept combines either an AMG eight or four-cylinder engine with a permanently excited synchronous electric motor, a performance battery specially developed by AMG and the fully variable all-wheel drive AMG Performance 4MATIC+. Depending on the model series, the electric motor has
a maximum output of 150 kW and 320 Nm torque and is positioned on the rear axle where it is integrated into a compact
electric drive unit with an electrically switched two-speed gearbox and electronically controlled rear axle locking differential.
Modular concept for several series can be rolled out
The electric motor was exclusively developed by AMG and works basically and without detours via the AMG SPEEDSHIFT MCT 9G transmission on the rear axle and can thus convert its power directly into propulsion, be it for the extra boost when starting, or even accelerating or for overtaking. As is typical for the design, the full torque is used immediately, which promises particularly agile starting behavior. Depending on the driving situation, the integrated,
electronically controlled rear axle locking differential can be used to allocate the optimum torque to each rear wheel, which is a noticeable gain for the driver - above all more agile accelerating out of bends.
As slip increases on the rear axle, the drive power of the electric motor is briefly transferred to the front axle for more traction, which enables a mechanical connection by means of the cardan shaft and drive shafts of the front wheels. The positioning on the rear axle also
improves the weight and axle load distribution in the vehicle and thus has a positive effect on handling. In addition, the recuperation has a very high level of efficiency because only minimal mechanical and hydraulic losses from the engine and transmission are possible.
With the 4-cylinder variant one speaks of 50:50 weight distribution, whereby the additional weight should be around 200 kg. AMG promises to maintain or even exceed today's high level of performance in the future.
The automatically shifting
two-speed transmission on the rear axle uses an electric actuator to engage second gear at the latest from 140 km/h, which corresponds to the maximum speed of the electric motor of around 13,500 rpm. The electric motor smooths the gear changes of the MCT transmission of the combustion engine and not only increases driving comfort, but also contributes to a more agile driving experience. Technically possible are more than 600 kW system power and over 1,000 Nm system torque, depending on the future vehicle, this enables acceleration of less than 3 seconds to the 100 km/h mark.
In
AMG DYNAMIC SELECT to stand six driving programs: "Electric", "Comfort", "Sport and" Sport+ "and" RACE "and used "Individual" what the response of the drive and transmission, as well as the steering characteristic, the suspension damping or customize the sound. The programs are selected using the rocker switch in the center console or the AMG steering wheel buttons. You always start in “Silent Mode” in “Comfort”.
- “Comfort”: starting electrically as possible, early upshifting of the MCT 9G transmission, chassis + steering with emphasis on comfort.
- “Electric”: Purely electric driving from a standing start up to 130 km/h. Thanks to the mechanical connection to the 4MATIC+ components, all-wheel drive is also available.
- “Sport”: Starting with both engines with the interaction of the drives depending on the situation. The boost function of the electric motor is released earlier. Basically sporty characteristics with more agile response and sporty characteristics with earlier downshifts.
- “Sport+”: Like Sport, but even higher boost performance and more agile behavior with targeted torque interventions when upshifting with cylinder suppression for optimal shift times. Increased idle speed for faster starting. Overall, more dynamically coordinated characteristics.
- “RACE”: offers maximum performance, full electrical boost power, strong battery recharging with low power requirements for maximum electrical availability
- “Individual”: individual setting option (including exhaust system).
Further advantages of the hybrid drive result for the vehicle dynamics control. Instead of the ESP® braking intervention, the electric machine can regulate traction as soon as a wheel signals too much slip . The ESP® does not have to intervene at all or only has to intervene later.
M 139 in longitudinal installation in the 4-cylinder variant
In the 4-cylinder, the M 139 is used lengthways, which has been thoroughly revised and significantly increased in performance. It is to be expected that the previous liter output will be exceeded again. The biggest innovation is the new electric exhaust gas turbocharger, which is being used here for the first time in a series vehicle. The charger solves the trade-off between a small, fast-responding charger, which, however, achieves a comparatively low peak output, and a large charger with a high peak output, which in turn responds with a significant delay. A narrow electric motor is used here as a solution, which is positioned between the turbine wheel on the exhaust side and the compressor wheel on the fresh air side and accelerates the compressor wheel before the exhaust gas flow takes over the drive. This significantly improves the response behavior from idling speed and over the entire speed range. The engine reacts even more spontaneously. The turbocharger itself reaches speeds of up to 156,000 rpm and is connected to the combustion engine's cooling circuit. The power electronics are cooled by the low-temperature circuit.
With the four-cylinder performance hybrid, the
more than 330 KW / 450 PS turbo engine can be combined with an electric motor of
up to 150 kW / 204 PS.
Modular concept
With the presentation of the modular concept, the Affalterbach company is currently foregoing an exact confirmation for future use of the 4 and 8 cylinder variants. It is clear that the drive will be available as an 8-cylinder (with over 800 hp) in the AMG GT 4-door coupé as well as in the 4-cylinder variant in the new C-Class. An
E PEFORMANCE model can also be expected in the upcoming SL from the R 232 series. How the performance levels will then be called remains to be seen - so whether the AMG GT in particular will be named as the 73 e 4MATIC+ remains to be seen.
AMG high performance battery
The development of the lithium-ion energy storage system began in 2016 and benefited from the technology transfer from Formula 1. The AMG 400 volt battery is based on innovative direct cooling, with 560 cells being cooled individually for the first time. This is done permanently using high-tech coolants based on an electrically non-conductive liquid. For this purpose, the AMG specialists developed cooling elements as thin as a millimeter, using around 14 liters of coolant and their own high-performance pump.
The coolant circulates from top to bottom through the entire battery past each cell and also flows through an oil / water heat exchanger that is 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 on the front of the vehicle, which releases the heat to the ambient air. The system is designed in such a way that even heat distribution is guaranteed, with the battery
always staying in the
optimal working temperature window of 45 degrees Celsius. In this way, the developers from Affalterbach ensure that performance is available whenever it is needed.
AMG starts with the internally named HPB80 variant with 6.1 kWh capacity with 70 kW continuous and 150 kW peak output for ten seconds. The battery weighs 89 kilograms and achieves a power density of 1.7 kW per kilogram - roughly twice as much as conventional batteries achieve. Further expansion stages are being considered.
Images:
MBpassion.de / Philipp Deppe
https:///2021/03/amg-kombiniert-zukuenftig-4-und-8-zylinder-motoren-mit-e-antrieb/
