Mercedes-Benz VISION EQXX BEV Prototype - 620+ miles on a Single Charge

Discussion in 'Mercedes-Benz' started by xcel, Apr 26, 2022.

  1. xcel

    xcel PZEV, there's nothing like it :) Staff Member

    The Mercedes-Benz VISION EQXX Prototype has taken on the roads of Europe demonstrating its outstanding range and efficiency as it effortlessly covered more than 621 miles on a single battery charge. The journey started in cold and rainy conditions with a full pack and at the finish, the battery's state of charge was 15 percent. This resulted in a low of 5.4 miles/kWh.

    Mercedes-Benz EQXX Prototype

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    There's a reason why road trips are iconic is the stories they generate. A road trip defines freedom, individuality, the very spirit of the automobile and the passing world. Stick a pin in the map, boot up the car, and go for a drive.

    Mercedes-Benz has defined a clear goal, maximum efficiency through innovation.

    The VISION EQXX prototype is the result of a comprehensive program that provides a blueprint for the future. Many of its design features are being integrated into current and future designs.

    The VISION EQXX is packed with innovations. This software-defined research prototype is part of a far- reaching technology program that combines the latest digital technology with the agility of a start-up and the speed of Formula 1. The mission in developing the VISION EQXX was to break through technological barriers across the board. To show what is electrically "feasible".

    With its low cd of just 0.17, the EQXX gives the wind virtually nothing to grab onto. This world-beating figure starts with the basic shape of the body, cradling the smooth-surfaced dome of the greenhouse as it flows to the rear. Equally beneficial to the aerodynamics are the small frontal area of 22.8 ft² and the reduced rear track. Because this is 2 inches narrower than at the front, the rear wheels roll in the slipstream of the front wheels. The active rear diffuser, which automatically deploys at 37 mph, improves airflow and significantly reduces drag.

    The technology vehicle includes extremely low rolling- resistance rating of 4.7. Bridgestone developed these specifically for the VISION EQXX in partnership with Mercedes-Benz. By way of comparison, the current EU tire label requires a figure of 6.5 for the top rating in Class A. By comparison, the production EQS uses tires with a rolling resistance of 5.9. With the VISION EQXX, Mercedes-Benz is now going one step further. A striking feature is the size of the new tires. The dimensions 185/65 R 20 97 T mean they have a large diameter and a narrow tread. The specialist Turanza Eco tires combine two innovative Bridgestone technologies that enable a higher range: ENLITEN technology reduces both rolling resistance and weight by up to 20 percent. The ologic technology reduces tire deformation while driving, in part through a more tensioned belt section. In addition, the normally odd transition from the tire to rim was optimized in cooperation with the Mercedes-Benz aerodynamics team.

    The VISION EQXX's special features also include its carefully thought-through lightweight construction, which has a particularly positive effect on uphill climbs with its unladen weight of just 3,869 lbs. It is a stripper and by no means a production ready BEV by any stretch.

    The lightweight design concept of the VISION EQXX include a sustainable carbon- fiber-sugar composite material used for the upper part of the battery and the BIONEQXXTM rear floor, manufactured using an aluminum casting process. The light metal structural component replaces a much heavier assembly of several interconnected parts. It has gaps in places where structural strength is not required, thus saving material. This innovative design approach results in a weight saving of up to 20 percent compared to a conventionally manufactured component.

    A large part of the weight efficiency is also due to the dedicated electric chassis with lightweight F1 subframe and aluminum brake discs. Another is the 1,091 lb, 100 KWh battery developed specifically for the VISION EQXX that is 50 percent smaller and 30 percent lighter than the 107 KWh unit in the EQS.

    The VISION EQXX regens to almost zero mph while the mechanical brakes are barely touched. This makes it possible to use new types of aluminum brake discs that weigh significantly less than their steel counterparts.

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    The VISION EQXX charges not only at charging stations but via its fixed solar roof. The 117 solar cells feed the 12V which supplies power to auxiliary consumers such as the infotainment and driver displays. Overall, the solar roof increases the range by more than two percent – which adds up to 16 miles on a daytime journey of over 600 miles.

    The electric drive unit in the VISION EQXX was developed with the F1 specialists at HPP, and has a peak output of 180 kW. Thanks to the torque available from 0 RPM and the very low aerodynamic and rolling resistance of the VISION EQXX, its full potential is barely tapped during this trip. Just like the battery, the electric drive unit is compact, lightweight, and highly efficient. Its average efficiency in this application is 95%. That means 95% of the energy from the battery goes to the wheels.

    This goes together with further efficiency benefits such as the reduction in drivetrain losses. The engineers succeeded in reducing the total losses in the drivetrain (motor, inverter and transmission) by 44% compared to a standard e-drive adding another two percent more range. The VISION EQXXs battery has an energy density of almost 400 Wh/l and operating voltage of more than 900 volts. There are further efficiencies from the active cell balancing, this ensures that energy is drawn evenly from the cells which increases the usable energy and range even more.

    Since the electric drivetrain generates minimal heat thanks to its high efficiency, passive cooling is sufficient throughout the journey. The cooling plate in the underbody uses the airflow to ensure even cooling. This aerodynamically highly efficient solution increases the range ~ 12 miles.

    The air control system would only open an additional airpath if there was an increased demand for cooling the electric drive or for climate control inside the cabin on hot days or if the heat pump was running on cold days. The airpath then connects the high-pressure zone at the front of the vehicle with the low-pressure zones along the top of the hood. This enables highly efficient thermal management with minimal air resistance. With the shutters open, the cd value would increase by only seven points (0.007).

    Whether e-drive or combustion engine, the amount of energy a motor consumes in practice ultimately depends a great deal on driving style. No shit sherlock!

    "Pedal to the metal" is not an option anywhere due to speed limits. However, the VISION EQXX assists the driver like a co-pilot with tips on the best possible hypermiling style. The efficiency assistant provides information on energy flow, battery status, topography and even the direction and intensity of wind and sun.

    The UI/UX features an all-new, one-piece display that spans the entire width of the interior. Elements of the user interface support seamless interaction between the driver and the vehicle. These include Artificial Intelligence (AI) that mimics the way the human brain works. In the VISION EQXX, Mercedes-Benz takes a radically new UI/UX approach. A game engine takes UI graphics to a whole new level. The UI shows how real- time graphics open new digital possibilities by reacting instantly to the driver's needs and bringing the real world into the vehicle.

    The VISION EQXX has proven the real-world potential of outstanding efficiency for electric vehicles with a lot more to come.

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    #MissionAccomplished: 621+ miles on a single battery charge.

    #EnergyWizard: Efficiency-enhancing measures lead to an outstandingly low consumption of 5.4 miles/KWh.

    #AeroChamp: Outstanding aerodynamics enables a benchmark drag coefficient of 0.17.

    #RollingEfficiency: Tires with a significantly lower rolling resistance and improved aerodynamic geometry, combined with lightweight magnesium wheels, provide range.

    #ElectricDrive: 95% from battery to wheels.

    #PassiveCooling: Passive drivetrain cooling via a cooling plate in the underbody.

    #SolarPower: Ultra-thin roof panels feed the battery system and provide up to 15 miles of additional range.

    Wayne
     
    EdwinTheMagnificent and BillLin like this.
  2. EdwinTheMagnificent

    EdwinTheMagnificent Legend In His Mind

    Nice. But I don't see the aluminum rotors being used in a production car.
    In the real world , humans decide how hard or late to brake. They get a perverse pleasure from braking hard.
    I see it every day.
     
    xcel likes this.
  3. Trollbait

    Trollbait Well-Known Member

    Didn't the Civic VX have aluminum rotors?
     
    xcel likes this.
  4. EdwinTheMagnificent

    EdwinTheMagnificent Legend In His Mind

    I'm not that old , lol. I mean , good question.
     
    xcel likes this.
  5. xcel

    xcel PZEV, there's nothing like it :) Staff Member

    Hi All:

    The Mercedes-Benz VISION EQXX breaks its own efficiency record on 747-mile summer road trip from Stuttgart (Germany) to Silverstone (UK) at an incredibly efficient 7.5 mi/KWh on a single charge!

    Mercedes-Benz VISION EQXX

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    The Mercedes-Benz VISION EQXX beats its own efficiency record in real-world driving with another 620 + mile road trip from a single battery charge.

    Along with proving the effectiveness of Mercedes-Benz electric efficiency technologies in a wide range of real-life traffic scenarios, the VISION EQXX’s long-distance journeys on public roads provide R&D experts with valuable data for the ongoing development program.

    The exceptional efficiency of the electric drive unit means it generates only minimal waste heat. The carefully engineered interaction of aero-shutters, coolant valves and pumps ensures the electric drive unit maintains the most efficient temperature balance at minimum energy cost. It encompasses a combination of innovative air-flow management and a cooling plate installed in the vehicle floor, enabling it to take advantage of the air flowing along the underside of the VISION EQXX. This is the most aerodynamically efficient way of keeping the electric drive unit cool under normal conditions, allowing an increase in range of around two percent in its most aerodynamic configuration.

    High ambient temperatures and stop-and-go highway traffic necessitated cooling of the electric drivetrain and passenger cabin. However, the on-demand cooling system took it all in stride with no significant impact on range. The multi-source heat pump in the VISION EQXX proved highly efficient at keeping the cabin temperature cool in the warm summer weather. During the 14 hours and 30 minutes of driving time, the AC was operational for just eight hours, yet had a minimal negative impact on overall energy consumption.

    With two successful 620 + mile road trips under its belt, the VISION EQXX has truly justified its claim as the most efficient Mercedes ever built.

    Work will continue on the development of many VISION EQXX technologies for application in future series-production vehicles.

    Wayne
     

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