OverviewThe 15 biggest innovations”The EQS is a milestone on the way to CO2-neutrality”Interesting facts & figures”Linking intelligence and emotion”Interesting facts & figuresThe transformers: thinking of tomorrow todayInnovative aesthetics in unmistakable purpose designEmbarking on the new era of purpose designThe EQS: Experience for all the sensesHere comes the new world record holderGentleperson of the new schoolNo cable reaches this farThe whispering class for the earsPowerful cell chemistry meets intelligent softwareFurther reducing the carbon footprint with green powerAlways connectedBecause the shortest route is not always the fastestActivating new functions after buying a new carConsistent digitisation and borrowings from interior design”The MBUX Hyperscreen is both the brain and nervous system of the car”Zero-layer design: the most important thing is now only one click awayWelcome to the big in-car showBetween comfortable tranquillity and an interactive, sensuous sound experienceQuick learner thanks to AIHEPA filter against airborne pollutantsAcoustic oases with summer rain, seagull sounds and rustling leavesHe who calls for silenceEfficient use of waste heat from the powertrainVirtual surround sound and extensive sound personalisationEmotive animations, colour feedback and additional visual warningsGreat suspension and ride comfort paired with high driving dynamicsThe rear wheels also steer as standardHigh-resolution light projection with innovative assistance functionsIntelligent support while drivingEasy entry into confined parking spaces and narrow entrancesUse your time in the car more effectively and conveniently have it park and unparkAccident protection is not a question of the powertrain concept

The new EQS: the noise and vibration comfort

Apr 15, 2021
Stuttgart

The EQS is the all-electric member of the S-Class family. This means that it must meet the highest expectations for acoustic comfort. The specifications therefore already defined a number of measures, including special acoustic foams in some of the profiles of the shell as well as the encapsulation of the eATS at the front and rear. The drive units are doubly insulated using rubber mounts. At the front axle this takes the form of a supporting frame, with a subframe at the rear axle.

Starting with the design of the electric powertrains (eATS), NVH (noise, vibration, harshness was a priority. The magnets inside the rotors are arranged in an NVH-optimised way (so-called sheet metal cut). This also reduces the use of rare earths. The shape of the winding, the so-called stator tilt, also supports vibration comfort, especially at low speeds. In relation to the permanent magnets of the rotor, the coils of the stator are obliquely wound. Otherwise, what is known as cogging torque could occur. This would lead to slight but unpleasant vibrations when driving very slowly.

In addition, the eATS have a special foam mat all around as an NVH cover. The lid of the inverter has a sandwich construction of three metal and plastic layers. The eATS are doubly decoupled from the body via elastomer bearings: At the front axle opposite a supporting frame and this against the body, and a rear axle carrier.

Highly effective spring/mass components provide continuous sound insulation from the cross-member under the windscreen to the floor of the boot. Acoustic foams are inserted into many carriers as early as the shell construction stage. Because the full-area main floor under the high-voltage battery is a component with a potentially high noise component, a new insulation part is used there. A foam sealed in foil, enclosed in the seal of the battery lid, is clamped between the battery and the floor and prevents excitation. In addition, the main floor is designed with beads for NVH reasons. These prevent resonance of the surface and thus the occurrence of a corresponding structure-borne sound. Two acoustic dividers in the very large tailgate reduce boom noise. These could be caused by roadway excitations and are favoured by the large volume of the cab including the bulkhead-free luggage compartment.

In addition, there are the measures of aeroacoustics, more on this in the specific Chapter.

Loading