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 under the magnifying glass: the two versions of rear-axle steering

Apr 15, 2021

The standard rear-axle steering with a steering angle of up to 4.5° contributes to the handy and dynamic impression of the EQS. Alternatively, the rear wheels can even turn in by up to ten degrees. This enables a turning circle of 10.9 metres. This corresponds to the turning circle of many models in the compact class. The variant with the large steering angle can also be unlocked later via an upgrade over the air (OTA). The respective rear-axle angles and trajectories are shown in the driving mode menu in the central display.

The interaction between the front-axle and rear-axle steering is configured to ensure agile responsiveness in urban and country traffic together with a very high level of stability. This results in e.g. small side-slip angles and a high level of yaw suppression. At high speeds the focus is more on stability, though without compromising precision and responsiveness. This added value is achieved by integrated actuation of the steering and brakes (ESP®), and considerably improves handling safety as a result.

The operating principle of rear-axle steering in detail: An electric motor drives a spindle at the rear axle via a drive belt. This makes axial adjustments to the spindle. Depending on the speed and the steering angle, the rear wheels turn in the same or the opposite direction as the front wheels (same direction or counter-direction). In simplified terms, this produces more agility and a smaller turning circle by counter-steering and more stability with same-direction steering. The environmental data of the vehicle sensors (radar, camera, ultrasonic) are used to adapt the maximum angle to the relevant situation. The system switches from counter-direction to same-direction steering at more than 60 km/h.