Predictive active suspension in the Audi A8 flagship model

Predictive active suspension in the Audi A8 flagship model

18.07.2019: Immense spectrum: maximum comfort or outstanding agility The electromechanical suspension system can actuate each wheel individually First-class travel experience: intelligently reduced longitudinal and transverse forces

  
Immense spectrum: maximum comfort or outstanding agility
   
  
The electromechanical suspension system can actuate each wheel individually
   
  
First-class travel experience: intelligently reduced longitudinal and transverse forces




Audi is now offering another high-tech innovation for the Audi A8 luxury sedan – predictive active suspension. Depending on the chosen settings, it gives the brand’s flagship model the supreme ride comfort of a chauffeur-driven limousine or the firm handling of a sports car. In Germany and other European markets, predictive active suspension can initially be ordered for the TFSI versions of the Audi A8.


Predictive active suspension in the Audi A8 is a fully active suspension system. Its electromechanical actuators adjust the suspension. They can lift up or force down each of the luxury sedan’s wheels individually, to actively manage the body’s ride height in every situation. The active suspension can lift or lower the body by up to 85 millimeters (3.3 in) from its central position at all four corners within five-tenths of a second.


There are compact electric motors located close to each of the Audi A8’s wheels, running off the car’s 48-volt primary electrical system and governed by power electronics. A belt drive and a compact harmonic drive step up the electric motor’s torque almost 200-fold to 1,100 Nm (811.3 lb-ft) and apply it to a steel rotary tube.



The latter is permanently attached to a preloaded titanium rod located inside it and capable of turning through more than 20 degrees. From the end of the rotary tube, the force is transmitted to the suspension via a lever and coupling rod – at the front suspension it acts on the spring strut, and at the rear suspension on the transverse link.


Predictive active suspension operates highly efficiently. Its average power consumption is in the range of just 10 to 200 watts – much less than that of comparable hydraulic systems. Whenever the driving physics try to force the body down on the wheel, for example on poorly surfaced roads, predictive active suspension counteracts this effect.



 An extremely sharp impulse – as encountered on the racetrack, for example – will produce a very short but high energy demand of potentially up to 6 kilowatts. Depending on the driving situation, up to 3 kilowatts can also be fed into the 48-volt battery.





Wide spectrum: from “dynamic” to “comfort plus”



In conjunction with the air suspension and Audi drive select dynamic handling system (both standard), predictive active suspension in the Audi A8 enables an unprecedented spectrum for driving. In the “dynamic” profile, the luxury sedan acquires the handling of a sports car. The A8 turns in firmly, and when cornering fast with 1 g lateral acceleration the body inclination (roll angle) is just 2 degrees – as opposed to more than 5 degrees with standard suspension.



In every driving situation the rolling moment is optimally distributed and dive when accelerating or braking is reduced to a minimum. The result is a sporty quality of self-steering in the neutral to slightly oversteering range. The Audi flagship model runs with rail-like precision and guarantees outstanding, safe handling characteristics.







Innovative technologies: prediction as well as reduced transverse and longitudinal forces



If, on the other hand, the “comfort plus” profile is selected in Audi drive select, the luxury sedan glides with velvety smoothness over any bumps in the surface. The predictive active suspension works together with the front camera. Thanks to this camera, the flagship model identifies uneven surfaces before they are reached and predictively regulates the active suspension. Even before the car hits a bump, the predictive function developed in-house at Audi signals the correct positioning travel to the actuators and actively adjusts the suspension.



This reduces body movement and compensates almost entirely for long road undulation or similar unevenness. This complex process takes just a few milliseconds: the camera generates information about the surface properties 18 times a second. The electronic chassis platform processes the road surface data and precisely actuates all suspension components almost in real time.



In the “comfort plus” profile, predictive active suspension offers another innovative feature: transverse force reduction. Upon entering a bend, this raises the body on the outer side of the bend while lowering it on the other side. The A8 leans into the bend by up to 3 degrees, rather like a motorcycle. This angle reduces the transverse forces.


The effect is especially impressive in the speed range from 80 to 130 km/h (49.7 to 80.8 mph) and at lateral acceleration of up to 0.4 g. The driver and passengers barely notice the cornering maneuver – and even a full cup of coffee in the cup holder will not spill. The intensity of transverse force reduction depends on a number of factors: the road speed, the g forces encountered, and the road surface. The electronic chassis platform – the central suspension control unit – processes the data supplied by the sensors and passes it on to the active suspension’s control unit.



For straight-line travel in the “comfort plus” profile, predictive active suspension can equally reduce the forces acting on the human body. When accelerating hard or braking in situations that could impact comfort, it equalizes the body’s pitching movements – when stopping at lights, for example.



The slight overcompensation that it realizes means the occupants are if anything pushed very gently into their seats instead of against their belts. Predictive active suspension even gives the occupants lavish comfort treatment when the car is at a standstill. When the door handle of the A8 is operated, the body is quickly raised by up to 50 mm (2.0 in) – for even easier entry and exit. The new “elevated entry” function makes this possible.




With pre sense 360°: even greater safety



Predictive active suspension also increases passive safety in combination with the “pre sense 360°” safety system, part of the assistance system “City”. It operates in conjunction with the central driver assistance system (zFAS), which uses the merged sensor data to identify hazardous situations around the car.



In an impending side impact at more than 25 km/h (15.5 mph), the active suspension raises the body by up to 80 millimeters (3.1 in) on the side of the impact. This brings the sill into a better position to absorb the impact energy. Deformation of the cabin and the loads acting on the occupants, above all in the chest and abdominal areas, can thus be reduced by up to 50 percent compared with a lateral collision in which the suspension is not raised.



Customers in Europe can order predictive active suspension in the Audi A8 from August 2019. The extra charge in Germany is EUR 5,450.

   


Stefan Grillneder - photos Audi


Permanent-URL: http://www.automobilsport.com/predictive-active-suspension-audi-a8-flagship---194361.html

18.07.2019 / MaP

More News

Mitsubishi Motors' New Brand Center "MI-Garden GINZA" to Open in September 2019
17.07.2019
Mitsubishi Motors Corporation (MMC) announces that it will open its new brand center, MI-Garden GINZA (pronounced "My Garden"), to showcase the combination of inspired design, time-tested engineering, and pioneering technologies that the Mitsubishi Motors brand and its brand message "Drive your Ambition" represent.  more >>
The BMW i3 by AC Schnitzer
17.07.2019
- improved aerodynamics and driving dynamics Anyone who wanted to drive an innovative BMW i3 with alternative drive had to do this without sporty accents. This is now changing: the Aachen tuning experts from AC Schnitzer have developed a tuning pr more >>
LIQUI MOLY -Fehlermeldung im Öl
16.07.2019
Durchwachsene Halbjahresbilanz bei LIQUI MOLY –erhebliche Schwierigkeiten durch neue Software Photo: Geschäftsführer Ernst Prost ist wütend wegen der Computerprobleme. more >>
SEAT starts production of a new gearbox
15.07.2019
•    The SEAT Componentes plant is now making the MQ281 transmission•    The maximum annual capacity of the new gearbox totals 450,000 unitsSEAT Componentes, one of the Spanish brand's three production centres more >>
New gearbox generation enables CO2 savings of up to five grammes per kilometre
15.07.2019
MQ281 manual transmission    More efficiency for the volume segment thanks to the new manual gearbox MQ281     Initially installed in the new Passat; other Volkswagen models to follow suit more >>
Ligier Automotive takes back direct control of the distribution of its racing cars in the United Kingdom
15.07.2019
Following the announcement made by United Autosports to run an Oreca chassis in the World Endurance Championship, Ligier Automotive terminates its exclusive distribution agreement in the United Kingdom with United Autosports and takes back direct control of the distribution of its racing cars in this territory. more >>
Reopening of renovated test tracks at the Nardò Technical Center
12.07.2019
Strategic development of the proving ground for future mobility testingAn important milestone dedicated to the vehicle testing of tomorrow: The renovation of the 12.6 kilometer long iconic car circular track and car dynamic platform of the Nardò Technical Center in Apu more >>
Toyota starts Automated Driving testing on urban public roads in Europe
11.07.2019
· Automated vehicle with safety driver will drive in Brussels city centre· Purpose is to study impact of diversity of human behaviour on automated driving systems· Adding European conditions to the car’s understanding, after successful drives in Japan and the US more >>
Autonomous vehicles reach a new milestone thanks to the collaboration between Groupe PSA and VINCI Autoroutes
11.07.2019
•    Groupe PSA and VINCI Autoroutes have tested new autonomous vehicle features in Saint-Arnoult-en-Yvelines (France), following on from the trial carried out in July 2017, which led to the crossing of a tollgate in full autonomous mode for the firs more >>
SEAT and Grupo Sesé link up via drone
11.07.2019
•    For the first time in Spain, two companies launch a parts delivery service using drones•    The drones will guarantee just in time delivery of parts in only 15 minutes•    This innovation will increase efficiency and flexibility at the Martorell plant more >>
#THE1challenge: The new BMW 1 Series gets people moving on TikTok.
10.07.2019
The new BMW 1 Series is getting people moving – not just on the road but online, too. BMW is extending its current campaign for the new model in the premium compact segment with the addition of a challenge on the intern more >>
SEAT updates its range, from the Tarraco to the Mii
09.07.2019
•    SEAT is making enhancements to its range of vehicles to improve the  attractiveness and usability of its range•    The updates will add new convenience features, safety technologies, a wider choice of trims and fresh colour options  more >>
FCA What's Behind -Balocco Proving Ground
05.07.2019
•    This series visits the iconic FCA proving ground in Balocco (Italy), which operates 24 hours a day with 200,000 hours of tests conducted every year.•    The activities and facilities enable simulation of ten years of a vehicle's life in just five months of testing to ensure the highest standards of quality, safety, rel more >>
Volkswagen Passenger Cars strengthens IT competence worldwide
04.07.2019
Dedicated IT organization at brand for tailor-made digitalization     Abdallah Shanti takes lead The Volkswagen Passenger Cars brand is laying the groundwork for efficient and tailor-made digitalization within the company going forward with a new IT organization. Abdallah Shanti has been name more >>
PSA Retail opens two Opel points of sale in Cologne
04.07.2019
.... a German first, as part of a wider European strategyPSA Retail, the distribution subsidiary of Groupe PSA, is opening one new Opel site in Cologne today, namely at Raderberggürtel, and will open a second outlet on the Widdersdorfer Strasse. more >>
TOYOTA GAZOO Racing to Commence Sales of GR Supra GT4 in 2020
04.07.2019
-  Promoting ever-better cars through customer motorsportsTOYOTA GAZOO Racing confirmed today that it will launch the GR Supra GT4, a race car for customer teams*1, in 2020. The announcement comes in response to growing customer expectations worldwide following the unveiling of the GR Supra GT4 Concept at the Geneva International Motor Show in more >>
A temperature difference of 100 degrees
02.07.2019
   Snow and sand, two different terrains with a common requirement of thinking ahead to drive on them correctly    Driving asistants are key to adapt to the different situations    Tyres, gear selection and braking are where the similarities end more >>
Automobili Lamborghini inaugurates its new paint shop in Sant’Agata Bolognese
02.07.2019
•    Paint shop for the Urus Super SUV offering a high level of color personalization •    Plant featuring innovative technologies inspired by the concepts of Factory 4.0•    The first plant in the world to use an artificial intelligence system applied to the painting process•   more >>
Comprehensive changes at Volkswagen Human Resources
02.07.2019
Several new leadership appointments     Board Member for Human Resources Kilian: “We are focusing on interchange and collaboration between sites and companies” The HR division at the Volkswagen brand is making new leadership appointments in human resources at several sites and companies this summer. In a more >>
Peter Schäfer becomes Chairman of the Management Board of Porsche Engineering
01.07.2019
Malte Radmann heads into retirementChange at the top: From July 1, Peter Schäfer will become Chairman of the Management Board of Porsche Engineering. Schäfer will succeed Malte Radmann, who is Chairman of the Management Board of the international engi more >>
Inauguration of the new Renault Bucharest Connected centre
29.06.2019
    “Renault Bucharest Connected” is Groupe Renault’s new decision-making centre in Romania. 3,200 employees have been brought together in a building that houses the new Design Centre and also the engineering and tertiary functions. more >>
Volkswagen Group commits suppliers to sustainability
28.06.2019
Sustainability rating for suppliers valid from 1st July 2019     Focus on risks related to human rights, environmental protection, corruption As of 1st July 2019, the Volkswagen Group will introduce a worldwide Sustainability Rating for its suppliers. This enables the company to assess the sustainability conduct of more >>
New McLaren 720S Ride-On children model
27.06.2019
 First-ever McLaren 720S ‘Ride-On’ builds on earlier McLaren P1TM children’s model with even greater McLaren authenticity    Exclusive Papaya Spark launch colour for official McLaren retailers – just like the re more >>
BMW Group trial vehicle “Power BEV”: #NEXTGen19
25.06.2019
from 0 to 100 km/h (62 mph) in comfortably under three seconds.The BMW Group trial vehicle “Power BEV” presented during #NEXTGen explores what is technically possible. The vehicle is fitted with three fifth-generation electri more >>
Genesis opens doors on first Australian flagship studio in Sydney
25.06.2019
•    Genesis Studio Sydney opening marks the launch of the Genesis brand in Australia•    Flagship Studio unveiled by Executive Vice President, Global Head of the Genesis Brand, Manfred Fitzgerald, at a glittering cocktail event•    The stunning Studio in Sydney CBD showcases new Genesis G70 more >>
SEAT - Tips for carefree driving this summer
25.06.2019
•    People make many more short trips on holidays, and their complacency  can increase the possiblity of accidents•    Summer habits can be risky and lead to fines•    A car is no place for flip flops, swimsuits or inadequate postures•    An interior temp more >>
Change on the Volkswagen Supervisory Board: Conny Schönhardt succeeds Birgit Dietze
24.06.2019
There will be a change to the composition of employee representation on the Supervisory Board of Volkswagen Aktiengesellschaft. Conny Schönhardt (41), who took on responsibility for Strategic and Political Planning on the management board of IG Metall in January 2019, is taking Birgit Dietze’s (46) seat on the Supervisory Board as of 21 June 2019. The more >>
Software Development Center: Volkswagen opens IT-Center
20.06.2019
....in the Gläserne Manufaktur in Dresden    The Volkswagen Industrial Cloud is co-developed in Dresden    Collaboration with Amazon Web Services (AWS) and Siemens    Creation of up to 80 new jobs in Group IT in the capital of Saxony Volkswagen has more >>
Volkswagen video explains the stricter WLTP test procedure
20.06.2019
Video explains elements including the mobile exhaust gas measurement laboratory for on-site measurements of customer vehicles.    The next stage of the WLTP (Worldwide Harmonized Light Vehicles Test Procedure) requires numerous changes to more >>
CUPRA breaks ground on new headquarters for 2020
20.06.2019
  Construction begins on the CUPRA headquarters to house the new brand’s central offices with motorsport at its core    The former SEAT Sport building will become the CUPRA Racing Factory    Both facilities are scheduled to be completed by the end of the year    The announcement was made by CUPRA more >>
Audi and Sony Pictures Entertainment Team Up On “Spider-Man™
20.06.2019
- Far From Home” Digital Content    All-electric Audi e-tron* appears in addition to Audi A7* and all-new Audi Q8* in Sony Pictures’ “Spider-Man: Far From Home”        Tom more >>
MINI marks double celebration with unique Italian Job Charity screening
20.06.2019
- MINI celebrates 60th birthday - The Italian Job film marks 50th anniversary - First ever gathering of original cars which survived filming - Oscar-winning producer Michael Deeley guest of honour, with special message from Sir Michael Caine - New book launched to celebrate the film’s half century: The Self Preservation Society: 50 Y more >>
Volkswagen and Schwarz Group to be strategic e-partners
19.06.2019
In future, Volkswagen's electric WeShare fleet in Berlin will also recharge at the 140 new charging stations of Lidl and Kaufland.    Food retailers Lidl and Kaufland, which form part of the Schwarz Group, to install 140 public charging points in Berlin    Number of public charging points in German capital to be boosted by almost 2 more >>
SEAT - Five concept cars that shaped the future
19.06.2019
•    Showcars map out the design lines of future generations of cars, but they have also set mobility trends •    SEAT's historic concept cars have paved the way in the areas of electric and connected vehicles or for the rise of SUVs•    The IBE, the Tribu or the electric Toledo for the Barce more >>
Rolls-Royce Motor Cars releases Wraith Eagle VIII sketches
14.06.2019
.... on the centenary of the first non-stop transatlantic flightTo mark the centenary of the first non-stop transatlantic flight, Rolls-Royce Motor Cars today releases unseen design sketches of its latest Collection Car, Wraith Eag more >>
Hyundai and Kia Announce Investment in Aurora
13.06.2019
•    Investment expected to strengthen existing partnership•    Companies to collaborate on autonomous vehicle platforms and services powered by the Aurora Driver Hyundai Motor Grou more >>
2019 Honda Passport Achieves Top NHTSA Overall Safety Rating
13.06.2019
    Every 2019 Honda model evaluated in NHTSA NCAP safety testing has achieved a top 5-Star Overall Vehicle Score    85 percent of Honda vehicles sold now feature Honda Sensing®The all-new 2019 Hon more >>
Out of this World Lexus Jet Stars in Sony Pictures’ Men in Black: International
12.06.2019
Lexus QZ 618 Galactic Enforcer jet helps save the universe with never-before-seen advanced alien-fighting technologyWith today’s red carpet premiere of Sony Pictures’ highly-anticipated Men in BlackTM: International comes the world debut of the Le more >>
CUPRA pairs with the World Padel Tour until 2021
12.06.2019
 The brand is the new sponsor of the professional padel circuit •    CUPRA will be present at six international padel tournaments in 2019•    The brand will be the premium sponsor more >>

2001-2020 automobilsport.com full copyright