ATPUNIKAT

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ATP-UNIKAT
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• 1. Background
• In spite of the grown use of vehicle dynamics
  software, the real effects of the chassis
  kinematic can only be verified in real
  road-testing. Especially the combination of the
  adjustment of different parameters as well as the
  development of useful stepwidths during the
  chassis setup-process on series cars are only
  possible by time- and cost-intensive
  manufacturing of prototype parts.
• UNIKAT Universal Chassis
• Targets
• Basis investigations of the effects of kinematic
  parameters on vehicle- dynamics and comfort.
• Subjective impressions of kinematic influences.
• Effects of masses and centers of gravity on
  vehicle-dynamics.
• Investigations of brake- and tire-effects.

Baseline for the Development of the
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• 2. Tasks for Development
• Development of a vehicle with adjustable masses
  and kinematic.
• Maximum of variability of all vehicles
  attributes relevant to vehicle-dynamics and
  comfort.
• Variabilities should be adjustable while driving
  or by a minimum of complexity.

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3. Realization The Unikat was developed and
manufactured by the ATP Automotive Testing
Papenburg GmbH. Under an ATP-Projectmanagement
most of the constructive work was performed by
students of the Universities of Applied Science
in Osnabrück and Hamburg.
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3. Realization All constructions were made
in-house. Most all parts were fabricated in the
ATP-workshops.
Project-start 07/2004
Rollout 10/2005
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• 3.1. Chassis
• Steel-spaceframce made of square-tubes
• Mass 194 kg

1. Bendingmode vertical 101,1 Hz
1. Torsionmode 62,2 Hz
1. Bendingmode lateral 72,2 Hz
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• 3.2. Suspension
• Double-wishbone suspension units
• Anti-roll-bars adjustable while driving
• Rack and pinion steering column with adjustable
  ratio
• Cantilever coilover-springs with patented
  adjustability of the ratio

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3.2. Suspension
Federratenverstellung
Pendelstütze
Querlenker oben
Stellmotor
Ratio continously adjustable from 0,8 bis 0,5
Radträger
Federbein
Querstabilisator
Querlenker unten
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• 3.3. Adjustabilities
• Wheelbase
• Camber
• Roll-centers
• Scrub-radius
• Trail
• Toe-in
• Anti-Dive
• Track

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• 3.4. Brake-System
• Dual brake-system with adjustable brake-force
  distribution front/rear
• Brake-booster, adjustable pedal-ratio.
• ventilated 15 brake-discs, single-piston
  calipers

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• 3.5. Driveline
• Suzuki Swift GTI 4-Cylinder, 115 hp, Five-speed
  gearbox, rear-wheel drive
• Exhaust-system with adjustable sound

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• 3.6. WeightBalance
• Application of ballast-weights to influence mass,
  center of gravity and inertias

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• 3.7. Measurement Equipment
• 2D Datarecording, Force-Transducing
  Steering-Wheel, Sensors for Suspension Travel,
  Steering-Angle, Wheel-Revs, Brake-Pressure,
  Several Accelerations etc.
• Additional the application of MTS-Wheels,
  DGPS-Gyro and othe equipment is possible

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• 4. Usage
• The UNIKAT will be used for several seminars and
  can be used by customers on a rental basis on the
  ATP-Proving-Ground in Papenburg.
• Some UNIKAT-seminar contents
• Chassis set-up basics
• Quantity and quality of the effects of spring-
  and damper-rates
• Influence of roll-center, kingpin-angle and
  camber on vehicle dynamics
• The influence of the steering geometry on vehicle
  dynamics
• Tire influences on vehicle dynamics
• Influence of wheelbase, track width and inertia m
  omentum
• Basics of brake development
• Measures to influence under- and oversteering
• The measurement equipment that is permanently
  installed in the vehicle enables to support the
  subjective appraisal by objective data.

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UNIKAT-Series

• 5. UNIKAT II
• The UNIKAT II is the next step in development
  regarding the functional and constructive aspects
  of the current UNIKAT.
• Targets
• Design for a small-series manufacturing
• More adjustabilities
• Simplification of adjustments
• Variable driveline
• Variable stiffness of spaceframe
• Improved ergonomics
• Optimized package

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UNIKAT-Series

• 5.1 Chassis
• Steel-spaceframe as main-chassis
• Steel-spaceframe as engine-chassis
• Bolted roof-and rear-frame for stiffness
  variation
• Bolted subframes for front- and rear-suspension
• Adjustable wheelbase by changeable subframes

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UNIKAT-Series

• 5.2. Suspension
• functional like UNIKAT 1
• optimized geometry

Rear Suspension
Front Suspension
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UNIKAT-Series
5.2. Suspension
Shock absorber
Upper wishbone
Actuator
Upright
Ratio continously adjustable from 0,8 bis 0,5
Lower wishbone
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UNIKAT-Series

• 5.2. Suspension
• suspension travel curve

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UNIKAT-Series

• 5.3. Adjustabilities
• Like UNIKAT 1 with optimizations
• easier adjustment of anti-roll-bar
• improved adjustability of trail
• electric power-steering with steering-automatizat
  ion
• electro-hydraulic adjustment of spring-damper
  ratio

Anti-roll-bar adjustment Softest position
Hardest position
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UNIKAT-Series
5.3. Adjustabilities Anti-Roll-bar function
gleichseitige Einfederung
wechselseitige Einfederung
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UNIKAT-Series

• 5.4. Brake-System
• Dual brake-system with adjustable brake-force
  distribution front/rear
• Brake-booster, adjustable pedal-ratio.
• ventilated 15 brake-discs, single-piston
  calipers
• ABS-system optional

• 5.5. WeightBalance
• Application of ballast-weights to influence
  mass, center of gravity and inertias
• More front-axle load planned as for UNIKAT 1

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UNIKAT-Series

• 5.6. Driveline
• VW 1,4 l TSI 4-Cylinder with compressor und
  turbo-charger (alternative 1,4 l natural
  aspirated engine),
• 170 hp,
• Five-speed gearbox, rear-wheel drive
• Cable-shift
• Alternative
• Front-engine package
• Also 2 engines with two gearboxes and
  four-wheel-drive available