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Published byJadon Skerrett Modified over 9 years ago
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1 VEHICLE DYNAMICS
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2 Increase “track driving” vehicle performance: Lap time Stopping distance Standing start acceleration Increase “road driving” performance: Agility Steering response Body roll response Gear shifting response Sport / GT VEHICLE DYNAMICS MAIN GOALS
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3 F1-DCT Gear shift FrS-SCM Damping Control Michelin Pilot Sport Cup 2 Side Slip Angle Control (SSC) New Generation CCM brake system Sport / GT VEHICLE DYNAMICS: HOW WE DID IT CONTINUOUS EVOLUTION NEW CONTENT
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4 F1-DCT gear shift: New strategy to minimize response time 20% faster up-shifts vs 458 Italia 44% faster down-shfts vs 458 Italia FrS SCM damping control: New algorithm based on Frequency Domain: naturally matches road characteristics: -15% dynamic roll vs 430 Scuderia +20% traction on bumpy roadsvs 430 Scuderia Sport / GT VEHICLE DYNAMICS: CONTINUOUS EVOLUTION
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5 New Michelin Pilot Sport Cup 2: Specifically developed for 458 Speciale, guided by a unique integrated process to maximize vehicle performances +6% dry grip vs 430 Scuderia +5% wet grip vs 430 Scuderia Sport / GT VEHICLE DYNAMICS: CONTINUOUS EVOLUTION
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6 Sport / GT E-DIFF: TO IMPROVE AGILITY & STABILITY F1–TRAC: TO IMPROVE ON-LIMIT PERFORMANCE VEHICLE DYNAMICS: SIDE SLIP ANGLE CONTROL SSC SIDE SLIP ANGLE CONTROL A non-conventional algorithm estimates Side Slip Angle via signals available on the car. Information is used by:
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7 Sport / GT A real time SS angle enables us to manage the E-diff locking torque in a precise way in order to reach highest values of Agility Stability. E-Diff now is dependent on the driving style Understeer or oversteer are quickly identified E-diff locking torque is istantaneously modified to gain agility or stability E-Diff (SSC) AGILITY & STABILITY
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8 Sport / GT The E-diff locking torque (Power-off and steady state) changes in real time in function of SWA, AY and speed (as before) and vehicle side slip angle Measured Side Slip Angle <= TARGET the vehicle is in a stable situation the locking torque is reduced to increase agility If measured Side Slip Angle > TARGET the vehicle is approching the limit the locking torque is increased to gain stability E-Diff (SSC) HOW IT WORKS
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9 Sport / GT A steering wheel angle sweep Speed range:100-150 km/h Steering wheel angle+/- 20° deg Lateral acceleration:+/-0.5 g This manoeuvre represents very well what the drivers feel when he is driving on a twisty road but not on the limit. AGILITY: AN EXAMPLE E-Diff (SSC): AGILITY
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10 F430 430 Scuderia 458 Italia E-Diff (SSC): AGILITY & TIME RESPONSE Speed range:100-150 km/h SW angle+/- 20° deg Lateral acceleration:+/-0.5 g
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11 458 E-Diff logic Setup 1 Setup 2 Setup 3 E-Diff (SSC): AGILITY & TIME RESPONSE Speed r ange:100-150 km/h SW angle+/- 20° deg Lateral acceleration:+/-0.5 g F430 430 Scuderia 458 Italia
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12 458 E-Diff logic NEW E-Diff logic with SSC -14% -11% 458 Speciale E-Diff (SSC): AGILITY & TIME RESPONSE Speed range:100-150 km/h SW angle+/- 20° deg Lateral acceleration:+/-0.5 g F430 430 Scuderia 458 Italia +/- 1.0g
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13 Sport / GT a turn-in maneouvre executed in two different ways With a considerable amount of Side Slip Angle (-> OS) With a small amount of Side Slip Angle (-> US) E-Diff (SSC): DRIVING STYLE DRIVING STYLE: AN EXAMPLE
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14 LIMIT DRIVING WITH O/S Steering VEIHCLE PARAMETERS AND DRIVER DEMANDS Steering Brake Throttle LIMIT DRIVING WITH U/S E-Diff (SSC): DRIVING STYLE TURN-IN MANEOUVRE
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15 Steering VEIHCLE PARAMETERS AND DRIVER DEMANDS Steering Brake Throttle SIDE SLIP ANGLE MEASURED > TARGET MEASURED < TARGET E-Diff (SSC): DRIVING STYLE LIMIT DRIVING WITH O/SLIMIT DRIVING WITH U/S TURN-IN MANEOUVRE
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16 Steering VEIHCLE PARAMETERS AND DRIVER DEMANDS Steering Brake Throttle SIDE SLIP ANGLE E-Diff LOCKING TORQUE MEASURED > TARGET E-DIFF(SSC) > E-DIFF(458Italia) MEASURED < TARGET E-DIFF (SSC) << E- DIFF(458Italia) E-Diff (SSC): DRIVING STYLE LIMIT DRIVING WITH O/SLIMIT DRIVING WITH U/S TURN-IN MANEOUVRE
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17 Sport / GT A real-time knowledge of the SS Angle allows F1-Trac control to be greater giving: higher longitudinal acceleration higher lateral acceleration higher vehicle speed in a bend lower steering wheel angle activity F1-Trac (SSC) LIMIT PERFORMANCE
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18 Sport / GT The engine torque changes in real time in function of the vehicle Side Slip Angle If MEASURED SideSlipAngle <= TARGET the vehicle is in a stable situation no engine cut interventions are needed, longitudinal acceleration is maximized If MEASURED SideSlipAngle > TARGET : the vehicle is approching the limit some engine cut interventions are needed, SWA activity is minimized to easily manage the vehicle F1-Trac (SSC) HOW IT WORKS
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19 Sport / GT POWER ON GOING OUT OF A BEND a.F1-Trac without SSC b.F1-Trac with SSC LIMIT PERFORMANCE: AN EXAMPLE F1-Trac (SSC)
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20 Driver Engine Demand F1-Trac Engine Target Ax Target Wheel Slip Real Wheel Slip WHEEL SLIP ENGINE TORQUE LONGITUDINAL ACCELERATION SWA Target SSA Real SSA 458 Italia: F1Trac Activation Measured < Target 458 Speciale: F1Trac (SSC) OFF Reduced Ax Higher AX Measured > Target POWER ON OUT FROM A BEND (CToff Positon) F1-Trac (SSC): LIMIT PERFORMANCE
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21 Sport / GT RACECT off +12 % +70% Ax SWA -3% -30% RACE CT
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