DYNAMIC BALANCING OF TILTING VEHICLE

Guided by-Prof. S.C.FARGADE

Presented by -VINOD I. VERMA -SUHAS S. VYAVAHARE -SACHIN J. VAKHARE -SIDDHARTH S. MANIYAR

[B.E. Mechanical] AMRUTVAHINI COLLEGE OF ENGINEERING,SANGAMNER

INTRODUCTION Basic requirement of vehicle - to provide comfort as well as

safety .

But while cornering at high speed , it tilts causing discomfort and chances of accidents by rollover of vehicle .

Because of the centrifugal force acting on vehicle CG get displaced which leads to tilting of the vehicle in the opposite direction of cornering.

Hence to minimize this phenomenon.... Why we are not tilting it to opposite side...???

TILTING ? Tilting of the passenger cockpit with respect to Vertical plane along the Longitudinal axis of vehicle.

The cockpit tilted in the same direction of turning , keeping the chassis normal .

Because of this, CG get tilted canceling the shifting of weight which is produced due to the centrifugal force acting on it while high speed cornering.

DYNAMIC BALANCING!Tilting angle depends on

Driver intentionVelocity Curvature radiusRespective road bankingHazardous situation

Dynamic balancing system.

VARIOUS INGRATED SYSTEMS

ABS(ANTI-LOCK BRAKING SYSTEM)

TCS(TRACTION CONTROL SYSTEM)

ESP(ELECTRONIC STABILITY PROGRAM)

ESP

DBSDriver

Intension

Steering Angle

Level sensor

Hazardous Situation

Velocity

TiltingActuator

Lateral Acceleration

Yaw Rate

Steering angle velocity

Wheel speed

INTERVENTIONS OF ESP & DBS

ESP Monitoring – 25 times a sec Communication with driver Period of intervention

DBS steer angle velocity understeer oversteer off road maneuverabilities Period of intervention

ALTERNATIVES FOR TILTING

SPLITING OF CHASSIS

MODIFICATION IN EXISTING SUSPENSION

TILTING MECHANISMS BY POWER SCREW

BY USING PNEUMATIC ACTUATORS

BY USING HYDRAULIC ACTUATORS

BY USING ELECTROMECHANICAL ACTUATOR

BY STEPPER MOTOR

ANALYTICAL CONCLUSIONVs2 =gC(sinθ +µcosθ)/(cosθ + µsinθ)Vo

2 =gC(a cosθ +2h sinθ)/(2h cosθ – a sinθ)

µ=0.8 Θ =130

C=30m g=9.8m/s2

a=1.763m h=1.520m

Sliding velocity for non-tilting car =14.34m/s ( 51.624kmph ) Overturning velocity for the same =13.06m/s ( 47.03kmph )

Whereas for a tilting car that can tilt 13 degrees into the curve

Sliding velocity =16.002m/s =57.62kmph Overturning velocity =16.5m/s = 59.24 kmph

Increase in sliding velocity = 11.61475% Increase in overturning velocity =25.94%

ADVANTAGE This design improves flexibility.

Reduces risk of accident.

Provides Dynamic comfort.

Life span of tire increases.

FUTURE SCOPE… The car design in itself is futuristic and can be soon find in

some production versions of four-wheeled tilting cars.

A feature can be added to the existing suspension using a

minor programming change.

We can use this mechanism in heavy vehicles and trailors.

CONCLUSION.. Increase the threshold velocity of a Tilting car in a curve.

It help to balance the centrifugal force on vehicle.

ESP with rollover mitigation function helps the driver to stay on road and to avoid tripping obstacles by yaw control.

REFERENCES1] Thomas D. Gillespie “Fundamentals of Vehicle Dynamics”, Society of Automotive Engineers, Volume No.1.

2] Benjamin Drew, Kevin Edge, Matt Barker, Jos Darling & Geraint Owen “System Development for Hydraulic Tilt Actuation of a Tilting Narrow Vehicle”, The Ninth Scandinavian International Conference on Fluid Power, SICFP ’05, June 1-3, 2005, Linköping, Sweden.

3] D. Piyabongkarn, T. Keviczky and R. Rajamani “Active Direct Tilt Control For Stability Enhancement Of A Narrow Commuter Vehicle”, International Journal of Automotive Technology, Vol. 5, No. 2, pp. 77−88 (2004). 4] Hans Prem, Luan Mai, Lazslo (Les) Brusza “Tilt Testing Of Two Heavy VehiclesAnd Related Performance Issues”, Mechanical System Dynamics Pty Ltd. 5] E. K. Liebemann, K. Meder, J. Schuh, G. Nenninger “Safety and Performance Enhancement: The Bosch Electronic Stability Control (ESP)”, Robert Bosch GmbH Germany, Paper Number 05-0471. 6] Akihito kazato “A Tilt Control System Focused on Preventing Motion Seakness”,Railway Technology Avalanche No.38,March 21,2012.

THANK YOU…