PRESENTED By
CH.PRAVEEN KUMAR

---

[attachment=10514]
Vehicle skid can be defined as the loss of traction between vehicle’s tyres and the road surface due to the forces acting on the vehicle.
.Skids can occur both in the dry and wet as well as icy conditions, however, the chances of losing control and having an accident increases by 50% in the wet.
CAUSES:-
The main causes of skidding are as follows:
 Harsh or sudden acceleration.
 Excessive or sudden braking.
 Coarse or jerky steering movements.
 Oversteer and understeer.
Types of SKID:-
• The front wheel skid
• The rear wheel skid
• The four wheel skid
The Front Wheel Skid :-
Characteristics-
The car tends to take a course outside of the expected course that the driver has steered (understeer).
Cause-
Excess speed on entry to a hazard i.e. a corner or bend, or sudden braking to reduce the speed when negotiating the hazard.
The Rear Wheel Skid
Characteristics:-
1.The rear of vehicle swings out of line and gives the impression of trying to overtake the front (oversteer)
2.If the rear tyres approach their traction limit more rapidly than the front, then the effect is for the rear of the car to steer a wider path than the front wheels.
Four Wheel Skid-
Understeer AND OVERSTEER- Understeer occurs when the front slip angle is greater than the rear and the car goes straighter rather than intended turn.
Oversteer occurs when the rear tyres have a greater slip angle than the front tyres and the back threatens to overtake
the front, causing the vehicle to spin.
SKID CONTROL-
 Stability control systems or skid control systems with names like StabiliTrak, Dynamic Stability Control, Stability Management, and Vehicle Skid Control are the latest advancement in vehicle safety
 Vehicle Skid Control (VSC) takes the safety aspects of the driver and the vehicle to a completely new level
Components-
The Vehicle Skid Control (VSC) is made possible by the combination of different electronic and mechanical components
 Yaw rate sensor.
 G-sensor.
 Steering angle sensor.
 Electronic throttle control.
 Slip indicator.
 Computer.
Remedial Measures-
1.By decelerating, the vehicle’s speed is lowered, which in turn will start to reduce the magnitude of the skid.
2. Relaxation of the pressure on the brake pedal will unlock the wheels and allow the tyres to regain traction,enabling the vehicle to be steered.
Advantages –
1.Monitors each wheel independently maximizing the performance of the car.
2. Increases comfort, both physical and psychological
3.Enhances the ability to dodge a renegade object in its pathways.
Disadvantages:-
 High initial costs.
 Overdependence.
 Not perfect.
 Repairing cost may be high
Conclusion-
 Automotive technology is being developed everyday to make our lives on the roads much safer. Vehicle Skid Control is one such instance. Safety is the principal benefit of this technology.
 With increasing development in the field of automobiles, it is only imperative that we go for vehicles that have these technologies installed in them. Vehicle Skid Control would not, in anyway eliminate all road accidents; however it would lower the percentage of crashes thereby lowering the number of fatalities.