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Vehicle skid control

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vehicle skid control to save lifes with accidents

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Vehicle skid control

  1. 1. VEHICLE SKIDVEHICLE SKID CONTROLCONTROL PRESENTED BY:PRESENTED BY: MOAYANGER JAMIR.MOAYANGER JAMIR. S7 MECH. ENGG.S7 MECH. ENGG. ROLL NO.32ROLL NO.32
  2. 2. INTRODUCTIONINTRODUCTION  Vehicle skid - The loss of tractionVehicle skid - The loss of traction between a vehicle’s tyres and the roadbetween a vehicle’s tyres and the road surface.surface.  VSC - Passive Technology.VSC - Passive Technology.  VSC - To counter skids and preventVSC - To counter skids and prevent accidents.accidents.
  3. 3. CAUSESCAUSES  Harsh or sudden acceleration.Harsh or sudden acceleration.  Excessive or sudden braking.Excessive or sudden braking.  Coarse or jerky steering movements.Coarse or jerky steering movements.  Oversteer and understeer.Oversteer and understeer.
  4. 4. UNDERSTEERUNDERSTEER When a car understeers, the front end ofWhen a car understeers, the front end of the car slides to the outside of a turnthe car slides to the outside of a turn instead of taking the turn. Understeerinstead of taking the turn. Understeer occurs when the rear tyres have moreoccurs when the rear tyres have more traction than the front tyres, which oftentraction than the front tyres, which often happens with frontwheel drive cars.happens with frontwheel drive cars.
  5. 5. OVERSTEEROVERSTEER A car that oversteers turns very sharply,A car that oversteers turns very sharply, moving the rear of the car to slide outsidemoving the rear of the car to slide outside of a corner while its front points towardsof a corner while its front points towards the inside. Oversteer occurs when a car’sthe inside. Oversteer occurs when a car’s front tyres have more traction than thefront tyres have more traction than the rear tyres, particularly with rear wheelrear tyres, particularly with rear wheel drive cars.drive cars.
  6. 6. TYPES OF SKIDSTYPES OF SKIDS  The front wheel skid.The front wheel skid.  The rear wheel skid.The rear wheel skid.  The four wheel skidThe four wheel skid
  7. 7. FRONT WHEEL SKIDFRONT WHEEL SKID  The car tends to take a course outside of theThe car tends to take a course outside of the expected course that the driver has steeredexpected course that the driver has steered (understeer).(understeer).  Understeer occurs when the front slip angle isUndersteer occurs when the front slip angle is greater than the rear and the car goes straightergreater than the rear and the car goes straighter rather than following the intended turn.rather than following the intended turn.  Excess speed on entry to a hazard i.e. a corner orExcess speed on entry to a hazard i.e. a corner or bend, or sudden braking to reduce the speed whenbend, or sudden braking to reduce the speed when negotiating the hazard. Both of these actions willnegotiating the hazard. Both of these actions will have the effect of destabilizing the vehicle making ithave the effect of destabilizing the vehicle making it more vulnerable to a loss of controlmore vulnerable to a loss of control..
  8. 8. REAR WHEEL SKIDREAR WHEEL SKID  The rear of vehicle swings out of line andThe rear of vehicle swings out of line and gives the impression of trying to overtake thegives the impression of trying to overtake the front (oversteer).front (oversteer).  Oversteer occurs when the rear tyres have aOversteer occurs when the rear tyres have a greater slip angle than the front tyres and thegreater slip angle than the front tyres and the back threatens to overtake the front, causingback threatens to overtake the front, causing the vehicle to spin.the vehicle to spin.  Excessive speed into the hazard and suddenExcessive speed into the hazard and sudden braking or acceleration with a rear wheelbraking or acceleration with a rear wheel drive vehicle, destabilizing the vehicle, aredrive vehicle, destabilizing the vehicle, are the main causes of this skid.the main causes of this skid.
  9. 9. FOUR WHEEL SKIDFOUR WHEEL SKID  All four wheels have locked up and theAll four wheels have locked up and the vehicle is sliding in the direction that thevehicle is sliding in the direction that the forward momentum is carrying it, with noforward momentum is carrying it, with no directional control.directional control.  Both front and rear wheel skids, if uncheckedBoth front and rear wheel skids, if unchecked sufficiently early, can develop into four wheelsufficiently early, can develop into four wheel skids.skids.  Harsh or sudden braking causing the wheelsHarsh or sudden braking causing the wheels to lock and a sensation of increase in theto lock and a sensation of increase in the vehicle’s speed are the main causes.vehicle’s speed are the main causes.
  10. 10. SKID CONTROLSKID CONTROL  To sense the onset of traction loss and keepTo sense the onset of traction loss and keep the driver on track.the driver on track.  To deliver transparent intervention theTo deliver transparent intervention the moment the situation becomes unstable.moment the situation becomes unstable.  Integrated with the engine managementIntegrated with the engine management system to cut power even in tricky situations.system to cut power even in tricky situations.  The system automatically applies selectiveThe system automatically applies selective braking to specific wheels to stabilize thebraking to specific wheels to stabilize the vehicle.vehicle.
  11. 11. SKID CONTROL
  12. 12. COMPONENTSCOMPONENTS  Yaw rate sensor.Yaw rate sensor.  G-sensor.G-sensor.  Steering angle sensor.Steering angle sensor.  Electronic throttle control.Electronic throttle control.  Slip indicator.Slip indicator.  Computer.Computer.
  13. 13. WORKINGWORKING  It monitors information from the steeringIt monitors information from the steering wheel, tyres, brakes and accelerator.wheel, tyres, brakes and accelerator.  By combining datas from the variousBy combining datas from the various sensors, the central processing unit cansensors, the central processing unit can detect when a vehicle is in a stable ordetect when a vehicle is in a stable or unstable state.unstable state.  Automatically applies light brake pressure toAutomatically applies light brake pressure to a select wheel (or wheels) and control thea select wheel (or wheels) and control the throttle to maintain or restore control.throttle to maintain or restore control.
  14. 14. ADVANTAGESADVANTAGES  Monitors each wheel independentlyMonitors each wheel independently maximizing the performance of the car tomaximizing the performance of the car to optimize the cars handling ability.optimize the cars handling ability.  Increases comfort, both physical andIncreases comfort, both physical and psychological.psychological.  Improves safety aspects of the car and theImproves safety aspects of the car and the driver.driver.  Helps save money long term.Helps save money long term.  Enhances the ability to dodge a renegadeEnhances the ability to dodge a renegade object in its pathwaysobject in its pathways..
  15. 15. DISADVANTAGESDISADVANTAGES  High initial costs.High initial costs.  Overdependence.Overdependence.  Not perfect.Not perfect.  Repairing cost may be high.Repairing cost may be high.
  16. 16. REMEDIAL MEASURESREMEDIAL MEASURES  By decelerating.By decelerating.  Relaxation of the pressure on the brakeRelaxation of the pressure on the brake pedal.pedal.  Depressing the clutch pedal.Depressing the clutch pedal.
  17. 17. CONCLUSIONCONCLUSION  Safety is the principal benefit of Vehicle SkidSafety is the principal benefit of Vehicle Skid Control.Control.  It does not guarantee the elimination ofIt does not guarantee the elimination of accidents but lowers the percentage ofaccidents but lowers the percentage of crashes thereby lowering the number ofcrashes thereby lowering the number of fatalities.fatalities.  The latest generation of stability controlThe latest generation of stability control systems offer drivers increased protection forsystems offer drivers increased protection for both themselves and the vehicle, they canboth themselves and the vehicle, they can never overcome poor judgements or the lawsnever overcome poor judgements or the laws of physics.of physics.

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