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Zorluk: OrtaSkid Control and Recovery

A commercial motor vehicle driver transitions onto a frost-covered bridge deck and notices that the drive wheels have suddenly lost traction and begun sliding due to engine retarder braking. Which action should the driver take immediately to recover from this skid?

  1. A
    Apply firm, steady service brake pressure to lock all wheels and force the vehicle to slide in a straight line.
  2. Turn off the engine retarder immediately and steer in the direction the rear of the vehicle is skidding.Cevap
  3. C
    Steer sharply away from the direction of the skid while maintaining retarder engagement.
  4. D
    Increase the retarder setting to maximum to stop wheel rotation before the vehicle exits the bridge deck.

Cevap

Turn off the engine retarder immediately and steer in the direction the rear of the vehicle is skidding.
When an auxiliary retarder causes a drive-wheel skid on a low-traction surface such as bridge frost, the driver must instantly switch off the retarder to remove braking torque from the drive axle. This allows the wheels to turn freely, restoring rolling traction so the driver can steer in the direction the rear of the vehicle is skidding to regain directional control.

Adım Adım Çözüm

1
Identify the cause of traction loss as drive-wheel braking drag from the retarder on a slippery surface.
Recognizes that the drive wheels are skidding because auxiliary braking force exceeds available tire-road friction.
Retarders apply continuous braking force to drive axles, which easily breaks tire adhesion on wet, icy, or frosted roads.
2
Disengage the retarder immediately without applying service brakes.
Removes the braking torque from the drive wheels so they can spin up to road speed.
Drive wheels must be rolling freely to generate the lateral traction necessary for directional control.
3
Counter-steer smoothly in the direction the rear of the vehicle is sliding, then center the wheel as the vehicle straightens.
Brings the front and rear of the vehicle back into alignment without triggering a secondary skid.
Steering in the direction of the rear skid aligns the steer tires with the sliding path to catch and arrest the swing.

Anahtar Kavram

Drive-wheel skid recovery and retarder disengagement on low-traction surfaces
Tahmini Süre:1m 0s
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Konular

Skid Control and Recovery

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