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Difficulty: MediumABS and Electronic Stability

Match each vehicle handling situation or loss-of-control scenario with the specific electronic safety system intervention that corrects it.

  • Understeer where the vehicle pushes wide towards the outside of a bendSelectively applies braking to individual wheels to correct rotational yaw and align the car with steering input
  • Heavy emergency braking threatening to lock wheels and eliminate steering controlRapidly pulses hydraulic pressure to prevent wheels seizing, allowing the driver to steer while braking
  • Drive wheels spinning and losing grip during acceleration on a slippery slopeReduces engine torque and applies brake resistance to slipping drive wheels to restore grip
  • Driver depressing the brake pedal quickly in an emergency but without sufficient forceDetects the speed of pedal movement and automatically applies maximum braking effort to minimise stopping distance

Answer

Understeer on a bend is corrected by selectively braking individual wheels to align yaw (ESC); emergency brake wheel lockup is prevented by rapidly pulsing hydraulic pressure to retain steering (ABS); acceleration wheelspin is managed by reducing torque and braking spinning wheels (TCS); and insufficient pedal force during sudden stops is resolved by automatically boosting brake effort to maximum (EBA).
Each active safety system manages a specific handling dynamic: Electronic Stability Control (ESC) prevents yaw divergence during cornering by braking individual wheels; the Anti-lock Braking System (ABS) prevents wheel seizure under harsh braking to preserve steering control; Traction Control (TCS) mitigates driven wheelspin during acceleration; and Emergency Brake Assist (EBA) boosts hydraulic braking pressure to maximum when rapid panic braking is detected.

Step-by-Step Solution

1
Analyse the cornering instability scenario where the car pushes wide (understeer).
Pair with the system that provides selective individual wheel braking to control yaw (ESC).
Electronic Stability Control is designed to correct directional stability and yaw deviations.
2
Analyse the severe deceleration scenario threatening wheel lockup and loss of steering.
Pair with the system that pulses brake pressure to maintain wheel rotation (ABS).
ABS prevents lockup so lateral tyre grip is maintained for steering during emergency stops.
3
Analyse the acceleration scenario where driven wheels spin on a slippery surface.
Pair with the system that curbs engine power and brakes slipping wheels (TCS).
Traction control manages driven wheel slip under throttle input.
4
Analyse the emergency scenario where pedal application is rapid but lacks full mechanical force.
Pair with the system that detects rapid pedal movement and automatically applies maximum pressure (EBA).
Emergency Brake Assist overcomes driver hesitation to achieve shortest possible stopping distance.

Key Concept

Active safety systems (ABS, ESC, TCS, and EBA) address distinct vehicle dynamics: wheel lockup under braking, yaw/directional skids in cornering, wheelspin during acceleration, and inadequate pedal pressure during emergency stops.
Estimated Time:1m 0s
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Topics

ABS and Electronic Stability

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