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Zorluk: ZorCoasting and Vehicle Control

In a modern car fitted with electronic fuel injection, coasting in neutral or holding the clutch pedal fully depressed while decelerating consumes less fuel than remaining in gear with the accelerator fully released.

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False
The statement is false. Modern vehicles equipped with electronic fuel injection employ overrun fuel cut-off systems that halt fuel delivery whenever the vehicle is decelerating in gear with the accelerator released. By contrast, coasting in neutral or keeping the clutch disengaged forces the engine to burn fuel to maintain idle speed. Additionally, Highway Code Rule 122 emphasizes that coasting severely diminishes vehicle control by eliminating engine braking and reducing steering precision.

Adım Adım Çözüm

1
Examine fuel injection behaviour during overrun while remaining in gear.
When rolling in gear with the accelerator released above idle speed, the vehicle momentum turns the engine, allowing the engine control unit (ECU) to shut off fuel delivery entirely.
Kinetic energy keeps the engine rotating, resulting in zero fuel consumption during in-gear deceleration.
2
Evaluate the mechanical and fuelling conditions during coasting.
When coasting in neutral or with the clutch held down, the engine is disconnected from the driven wheels and must actively inject fuel to maintain its idle speed of roughly 700 to 900 RPM.
Without rotational drive from the wheels, active combustion is required to keep the engine running.
3
Assess vehicle stability and safety implications under Highway Code Rule 122.
Coasting eliminates engine braking, places excessive thermal load on the friction brakes, reduces steering responsiveness, and prevents prompt acceleration if a hazard develops.
Staying in an appropriate gear provides critical safety margins alongside optimal fuel efficiency.

Anahtar Kavram

Impact of coasting on fuel injection cutoff, engine braking, and vehicle control
Tahmini Süre:45s
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Coasting and Vehicle Control

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