When driving a commercial motor vehicle equipped with an unsynchronized manual transmission, double clutching is required to change gears smoothly. In what order should a driver perform the basic actions of an upshift? Arrange the following steps in the correct chronological sequence from start to finish.
- 1Release the accelerator, press down the clutch pedal, and shift into neutral.
- 2Release the clutch pedal to let the engine and transmission gears slow down to the required speed.
- 3Press down the clutch pedal again and move the shift lever into the next higher gear.
- 4Release the clutch pedal smoothly and press down on the accelerator.
Cevap
The correct sequence begins with releasing the accelerator, depressing the clutch, and shifting into neutral; followed by releasing the clutch in neutral to let engine RPM drop; then depressing the clutch again to shift into the higher gear; and finally releasing the clutch while applying the accelerator.
A double-clutch upshift requires two distinct clutch engagements: first disengaging the current gear to neutral, releasing the clutch so engine and transmission shaft RPM drop to match the higher gear's ratio, depressing the clutch again to slip into the higher gear, and finally releasing the clutch while applying throttle to resume acceleration.
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Double clutching upshift sequence for unsynchronized manual transmissions
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