After departing a logistics terminal, you reach the target engine RPM in third gear and prepare to upshift into fourth gear using an unsynchronized manual transmission. In what exact sequence must you perform the steps of a standard double-clutch upshift?
- 1Release the accelerator pedal and depress the clutch pedal simultaneously.
- 2Move the gear shift lever out of the current gear into neutral.
- 3Release the clutch pedal completely to allow engine and input shaft RPM to fall to the required speed.
- 4Depress the clutch pedal again and move the gear shift lever into the next higher gear.
- 5Release the clutch pedal smoothly while reapplying pressure to the accelerator pedal.
Cevap
The correct chronological sequence for a double-clutch upshift is: (1) Release the accelerator pedal and depress the clutch pedal simultaneously, (2) Move the gear shift lever out of the current gear into neutral, (3) Release the clutch pedal completely to allow engine and input shaft RPM to fall to the required speed, (4) Depress the clutch pedal again and move the gear shift lever into the next higher gear, and (5) Release the clutch pedal smoothly while reapplying pressure to the accelerator pedal.
Executing a proper upshift in a commercial vehicle equipped with an unsynchronized manual transmission requires double clutching in a precise five-step sequence. First, the driver cuts throttle and depresses the clutch to pull out of gear. Second, the lever is moved into neutral. Third, the clutch is released while in neutral so the transmission input shaft can slow down along with the decelerating engine to reach the lower RPM required by the higher gear. Fourth, the clutch is depressed again to allow the lever to engage the higher gear. Fifth, the clutch is released as throttle is applied to resume driving power.
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Standard 5-step double-clutch upshifting procedure for unsynchronized heavy vehicle manual transmissions
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