TATA 1210 engine sound and Double clutch (technique) full review | 1992 MyIndian tata truck

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The Indian Tata Model 1210 1992 Indian Model TATA 1210 pure engine sound and dual-clutch transmission (DCT) system review
Double clutch (technique)
Double-clutching (also called double de-clutching in countries outside of the United States) is a method of shifting gears used primarily for vehicles with an unsynchronized manual transmission, such as commercial trucks and specialty vehicles. While double clutching is not necessary in a vehicle that has a synchronized manual transmission, the technique can be advantageous for smoothly downshifting in order to accelerate, and when done correctly it prevents wear on the "synchros" which normally equalize transmission input and output speeds to allow downshifting.
With this method, instead of pushing the clutch in once and shifting directly to another gear, the driver first engages the transmission in neutral before shifting to the next gear. The clutch is depressed and released with each change.[1] A related downshifting/rev-matching technique is heel-and-toe shifting, in which the throttle is blipped (i.e. momentarily opened while engaged in downshifting) by the driver's heel. The driver's toes will accomplish the braking as the clutch is depressed, causing the engine speed to rise and closely match the transmission speed enabling smooth performance downshifts. These two techniques can be combined, e.g. using the "toe" to brake to slow the car while entering a corner, while using the heel to press the throttle pedal for the double-clutch technique. In this manner, one may downshift and brake at the same time, and be ready to accelerate again once the corner is completed.
A dual-clutch transmission (DCT) (sometimes referred to as a twin-clutch transmission) is a type of multi-speed vehicle transmission system, that uses two separate clutches for odd and even gear sets.[1] The design is often similar to two separate manual transmissions with their respective clutches contained within one housing, and working as one unit
Technique
The double-clutching technique involves the following steps:
The accelerator (throttle) is released, the clutch pedal is pressed, and the gearbox is shifted into neutral.The clutch pedal is then released, the driver matches the engine speed to the gear speed either using the throttle (accelerator) (when changing to a lower gear) or waiting for engine speed to decrease (when changing to a higher gear) until they are at a level suitable for shifting into the next gear (although double clutching is almost always used for downshifting only).At the moment when the revs between the input shaft (i.e. engine revs) and gear are closely matched, the driver then presses the clutch again and shifts into the next gear. The result should be a very smooth gear change.
Although double clutching is a testing requirement when obtaining a commercial driver's license, most experienced truckers learn to shift gears without using the clutch. This is known as floating gears or float shifting, with the clutch needed only during starting and stopping.
Sometimes, truck drivers use the engine brake to help match the engine speed to the gear. The most common situation is with a loaded vehicle which has no split gears or half gears in the lower range, from gears 1-4. In this case, it is especially difficult and sometimes impossible to get from 1 to 2, and sometimes even from 2 to 3 while starting on a hill. The problem is that by the time the engine speed has dropped sufficiently to enable a shift into the higher gear, the vehicle will have slowed down too much or possibly even stopped, making the shift impossible. The engine brakes, which on some models can be set to different intensities (retarding variable numbers of engine cylinders) enable a shift by dropping the engine speed quickly enough to catch the higher gear before the vehicle has decelerated too much. This technique, sometimes called "jake shifting", requires high skill and much practice shifting without the clutch, and is usually not recommended among truck drivers because mistakes can cause damage to the transmission. Some authorities prohibit jake shifting.
Source WIKIpedia
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