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MEGAMATIC AGAINST EPS

Structurally taking criticism *, the Avtoprivod company finalized the Megamatic automatic clutch.

Alexey VOROBYEV-OBUKHOV

The main disadvantage of electromagnetic clutch for the Oka, noted by us, is strong jerks when switching to engine braking mode. And so the representative of Serpukhov's "Autoprivod" proposed to try out a new version of "Megamatic." Several months of hard work benefited - along with a change in the algorithm of work, we managed to triple (!) Reduce the current consumed by the electromagnet while maintaining traction. Now, only 5 A is enough to turn off the clutch. Well, outwardly, changes became noticeable on the gear shift knob: a special sensor appeared on it (as in the electrovacuum clutch drive - EPS). True, it is structurally executed in a different way: the button for turning on the reverse lights is used - cheap and reliable, although not too beautiful. Now, the Megamatic electronic brains receive the same set of signals as the EPS: engine speed, throttle position and driver’s hands on the gear lever. The easiest way would probably be to copy the well-established algorithm of a competing system. But in the "Auto Drive" they approached the matter creatively and therefore the difference is noticeable in the work of these two machines.

First of all, we note that engine braking is no longer a problem - you just need to remove the gas. When the rpm drops to about 1000 rpm, the clutch will shut off. BUT ONLY IF YOU HAVE FULLY RELEASED THE GAS PEDAL. The EPS algorithm does not have this requirement and therefore it is simply impossible to accidentally shut off the engine. Here, if you try to make the car go in the wrong gear, when it does not have enough strength, the motor will stop.

The second difference follows from the first: to change gear, it’s not enough just to put your hand on the lever - you still have to completely release the gas pedal. What does it give? On the one hand, relocation and “twisting” of the engine are excluded - this is good. On the other hand, a smooth continuation of the movement requires precisely calculated operation by the accelerator pedal: the clutch should engage at the moment when the speed of its discs is aligned. In general, Megamatic does not delay the clutch slip phase, which, without a doubt, will have a beneficial effect on the wear of the linings. Perhaps it will be even smaller than when riding with a conventional clutch. But, we repeat, we need to practice so that the machine turns on the clutch without jerks.

The new Megamatic will make it possible to slowly and slowly crawl when parking, but the engine speed range, in which the clutch is not fully engaged, is narrower than in the electrovacuum system and, therefore, the right leg will again need some skill.

What conclusions can be drawn from a comparison of the two systems? In our opinion, EPS is more suitable for very inexperienced drivers, because it forgives almost any mistakes, up to the wrong choice of transmission. Price - the clutch disc does not live long. "Megamatic" requires a certain driving culture, but for this it promises to preserve the "iron". In both systems, the release bearing is subjected to increased load, because idle clutch is always squeezed. Now, if there was still a sensor of the included "neutral" …

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