Tiptronic

Hello.

"In my 1.9 TDI PD 85 kW with Tiptronic transmission, I'm annoyed that I can't shift manually into the next higher gear without exceeding 1,750 RPM."

Does it even make sense?

Can the software not be reprogrammed?

Best regards.

The purpose is to prevent the engine speed from dropping too low, which would cause the transmission to shift unnecessarily.

Sure.

But I mean, when I'm in manual mode, can I decide for myself when to switch it on?

Best regards.

If the engine speed threatens to become too low, the transmission prevents it to avoid stalling.


I have a tip for you. At least it works on our A6.

Increase the engine speed until you can shift gears, then let it drop below 1750 RPM. Then the transmission should upshift again at approximately 1400 RPM.

However, the thing is that when you have an automatic transmission, you have to make certain compromises in terms of control.

Surely, it must be possible to trick the software.

Sure, that's possible. However, this would require rewriting the control program, and I doubt that anyone in a regular workshop is capable of doing that, or would even want to.

The purpose of this minimum RPM for shifting is that, when driving at too low an RPM, the torque converter cannot be fully locked. The transmission requires pressure from the oil pump to achieve this, and the pump only provides pressure at a corresponding RPM. It could even lead to slippage in the clutch if the torque demand is too high at a low RPM. Furthermore, it's illogical because, when the torque converter is open, the efficiency loss within the converter is significantly higher than the fuel savings you can achieve by shifting to a higher gear. You're likely more efficient driving with a slightly higher RPM but with the torque converter locked. By the way, what kind of vehicle is it, exactly?
Regards,
Nessie.

Hi,

Oil pressure this, oil pressure that... For me, it's not really state-of-the-art when you can't use a Tiptronic (which suggests that the driver can shift gears themselves) in a way that allows you to drive below 1750 RPM. "Risk of stalling" is understandable, but 1750? Wouldn't 1000 have been enough? And even that... my ASV (Automatic Speed Limiter) wouldn't let the car come to a complete stop in any gear without acceleration; it would just maintain a low idle speed. Therefore, it would be possible to allow the WK (presumably referring to a specific program or system) to continue indefinitely, and likely save a considerable amount of money in the process.

A colleague with a TDI engine and DSG transmission is experiencing a similar problem... he's also not able to achieve the same fuel efficiency as would be ideal for a TDI (something around 1500 miles seems to be the limit)... and there are no warning lights indicating any issues.

I'm just wondering if there's some deliberate intention behind it, or if Volkswagen has shares in certain oil companies.

Best regards,

Jan.

Multitronic driving

The A6 V6 TDI with Multitronic, which I've had the pleasure of driving before, was much "nicer" in comparison.

Gently on the pedal, and the needle never exceeded 1500 rpm, at least until the highest gear was reached (which was approximately 90 km/h). That was then a nice glide... but that often happened to me in the city .

In Tip mode and with the accelerator fully pressed, he only dared to "lecture" me and shift into the next gear at 4200 RPM.

m;

Doesn't the Multitronik operate on a completely different principle? Doesn't it have fixed "belt positions" per gear, defined electronically, rather than actual gears? You hardly need any "transformation" for that.

Okay, please provide the German text you would like me to translate into English. I will only provide the translation.
Why does the manual shift function actually exist in Multitronic? Shouldn't it be replaced by a better and "fully" variable transmission? Is this a combination of something modern and appealing to "old-fashioned" customers, along with something more conventional?

How do you plan to get the vehicle moving without a transmission or clutch? Of course, something like that isn't needed in a Multitronic to change the gear ratio. The fixed gear levels for the steering wheel buttons or the gear lever are intended to give the driver a more sporty feel. Furthermore, they can be developed for just 20 cents and can be sold at a significantly higher price.

So:

The Multitronic (with a "C" at the rear ) has no gears and an electronically controlled clutch, and it does not have a torque converter.

The selectable gears are invaluable when driving in the city. Otherwise, you would only be able to slow down the tractor using the foot brake. And that's annoying, and it would cost an endless amount of money for proof.

I accelerate him, and if the road continues like this, he'll speed up again in the fast lane until I let him slow down in the Tiptronic lane at the next traffic light. It's a way to get the same result as using a switch, but with less complexity.

m;

dieselmartin wrote:

So: The Multitronic (with a "C" at the rear ) has no gears and an electronically controlled clutch, and it does not have a torque converter.

hihi, I'm used to everything being written with a "K" in Germany, even things that I know with a "C" . Also, they write it completely wrong in Germany; it's called VARIOMATIC (Daf) .

dieselmartin wrote:

The selectable gears are invaluable when driving in the city. Otherwise, you would only be able to slow down the tractor using the foot brake. And that's annoying, and it would cost an endless amount of money for proof. I accelerate him, and if the road continues like this, he'll speed up again in the fast lane until I let him slow down in the Tiptronic lane at the next traffic light. It's a way to get the same result as using a switch, but with less complexity.

Well, then it would soon consume at least half as much energy as with a regular switch. If I had one, I would only use it in fully automatic mode, even with the brake pads engaged. I've driven one before, and it didn't seem particularly sporty to me, although I'm not driving a diesel either.

I wrote that you hardly need any (or less) gear shifting (i.e., an electronically controlled clutch), and therefore you can drive at a lower RPM compared to a conventional automatic transmission (or with C? ).

The speed is only limited by the maximum design specifications.

The A6 engine rotates at 3000 RPM when traveling at 180 km/h. When going uphill, and the cruise control is activated, it gently increases to 3200 RPM – something you can't achieve with a simple switch.

The fact that "tiptronic" is spelled with a "p" and a "c" is not due to "German," but rather to "Audi," because they came up with the name .

m;

dieselmartin wrote:

The fact that "tiptronic" is spelled with a "p" and a "c" is not due to "German," but rather to "Audi," because they came up with the name . m;

"...even Porsche calls it that and writes it that way... Neologisms and modern German... that's what advertising thrives on!"

Hello, here's a brief explanation of the technology:

Currently, all multi-speed automatic transmissions with planetary gear sets use a torque converter. This provides the most comfortable starting experience currently possible from a technical standpoint. However, torque converters have very high hydraulic losses, which is why these transmissions have used so-called torque converter lock-up clutches for about 20 years. These clutches mechanically lock the torque converter. However, this requires sufficient pressure from the oil pump integrated into the transmission, and the pump's speed is dependent on the engine speed. The minimum engine speed required to fully engage the lock-up clutch depends on the specific transmission installed. For several years, VW has been installing Aisin transmissions in its front-wheel-drive vehicles.

In Audi vehicles with a front-longitudinal drivetrain, a CVT (continuously variable transmission) is installed when only front-wheel drive is used. These transmissions (developed by Audi in collaboration with LUK) use a clutch that operates in an oil bath as a starting element. The control system is quite complex and does not work equally well in all transmissions. Some are excellent, while others are not as good. The Quattro all-wheel-drive system uses planetary gearboxes from ZF. Because the Multitronic transmission was not originally developed for all-wheel drive, torque converters are used as the starting element in those systems.

Normally, the driving assistance functions for the driver are only restricted if there is a risk that "misoperation" could damage the transmission or the engine. Therefore, it is likely that the problem lies with the powertrain if the shifting function is locked. If the engine speed is too low, either the engine will stall, or the transmission will be unable to function properly.

Regards,
Nessie.