The Q7 (eight-speed) automatic speed control is a complete disaster.
In any small slope the car exceeds the speed excessively.
This video represents the performance of automatic speed control. I was scheduled 105km / h. Why not change automatically from D8 to D7, D6,,,?


The speed is much higher than the programmed; fuel consumption is 0L/Km and incomprehensibly does not change anything.
It is a serious problem that Audi does not want to solve

If your car has this behavior, make a complaint at:

service@audi.de

They will propose you to make it up with something, but do not give in, demands to solve the problem.
They just need to modify the automatic gear box software. And in the same way that it use automatically the gear box, when going up (needs more power), it must also use automatically the gear box when it goes down (need more engine braking).

 

You can prove it in a easier way by setting a speed of 100 km/h. By setting a higher speed, for instance 140km/h, few slopes will make the car to increase its speed. By setting 100km/h , as the car will use gear D8, this speed will be increased even by a smooth slope.

 

It seems that you like to be like Fernando Alonso, who nobody cares malfunctioning speed control.
It is important to note that the car should not have the ACC option. With this extra option, the car brakes.
I want to encourage other users, to do the test to check if they are agreed.
If so, I think they should make it known manufacturer.
service@audi.de

 

Not sure what your complaint is completley. If the vehicle is coasting down a slope, it very well could speed up. It shows OL/KM because the throttle is closed so it isn't calculating economy at that time. The tech can't fix a normal condition if that's what you mean by "Audi won't do anything about it". Sounds like the speed control like it's supposed to from your description. Why they don't have the trans downshift to maintain set speed comes down to one thing,,,,,,,,,,,,,,,,,fuel economy and trying to get every 1/10th they can to avoid gas guzzler taxes and other things like that.

 

Hello aspen79.
I do not understand so much which are your doubts, but I'll try to give an example to make clear what the behavior of the car, and which is the proposal to avoid the problem with the cruise control.
The car has no ACC option. This option uses the brakes automatically to "adapt speed."
We are talking about the "cruise control" (CC), which should "keep constant" the speed.
The problem is that , under certain conditions, it does not. This is a big problem in the models with a eight-speed gearbox .
Suppose we are driving through a road limited to 100km / h. We program a speed 100K / h in the tempomat . The car kept speed constant of 100km / h, even in strong upslope, as it will reduce automatically to D7, D6 ...
Suppose we approach a downslope, with a drop of 5%. At first the car is using the eighth-speed (D8) and begins to decrease fuel consumption and still keeping the speed of 100km / h. The downslope has a length of more than 400m.
The car still uses the eighth-speed (D8) and continues to decrease fuel consumption, and still keeping the speed of 100km / h. The car continues down the slope of 5%, decreases fuel consumption to a minimum (0L/Km) and, just in these moment, it still maintains the 100km / h. From there the car fails to maintain 100km / h, will soon reach 110Km /h, still consuming 0L/k and CONTINUES in the eighth-speed (D8). It hold this configuration and the speed continues increasing, 115km / h ... 120km / h ... 125km / h ...

What about 100km / h scheduled?

The proposal I make, is that the car, when exceeding the set speed, and consumption is 0L / K, should automatically change from D8 to D7. In this downslope (of 5%) still increasing the speed and the fuel consumption still in 0L / K, so it should automatically change to D6. On this downslope the car will need to switch to the D5 to maintain speed below 105Km/h and remain with fuel consumption in 0L/Km. Thus, not increase the set speed dangerously, it continue the fuel consumption in 0L/Km, and it will recharge the battery (downslope, 0L/K and D5).
What is the problem?
Why Audi does not solve this failure?

 

Stop Excuses, give me solutions.

excuses to malfunction:

…it was first fitted in the middle of the last century
the user manual
the options,
the downhills,
the others models,
only controls the engine throttle/fuelling,
the competitors,
the weightof the car,
and flying birds.

And I think they forget tow more very important: downwind and passengers on board.

¡If you imagined what we’re not receiving because we are not asking it, you would surely change your behaviour!