The speed limiter becomes fuel saver

[PITMIX]

Bonjour.
By using the speed limiter of my van and displaying the instantaneous consumption on the dashboard, I had fun not exceeding 10l / 100km. Very difficult because you also have to watch the road.
I wondered why the fuel economy option is not in the catalog of options for our new cars? It's fashionable I think it would sell well.
The idea would be to limit the injection by setting as setpoint a maximum instantaneous consumption not to be exceeded instead of a speed.
I have read other posts alluding to this idea.
https://www.econologie.com/forums/regulateur ... t1266.html

Have electronics pros like nlc and Muzo 31 tested?
The time of the little red light that lights up when you have to change gear is over, you will have to switch to an active system.

[Grandaddy]

The most important thing is to find a way to reduce consumption without the solution having too much impact on the concentration of conductors.
I have read several times that regulators and limiters can reduce the attention span of people behind the wheel. Personally I do not prefer to use a regulator because after 30 minutes of driving at the same speed without doing anything I fear effectively not to be concentrated anymore (already that concentration is not necessarily my strong point ...).

I am not a car pro (far from it) but suddenly if I understand correctly the fuel saver would not set a speed limit? So how does he ensure that the car does not exceed the "maximum consumption not to be exceeded"?

[Gaston]

A power limiter, in a way

In my opinion, nothing technically difficult.

It remains to be seen whether the result obtained would meet expectations.

I am thinking above all of the interactions between the engine performance ranges and the gearbox.
For example, when starting off on a good hill, the limiter may prevent the car from being thrown into 3rd gear and would require staying in 2nd gear, with ultimately higher consumption.

[PITMIX]

For granddaddy it's an idea! The speed limiter does not work like a cruise control; it reduces injection when the vehicle approaches the set speed. Driving remains normal. You shift gears and accelerate and brake as usual except that you never exceed the programmed speed. You just need to press your foot on the floor to pass the notch on the pedal like the kick down on the automatic boxes to bypass the limiter (without it being deactivated).
It is much less disturbing than a regulator.
Here the principle would remain the same it's just that it would take into account an instant consumption instead of a speed. For gaston yes I wonder what would be the behavior of the vehicle. May be too uncomfortable to use

[Grandaddy]

Ce forum seems to be overrun by Gaston Lagaffe fans ... finally.

For granddaddy it's an idea! The speed limiter does not work like a cruise control; it reduces injection when the vehicle approaches the set speed. Driving remains normal. You shift gears and accelerate and brake as usual except that you never exceed the programmed speed. You just need to press your foot on the floor to pass the notch on the pedal like the kick down on the automatic boxes to bypass the limiter (without it being deactivated).
It is much less disturbing than a regulator.
Here the principle would remain the same it's just that it would take into account an instant consumption instead of a speed. For gaston yes I wonder what would be the behavior of the vehicle. May be too uncomfortable to use

Okay, thanks for the clarification But not being a specialist (as I said before) I find it hard to realize the feasibility of the thing.

[PITMIX]

Gaston fits many of the forumeurs here I suppose.
He makes awesome and sometimes unnecessary bizzaroid stuff to make life easier. Me neither I am not a specialist, but given the high technicality of current cars I am sure that good computer scientists can tweak us a small program or electronics a small device to connect to the odb socket of the vehicle.

[Flytox]

Gaston fits many of the forumeurs here I suppose.
He makes awesome and sometimes unnecessary bizzaroid stuff to make life easier. Me neither I am not a specialist, but given the high technicality of current cars I am sure that good computer scientists can tweak us a small program or electronics a small device to connect to the odb socket of the vehicle.

Hello PITMIX

Without getting into the traffic of the ignition injection program for specialists ... you just put a bicycle cable clamp on the accelerator cable to limit its travel. By setting it for a new maxi speed at 110 km / h on the flat, this leaves enough power for quiet acceleration. Finally, you have to keep in mind that you are driving a calf in all circumstances, and get into the habit of taking margin when it comes to overtaking.

In use small provincial town (not too excited driving ), country road and motorway to (small) donf it is bathing.

[Gaston]

By setting it for a new maximum speed at 110 km / h on the flat,

By limiting the power, this system will save fuel, but it limits consumption in liters / hour and not as proposed by PITMIX in liters / 100 km.

The idea would be to make a limitation which adapts the maximum power according to the speed.
For example, we could thus have 5 hp, or 1 liter / h, at 10 km / h and 50 hp, or 13 liters / h, at 130 km / h while remaining under the limit of 10 liters / 100 km.

[Flytox]

The idea would be to make a limitation which adapts the maximum power according to the speed.

In stabilized speed this is done all by itself, the power delivered = power absorbed by the vehicle in the environment where it evolves.

For example, we could thus have 5 hp, or 1 liter / h, at 10 km / h and 50 hp, or 13 liters / h, at 130 km / h while remaining under the limit of 10 liters / 100 km.

During acceleration "we need" a lot more richness / power than to maintain a roughly equivalent speed. With the system that I described previously, but set for at 90 km / h it is not drivable, I even delayed the 2CV when accelerating! and it took me x minutes to go up to 90 km / h

The system you describe should manage acceleration, not cruising speed.

[PITMIX]

Flytox what you offer I have already done it on my old van but this does not allow such sharp consumption control. In addition when there is a beautiful coast the starting is difficult if not impossible.