Nav Estimate of Ending SOC & Elevation

[kmcdonal]

Has anyone figured out what all the nav system takes into account when computing the end of trip state of charge? I specifically am interested in whether it takes elevation gain and weather en-route into account.

If I enter a destination in the mountains into the nav system and look at the estimated charge left at the end of the trip, it seems to assume a much higher consumption rate than when I am coming back down. I am talking about roughly 4,000 feet of elevation gain on the way up and 4,000 on the way down. That said, the nav system seems to over-estimate how much battery I will have left after going up the mountain. In other words, while it has increased its estimated consumption, it doesn't seem to have increased it enough for the elevation gain. The opposite goes for going down the mountain. Just to be clear, this is the estimate that comes up right when you enter the destination and before you have started driving.

My hypothesis is that the nav system is taking elevation gain into account, but the algorithm does not fully take into account how much more energy is required to go up. Often when I am going up the mountain I need to get around slow moving trucks and that requires brisk acceleration and more consumption than what is included in the nav's calculation. This is just my hypothesis and I have nothing other months of trial and error to back it up. I looked in the Good to Know app and a few other places and haven't seen anything specific about how the nav system computes end of trip SOC.

This is probably wishful thinking, but if the nav system was looking at temperature en-route, that could play a factor too. When you gain 4,000 feet, the temperature drops a lot. That said, that would be a lot more smarts than I am expecting out of Porsche's first gen electric car, but maybe I am wrong.

Anyone have any thoughts on what the navigation system uses to determine consumption for a trip?

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[Scandinavian]

In Range driving mode, the Porsche Intelligent Range Manager automatically changes the speed limit and the climate mode as required. While this allows the most economical driving possible in conjunc- tion with the manual speed limitation and air conditioning settings, the Porsche Intelligent Range Manager dynamically optimises the routes on the basis of routing, topography, speed and traffic information. In this way the travel time can be kept to a minimum without sacrificing comfort.

The vehicle also predicts the electrical power consumption of the air-conditioning system and the conditioning of the components based on the outside temperature, humidity and sunshine, as well
as the currently selected driving program and the respective setting of the automatic climate con- trol system. The current range is calculated using these figures. In a parallel process, PIRM (Porsche Intelligent Range Manager) provides a background forecast for the other driving programs. When route guidance is activated, if the range calculation shows that the destination can be reached with a low battery charge, the system switches to a more energy-efficient driving programme and a different climate control mode.
Dr. Ing. h.c. F. Porsche AG
Public Relations and Press Porscheplatz 1
D-70435 Stuttgart
Porsche Press Kits Porsche Press Database The Porsche Newsroom Press contacts
https://presskit.porsche.de https://presse.porsche.de http://newsroom.porsche.de http://porsche-qr.de/contacts

Document at:
https://e-performance.io/en/taycan-technology

From the above cuts from an early press kit, I world think the Taycan takes weather, elevation, speed etc into the calculation. Your own driving style as well as sudden bursts of power can not easily be predicted, but normal driving etc should all be included.

The same seems to be the case when when estimating the range once you start driving the car.

 

[kmcdonal]

In Range driving mode, the Porsche Intelligent Range Manager automatically changes the speed limit and the climate mode as required. While this allows the most economical driving possible in conjunc- tion with the manual speed limitation and air conditioning settings, the Porsche Intelligent Range Manager dynamically optimises the routes on the basis of routing, topography, speed and traffic information. In this way the travel time can be kept to a minimum without sacrificing comfort.

The vehicle also predicts the electrical power consumption of the air-conditioning system and the conditioning of the components based on the outside temperature, humidity and sunshine, as well
as the currently selected driving program and the respective setting of the automatic climate con- trol system. The current range is calculated using these figures. In a parallel process, PIRM (Porsche Intelligent Range Manager) provides a background forecast for the other driving programs. When route guidance is activated, if the range calculation shows that the destination can be reached with a low battery charge, the system switches to a more energy-efficient driving programme and a different climate control mode.
Dr. Ing. h.c. F. Porsche AG
Public Relations and Press Porscheplatz 1
D-70435 Stuttgart
Porsche Press Kits Porsche Press Database The Porsche Newsroom Press contacts
https://presskit.porsche.de https://presse.porsche.de http://newsroom.porsche.de http://porsche-qr.de/contacts

Document at:
https://e-performance.io/en/taycan-technology

From the above cuts from an early press kit, I world think the Taycan takes weather, elevation, speed etc into the calculation. Your own driving style as well as sudden bursts of power can not easily be predicted, but normal driving etc should all be included.

The same seems to be the case when when estimating the range once you start driving the car.

Thank you - great info. This makes it sound like putting the car in range mode is key. I don't consistently use range mode. That could be why my estimates are a bit off. I will have to try using range mode both directions to see what happens.

 

[Gubbjaevel]

Just to be clear:

"Range mode" and "Porsche Intelligent Range Manager" are 2 separate things.

Range mode is available on all cars, but consider it "range light".

PIRM is a package you can buy with the car.. or an app, if you will. Which will take in account what was previously described. Don't know how many people bought this package? (~300 EUR)

 

[kmcdonal]

Just to be clear:

"Range mode" and "Porsche Intelligent Range Manager" are 2 separate things.

Range mode is available on all cars, but consider it "range light".

PIRM is a package you can buy with the car.. or an app, if you will. Which will take in account what was previously described. Don't know how many people bought this package? (~300 EUR)

Gotcha. I did pay for PIRM. I clearly need to do more reading on it.

 

[Dee]

...
When you gain 4,000 feet, the temperature drops a lot. That said, that would be a lot more smarts than I am expecting out of Porsche's first gen electric car, but maybe I am wrong.
...

It's about battery temperature, not outside temperature in this case.
When you go up 4K feet, the battery is still on the same temperature and drawing current from it, it heats up while you're driving also.

 

[Scandinavian]

Just to be clear:

"Range mode" and "Porsche Intelligent Range Manager" are 2 separate things.

Range mode is available on all cars, but consider it "range light".

PIRM is a package you can buy with the car.. or an app, if you will. Which will take in account what was previously described. Don't know how many people bought this package? (~300 EUR)

PIRM seems a complete waste of money and seems very annoying if you look through the forums and some you tubers that have tried it. It tries to limit speed and takes unnecessary routes.

Please note that the two copies I posted before do not sit together in the PDF that I copied it from. The should be two very separate issues as you say!

I only tried to show that Porsche takes both traffic, weather and elevation into account when estimating SOC at arrival.

 

[Kingske]

Just to be clear:

"Range mode" and "Porsche Intelligent Range Manager" are 2 separate things.

Range mode is available on all cars, but consider it "range light".

PIRM is a package you can buy with the car.. or an app, if you will. Which will take in account what was previously described. Don't know how many people bought this package? (~300 EUR)

I bought PIRM but never used it so far. Is it worth trying?

 

[Oink]

How do you even use PIRM?

 

[Mouse House]

I specifically am interested in whether it takes elevation gain and weather en-route into account.
...
In other words, while it has increased its estimated consumption, it doesn't seem to have increased it enough for the elevation gain. The opposite goes for going down the mountain.

I do quite a lot of journeys with decent elevation difference - I live at 550m and have a holiday home at 1650m. Can't say I have any insight into how the range estimation actually works, but my experience is similar to yours: with a destination set in the nav it gets within a couple of percent going uphill, but does not estimate the downhill key well at all.

Heading up to the chalet costs about 47% charge, and coming back costs 34%. The battery actually recharges a bit on the initial part when I drop down into the valley.

It's awesome that I can do the round trip on a single charge.

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