BMW i4 eDrive40 - 08/2022 - Tanzanite Blue - Sensatec Cognac
Can I ask if anyone else is able to use the A/C toggle on their i4? My climate screen shows that toggle button but I can't turn it off (it is green no matter what). BMW genius tell me that I should be able to turn it off but that turning it off completely turns off the climate system - fans and all. They say it has the same function as the "All Climate" toggle button on the upper left. BMW Genius says that not being able to turn off the a/c to leave only the fans on was an issue already fixed in the ix and that they will eventually fix it in the i4 although it will require a trip to the dealer to reprogram
Can anyone verify that the A/C toggle works in their own vehicle?
Tesla Bjørns new 1000 km challenge editited (to 25 minutes) was published today - goes thru some of the updated iDrive.It took 5 days at the service department and refusing to accept “it’s designed that way” but they finally fixed. They updated the software to 09/2022.54. Now the A/C turns off.
It was done as part of the recall program. Took it in to the service centre in the morning and then picked it up in the afternoon.How did you get the update through the dealer?
You need to give it time; the calculations have all reset.Sorry, probably not exactly in the right post, but I have the following findings:
I got the latest update at the dealer today (version 07/2022/54) after they did the valet parking update, but now my e40 seem to have lost a lot of range in relation to the previous a software version. Normally I got about 530 km at 100% battery but now Is seems that I do not get more than 380 km at 100%. Driving mixed roads and 104 km on the highway always in eco pro.
Does anyone the same problem after this latest update?
Even if you do not want A/C, in hot weather the batteries and motor does, so the compressor will be running anyway. My understanding is turning off Cabin A/C will make a minimal impact on range. Heating makes more range impact than cooling. I plan on using the HVAC system just like I would in an ICE vehicle.
This is very interesting, but the indications have been that the i4's heat pump approach is a bit different from this, and the same heat pump is used for both battery temperature management and the cabin:Hello Guys - Your air conditioning compressor will seldom if ever operate in cooling mode during normal driving to remove heat from the battery, therefore it is not a concern regarding range.
As most know, the same AC compressor used to cool the cabin can also be used to cool (or heat / heat pump) to condition the battery for; aggressive driving, additional range or for fast charging. The cabin AC system does not cool the battery, they both use separate cooling circuits. Using a processor controlled manifold, it can divert to either the cabin or battery or cool both circuits. Unlike the cabin AC system which has an evaporator and uses a fan to cool the cabin, the battery cooling circuit instead chills coolant which is then circulated using a heat exchanger in the battery case to remove heat. This heat is then released outside the car from the AC condenser. Some EV's use two separate AC compressors
The AC battery cooling system operates (without user control) in cases where the lithium pack is either near or has reached over-temperature. A typical example of AC cooling is during fast charging where excess heat is generated in the cells, if cooling is not applied, the main processor, battery & charger processors will reduce the charge level (or even stop charging) to prevent over-heating the lithium cells.
Some EV manufactures (not all) use this same battery cooling system to cool the inverter, charger, motor(s) and single speed transmission (Or 2 speed transmission on BMW I8).
I included an image below of my Chevy Volt's cooling (heating) system which is typical of most systems today and engineered way back prior to the 2014 release of the Volt. The Volts system like many EV's also uses an "element heater" should temperatures be to low for AC heat pump use.
Regards - Mike View attachment 22505
Integrated Heating and Cooling System with Heat Pump Function.
The BMW i4 is equipped with a standard integrated heating and cooling system for the cabin, together with its high-voltage battery and its drive system that operates using an exceptionally efficient heat pump function. The system comprises three cooling/heating circuits that can be interconnected by means of electric valves with a shared expansion tank. While driving at low outside temperatures, the excess heat generated by the drive units is used to warm up the high-voltage battery. The highly integrated version of the heat pump developed by BMW uses up to 75 percent less energy than the system in the current BMW i3 (MY 2020). A two-level cooling module, a refrigerant compressor, two evaporators, a water-cooled condenser and a high-performance control unit together ensure optimum temperature control for both the BMW eDrive components and the vehicle interior in any operating state and in all regular weather conditions. At extremely low ambient temperatures, the heat pump is assisted by a pair of powerful continuous-flow heaters offering 9 kW of heating power each. This ensures that thermal comfort on a par with conventionally powered BMW models can be provided very efficiently in any situation. The latest version of the heat pump makes use of ambient heat and heat from dehumidification – as well as the waste heat from the motors – for energy-efficient operation.
The integrated heating and cooling system also insures optimal temperature control for the high-voltage battery in highly dynamic driving situations with high power requirements and when rapid-charging from a DC charging station. If the navigation system’s route guidance function is active and has scheduled a stop for the BMW i4 at a fast-charging station, anticipatory thermal management will automatically pre-condition the battery beforehand. Warming up the high-voltage battery or cooling it down as appropriate means it will be at the optimum temperature for quick and efficient charging at maximum capacity upon arrival at the charging station. Thermal management takes several factors into account here, including current battery temperature, remaining range, the predicted charging rate and the amount of electricity due to be fed to the battery according to the overall route calculation.
I think the "more advanced" part is also "more efficient" and the heat pump in particular works in conjunction with the heat generated by the motors plus ambient temperatures and so on to make this a much more complex equation than most who go about changing things understand. Even in your case, I suspect the savings was in the 9 kW heaters, not the heat pump.Hello - While the I4 is ceratinly a more advanced system than the Chevy Volt, they work on simuliar principles where the AC system has separate circuits (fan or chilled coolant) for both the cabin and battery.
The climate menu is a bit confusing - While driving in cool temperatures using only heated seats, I found that even though I shut everything down in the climate menu, the car was still producing heat and fan activity reducing range. Only after I shut the system down on the left climate menu did the system cease operating and the projected range increased by 15 miles.
Regards - Mike
That document I quoted above had this information, and is directly from BMW. Two 9 kW heaters for use when it gets cold.Thanks for the reply - 18 kw using two 9 kw heaters seems over the top and needs to be confirned. Most EV's manage with a 6kw heater. Were you able to get any type of OBD reader to work on your I4. I would surely like to document the system further. Many Thanks