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01-09-2017, 05:36 AM | #23 |
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I have it on my 2016 535D MS.
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01-09-2017, 12:20 PM | #24 |
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01-10-2017, 02:38 PM | #26 |
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Mine doesn't. You would assume that BMW know what they are doing but coasting sometimes saves fuel and sometimes costs fuel. Anyone know how smart it is in deciding when to coast?
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01-11-2017, 02:43 AM | #27 |
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How can coasting cost fuel, the fuel pump all but off.
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01-11-2017, 06:04 AM | #28 |
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a guess but if coasting , some fuel required to keep the engine turning over.
If in gear, the gears will keep the engine turning over - no fuel required but their will be some friction so the cars slows down. (engine braking) good question though. |
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01-11-2017, 06:48 AM | #29 |
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Imagine coming up to some red traffic lights. You get off the accelerator, head towards them and when you get close you apply the brake to come to a standstill.
Without coast. When you come off the accelerator the injectors shut down and you slow down due to engine braking until you apply the brakes. Then you use some brakes to stop. You burn no fuel and use some brake pad. With coast. When you come off the accelerator you "freewheel" towards the lights. You slow down less due to the lack of engine braking so you have to use more brake pad to stop and the engine has to be kept running on your approach to the lights. So you use more fuel and more brake pad. |
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01-11-2017, 07:34 AM | #31 | |
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01-11-2017, 07:44 AM | #32 |
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Because there are situations where is does save fuel. Generally it is more efficient to slow-down/speed-up as little as possible and coasting makes this more possible.
If you are on the motorway and you just back-off a bit to avoid crowding the guy in front, it's probably better to not actually use the engine braking so coasting is a fuel saver. Hence my question about how smart it is. The cars knows if you are on the M6 in medium traffic or if you are approaching a T-junction on a country lane. It could factor that in when it decides if it is worth coasting or not. A friend of mine has a push-bike that does indicators automatically. Imagine the pandemonium if BMWs suddenly all started to indicate. |
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01-11-2017, 12:16 PM | #34 | |
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Does the engine shut down, like start-stop, at any times coasting is used? I've assumed free wheeling has proven to be more fuel efficient than the over-run situation where the fuelling is off, above a certain rpm. The other question, if coasting is in operation that must impinge on the harvesting of energy for battery charging, as it seems in conflict with the boosting of the battery on the over-run. I suggest it requires some very smart energy management. |
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01-11-2017, 01:18 PM | #35 |
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Harvesting still works when Coasting on mine.
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01-11-2017, 03:01 PM | #36 |
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I don't think mine harvests when it is coasting based on the eco pro display as the needle on the display stays in the middle?
BMW's website says.. Another feature of the ECO PRO Mode is the coasting function in combination with Steptronic transmission: if within a speed range of 50–160 km/h the driver takes their foot off the accelerator and does not brake, the system disconnects the engine and the car coasts – i.e. rolls without engine power. Not a lot of help!! |
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01-11-2017, 03:09 PM | #37 |
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Is it showing the feature on the display during coasting?
If you are at idle rpm, while coasting, then there is no 'regeneration' possible, as you have to adjust the fuelling to drive an alternator, ("nowt for free"), you are not harvesting wasted energy, (there is no waste), like you can on the over-run as part of engine braking. It is either a speed related change over, or there has to be some smart energy management, if it is going to balance battery charging and coasting. It would have to select which is the most energy efficient/saving (or give priority to the battery if necessary), in every slow down situation. |
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01-11-2017, 03:12 PM | #38 | |
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Does coasting disengage below 50km/h? If so, then below that speed energy harvesting can swing over to the alternator on further over-run. |
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01-12-2017, 02:41 AM | #40 | |
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Not every time though, more when going down hills.
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01-12-2017, 04:04 AM | #41 | |
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Do you see the revs climb at the lower speeds, as coasting disengages? It may be as simple as coasting being engaged, or not. Intelligent energy management may have a part in whether coasting is disabled, if battery SOC (state of charge) is low and changing requires priority. |
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01-12-2017, 04:17 AM | #42 | |
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01-12-2017, 02:17 PM | #43 |
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If you have the multi functional instrument panel you can go into settings and change the Eco Pro display so that it looks just the same as the display in Comfort or Comfort+. Then you'll be able to see what happens too the revs during coasting.
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01-13-2017, 02:35 AM | #44 | |
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How do I do that out of interest?.
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