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Old 07-08-2015, 09:01 PM   #11 (permalink)
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Originally Posted by California98Civic View Post
Remembering to refill a water bottle with (I assume) highly purified water would be viewed by most consumers as a bigger pain than high octane fuel. And the cost savings in fuel would be at least partly offset by the cost of such water, wouldn't it? Why is BMW interested?
You might mean distilled water. Some alcohol might be added to lower the freezing point too.

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Old 07-08-2015, 11:26 PM   #12 (permalink)
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Quote:
Originally Posted by California98Civic View Post
Remembering to refill a water bottle with (I assume) highly purified water would be viewed by most consumers as a bigger pain than high octane fuel. And the cost savings in fuel would be at least partly offset by the cost of such water, wouldn't it? Why is BMW interested?
If you read the article...

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In the 1 Series prototype, water is recovered from the air conditioning system--a much more convenient method.
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Old 07-09-2015, 12:59 AM   #13 (permalink)
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Aha! Yes, I missed that line... reading a little too quickly. But I wonder still how they plan the car to respond to drivers in dry or cool climates... or if they stamp on the go pedal a lot but hate AC. Winter? I guess the ECU could run things differently if there is no water to inject? Or there could be a way to add water.

Anyway, it's pretty damned clever, even if it seems to me to be something for a niche more than the mass market. I guess that's their goal.
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Last edited by California98Civic; 07-09-2015 at 11:55 AM.. Reason: "there" not "their"
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Old 07-09-2015, 08:37 AM   #14 (permalink)
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I'd imagine they'd have a 'low water' light. If you run out of water, they'd really have to retard timing I would think to avoid knock.

I honestly can't see the A/C system providing that much water, but I could be wrong. Also, that fuel efficiency increase is really going to take a hard hit if you have to use the A/C to refill the water supply.
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Old 07-09-2015, 08:43 AM   #15 (permalink)
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Or they use the water from the a/c to get better fe and make up for the loss from the a/c?
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Old 07-09-2015, 09:26 AM   #16 (permalink)
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I would be worried about hydro-locking the engine.
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Old 07-09-2015, 09:57 AM   #17 (permalink)
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Originally Posted by Daox View Post
I'd imagine they'd have a 'low water' light. If you run out of water, they'd really have to retard timing I would think to avoid knock.

I honestly can't see the A/C system providing that much water, but I could be wrong. Also, that fuel efficiency increase is really going to take a hard hit if you have to use the A/C to refill the water supply.
I'm sure climate control is always on when one drives a BMW. AC is used even in the winter to keep the windows from fogging. Just call it a de-humidifier.
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Old 07-09-2015, 12:06 PM   #18 (permalink)
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I would be worried about hydro-locking the engine.
I'd bet the ECU is set to prevent water injection in a number of scenarios long before there is significant risk of hydro-lock, much in the way Honda's lean burn system will not work if there is the CEL is on.

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I'm sure climate control is always on when one drives a BMW. AC is used even in the winter to keep the windows from fogging. Just call it a de-humidifier.
Yes, and even if the A/C is always-on, in an arid or semi-arid climate, like where I live, there will be less water to remove and therefore to inject. I would think they would want to offer an ability to add water somehow, like one might add windshield fluid. In fact, to reduce the likelihood somebody jus dumps tap water into the system, they could call it "BMW-Power-Water" and charge oodles of dollars for it. "Use only BMW 345p Special Water" could be printed on the cap... dealerships will love that.
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Last edited by California98Civic; 07-09-2015 at 12:12 PM.. Reason: typos
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Old 07-09-2015, 12:11 PM   #19 (permalink)
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Love it, "BMW-Power-Water"
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Old 07-09-2015, 02:39 PM   #20 (permalink)
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If the natural humidity is low just leave a bucket with tap water inside, far cheaper than buying distilled water.


Quote:
Originally Posted by Daox View Post
I'd imagine they'd have a 'low water' light. If you run out of water, they'd really have to retard timing I would think to avoid knock.
Retard ignition timing, increase the intake valve timing to lower the dynamic compression ratio (a VVT miracle), sure they know how to overcome it.


Quote:
I honestly can't see the A/C system providing that much water, but I could be wrong. Also, that fuel efficiency increase is really going to take a hard hit if you have to use the A/C to refill the water supply.
What if it had an all-electric A/C, like the Prius?

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