BMW Patent injecting water in an engine

Water injection in thermal engines and the famous "pantone engine". General informations. Press clippings and videos. Understanding and scientific explanations on the injection of water into engines: ideas for assemblies, studies, physico-chemical analyzes.
Christophe
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by Christophe » 20/02/15, 10:25

Yes just as you have to manage the ice ... of meteorological origin!

After, for me, the implementation of the water injection is less important than the thermodynamic effects at the level of the combustion that it allows!
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Macro
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by Macro » 20/02/15, 18:36

They master the high pressure injection of fuel ... Not at all the injection of water..The least drop and hop injectors to the pile
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by Christophe » 20/02/15, 19:08

Uh ... they still know more than us ... : Cheesy:

Maybe they should take some lessons from fellow Kärcher :D Hey, we almost all have an HP injection at home : Cheesy:
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by Macro » 20/02/15, 19:50

Christophe wrote:Uh ... they still know more than us ... : Cheesy:

Maybe they should take some lessons from fellow Kärcher :D Hey, we almost all have an HP injection at home : Cheesy:


Karcher 250bars is pee ... An HP injection starts at 300 and it goes up to ... 1500bars ...

In terms of fuel injection the bosch (even if they excel) the others are expected to succeed before putting theirs on the market ...
Premiere golf TDI 1993, first real TDI fiat croma in the middle of 80 ... first injections HP on VP system Delphi lucas ... the first common ramps bosch ... Mounted on fiat engines ...
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by Christophe » 20/02/15, 20:16

At 200 bars we can already do a very good misting and we do not necessarily need the misting accuracy (size of the droplets) fuel injectors!

Especially in case of indirect injection (the case on the M4) the engine depression will further reduce the size of the droplets see spray water completely!

I do not know if direct injected water injection is the best solution: too much pressure, too much relaxation ... but these 2 patents, contrary to the choice retained on the M4 (so we continue the search for patents ), evoke the direct injection ...

ps: the mist sprayers at 3 bars are already making beautiful little droplets ...
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by Flytox » 20/02/15, 22:01

Macro wrote:They master the injection of high pressure fuel ... Not at all the injection of water ..The least drop and hop injectors to the pile

Injectors that accept to puff water with diesel it has been "developed" for years, there were entire fleets of buses which operated on aquazole in the 90s. For gasoline vehicles, not still doing the research. : Mrgreen:

About the problems of water in the system, they just talk about filtering ..... not sure that it will be enough with limestone etc .... Use distilled water?
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by Remundo » 21/02/15, 09:00

Absolutely, I recommend distilled water ... The injectors are so fine and sensitive ... It is much more sensitive than the water of the batteries!
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by wirbelwind262 » 21/02/15, 12:51

Ach so, the return of the Methanol-Wasser 50 .....
at BMW, they have experience with their bmw 801 ...
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by Flytox » 22/02/15, 19:44

translation EP2789839
Rather painful translation .....

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Someone to decode the crobar?
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http://www.editions-harmattan.fr/index. ... te&no=4132
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by wirbelwind262 » 23/02/15, 15:57

Hello
(I repeat the text, it is explained in)

DESCRIPTION EP2789839

The fuel injection is preferably carried out at the same time exclusively in either the combustion chamber or exclusively in the suction line, but not in both.
The injection of water, however, preferably always takes place in the combustion chamber and not in the suction pipe, but it can, depending on the range of internal combustion engine or of their mode of operation load to be suspended.
[0013]

For example, in a first load range or
engine operating mode combustion is injected, no water, and the fuel can be injected only by the first nozzles in the combustion chambers.
This mode of operation is the cheapest to an engine cold start or the regeneration of a catalyst, ie in cases where heating of the engine or the generation of the desired high temperature of the exhaust gas.
[0014]

In a second load range, which lies in particular in a medium speed range below the fully charged, no water is preferably injected and the fuel is injected only through the injectors in the second pipe respective suction.
This second load range may be found in load of the internal combustion engine, for example at least 4000 1 / min and less than about 200 nm (or less than 100 Nm / liter displacement).
[0015]

Is in a third load range, in particular in a medium speed range is substantially fully charged, while the water is preferably injected through the first nozzles in the combustion chambers and the fuel is injected only through the second nozzles in the suction pipe.
This third load range, for example, less than 4,000 1 / min and 200 Nm
[0016]

(Or about 100 Nm / liter) are located on the engine.
In this range, the cooling effect is desired by the injected water and ensures z.
IE for an increase in internal combustion engine performance.
The timing of the injection of water can be compensated during the engine cycle with respect to the fuel injection timing.
[0017]

Located in a fourth load range, particularly in a high speed range is substantially fully charged, the water and fuel through the first nozzles may be injected into the combustion chambers.
This fourth load range may, for example above 4000 1 / min and greater than about
150 Nm (approximately 75 Nm / liter) are the engine.
[0018]

The figures above are of course a function of the motor and can vary the internal combustion engine of the internal combustion engine.
In principle, we recommend high-speed injection of water and areas with high load, where the cooling effect is advantageous.
[0019]


to lighten:
KST = kraftstoff = fuel
H₂O = fleet
S and B correspond to 2 injection ramps
B injectors in the combustion chamber
S injectors in the intake duct

the crobar succinct is an injection strategy depending on the load (torque demanded) and the engine speed
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