Ford's answers to the NHTSA 6.7 Investigation
There was a request for a link to Ford's answer's to the NHTSA investigation posted on a previous thread, since closed. Here is the link: Ford's NHTSA Answers to the 6.7 investigation This PDF i...
Forum Discussion
Ben:
I am wondering aloud how useful is the injection event pressure wave is.
We know there are multiple injection events, 5?
The injector can modulate time, but not modulate volume --- which is a function of the common rail accumulator.
Piezo crystal discs are stacked to amplify the movement, with a mechanical lever to amplify.
Relatively high voltages are used (100-400V, presumably DC).
There would be a discrete pressure wave at the injector that is fed back to the common rail via the fuel supply pipe.
However, because of the number of events, it is unlikely to set up a sizable standing wave.
As you note, it is also too hard to simulate / guess without a laboratory measure.
So what I am thinking... is the effect too small?
Is there more of a probability of a large pressure wave from the pump reflecting back from the accumulator / common rail and setting up a standing wave?
http://www.youtube.com/watch?v=u-ZC1FaNDh0
I am wondering aloud how useful is the injection event pressure wave is.
We know there are multiple injection events, 5?
The injector can modulate time, but not modulate volume --- which is a function of the common rail accumulator.
Piezo crystal discs are stacked to amplify the movement, with a mechanical lever to amplify.
Relatively high voltages are used (100-400V, presumably DC).
There would be a discrete pressure wave at the injector that is fed back to the common rail via the fuel supply pipe.
However, because of the number of events, it is unlikely to set up a sizable standing wave.
As you note, it is also too hard to simulate / guess without a laboratory measure.
So what I am thinking... is the effect too small?
Is there more of a probability of a large pressure wave from the pump reflecting back from the accumulator / common rail and setting up a standing wave?
http://www.youtube.com/watch?v=u-ZC1FaNDh0
