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I presume that YDIS will display injector pulse widths for an HPDI injector. If so, have you ever monitored the pulse width to determine how long a big block HPDI injector remains open in milliseconds? At nominally 1000 psi I am thinking that it cannot be for long.
My initial thought seems to be that if the HPDI injector is working at 20 plus times the nominal pressure of a standard injector (1000 psi versus 45 psi), with the assumption that the orifices of both injectors are the same size (which they my not be, I don't know), that the HPDI injector would only need to be open for 1/20th of the time that a normal injector remains open to deliver the same amount of gasoline.
And since the HPDI injector may be open less than 1/20th of the time of a normal injector the current flow through same would be a hellava lot less. Which might be part of the explanation as to how the injector drivers can be operating on a 20 amp fuse but providing a 90 volt output across a 1 ohm injector. There is some voo doo doo doo going on the injector driver that explains all of this.
My initial thought seems to be that if the HPDI injector is working at 20 plus times the nominal pressure of a standard injector (1000 psi versus 45 psi), with the assumption that the orifices of both injectors are the same size (which they my not be, I don't know), that the HPDI injector would only need to be open for 1/20th of the time that a normal injector remains open to deliver the same amount of gasoline.
And since the HPDI injector may be open less than 1/20th of the time of a normal injector the current flow through same would be a hellava lot less. Which might be part of the explanation as to how the injector drivers can be operating on a 20 amp fuse but providing a 90 volt output across a 1 ohm injector. There is some voo doo doo doo going on the injector driver that explains all of this.
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