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National Instruments Direct Injector Driver System Manual
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PFIX_TDC
Tip Strip: Selects Top Dead Center reference associated with driver channel
Detail: TDC parameters are mapped to a specific PFI Driver channel by selecting a TDCX from the drop-
down list in each PFIX_TDC parameter, where X is the PFI Driver channel number.
PFI_Firing_Window_Start / PFI_Firing_Window_End
Tip Strip: Start of angle-based window around all injection events for a channel, End of angle-based window
around all injection events for a channel
Units: DBTDC
Detail: The four PFI channels within the PFI Driver module share software functions and are multiplexed.
Only one PFI channel within the PFI Driver module is able to operate at one time. Therefore, angle-based
firing windows are used to define a period during which an injection event can take place for a given PFI
channel. A firing window is created around each PFI channel, specified by a firing window start and end
parameter for the PFI Driver module. The firing window must not be greater than a span of 180 degrees,
such that the firing windows around each of the four channels overlap. If the windows around each of the
four PFI channels overlap, then the Firing Window Overlap Detected Indicator will be set TRUE and one or
more of the four injector channels may not operate.
PFI_Firing_Window_Start: Defines the start of the window in Degrees Before Top Dead Center (DBTDC).
The TDC reference for the window is the TDCX value associated with the applicable PFI channel.
PFI_Firing_Window_End: Defines the end of the window in Degrees Before Top Dead Center (DBTDC).
The TDC reference for the window is the TDCX value associated with the applicable PFI channel.