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National Instruments Direct Injector Driver System Manual
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Plus1 tooth. As another example, if the Plus1 tooth is retarded, and NumberOfCrankTeeth = 6, then CrankCount
would increment from 0 to 5, such that tooth 5 would correspond to the tooth immediately after the Plus1 tooth and
tooth 0 would correspond to the second tooth following the Plus1 tooth.
4-Stroke Applications (Stroke = TRUE):
For advanced Plus1 tooth configurations, position 0 and tooth 0 coincides with the first tooth following the
Plus1 tooth while the CamSig input is TRUE. For retarded Plus1 tooth configurations, position 0 and tooth
0 coincide with the second tooth following the Plus1 tooth while the CamSig input is TRUE. The CamSig is
actually only used for achieving initial sync. Once sync is achieved, it is maintained according to the location of
each Plus1 tooth. However, CamSig is still monitored to report whether the signal is normally alternating high
and low at each Plus1 tooth. The CamHistory indicator of the EPT tab reports whether the signal is “Normal”,
“Always High”, “Always Low”, or an unexpected pattern reported as “Error”. CrankCount will increment from 0 to
2*NumberOfCrankTeeth - 1. CrankCount will not increment at the Plus1 tooth. For example, if the Plus1 tooth is
advanced, and NumberOfCrankTeeth = 6, then CrankCount would increment from 0 to 11, such that tooth 5 and
tooth 11 would correspond to the tooth immediately before the Plus1 tooth while CamSig is FALSE and CamSig is
TRUE, respectively. Tooth 6 and tooth 0 would correspond to the tooth immediately following the Plus1 tooth while
CamSig is FALSE and CamSig is TRUE, respectively.
Tooth numbering for the two different Plus1 tooth location configurations is shown in figures 4.6.c and 4.6.d below.
Figure 4.6.c, 6+1 (advanced) crankshaft trigger wheel tooth numbering