National Instruments NI DIDS-2003, Manual, Page: 123 / 214

National Instruments Direct Injector Driver System Manual
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EngineStatus
Tip Strip: Engine status based on StallSpeed and CrankRunThreshold
Detail: Indicates the status of the engine crankshaft as stalled, cranking, or running, depending on the values
of StallSpeed and CrankRunThreshold .
STALLED:
Crank speed is less than StallSpeed
CRANKING: Crank speed is greater than StallSpeed and less than CrankRunThreshold
RUNNING: Crank speed is greater than CrankRunThreshold
MaxCAT
Tip Strip: Maximum crank angle ticks for complete engine cycle
Units: CAT
Detail: Maximum Crank Angle Ticks per engine cycle. A Crank Angle Tick (CAT) is a single unit of angular
measure by the EPT function. MaxCAT is reported as power-of-two angular ticks of crank position travel,
having a resolution dependent on binary extrapolation level and the number of physical teeth per crankshaft
rotation. For example, if using the N-M EPT VI , which has an extrapolation of 7, the number of CAT per
crank tooth would be 2^7=128, and the internally calculated CurrentPosition would be evenly incremented
by 128 CAT from one physical tooth to the next. If a 60-2 pattern were used and the engine was a 2-stroke,
the MaxCAT per engine cycle would be 60*128=7680. If the engine was a 4-stroke, the MaxCAT per engine
cycle would be 2*60*128=15360.
CrankCount
Tip Strip: EPT crank pulse count while in sync
Units: pulses
Detail: The latest tooth count referenced to crank tooth 0. Tooth 0 is determined according to the pattern that
is being tracked and is discussed within the pattern specific EPT documentation . Also see the description
for GlobalTDCOffset . CrankCount is provided in terms of a complete engine cycle and is reported as if there
were no missing or extra teeth in the pattern. For example, if PATTERN = N-M, NumberOfCrankTeeth = 60
and Stroke = 4-STROKE, then CrankCount will range from 0 to 119.