Altronic VariSpark CPU-XL, Руководство по эксплуатации, Страница: 43 / 97

CPU-XL VariSpark IOM 07-21
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27.5 The above user programmable thresholds need to be adjusted based on the
type of coil being used and on the operating characteristics (specifically,
voltage demand) of the engine. Slight variations are normal between coils of the
same type. In order to maximize the usefulness of the cylinder spark reference
number, it is recommended that all coils be of the same type and vintage
(production date). This will aid greatly in detecting variations in one cylinder vs.
the general trend in the engine.
27.6 The High Spark Voltage Threshold, Low Spark Voltage Threshold, High From
Engine Threshold, Low From Engine Threshold, and Hi COV Threshold should
be adjusted as experience dictates. It will take some testing and adjustment
to obtain thresholds that optimize the use of these features. For maximum
benefit, the spark reference number for each cylinder should be recorded at
normal operating load with new spark plugs installed and then monitored over
a period of time for changes. The HI SPARK VOLTAGE alarm level should be
set (typically) at 255 initially, and can be adjusted as experience dictates. A
gradual increase in the spark reference number is expected over time as the
spark plug electrodes erode.
27.7 In addition to energy control and the diagnostic flags, the reference numbers
can also be used for predictive purposes:
A. As the numbers increase toward the preset HI SPARK VOLTAGE threshold,
the operator knows that a change of spark plugs should be scheduled. With
this information, this function can be determined on an actual need basis
rather than a predetermined schedule. Also, unexpected engine misfiring or
shutdowns can be avoided by tracking the reference numbers on a routine
basis.
B. The reference numbers can provide an early warning of a difference in
operation in a given cylinder(s). A reading higher (or lower) than the other
cylinders, when such a difference is not normally present, tells the operator
of a potential problem; this allows further troubleshooting and evaluation to
take place before an unexpected operational problem develops.
27.8 Other Information regarding the spark reference number: The spark number
setting has only a small effect on the reference number if the spark plug fires
correctly. Therefore, the high and low voltage thresholds should hold across
the different profiles if the spark plugs continue to fire correctly. On the other
hand, a worn plug may not fire consistently on one given spark number, but will
fire consistently on another; in this case there will be a significant difference
in the reference number when the setting is changed. Operators may be able
to increase spark plug life by operating initially with new spark plugs on spark
number 1 and using the HI SPARK VOLTAGE alarm as an indicator to change
the spark number.