Method for Damage Diagnosis in a Handheld Work Apparatus
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United States of America Patent
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N/A
Issued Date -
Jul 19, 2012
app pub date -
Jan 17, 2012
filing date -
Jan 17, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A handheld work apparatus has a combustion engine with an ignition unit, a unit for supplying fuel and a device to determine the rotational speed (n). The ignition unit includes a spark plug, a coil and a pole group. The pole group and the coil are moved in dependence on the rotational movement of a crankshaft of the combustion engine, whereby a ignition voltage is induced in the coil. The work apparatus has an open loop control which controls the ignition time (ZZP). A diagnostic unit for damage diagnosis is detachably connected to the work apparatus. For damage diagnosis, the diagnostic unit captures the course of the induced ignition voltage over at least one engine cycle when the combustion engine is running and damage is determined on the basis of the course of the captured voltage.
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