Patent ID: 7498932

Claim:
A working device with an internal combustion engine and a vibration exciter, wherein the internal combustion engine comprises: a starting device to start the internal combustion engine; an oil reservoir near a crankcase to hold oil; an oil measurement device to recognize that oil is present in the oil reservoir and to produce a corresponding signal; and an evaluation unit to produce a first oil level reading based on the signal from the oil measurement device; wherein the first oil level reading is producible within a specified time period after the internal combustion engine is started; the time period is determined such that it ends before the vibration exciter is caused to operate by the internal combustion engine; and wherein during a single operating period, if the first oil level reading indicates a sufficiently high oil level, the first oil level reading remains even after the end of the specified time period after start, despite a subsequent oil level reading indicating an insufficiently high oil level.