Patent ID: 7497271

Claim:
A method of operating a combustion powered tool, having a combustion chamber and at least one fan located in operational relationship to the combustion chamber, the method comprising: determining whether the tool is operational; monitoring the tool temperature upon determination that the tool is operational; turning on the at least one fan for a predetermined amount of time when the tool temperature exceeds a predetermined value; turning off the at least one fan when the predetermined amount of time has not expired and the tool temperature falls below a predetermined low value; and said temperature monitoring step includes providing a first temperature sensing device located close to said power source, and a second temperature sensing device located remotely on said tool from said power source and measuring ambient temperature, receiving input signals from said first and second temperature sensing devices, comparing said input signals from said first and second temperature sensing devices, and for adjusting the length of time for turning on said at least one fan as a function of said comparison; and said comparison is made by calculating a ΔT representing a temperature differential obtained by comparing measured temperature values of said first and second temperature sensing devices and adjusting the length of time for turning on said at least one fan as a function of said ΔT.