Patent ID: 7341171

Claim:
A combustion-powered fastener-driving tool, comprising: a combustion-powered power source; at least one fan associated with said power source; at least one temperature sensing device in operational proximity to said power source; a control system operationally associated with said power source and connected to said at least one fan and said at least one temperature sensing device for adjusting the length of time for energizing said at least one fan as a function of power source temperature sensed by said at least one temperature sensing device; said at least one temperature sensing device includes 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, said control system is configured for 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 energizing said at least one fan as a function of said comparison; and said comparison is made in said control system 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 energizing said at least one fan as a function of said ΔT, such that a greater calculated temperature differential results in said control system increasing the length of energization time for said at least one fan.