Patent ID: 8070031

Claim:
A combustion-powered fastener-driving tool, comprising: a tool housing: a power source associated with said housing and including a cylinder head, a cylinder and a piston reciprocating in said cylinder, a valve sleeve reciprocating relative to said cylinder, a chamber switch and a trigger switch, said cylinder head, said cylinder, said valve sleeve and said piston combining to define a combustion chamber, the closing of both said switches required for initiating an ignition of said power source for driving said piston down said cylinder; a fan disposed in said combustion chamber; and a control system including a control program associated with said housing, connected to said power source, said chamber switch and said trigger switch, and providing a designated ignition delay period after fuel is injected into the combustion chamber and when the chamber switch is closed, and initiating combustion in the combustion chamber at the end of said delay period, said control system varying said delay period based on monitored tool parameters.