Temperature-controlled fan delayed shut-off

Details Temperature-controlled fan delayed shut-off Temperature-controlled fan delayed shut-off

2006-05-09

2006-05-09

Kamen, Noah P. (Department: 3747)

Internal-combustion engines

Free piston

Single chamber; one piston

C227S010000

Reexamination Certificate

active

07040261

ABSTRACT:
The invention relates to a combustion driven working tool having a combustion chamber (2), a piston (8) guided in a cylinder (5), an ignition system for igniting a fuel supplied to the combustion chamber (2) for driving the piston (8) and a fan (7) at least for ventilating the combustion chamber (2). The running time and/or the speed of the fan (7) can be set as a factor of a measured temperature to realize a combustion driven working tool where an optimal ignition behavior can be set under changing working conditions, in particular under conditions of changing external temperature. A combustion chamber temperature is measured by a first temperature sensor (3) arranged on the combustion chamber (2) and supplied to a control unit (9), which calculates the cooling time and/or the speed for the fan (7) as a factor of the measured combustion chamber temperature and supplies these values to the motor (4). A second temperature sensor (12) is utilized for measuring the external temperature for the calculation of the cooling time or the speed of the fan (7).

REFERENCES:
patent: 5713313 (1998-02-01), Berry
patent: 6053132 (2000-04-01), Evans
patent: 6311887 (2001-11-01), Walter
patent: 4437796 (1996-03-01), None
patent: 0316468 (1992-03-01), None

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