Combustion-operated setting tool
AssigneeHilti Aktiengesellschaft
InventorTilo Dittrich
Life of this patent
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Abstract
A combustion-operated setting tool (10) for driving in fastening elements, includes a combustion drive for driving a setting piston (13) displaceable in a guide cylinder (12) and which drive has at least one combustion chamber (14), a ventilator (16) for the combustion drive, a control unit (30) for controlling the ventilator (16) dependent on a thermal control parameter and having a program for modeling the thermal control parameter based on time data and ventilator operation data.
Claims11
A combustion-operated setting tool (10) for driving in fastening elements, comprising a guide cylinder (12);
- a setting piston (13) displaceably guided in a guide cylinder (12);
- a combustion drive for driving the setting piston (13) and having at least one combustion chamber (14);
- a ventilator (16) for the combustion drive;
- and a control unit (30) for controlling the ventilator (16) dependent on a thermal control parameter (T_new), and including a program for modeling the thermal control parameter (T_new) based on time data and ventilator operation data.
A method of controlling combustion-operated setting tool having a ventilator (16) for a combustion drive and a control unit (30) for controlling the ventilator, comprising the steps of:
- triggering a setting process (44) after a trigger switch signal has been detected (43);
- reading out (45a) from the data storage (31) the modeled thermal control parameter of a preceding setting process (T_old), the timestamp (t_old), and the ventilator operating data;
- modeling (46) a new thermal control parameter (T_new) (46) based at least on the thermal control parameter of the preceding setting process (T_old), the timestamp (t_old), a current time (t_new), the ventilator operating data, and based on heat supply constant (K2) and heat discharge constant (K1);
- and
- storing (52) the new modeled thermal control parameter (T_new) of the combustion drive in the data storage (31) as a modeled thermal control parameter (T_new) of a preceding setting process (T_old), storing the current time (t_new) in the data storage (31) as a timestamp (t_old), and storing the ventilator operating data in the data storage (31).
Dependencies are inferred from the claim text.