Patent ID: 11904448
Assignee: HILTI AKTIENGESELLSCHAFT
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A method for controlling a hand-held power tool, the method comprising:
driving a pneumatic impact mechanism with an electric motor, wherein an exciter piston of the pneumatic impact mechanism is driven periodically by the electric motor and an impact piston of the pneumatic impact mechanism is coupled to the exciter piston via a pneumatic chamber,
sensing an acceleration of a machine housing along a striking direction of the impact piston at different phases in movement of the exciter piston;
estimating a pressing force on a tool of the hand-held power tool on a basis of the sensed acceleration of the machine housing and a phase in the movement of the exciter piston;
determining the pressing force selected from the group consisting of a low pressing force, a medium pressing force, and a high pressing force; and
regulating a rotational speed of the electric motor depending on the sensed acceleration at the different phases.