Abstract: A method controls the rpm of a combustion engine in a hand-held work apparatus such as a brushcutter. The engine drives a work tool via a clutch which engages as a function of the engine rpm (n). A spark plug is arranged in the combustion chamber and is driven by an ignition unit. During start of the engine, an rpm lock circuit is active and defines a control variable as a function of the instantaneous rpm (nact) of the engine. According to the magnitude of this control variable, operating parameters of the engine are adapted to change the instantaneous rpm (nact). A control variable is determined for the adaptation of the operating parameters by the rpm lock circuit. The switch-off of the rpm lock circuit is provided when the control variable of the control lies outside a predetermined bandwidth of the absolute magnitude of the control variables.

Abstract: A method controls the rpm of a combustion engine in a hand-held work apparatus such as a brushcutter. The engine drives a work tool via a clutch which engages as a function of the engine rpm (n). A spark plug is arranged in the combustion chamber and is driven by an ignition unit. During start of the engine, an rpm lock circuit is active and defines a control variable as a function of the instantaneous rpm (nact) of the engine. According to the magnitude of this control variable, operating parameters of the engine are adapted to change the instantaneous rpm (nact). A control variable is determined for the adaptation of the operating parameters by the rpm lock circuit. The switch-off of the rpm lock circuit is provided when the control variable of the control lies outside a predetermined bandwidth of the absolute magnitude of the control variables.

Abstract: An air filter unit (1) for a carburetor (2) of a portable handheld work apparatus includes a filter element (3) and at least one clean air channel (10, 11) arranged between the filter element (3) and the carburetor (2). At least one condensation rib (29, 30, 31, 32) is arranged in the clean air channel (10, 11) running in flow direction.

Abstract: An air filter unit (1) for a carburetor (2) of a portable handheld work apparatus includes a filter element (3) and at least one clean air channel (10, 11) arranged between the filter element (3) and the carburetor (2). At least one condensation rib (29, 30, 31, 32) is arranged in the clean air channel (10, 11) running in flow direction.

Abstract: The present invention relates to a fresh gas supply system for an internal combustion engine, in particular of a motor vehicle. A fresh gas distributor can be connected on the inlet side with a fresh gas feed line, and on the outlet side to an internal combustion engine by means of several connection pipes. The connection pipes are allocated in each case to a combustion chamber of the internal combustion engine. An improvement in the fresh gas supply system can be achieved in that a bypass resonator or Helmholtz resonator is connected to the fresh gas distributor, which, at a predetermined revolution speed of the internal combustion engine, improves the fresh gas filling of the combustion chambers by resonance charging.

Abstract: The present invention relates to a fresh gas supply system for an internal combustion engine, in particular of a motor vehicle. A fresh gas distributor can be connected on the inlet side with a fresh gas feed line, and on the outlet side to an internal combustion engine by means of several connection pipes. The connection pipes are allocated in each case to a combustion chamber of the internal combustion engine.