Arrangement for identifying a switching position of a switch on an internal combustion engine in a handheld work apparatus

摘要

The invention relates to an arrangement for identifying a switching position of a switch (on an internal combustion engine in a handheld work apparatus. An energy source for supplying power to an inductive electrical load is provided, it being possible to connect the load to the energy source in order to be switched on and off via a controller. The switch is arranged in a voltage branch which is connected in parallel with the inductive load and in which a zener diode is also connected. The zener diode is activated or inactivated via the switch as a function of the switching position of the switch. The amplitude of the switch-off voltage, which is induced when the inductive load is disconnected, is limited by the zener diode, so that it is possible to read from the magnitude of the amplitude whether the switch is closed or open.

主权项

1. An arrangement for identifying a switch position of a switch on an internal combustion engine in a handheld work apparatus, the arrangement comprising:
a control; an inductive electrical load; an energy source configured to supply said inductive electrical load with energy; said inductive electrical load being connected to said energy source via said control so as to be switched on and off; a first voltage branch disposed parallel to said inductive electrical load; said switch being a first switch having a first and a second switch position and being arranged in said first voltage branch; a first zener diode arranged in said first voltage branch; said first zener diode being configured to be switched to an active state and an inactive state in dependence upon the switch position of said first switch; said inductive electrical load being configured to cause an induced switch-off voltage having an amplitude when said inductive electrical load is switched off; said first zener diode being configured to limit said amplitude of said induced switch-off voltage; and, an evaluation unit configured to evaluate said amplitude of said switch-off voltage which adjusts in dependence upon the position of said first switch.