Ignition module with rotational speed limitation for an internal combustion engine
AssigneePrufrex-Elektro-Apparatebau Inh. Helga Muller, geb./Dutschke
InventorLeo Kiessling
Life of this patent
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Abstract
A revolution threshold regulator and/or toggle switch has a first and a second fixed phase source of alternating current having a frequency proportional to the revolution speed of a rotor of an internal combustion engine. A trigger device scans the alternating currents to emit a control signal at a revolution threshold above or below a preset revolution threshold. The trigger device has a timer module which cooperates with one of the alternating current sources through a trigger charge element which can be discharged via at least one discharge path to create a control signal. The trigger charge element, as it discharges, sends a control current through a series Zener diode in a blocking direction to the control signal output.
Claims18
A revolution threshold regulator and/or toggle switch with a first and a second fixed phase source of alternating current which are generated dependent on and, in their frequency, proportionally to the revolution speed of a rotor, and with a trigger device which scans the alternating currents to emit a control signal at a revolution threshold above or below a preset revolution threshold, where the trigger device has a timer module, and this timer module works with one of the alternating current sources from the chargeable trigger charge element which can be discharged via at least one discharge path to create a control signal, where the trigger charger element, as it discharges, sends a control current through a series Zener diode in a blocking direction to the output for the control signal.
An apparatus for starting a motor, especially in hand-held tools, with a magnetic generator which induces alternating current based on the revolution speed and thus charges an ignition charger element for ignition energy, and with a trigger which scans the alternating current to activate an ignition circuit that is discharged via the primary coil of an ignition transfer, where a revolution-related function is activated by a revolution circuit, which is designed such that the revolution circuit which works by comparing 2 fixed events with the time of an electronic circuit controlled by the RC timer, where the timer is started by a first fixed event which is a voltage pulse and the switch state of the revolution circuit when the second event which is a voltage pulse occurs is determined by the time of the second event relative to the controlling end of the timer, where the start of the control with the first fixed event and the end of the control with the charge amplitude being undercut by approximately 50% from C of the RC timer.
Dependencies are inferred from the claim text.