Prufrex-Elektro-Apparatebau, Inh. Helga Muller, Geb Dutschke

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Prufrex-Electro-Apparatebau Inh. Helga Muller, Geb. Dutschke

Werner Erhard

Werner Flugel

An ignition method and system for internal combustion engines, especially in lawn mowers or chain saws, in which a magneto induces a plurality of alternating voltage half-waves for each engine revolution to charge an energy-storing element and to discharge it by a switch controlled by the primary coil of an ignition transformer. The switch is actuated when the first half-wave of each revolution reaches a trigger threshold. The ignition system induces the charging alternating voltage dependent upon the rotary position of the engine for the energy storage element and for discharging it via the switch for firing the spark synchronously with the alternating voltage. The system has a timer module which responds to the alternating voltage by producing a signal to block the ignition switch for the duration of a time interval which corresponds to a top speed limit of the internal combustion engine.

Ignition process, arrangement and apparatus for internal combustion

Ignition process, arangement and apparatus for internal combustion

A capacitor ignition system for internal combustion engines, particularly for lawn mowers, chain saws, abrasive cutting-off machines, etc., has a magnetic generator for triggering a primary firing pulse generator to charge a capacitor. An electronic switch discharges the capacitor via the primary winding of the ignition coil. The primary pulse generator controls a tachometer to address a stored characteristic ignition field program to thereby provide an rpm-dependent delay in the firing pulse relative to the magnetic generator pulse. The characteristic ignition field program has different advance curves for the same rpm under different operating conditions. A switching-over device monitors the operating state of the engine in order to switch over from a starting igntion advance curve to an operating ignition advance curve and back again. The starting ignition advance curve and operating ignition advance curve overlap in a region of the rpm which has the idling rpm as the upper limit. The lower limit of the operating ignition advance curve is always above the starting ignition advance curve and is set to a value of rpm above the rpm achievable by cranking the engine.

Capacitor ignition system

Inductive rotary emitter for controlling the instant of ignition of internal combustion engines, has a coil with a permanent magnet core and a yoke wheel turned by a shaft. Circumferentially distributed projecting, spaced, tooth-like segments on the yoke wheel are moved past the magnet poles for voltage induction. Tangentially adjacent tooth segments are at differently spaced intervals from one another.

Method and system with inductive rotary emitter for the control

A control system for the carburetor of an internal combustion engine wherein the carburetor has a choke valve disposed at the inlet of the carburetor induction tube and the choke valve is operated automatically by an actuator. The actuator for the control includes a pulse-width modulator in which the pulse width or the degree of modulation is influenced by a family of characteristics stored in a programmable memory, the memory applying signals to the pulse-width modulator for pre-specified air-fuel mixtures in accordance with engine speed.

System for controlling the carburetor of an internal combustion engine

Capacitor ignition apparatus for internal-combustion engines with a magneto generator and an ignition pulse generator for the switching through of an electronic switch which discharges the capacitor via the primary winding of the ignition coil, wherein the ignition pulse generator triggered by the magneto generator and provided with a revolution counter effects via a stored ignition characteristics program a revolution-dependent delay of the ignition pulse with respect to the magneto generator pulse.

Capacitor ignition apparatus

The ignition coil of an electronic ignition system, wherein a voltage is induced in the coil by way of a magnet wheel, has an auxiliary coil connected to charge a capacitor by way of a diode. The different voltage of the auxiliary coil and capacitor controls the cut-off of current in the ignition coil.

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Cadolzburg, Germany

Werner Erhard