초록 ▼

At higher engine speeds the ignition time is advanced by decreasing the time between the breakdown of a threshold element which breaks down for a predetermined amplitude of voltage across the primary winding of the ignition coil and the furnishing of the signal which causes interruption of the prima

At higher engine speeds the ignition time is advanced by decreasing the time between the breakdown of a threshold element which breaks down for a predetermined amplitude of voltage across the primary winding of the ignition coil and the furnishing of the signal which causes interruption of the primary current. The time is shortened either by decreasing the time constant of the timing circuit connected to the threshold element, or by switching a second timing circuit having a shorter time constant into the circuit at higher engine speeds.

대표청구항 ▼

In an ignition system for an internal combustion engine, said ignition system having a rotating magneto system driven by said engine and armature means including a primary winding (13a) and a secondary winding (13b) cooperating with said rotating magneto system, a spark plug connected to said second

In an ignition system for an internal combustion engine, said ignition system having a rotating magneto system driven by said engine and armature means including a primary winding (13a) and a secondary winding (13b) cooperating with said rotating magneto system, a spark plug connected to said secondary winding, and ignition starting means (16) connected to said primary winding for starting the ignition process in response to an ignition timing signal: timing means (28, 20) connected to said primary winding and said ignition starting means, for furnishing said ignition starting signal to said ignition starting means at first predetermined instants in the cycle of said engine when said engine is operating at a speed less than a predetermined speed, and at second time instants preceding said first time instants in each cycle of said engine when said engine is operating at a speed exceeding said predetermined speed, said timing means comprising threshold means (22) for furnishing a first threshold signal when the voltage across said primary winding exceeds a first predetermined voltage; time constant furnishing means (31, 30, 24, 23) connected to said threshold means for furnishing said ignition starting signal a predetermined time period following receipt of said first threshold signal; switch means (29; 41) having a first and second stable state, connected to said time constant furnishing means, for shortening said predetermined time period when in said second stable state; and connecting means for connecting said switch means to said primary in such a manner that said switch means switches from said first to said second stable state prior to the ignition time when the speed of said engine exceeds said predetermined speed.