Ignition system for a two-cycle engine

Claim 2

An ignition system for a two-cycle engine comprising a magnet-type generator having a magnetic field provided with 2n poles (n is an integer of two or more) and housing a capacitorcharging coil and a signal coil therein, said capacitor-charging and signal coils being adapted to cooperate with said magnetic field; a capacitor or capacitors adapted to be charged with the output of said capacitor-charging coil; an ignition coil or coils having a primary coil or coils through which a discharge current will flow when load on said capacitor or capacitors is discharged at predetermined time points; and ignition plug or plugs connected to the secondary coil or coils of said ignition coil or coils; and solid-state-type switch means adapted to be controlled by the output of said signal coil for determining said discharge time points for said capacitor or capacitors; said n being so selected that sparks may be struck from each ignition plug when its associated cylinder is in its predetermined normal ignition position and when the cylinder is in any position on any of its strokes other than the compression stroke.

Claim 3

An ignition system as set forth in claim 1, in which when said engine is a one-cylinder engine, said n is an integer selected from the group comprising 2, 3 and 4.

Claim 4

An ignition system as set forth in claim 1, in which when said engine is a two-cylinder engine, said n is an integer selected from the group comprising 2 and 4.

Claim 5

An ignition system as set forth in claim 1, in which when said engine is a three-cylinder engine, said n is 3.

Claim 6

An ignition system as set forth in claim 1, in which when said engine is a four-cylinder engine, said n is 4.

Claim 7

An ignition system as set forth in claim 1, in which said magnet-type generator houses said capacitor-charging coil and said signal coil in proximity to each other in the interior of said generator.

Claim 8

An ignition system as set forth in claim 1, in which said magnet-type generator comprises a rotor having 2n poles; and a stator having a lighting coil wound on an iron core, a capacitor-charging coil wound on a second iron core and a signal coil wound on a third iron core; said iron core for the capacitor-charging coil and that for said signal coil being disposed in a spaced one-upon-another relation extending axially of said generator.

Claim 9

An ignition system as set forth in claim 7, in which said 2n poles of the rotor comprise 2n magnets disposed in an equally spaced relation along the inner periphery of a cup-shaped flywheel.

Claim 10

An ignition system as set forth in claim 7, in which said 2n poles of the rotor comprise n magnets and n iron pieces which are alternately arranged in an equally spaced relation along the inner periphery of a cup-shaped flywheel.

Claim 11

An ignition system as set forth in claim 1, in which said switch means is a thyristor.

Claim 12

An ignition system as set forth in claim 1, in which the control terminal of said switch means is provided with a means which is adapted to eliminate any abnormal voltage which may be generated in said signal coil.

Claim 13

An ignition system as set forth in claim 11, in which said means for eliminating the abnormal voltage is a Zener diode having an inverse voltage characteristic, said Zener diode being adapted not to break down at said abnormal voltage.

Claim 14

An ignition system as set forth in claim 11, in which said means for eliminating the abnormal voltage is a circuit comprising a capacitor and a resistor in parallel connected to each other.

Claim 15

An ignition system for a two-cycle engine comprising a magnet-type generator which includes a rotor having a magnetic field provided with 2n poles (n is an integer of two or more), a capacitor-charging coil and a signal coil, said capacitor-charging and signal coils being disposed axially of said generator in a spaced one-upon-another relation; a capacitor or capacitors adapted to be charged with the output of said capacitor-charging coil; an ignition coil or coils having a primary coil or coils through which a discharge current flows when the load on said capacitor or capacitors is discharged at predetermined time points; an ignition plug or plugs connected to the secondary plug or plugs of said ignition coil or coils; a thyristor adapted to be controlled by the output of said signal coil fOr determining said predetermined discharge time points for said capacitor or capacitors; and means disposed between the gate of said thyristor and said signal coil for eliminating any abnormal voltage to be induced in the signal coil; said n being so selected that sparks are to be struck from each ignition plug when its associated cylinder is in its predetermined normal sparking position and in any position on its strokes other than its compression stroke.

Claim 16

An ignition system for a two-cycle engine comprising a magnet-type generator which includes a rotor having a magnetic field provided with 2n poles (n is an integer of two or more), a capacitor-charging coil and a signal coil, said capacitor-charging and signal coils being disposed axially of said generator in a spaced one-upon-another relation; a capacitor or capacitors adapted to be charged with the output of said capacitor-charging coil; an ignition coil or coils having a primary coil or coils through which a discharge current flows when the load on said capacitor or capacitors is discharged at predetermined time points; an ignition plug or plugs connected to the secondary plug or plugs of said ignition coil or coils; a thyristor adapted to be controlled by the output of said signal coil fOr determining said predetermined discharge time points for said capacitor or capacitors; and means disposed between the gate of said thyristor and said signal coil for eliminating any abnormal voltage to be induced in the signal coil; said n being so selected that sparks are to be struck from each ignition plug when its associated cylinder is in its predetermined normal sparking position and in any position on its strokes other than its compression stroke.

Claim 17

An ignition system as set forth in claim 14, in which said means for eliminating the abnormal voltage is a Zener diode having an inverse voltage characteristic wherein said Zener diode will not break down at said abnormal voltage.

Claim 18

An ignition system as set forth in claim 14, in which said means for eliminating said abnormal voltage is a circuit comprising a capacitor and a resistor in parallel connected to each other.

Claim 19

An ignition system as set forth in claim 14, in which when said engine is a one-cylinder engine, said n is an integer selected from the group comprising 2, 3 and 4.

Claim 20

An ignition system as set forth in claim 14, in which when said engine is a two-cylinder engine, said n is an integer selected from the group comprising 2 and 4.

Claim 21

An ignition system as set forth in claim 14, in which when said engine is a three-cylinder engine, said n is 3.

Claim 22

An ignition system as set forth in claim 1, in which when said engine is a four-cylinder engine, said n is 4.