Contactless capacitor discharge type ignition system for internal combustion engine

Claim 2

A contactless capacitor discharge type ignition system in combination with an internal combustion engine comprising: a magneto generator having a capacitor charging coil for generating alternating current in synchronism with a rotation of an internal combustion engine; recitfying means connected in series with said capacitor charging coil for passing the half wave of said alternating current; a capacitor connected in series with said rectifying means; an ignition coil having a primary winding and a secondary winding, said primary winding being connected in series with said capacitor;

Claim 3

a spark plug connected to said secondary winding and mounted in said internal combustion engine; switching means having a control gate and connected to said capacitor for controlling the discharge of the charge on said capacitor; timing signal generating means for generating a timing signal in synchronism with the rotation of said internal combustion engine, said timing signal including a half wave in a negative direction and a half wave in a positive direction following the half wave in the negative direction; means for delivering the half wave in the positive direction to said control gate of said switching means to drive the same into conduction, so that the stored charge on said capacitor is discharged through said switching means and said primary winding to produce an ignition spark at said spark plug; and control means connected across said timing signal generating means for passing a controlled current in the negative direction through said control means, whereby the half wave in the positive direction is retarded, said control means including a zener diode, a diode and a resistor which are connected in series with each other whereby the spark retard occurs when an operational speed of said internal combustion engine exceeds a predetermined value, and a bypass thyristor connected across said timing signal generating means, the control gate of said bypass thyristor being connected with a juncture between said resistor and said diode.

Claim 4

a spark plug connected to said secondary winding and mounted in said internal combustion engine; switching means having a control gate and connected to said capacitor for controlling the discharge of the charge on said capacitor; timing signal generating means for generating a timing signal in synchronism with the rotation of said internal combustion engine, said timing signal including a half wave in a negative direction and a half wave in a positive direction following the half wave in the negative direction; means for delivering the half wave in the positive direction to said control gate of said switching means to drive the same into conduction, so that the stored charge on said capacitor is discharged through said switching means and said primary winding to produce an ignition spark at said spark plug; and control means connected across said timing signal generating means for passing a controlled current in the negative direction through said control means, whereby the half wave in the positive direction is retarded, said control means including a zener diode, a diode and a resistor which are connected in series with each other whereby the spark retard occurs when an operational speed of said internal combustion engine exceeds a predetermined value, and a bypass thyristor connected across said timing signal generating means, the control gate of said bypass thyristor being connected with a juncture between said resistor and said diode.

Claim 5

A contactless capacitor discharge type ignition system in combination with an internal combustion engine comprising: a magneto generator having a capacitor charging coil for generating alternating current in synchronism with a rotation of an internal combustion engine; rectifying means connected in series with said capacitor charging coil for passing the half wave of said alternating current; a capacitor connected in series with said rectifying means; an ignition coil having a primary winding and a secondary winding, said primary winding being connected in series with said capacitor; a spark plug connected to said secondary winding and mounted in said internal combustion engine; switching means having a control gate and connected to said capacitor for controlling the discharge of the charge on said capacitor; timing signal generating means for generating a timing signal in synchronism with the rotation of said internal combustion engine, said timing signal including a half wave in a negative direction and a half wave in a positive direction following the half wave in the negative direction; means for delivering the half wave in the positive direction to said control gate of said switching means to drive the same into conduction, so that the stored charge on said capacitor is discharged through said switching means and said primary winding to produce an ignition spark at said spark plug; and control means connected across said timing signal generating means for passing a controlled current in the negative direction through said control means, whereby the half wave in the positive direction is retarded, including: a transformer having a primary coil and a secondary coil; a first series circuit of a zener diode, a diode and said primary coil connected across said timing signal generating means; and a second series circuit of a resistor and a bypass thyristor connected across said timing signal generating means, the control gate of said bypass thyristor being connected to said secondary coil.

Claim 6

A contactless capacitor discharge type ignition system in combination with an internal combustion engine comprising: a magneto generator having a capacitor charging coil for generating alternating current in synchronism with a rotation of an internal combustion engine; rectifying means connected in series with said capacitor charging coil for passing the half wave of said alternating current; a capacitor connected in series with said rectifying means; an ignition coil having a primary winding and a secondary winding, said primary winding being connected in series with said capacitor; a spark plug connected to said secondary winding and mounted in said internal combustion engine; switching means having a control gate and connected to said capacitor for controlling the discharge of the charge on said capacitor; timing signal generating means for generating a timing signal in synchronism with the rotation of said internal combustion engine, said timing signal including a half wave in a negative direction and a half wave in a positive direction following the half wave in the negative direction; means for delivering the half wave in the positive direction to said control gate of said switching means to drive the same into conduction, so that the stored charge on said capacitor is discharged through said switching means and said primary winding to produce an ignition spark at said spark plug; and control means connected across said timing signal generating means for passing a controlled current in the negative direction through said control means, whereby the half wave in the positive direction is retarded, including: a transformer having a primary coil and a secondary coil; a first series circuit of a zener diode, a diode and said primary coil connected across said timing signal generating means; and a second series circuit of a resistor and a bypass thyristor connected across said timing signal generating means, the control gate of said bypass thyristor being connected to said secondary coil.

Claim 7

A contactless capacitor discharge type ignition system in combination with an internal combustion engine comprising; a capacitor charging coil connected to a magneto generator driven by said internal combustion engine for generating alternating current in synchronism with a rotation of said internal combustion engine, said alternating current having a positive half wave and a negative half wave, a capacitor connected in series with said capacitor charging coil for storing said positive half wave; an ignition coil having a primary winding and a secondary winding, said primary winding being connected in series with said capacitor; a spark plug connected in series with said secondary winding and mounted in said internal combustion engine; switching means having a control gate and connected to said capacitor for controlling the discharge of the charge on said capacitor; a transformer having a primary coil and a secondary coil, said primary coil being connected across said capacitor charging coil through rectifying means whereby said negative half wave flows through said primary winding; said secondary coil being connected to said control gate of said switching means and generating a timing signal having a half wave in positive direction and a half wave in a negative direction, said half wave in the positive direction following said half wave in the negative direction; timing signal supplying means for supplying said half wave in the positive direction to said control gate of said switching means to drive the same into conduction, whereby the stored charge on said capacitor is discharged through said switching means and said primary winding to produce an ignition spark at said spark plug; and control means connected across said secondary coil for short circuiting said secondary coil whereby the half wave in the positive direction is retarded in phase.

Claim 8

A contactless capacitor discharge type ignition system in combination with an internal combustion engine comprising; a capacitor charging coil connected to a magneto generator driven by said internal combustion engine for generating alternating current in synchronism with a rotation of said internal combustion engine, said alternating current having a positive half wave and a negative half wave, a capacitor connected in series with said capacitor charging coil for storing said positive half wave; an ignition coil having a primary winding and a secondary winding, said primary winding being connected in series with said capacitor; a spark plug connected in series with said secondary winding and mounted in said internal combustion engine; switching means having a control gate and connected to said capacitor for controlling the discharge of the charge on said capacitor; a transformer having a primary coil and a secondary coil, said primary coil being connected across said capacitor charging coil through rectifying means whereby said negative half wave flows through said primary winding; said secondary coil being connected to said control gate of said switching means and generating a timing signal having a half wave in positive direction and a half wave in a negative direction, said half wave in the positive direction following said half wave in the negative direction; timing signal supplying means for supplying said half wave in the positive direction to said control gate of said switching means to drive the same into conduction, whereby the stored charge on said capacitor is discharged through said switching means and said primary winding to produce an ignition spark at said spark plug; and control means connected across said secondary coil for short circuiting said secondary coil whereby the half wave in the positive direction is retarded in phase.

Claim 9

A contactless capacitor discharge type ignition system in combination with an internal combustion engine comprising; a magneto generator including a stator, a rotor rotated in synchronism with rotation of an internal combustion engine, a magnet mounted on said rotor and having a plurality of magnetic poles symmetrically disposed about said rotor for rotation therewith, a trigger magnet mounted on said rotor and rotated in synchronism with the rotation of said internal combustion engine; capacitor charging coil means mounted on said stator adjacent said rotor for generating alternating current in synchronism with the rotation of said internal combustion engine in response to passage of said plurality of magnetic poles past said capacitor charging coil means; capacitor means connected in series with said capacitor charging coil means for storing said alternating current; switching means having a control gate and connected to said capacitor means for controlling the discharge of the charge on said capacitor; an ignition coil having a primary winding connected in series with said capacitor means and said switching means and a secondary winding; a spark plug connected to said secondary winding; trigger coil means mounted on said stator adjacent said trigger magnet for generating a timing signal in response to passage of said trigger magnet past said trigger coil means, said timing signal having a positive half wave and a negative half wave generated prior to said positive half wave; ignition signal supplying means for supplying an ignition signal, when said positive half wave is generated, to said control gate of said switching means to drive the same into conduction, whereby the stored charge on said capacitor means is discharged through said primary winding to produce an ignition spark at said spark plug; and control means connected across said trigger coil means for passing said negative half wave through said control means, whereby the positive half wave is so affected as to retard a spark timing by the current flow by said negative half wave.

Claim 10

A contactless capacitor discharge type ignition system in combination with an internal combustion engine comprising; a magneto generator including a stator, a rotor rotated in synchronism with rotation of an internal combustion engine, a magnet mounted on said rotor and having a plurality of magnetic poles symmetrically disposed about said rotor for rotation therewith, a trigger magnet mounted on said rotor and rotated in synchronism with the rotation of said internal combustion engine; capacitor charging coil means mounted on said stator adjacent said rotor for generating alternating current in synchronism with the rotation of said internal combustion engine in response to passage of said plurality of magnetic poles past said capacitor charging coil means; capacitor means connected in series with said capacitor charging coil means for storing said alternating current; switching means having a control gate and connected to said capacitor means for controlling the discharge of the charge on said capacitor; an ignition coil having a primary winding connected in series with said capacitor means and said switching means and a secondary winding; a spark plug connected to said secondary winding; trigger coil means mounted on said stator adjacent said trigger magnet for generating a timing signal in response to passage of said trigger magnet past said trigger coil means, said timing signal having a positive half wave and a negative half wave generated prior to said positive half wave; ignition signal supplying means for supplying an ignition signal, when said positive half wave is generated, to said control gate of said switching means to drive the same into conduction, whereby the stored charge on said capacitor means is discharged through said primary winding to produce an ignition spark at said spark plug; and control means connected across said trigger coil means for passing said negative half wave through said control means, whereby the positive half wave is so affected as to retard a spark timing by the current flow by said negative half wave.