Capacitor charge-discharge type ignition system for use in a two-cycle internal combustion engine

Claim 2

A breakerless type ignition system for a two-cycle engine comprising a capacitor; a power source for charging said capacitor; ignition coil means having the primary coil through which discharge current from said capacitor flows at a predetermined time and the secondary coil connected to an ignition plug; a first signal source for developing a signal output at said predetermined time; and a first gate controlled rectifier for turning on at said predetermined time under the control of an output of said first signal source to permit discharge current coming from said capacitor to flow through the primary coil of said ignition coil means, said first gate controlled rectifier acting to determine an ignition time point for said engine, characterized in that a second signal source for developing an output having a phase different from that of an output of said first signal source and a second gate controlled rectifier for prevention of rotation in the reverse direction, said first and second signal sources developing signal outputs in one type of sequence when said engine rotates in the forward direction and signal outputs in another type of sequence when said engine rotates in the reverse direction and said second gate controlled rectifier being adapted to turn on when said engine rotates in the reverse direction to nullify said output of the first signal source in cooperation with said second source.

Claim 3

The breakerless type ignition system for a two-cycle engine as set forth in claim 1, in which said second gate controlled rectifier is disposed in a parallel connection relationship with respect to said first signal source, said first and second signal sources are so arranged that when said engine rotates in the forward direction the phase of an output of said first signal source is in advance of that of an output of said second signal source and when the engine tends to rotate in the reverse direction the phase of an output of said first signal source lags behind that of an output of said second signal source and said second gate controlled rectifier is turned on with an output signal of said second signal source thereby to short-circuit the output of said first signal source.

Claim 4

The breakerless type ignition system for a two-cycle engine as set forth in claim 1, in which said first and second signal sources are first and second signal armature coils disposed within a common magnet type AC generator which rotates in synchronism with said engine and cooperate with a common magnetic field.

Claim 5

The breakerless type ignition system for a two-cycle engine as set forth in claim 1, in which said power source for charging said capacitor is an armature coil of a magnet type AC generator which rotates in synchronism with said engine.

Claim 6

The breakerless type ignition system for a two-cycle engine as set forth in claim 4, in which said first and second signal sources are first and second signal armature coils disposed within said magnet type AC generator together with said charging armature coil and said three armature coils cooperate with a common magnetic field.

Claim 7

The breakerless type ignition system fo a two-cycle engine as set forth in claim 1, in which said power source for charging said capacitor comprises a combination of a battery and a DC-AC converter.

Claim 8

A breakerless type ignition system for a two-cycle engine comprising a capacitor; a power source for charging said capacitor; ignition coil means having the primary coil through which discharge current from said capacitor flows at a predetermined time and the secondary coil connected to an ignition plug; a first signal source for developing a signal output at said predetermined time; and a first gate controlled rectifier for turning on at said predetermined time under the control of an output of said first signal source thereby to permit discharge current coming from said capacitor to flow through said primary coil of the ignition coil means, said first gate controlled rectifier acting for determining an ignition time point for said engine, characterized in that a second signal source for developing a signal output the phase of which leads that of an output of said first signal source when said engine rotates in the forward direction and lags the phase of an output of the first signal source when the engine tends to rotate in the reverse direction and a second gate controlled rectifier connected in series with said first signal source to be controlled by an output of said second signal source, said second gate controlled rectifier acting for preventing said engine from rotating in the reverse direction, said second gate controlled rectifier being adapted to turn on with an output of said second signal source when said engine rotates in the forward direction whereby said first signal source effectively acts on the ignition circuit for said first gate controlled rectifier and the first gate controlled rectifier will not turn on when the engine tends to rotate in the reverse direction.

Claim 9

A breakerless type ignition system for a two-cycle engine comprising a capacitor; a power source for charging said capacitor; ignition coil means having the primary coil through which discharge current from said capacitor flows at a predetermined time and the secondary coil connected to an ignition plug; a first signal source for developing a signal output at said predetermined time; and a first gate controlled rectifier for turning on at said predetermined time under the control of an output of said first signal source thereby to permit discharge current coming from said capacitor to flow through said primary coil of the ignition coil means, said first gate controlled rectifier acting for determining an ignition time point for said engine, characterized in that a second signal source for developing a signal output the phase of which leads that of an output of said first signal source when said engine rotates in the forward direction and lags the phase of an output of the first signal source when the engine tends to rotate in the reverse direction and a second gate controlled rectifier connected in series with said first signal source to be controlled by an output of said second signal source, said second gate controlled rectifier acting for preventing said engine from rotating in the reverse direction, said second gate controlled rectifier being adapted to turn on with an output of said second signal source when said engine rotates in the forward direction whereby said first signal source effectively acts on the ignition circuit for said first gate controlled rectifier and the first gate controlled rectifier will not turn on when the engine tends to rotate in the reverse direction.

Claim 10

The breakerless ignition system for a two-cycle engine as set forth in claim 7, in which said first and second signal sources are first and second signal armature coils disposed within a common magnet type AC generator which rotates in synchronism with said engine and said first and second signal armature coils cooperate with a common magnetic field.

Claim 11

The breakerless type ignition system for a two-cycle engine as set forth in claim 7, in which said power source for charging said capacitor is an armature coil of said magnet type AC generator which rotates in synchronism with said engine.

Claim 12

The breakerless type ignition system for a two-cycle engine as set forth in claim 9, in which said first and second signal sources are first and second signal armature coils disposed within said magnet type AC generator together with said charging armature coil and cooperating with a common magnetic field.

Claim 13

The breakerless type ignition system for a two-cycle engine as set forth in claim 7, in which said power source for charging said capacitor comprises a combination of a battery and a DC-AC converter.

Claim 14

The breakerless type ignition system for a two-cycle engine comprising a capacitor; a power source for charging said capacitor; ignition coil means having the primary winding through which discharge current from said capacitor flows at a predetermined time and the secondary winding connected to an ignition plug; a first signal source for developing a signal output at said predetermined time; and a gate controlled rectifier for turning on at said predetermined time under the control of an output of said first signal source thereby to permit discharge current coming from said capacitor to flow through said primary coil of the ignition coil means, said gate controlled rectifier acting for determining an ignition time point for said engine, characterized in that a first auxiliary gate controlled rectifier connected in parallel to the output of said capacitor charging power source; a second auxiliary gate controlled rectifier connected between the gate and cathode of said first auxiliary gate controlled rectifier; means for supplying ignition current from said power source to said first auxiliary gate controlled rectifier to ignite said first auxiliary gate controlled rectifier; and a second signal source for developing an output the phase of which leads that of an output of said power source when said engine rotates in the forward direction and for developing an output the phase of which lags that of an output of the power source when the engine tends to rotate in the reverse direction and in which an output of said second signal source is applied across the gate and cathode of said second auxiliary gate controlled rectifier and when said engine rotates in the forward direction said second auxiliary gate controlled rectifier is turned on with an output of said second signal source whEreby said first auxiliary gate controlled rectifier is prevented from turning on whereas when said engine tends to rotate in the reverse direction said second auxiliary gate controlled rectifier is prevented from turning on whereby said first auxiliary gate controlled rectifier is turned on with an output of said first signal source so that charging of said capacitor by said power source is prevented.

Claim 15

The breakerless type ignition system for a two-cycle engine comprising a capacitor; a power source for charging said capacitor; ignition coil means having the primary winding through which discharge current from said capacitor flows at a predetermined time and the secondary winding connected to an ignition plug; a first signal source for developing a signal output at said predetermined time; and a gate controlled rectifier for turning on at said predetermined time under the control of an output of said first signal source thereby to permit discharge current coming from said capacitor to flow through said primary coil of the ignition coil means, said gate controlled rectifier acting for determining an ignition time point for said engine, characterized in that a first auxiliary gate controlled rectifier connected in parallel to the output of said capacitor charging power source; a second auxiliary gate controlled rectifier connected between the gate and cathode of said first auxiliary gate controlled rectifier; means for supplying ignition current from said power source to said first auxiliary gate controlled rectifier to ignite said first auxiliary gate controlled rectifier; and a second signal source for developing an output the phase of which leads that of an output of said power source when said engine rotates in the forward direction and for developing an output the phase of which lags that of an output of the power source when the engine tends to rotate in the reverse direction and in which an output of said second signal source is applied across the gate and cathode of said second auxiliary gate controlled rectifier and when said engine rotates in the forward direction said second auxiliary gate controlled rectifier is turned on with an output of said second signal source whEreby said first auxiliary gate controlled rectifier is prevented from turning on whereas when said engine tends to rotate in the reverse direction said second auxiliary gate controlled rectifier is prevented from turning on whereby said first auxiliary gate controlled rectifier is turned on with an output of said first signal source so that charging of said capacitor by said power source is prevented.

Claim 16

The breakerless type ignition system for a two-cycle engine as set forth in claim 12, in which said power source is an armature coil of a magnet type AC generator which rotates in synchronism with said engine and said first and second signal sources are first and second signal armature coils disposed within said AC generator which three armature coils cooperate with a common magnetic field.