Ignition system for rotary internal combustion engine

Claim 2

In an ignition system for a rotary internal combustion engine including an ignition switch, two ignition coils each having a primary winding and a secondary winding, two breakers each connected to the respective primary winding of each of the ignition coils, a spark plug for normally igniting a combustible air-fuel mixture in each consecutive compression chamber of the engine, a distributor for selectively connecting the secondary windings of the ignition coils to the spark plug to cause a spark to be incident to the opening of the breakers, and cams driven by the engine for opening the breakers, the improvement comprising an electromechanical switch member connected between one of the ignition coils and the ignition switch and responding to deceleration and idling conditions of the engine for controlling the firing of the spark plug to produce a spark in alternate compression cycles, in which the electromechanical switch member for controlling the firing of the spark plug comprises a first normally closed switch connected between the ignition switch and one of the ignition coils, and a second normally closed switch connected in parallel with the first switch, the first switch being opened when the degree of throttle opening is of such a value as when the engine is idling, the second switch being opened when engine speed exceeds a predetermined value.

Claim 3

An ignition system as claimed in claim 1, in which the first switch is operatively connected through a mechanical linkage with the throttle valve.

Claim 4

An ignition system as claimed in claim 1, in which the second switch is opened by a solenoid which is actuated by a relay switch, the relay switch being closed by an electromagnet connected to a magneto which is driven by the engine drive shaft.

Claim 5

In an ignition system for a rotary internal combustion engine including an ignition switch, an ignition coil having a primary winding and a secondary winding, a breaker connected to the primary winding of the ignition coil, a spark plug for normally igniting a combustible air-fuel mixture in each consecutive compression chamber of the engine, a distributor for selectively connecting the secondary winding of the ignition coil to the spark plug to cause the production of spark at the spark plug to be incident to the opening of the breaker, and cams driven by the engine for opening the breaker, the improvement comprising an electromechanical switch meMber connected between the ignition coil and the breaker and responsive to certain decelerating and idling conditions of engine for controlling the firing of the spark plug to produce a spark in alternate compression cycles, in which the electromechanical switch member for controlling the firing of the spark plug comprises a normally closed switch connected between the ignition coil and the ignition switch, the switch being opened in response to engine decleration, an auxiliary breaker connected in parallel with the switch, and a cam driven by the engine for opening the auxiliary breaker in alternate openings of the breaker, in which the cam for opening the breaker is a cam having two opposed lobes, and the cam for opening the auxiliary breaker is a cam having a single lobe, the single lobe being angularly aligned with the opposed lobes of the breaker cam.

Claim 6

In an ignition system for a rotary internal combustion engine including an ignition switch, an ignition coil having a primary winding and a secondary winding, a breaker connected to the primary winding of the ignition coil, a spark plug for normally igniting a combustible air-fuel mixture in each consecutive compression chamber of the engine, a distributor for selectively connecting the secondary winding of the ignition coil to the spark plug to cause the production of spark at the spark plug to be incident to the opening of the breaker, and cams driven by the engine for opening the breaker, the improvement comprising an electromechanical switch meMber connected between the ignition coil and the breaker and responsive to certain decelerating and idling conditions of engine for controlling the firing of the spark plug to produce a spark in alternate compression cycles, in which the electromechanical switch member for controlling the firing of the spark plug comprises a normally closed switch connected between the ignition coil and the ignition switch, the switch being opened in response to engine decleration, an auxiliary breaker connected in parallel with the switch, and a cam driven by the engine for opening the auxiliary breaker in alternate openings of the breaker, in which the cam for opening the breaker is a cam having two opposed lobes, and the cam for opening the auxiliary breaker is a cam having a single lobe, the single lobe being angularly aligned with the opposed lobes of the breaker cam.