Ignition timing control system

Claim 2

An ignition timing control system for a spark ignited internal combustion engine having a carburetor throttle valve, said system comprising, in combination, a d.c. voltage source, a thermostatically controlled switch electrically connected to said d.c. voltage source and responsive to the engine temperature, a throttle opening device electrically connected through said thermostatically controlled switch to said d.c. voltage source and opening said carburetor throttle valve when said throttle opening device is energized, a relay electrically connected through said thermostatically controlled switch to said d.c. voltage source, an ignition coil electrically connected to said relay, and a distributor including an advancing breaker point and a retarding breaker point electrically connected to said ignition coil and said relay, said distributor having means responsive to engine speed for effecting ignition timing advance until the engine speed reaches a predetermined level when said thermostatically controlled switch is closed and effecting ignition timing retard when the engine speed exceeds said predetermined level, said thermostatically controlled switch being closed when said engine temperature is below a normal operating level whereby said throttle opening device is energized to open said carburetor throttle valve thereby to increase said engine speed whereas said means of said distributor is operated to effect ignition timing advance until the engine speed reaches said predetermined level and thereafter to effect ignition timing retard for thereby effecting faster warm up of said engine.

Claim 3

An ignition timing control system for a spark ignited internal combustion engine of an automotive vehicle which engine has a carburetor throttle valve, said system comprising in combination, a d.c. voltage source, an ignition switch electrically connected to said d.c. voltage source, a thermostatically controlled switch electrically connected to said ignition switch and responsive to the engine temperature, a neutral switch electrically connected to said thermostatically controlled switch and closed when said automotive vehicle is maintained in its neutral condition, a throttle opening device electrically connected to said d.c. voltage source through said ignition switch, said thermostatically controlled switch and said neutral switch and opening said carburetor throttle valve when said throttle opening device is energized, a relay including a solenoid coil electrically connected in series to said d.c. voltage source through said serially connected switches and a swtich contact associated with said solenoid coil and movable to a closed position when coil is energized, an ignition coil electrically connected to said switch contact of said relay, and a distributor having a retarding breaker point and an advancing breaker point which are electrically connected in parallel to said switch contact of said relay, said distributor having first means to effect ignition timing advance when the engine temperature reaches a normal operating level and second means to effect ignition timing advance until the engine speed reaches a predetermined level when said thermostatically controlled switch is closed and to effect ignition timing retard when the engine speed exceeds said predetermined level, said thermostatically controlled switch being closed when the engine temperature is below said normal operating level for establishing an electric current path between said d.c. voltage source and said ignition coil through said retarding breaker point of said distributor, whereby said second means initially effects ignition timing advance until the engine speed reaches said predetermined level and subsequently effects ignition timing retard when the engine speed exceeds said predetermined level and whereby said throttle opening device is energized to open said carburetor throttle valve to increase said engine speed for effecting faster warm up of said engine.

Claim 4

An ignition timing control system for a spark ignited internal combustion engine of an automotive vehicle which engine has a carburetor throttle valve, said system comprising in combination, a d.c. voltage source, an ignition switch electrically connected to said d.c. voltage source, a thermostatically controlled switch electrically connected to said ignition switch and responsive to the engine temperature, a neutral switch electrically connected to said thermostatically controlled switch and closed when said automotive vehicle is maintained in its neutral condition, a throttle opening device electrically connected to said d.c. voltage source through said ignition switch, said thermostatically controlled switch and said neutral switch and opening said carburetor throttle valve when said throttle opening device is energized, a relay including a solenoid coil electrically connected in series to said d.c. voltage source through said serially connected switches and a swtich contact associated with said solenoid coil and movable to a closed position when coil is energized, an ignition coil electrically connected to said switch contact of said relay, and a distributor having a retarding breaker point and an advancing breaker point which are electrically connected in parallel to said switch contact of said relay, said distributor having first means to effect ignition timing advance when the engine temperature reaches a normal operating level and second means to effect ignition timing advance until the engine speed reaches a predetermined level when said thermostatically controlled switch is closed and to effect ignition timing retard when the engine speed exceeds said predetermined level, said thermostatically controlled switch being closed when the engine temperature is below said normal operating level for establishing an electric current path between said d.c. voltage source and said ignition coil through said retarding breaker point of said distributor, whereby said second means initially effects ignition timing advance until the engine speed reaches said predetermined level and subsequently effects ignition timing retard when the engine speed exceeds said predetermined level and whereby said throttle opening device is energized to open said carburetor throttle valve to increase said engine speed for effecting faster warm up of said engine.

Claim 5

An ignition timing control system for a spark ignited internal combustion engine for an automotive vehicle which engine includes a carburetor throttle valve, said system comprising, in combination, a d.c. voltage source, an ignition switch electrically connected to said voltage source, a thermostatically controlled switch electrically connected to said voltage source through said ignition switch and responsive to the engine temperature, said thermostatically controlled switch being closed when said engine temperature is below a normal opening level, a neutral swtich electrically connected through said serially connected ignition swtich and said thermostatically connected switch to said voltage source, said neutral switch being closed when said automotive vehicle is maintained in a neutral condition, a throttle opening device provided for opening said carburetor throttle valve and including a solenoid coil having one terminal electrically connected through said serially connected ignition switch, said thermostatically controlled switch and said neutral switch to said voltage source and the other terminal connected to the ground, a relay including a solenoid coil connected in series to said voltage source through said serially connected switches and a switch contact associated with said solenoid coil and movable to a closed position when said coil is energized, an ignition coil connected to saiD switch contact, and a distributor having a retarding breaker point and an advancing breaker point connected in parallel to said switch contact, said distributor including a housing, a drive shaft disposed in said housing, a rotary plate fixedly mounted on said rotary plate and rotatable therewith, first and second governor weights pivoted respectively on pivot pins which are fixedly secured to a surface of said rotary plate, first and second tension springs disposed between a retaining pin secured on the surface of said rotary plate and said first and second governor weights respectively, first and second guide pins fixedly mounted on the first and second governor weights respectively, first and second guide members pivotally mounted on a common shaft coaxial with said drive shaft, said first and second guide members having guide slots respectively in which said first and second guide pins are respectively engaged, and first and second distributor cams integrally connected to said first and second guide members respectively, said first distributor cam being associated with said advancing breaker point and said second distributor cam being associated with said retarding breaker point, said first governor weight and said first tension spring being arranged to effect ignition timing advance in dependence on the engine speed, and said first governor weight and said first tension spring being arranged to effect ignition timing advance until the engine speed reaches a predetermined level when said engine temperature is below said normal operating level, and said second governor weight and said second spring being arranged to effect ignition timing retard in dependence on the engine speed after said engine speed reaches said predetermined level.

Claim 6

An ignition timing control system for a spark ignited internal combustion engine for an automotive vehicle which engine includes a carburetor throttle valve, said system comprising, in combination, a d.c. voltage source, an ignition switch electrically connected to said voltage source, a thermostatically controlled switch electrically connected to said voltage source through said ignition switch and responsive to the engine temperature, said thermostatically controlled switch being closed when said engine temperature is below a normal opening level, a neutral swtich electrically connected through said serially connected ignition swtich and said thermostatically connected switch to said voltage source, said neutral switch being closed when said automotive vehicle is maintained in a neutral condition, a throttle opening device provided for opening said carburetor throttle valve and including a solenoid coil having one terminal electrically connected through said serially connected ignition switch, said thermostatically controlled switch and said neutral switch to said voltage source and the other terminal connected to the ground, a relay including a solenoid coil connected in series to said voltage source through said serially connected switches and a switch contact associated with said solenoid coil and movable to a closed position when said coil is energized, an ignition coil connected to saiD switch contact, and a distributor having a retarding breaker point and an advancing breaker point connected in parallel to said switch contact, said distributor including a housing, a drive shaft disposed in said housing, a rotary plate fixedly mounted on said rotary plate and rotatable therewith, first and second governor weights pivoted respectively on pivot pins which are fixedly secured to a surface of said rotary plate, first and second tension springs disposed between a retaining pin secured on the surface of said rotary plate and said first and second governor weights respectively, first and second guide pins fixedly mounted on the first and second governor weights respectively, first and second guide members pivotally mounted on a common shaft coaxial with said drive shaft, said first and second guide members having guide slots respectively in which said first and second guide pins are respectively engaged, and first and second distributor cams integrally connected to said first and second guide members respectively, said first distributor cam being associated with said advancing breaker point and said second distributor cam being associated with said retarding breaker point, said first governor weight and said first tension spring being arranged to effect ignition timing advance in dependence on the engine speed, and said first governor weight and said first tension spring being arranged to effect ignition timing advance until the engine speed reaches a predetermined level when said engine temperature is below said normal operating level, and said second governor weight and said second spring being arranged to effect ignition timing retard in dependence on the engine speed after said engine speed reaches said predetermined level.