Internal combustion engine speed limiting circuit

Claim 2

An internal combustion engine speed limiting circuit comprising in combination with conventional ignition distributor breaker contacts connected in series with the primary winding of an ignition coil across a source of direct current potential and operated to the eletrical circuit open and closed conditions in timed relationship with the engine, means for producing a direct current engine speed potential signal which increases linearly in magnitude with engine speed, means for producing a direct current sawwooth waveform potential signal having a substantially constant maximum potential, means responsive to said engine speed potential signal and said sawtooth waveform potential signal for producing an output direct current control potential signal while the magnitude of said engine speed potential signal exceeds the magnitude of said sawtooth waveform potential signal, electrical switch means having normally open current carrying elements connected in shunt across said ignition distributor breaker contacts and a control element responsive to an electrical signal for operating said normally open current carrying elements to the electrical circuit closed condition, and means for applying said control potential signal to said control element of said electrical switch means.

Claim 3

An internal combustion engine speed limiting circuit comprising in combination with conventional ignition distributor breaker contacts connected in series with the primary winding of an ignition coil across a source of direct current potential and operated to the electrical circuit open and closed conditions in timed relationship with the engine, means for producing a direct current engine speed potential signal which increass linearly in magnitude with engine speed, means for producing a direct current sawtooth waveform potential signal having a substantially constant maximum potential, an operational amplifier responsive to said engine speed potential signal and said sawtooth waveform potential signal for producing an output direct current control potential signal while the magnitude of said engine speed potential signal exceeds the magnitude of said sawtooth waveform potential signal, electrical switch means having normally open current carrying elements connected in shunt across said ignition distributor breaker contacts and a control element responsive to an electrical Signal for operating said normally open current carrying elements to the electrical circuit closed condition, and means for applying said control potential signal to said control element of said electrical switch means.

Claim 4

An internal combustion engine speed limiting circuit comprising in combination with conventional ignition distributor breaker contacts connected in series with the primary winding of an ignition coil across a source of direct current potential and operated to the electrical circuit open and closed conditions in timed relationship with the engine, means for producing a direct current engine speed potential signal which increass linearly in magnitude with engine speed, means for producing a direct current sawtooth waveform potential signal having a substantially constant maximum potential, an operational amplifier responsive to said engine speed potential signal and said sawtooth waveform potential signal for producing an output direct current control potential signal while the magnitude of said engine speed potential signal exceeds the magnitude of said sawtooth waveform potential signal, electrical switch means having normally open current carrying elements connected in shunt across said ignition distributor breaker contacts and a control element responsive to an electrical Signal for operating said normally open current carrying elements to the electrical circuit closed condition, and means for applying said control potential signal to said control element of said electrical switch means.

Claim 5

An internal combustion engine speed limiting circuit comprising in combination with conventional ignition distributor breaker contacts connected in series with the primary winding of an ignition coil across a source of direct current potential and operated to the electrical circuit open and closed conditions in timed relationship with the engine, means for producing a direct current engine speed potential signal which increases linearly in magnitude with engine speed, means for producing a direct current sawtooth waveform potential signal having a substantially constant maximum potential, an operational amplifier responsive to said engine speed potential signal and said sawtooth waveform potential signal for producing an output direct current control potential signal while the magnitude of said engine speed potential signal exceeds the magnitude of said sawtooth waveform potential signal, a silicon controlled rectifier having anode and cathode electrodes connected in shunt across said ignition distributor breaker contacts and a gate electrode, and means for applying said control potential signal across said gate-cathode electrodes of said silicon controlled rectifier.

Claim 6

An internal combustion engine speed limiting circuit comprising in combination with conventional ignition distributor breaker contacts connected in series with the primary winding of an ignition coil across a source of direct current potential and operated to the electrical circuit open and closed conditions in timed relationship with the engine, means for producing a direct current engine speed potential signal which increases linearly in magnitude with engine speed, means for producing a direct current sawtooth waveform potential signal having a substantially constant maximum potential, an operational amplifier responsive to said engine speed potential signal and said sawtooth waveform potential signal for producing an output direct current control potential signal while the magnitude of said engine speed potential signal exceeds the magnitude of said sawtooth waveform potential signal, a silicon controlled rectifier having anode and cathode electrodes connected in shunt across said ignition distributor breaker contacts and a gate electrode, and means for applying said control potential signal across said gate-cathode electrodes of said silicon controlled rectifier.

Claim 7

An internal combustion engine speed limiting circuit comprising in combination with conventional ignition distributor breaker contacts connected in series with the primary winding of an ignition coil across a source of direct current potential and operated to the electrical circuit open and closed conditions in timed relationship with the engine, means for producing a series of direct current square waveform potential signals of a substantially constant predetermined potential, means for producing a direct current engine speed potential signal which increases linearly in magnitude with engine speed, means responsive to said series of square waveform potential signals for producing a direct current sawtooth waveform potential signal having a substantially constant maximum potential, an operational amplifier having an inverting input circuit and a non-inverting input circuit responsive to said engine speed potential signal and said sawtooth waveform potential signal for producing an output direct current control potential signal while the magnitude of said engine speed potential signal exceeds the magnitude of said sawtooth waveform potential signal, means for applying said sawtooth waveform potential signal to said inverting input circuit of said operational amplifier, means for applying said engine speed potential signal to said non-inverting input circuit of said operational amplifier, a silicon controlled rectifier having anode and cathode electrodes connected in shunt across said ignition distributor breaker contacts and a gate electrode, and means for applying said control potential signal across said gate-cathode electrodes of said silicon controlled rectifier.

Claim 8

An internal combustion engine speed limiting circuit comprising in combination with conventional ignition distributor breaker contacts connected in series with the primary winding of an ignition coil across a source of direct current potential and operated to the electrical circuit open and closed conditions in timed relationship with the engine, means for producing a series of direct current square waveform potential signals of a substantially constant predetermined potential, means for producing a direct current engine speed potential signal which increases linearly in magnitude with engine speed, means responsive to said series of square waveform potential signals for producing a direct current sawtooth waveform potential signal having a substantially constant maximum potential, an operational amplifier having an inverting input circuit and a non-inverting input circuit responsive to said engine speed potential signal and said sawtooth waveform potential signal for producing an output direct current control potential signal while the magnitude of said engine speed potential signal exceeds the magnitude of said sawtooth waveform potential signal, means for applying said sawtooth waveform potential signal to said inverting input circuit of said operational amplifier, means for applying said engine speed potential signal to said non-inverting input circuit of said operational amplifier, a silicon controlled rectifier having anode and cathode electrodes connected in shunt across said ignition distributor breaker contacts and a gate electrode, and means for applying said control potential signal across said gate-cathode electrodes of said silicon controlled rectifier.

Claim 9

An internal combustion engine speed limiting circuit comprising in combination with conventional ignition distributor breaker contacts connected in series with the primary winding of an ignition coil across a source of direct current potential and operated to the electrical circuit open and closed conditions in timed relationship with the engine, means for producing a direct current reference potential of a substantially constant predetermined magnitude, means for producing a series of direct current square waveform potential signals of a substantially constant potential, means for producing a direct current engine speed potential signal which increases linearly in magnitude with engine speed, means responsive to said series of square waveform potential signals for producing a direct current sawtooth waveform potential signal having a substantially constant maximum potential, first and second resistors, a capacitor, means for appLying said square waveform potential signals across the series combination of one of said resistors and said capacitor, means for applying said reference potential across the series combination of the other one of said resistors and said capacitor, an operational amplifier having an inverting input circuit and a non-inverting input circuit responsive to said engine speed potential signal and said sawtooth waveform potential signal for producing an output direct current control potential signal while the magnitude of said engine speed potential signal exceeds the magnitude of said sawtooth waveform potential signal, means for connecting the junction between said capacitor and said two resistors to said inverting input circuit of said operational amplifier, means for applying said engine speed potential signal to said non-inverting input circuit of said operational amplifier, a silicon controlled rectifier having anode and cathode electrodes connected in shunt across said ignition distributor breaker contacts and a gate electrode, and means for applying said control potential signal across said gate-cathode electrodes of said silicon controlled rectifier.

Claim 10

An internal combustion engine speed limiting circuit comprising in combination with conventional ignition distributor breaker contacts connected in series with the primary winding of an ignition coil across a source of direct current potential and operated to the electrical circuit open and closed conditions in timed relationship with the engine, means for producing a direct current reference potential of a substantially constant predetermined magnitude, means for producing a series of direct current square waveform potential signals of a substantially constant potential, means for producing a direct current engine speed potential signal which increases linearly in magnitude with engine speed, means responsive to said series of square waveform potential signals for producing a direct current sawtooth waveform potential signal having a substantially constant maximum potential, first and second resistors, a capacitor, means for appLying said square waveform potential signals across the series combination of one of said resistors and said capacitor, means for applying said reference potential across the series combination of the other one of said resistors and said capacitor, an operational amplifier having an inverting input circuit and a non-inverting input circuit responsive to said engine speed potential signal and said sawtooth waveform potential signal for producing an output direct current control potential signal while the magnitude of said engine speed potential signal exceeds the magnitude of said sawtooth waveform potential signal, means for connecting the junction between said capacitor and said two resistors to said inverting input circuit of said operational amplifier, means for applying said engine speed potential signal to said non-inverting input circuit of said operational amplifier, a silicon controlled rectifier having anode and cathode electrodes connected in shunt across said ignition distributor breaker contacts and a gate electrode, and means for applying said control potential signal across said gate-cathode electrodes of said silicon controlled rectifier.

Claim 11

An internal combustion engine speed limiting circuit comprising in combination with conventional ignition distributor breaker contacts connected in series with the primary winding of an ignition coil across a source of direct current potential and operated to the electrical circuit open and closed conditions in timed relationship with the engine, means for producing a direct current reference potential of a substantially constant predetermined magnitude, means for producing a series of direct current square waveform potential signals of a substantially constant potential, means for producing a direct current engine speed potential signal which increases linearly in magnitude with engine speed, means responsive to said series of square waveform potential signals for producing a direct current sawtooth waveform potential signal having a substantially constant maximum potential, first and second resistors, a capacitor, means for applying said square waveform potential signals across the series combination of one of said resistors and said capacitor, means for applying said reference potential across the series combination of the other one of said resistors and said capacitor, a diode having anode and cathode electrodes, means for applying said square waveform potential signals to said anode electrode of said diode and said reference potential to said cathode electrode of said diode, an operational amplifier having an inverting input circuit and a non-inverting input circuit responsive to said engine speed potential signal and said sawtooth waveform potential signal for producing an output direct current control potential signal while the magnitude of said engine speed potential signal exceeds the magnitude of said sawtooth waveform potential signal, means for connecting the junction between said capacitor and said two resistors to said inverting input circuit of said operational amplifier, means for applying said engine speed potential signal to said non-inverting input circuit of said operational amplifier, a silicon controlled rectifier having anode and cathode electrodes connected in shunt across said ignition distributor breaker contacts and a gate electrode, and means for applying said control potential signal across said gate-cathode electrodes of said silicon controlled rectifier.

Claim 12

An internal combustion engine speed limiting circuit comprising in combination with conventional ignition distributor breaker contacts connected in series with the primary winding of an ignition coil across a source of direct current potential and operated to the electrical circuit open and closed conditions in timed relationship with the engine, means for producing a direct current reference potential of a substantially constant predetermined magnitude, means for producing a series of direct current square waveform potential signals of a substantially constant potential, means for producing a direct current engine speed potential signal which increases linearly in magnitude with engine speed, means responsive to said series of square waveform potential signals for producing a direct current sawtooth waveform potential signal having a substantially constant maximum potential, first and second resistors, a capacitor, means for applying said square waveform potential signals across the series combination of one of said resistors and said capacitor, means for applying said reference potential across the series combination of the other one of said resistors and said capacitor, a diode having anode and cathode electrodes, means for applying said square waveform potential signals to said anode electrode of said diode and said reference potential to said cathode electrode of said diode, an operational amplifier having an inverting input circuit and a non-inverting input circuit responsive to said engine speed potential signal and said sawtooth waveform potential signal for producing an output direct current control potential signal while the magnitude of said engine speed potential signal exceeds the magnitude of said sawtooth waveform potential signal, means for connecting the junction between said capacitor and said two resistors to said inverting input circuit of said operational amplifier, means for applying said engine speed potential signal to said non-inverting input circuit of said operational amplifier, a silicon controlled rectifier having anode and cathode electrodes connected in shunt across said ignition distributor breaker contacts and a gate electrode, and means for applying said control potential signal across said gate-cathode electrodes of said silicon controlled rectifier.