Electronic ignition angle measuring apparatus

Claim 2

An electronic ignition angle measuring apparatus for an internal combustion engine including a first pulse generator coupled to the distributor of the engine for generating ignition pulses, and a second pulse generator for generating pulses at a frequency which depends upon the speed of rotation of the engine and in a predetermined phase relationship with respect to top dead center of the cylinders of the engine comprising: signal generating means; first and second signal summing means each comprising an analog integrator, coupled and responsive to said signal generating means; control means including a logic control circuit, coupled to said signal generating means, said first and second summing means, and to the first and second pulse generators, and responsive to a first pulse signal generated by said second pulse generator prior to the generation of an ignition pulse by said first pulse generator so as to activate one of said summing means, to said ignition pulse generated subsequent to the generation of said first pulse signal so as to activate the other of said summing means, and to a second pulse signal generated by said Second pulse generator subsequent to the generation of said first pulse signal within one revolution of the engine crankshaft from the generation of said first pulse signal so as to deactivate both of said first and second summing means, said integrators summing signals transmitted thereto by said signal generating means and said control means, and said control means controlling said summing of said signals; signal dividing means, coupled to said first and second summing means, for generating a signal representative of the ignition angle measured, and including a first integrator coupled to one of said first and second summing means, a comparator coupled to said first integrator and to the other one of said first and second summing means, a second integrator, coupled to said signal generating means and to said indicating means, first switching means coupled to said first and second integrators and said logic control circuit, and second switching means coupled to said signal generating means and said second integrator and responsive to said comparator; means, coupled to said signal dividing means, and responsive to the signal generated thereby, for indicating the ignition angle measured.

Claim 3

The apparatus as recited in claim 1, wherein said indicating means comprises an operational amplifier coupled to said second integrator, a third integrator coupled to said operational amplifier and to said second integrator, and an indicating instrument, coupled and responsive to said third integrator.

Claim 4

The apparatus as recited in claim 1, wherein said control means includes at least one switch, coupled to each of said integrators and said signal generating means, and at least one additional switch coupled to the input and output terminals of each of said integrators and said logic control circuit.

Claim 5

The apparatus as recited in claim 1, wherein said signal generating means comprises a constant voltage source, and wherein each of said integrators comprise a constant voltage integrator.

Claim 6

An electronic ignition angle measuring apparatus for an internal combustion engine including a first pulse generator coupled to the distributor of the engine for generating ignition pulses, and a second pulse generator for generating pulses at a frequency which depends upon the speed of rotation of the engine and in a predetermined phase relationship with respect to top dead center of the cylinders of the engine, comprising; signal generating means; first and second signal summing means each comprising an analog integrator, coupled and responsive to said signal generating means; control means including a logic control circuit, at least one switch, coupled to each of said integrators and said signal generating means, and at least one additional switch coupled to the input and output terminals of each of said integrators and said logic control circuit, said control means being coupled to said signal generating means, said first and second summing means, and to the first and second pulse generators, and being responsive to a first pulse signal generated by said second pulse generator prior to the generation of an ignition pulse by said first pulse generator so as to activate one of said summing means, to said ignition pulse generated subsequent to said first signal so as to activate the other of said summing means, and to a second pulse signal generated by said second pulse generator subsequent to the generation of said first pulse signal within one revolution of the engine crankshaft from the generation of said first pulse signal so as to deactivate both of said first and second summing means, said integrators summing signals transmitted thereto by said signal generating means and said control means, and said control means controlling said summing of said signals, said logic control including a first pulse shaping means coupled to said second pulse generator, and first and second bistable flip-flops coupled in series to said first pulse shaping means, and second pulse shaping means coupled to said first pulse generator, and a third bistable flip-flop coupled to said second pulse shaping means, said flip-flops being coupled to said switches coupled to said integrators for controlling said integrators; signal dividing means, coupled to said first and second summing means, for generating a signal representative of the ignition angle measured; and means, coupled to said signal dividing means, and responsive to the signal generated thereby, for indicating the ignition angle measured.

Claim 7

An electronic ignition angle measuring apparatus for an internal combustion engine including a first pulse generator coupled to the distributor of the engine for generating ignition pulses, and a second pulse generator for generating pulses at a frequency which depends upon the speed of rotation of the engine and in a predetermined phase relationship with respect to top dead center of the cylinders of the engine, comprising; signal generating means; first and second signal summing means each comprising an analog integrator, coupled and responsive to said signal generating means; control means including a logic control circuit, at least one switch, coupled to each of said integrators and said signal generating means, and at least one additional switch coupled to the input and output terminals of each of said integrators and said logic control circuit, said control means being coupled to said signal generating means, said first and second summing means, and to the first and second pulse generators, and being responsive to a first pulse signal generated by said second pulse generator prior to the generation of an ignition pulse by said first pulse generator so as to activate one of said summing means, to said ignition pulse generated subsequent to said first signal so as to activate the other of said summing means, and to a second pulse signal generated by said second pulse generator subsequent to the generation of said first pulse signal within one revolution of the engine crankshaft from the generation of said first pulse signal so as to deactivate both of said first and second summing means, said integrators summing signals transmitted thereto by said signal generating means and said control means, and said control means controlling said summing of said signals, said logic control including a first pulse shaping means coupled to said second pulse generator, and first and second bistable flip-flops coupled in series to said first pulse shaping means, and second pulse shaping means coupled to said first pulse generator, and a third bistable flip-flop coupled to said second pulse shaping means, said flip-flops being coupled to said switches coupled to said integrators for controlling said integrators; signal dividing means, coupled to said first and second summing means, for generating a signal representative of the ignition angle measured; and means, coupled to said signal dividing means, and responsive to the signal generated thereby, for indicating the ignition angle measured.