Analyzer for internal combustion engines

Claim 1

A MULTI-CYLINDER ENGINE ANALYZER COMPRISING A CATHODE-RAY OSCILLOSCOPE HAVING HORIZONTAL AND VERTICAL DEFLECTION CIRCUITS EACH INCLUDING A SWEEP GENERATOR, A FIRST SYNCHRONIZING MEANS INCLUDING STRUCTURE ROTATING IN SYNCHRONISM WITH THE CRANKSHAFT OF SAID ENGINE AND PRODUCING AN INPUT PULSE FOR TRIGGERING THE HORIZONTAL SWEEP GENERATOR AS EACH PISTON OF SAID ENGINE IN TURN PASSES THROUGH A REFERENCE POSITION IN ITS CYLINDER, A SECOND SYNCHRONIZING MEANS FOR DERIVING FROM A PRESELECTED NUMBER OF THE OUTPUT SIGNALS OF SAID HORIZONTAL SWEEP GENERATOR AN INPUT SIGNAL FOR TRIGGERING THE VERTICAL SWEEP GENERATOR, SAID FIRST AND SECOND SYNCHRONIZING MEANS COOPERATING WITH SAID SWEEP GENERATORS TO PRODUCE A CATHODERAY RASTER WHOSE VERTICALLY SPACED LINES PROVIDE TIME BASES EACH FOR AT LEAST ONE EVENT OCCURRING DURING THE CYCLE OF THE CORRESPONDING PISTON, DETECTOR MEANS RESPECTIVELY ASSOCIATED WITH SAID CYLINDERS AND RESPONSIVE TO SAID EVENTS TO PRODUCE ELECTRICAL SIGNALS APPLIED TO THE VERTICAL DEFLECTION CIRCUIT OF SAID OSCILLOSCOPE FOR APPEARANCE IN THE SUCCESSIVE LINES OF THE RASTER IN CORRELATION TO PISTON REFERENCE POSITION, AND MEANS FOR INJECTING ADDITIONAL PULSES INTO SAID HORIZONTAL DEFLECTION CIRCUIT TO BRING THE RASTER LINE CORRESPONDING WITH A PARTICULAR CYLINDER TO A DESIRED POSITION IN THE RASTER-LINE SEQUENCE.