Analyzer for internal combustion engines

Claim 1

AN ENGINE-ANALZER FOR SELECTIVELY DISPLAYING THE PRESSURE/CYCLE-TIME CHARACTERISTIC OF A SELECTED CYLINDER OF AN ENGINE UNDER TEST AND THE REFERENCE-PRESSURE-CYCLETIME RELATIONSHIP BETWEEN DIFFERENT CYLINDER OF AN ENGINE COMPRISING A CATHODE-RAY TUBE, MEANS INCLUDING A SWEEP GENERATOR SYCHRONIZED WITH THE CYLINDER CYCLES FOR REPEATED SWEEPING THE CATHODE-RAY BEAM IN A HORIZONTAL PATH, AN OSCILLATOR COUPLED TO THE CATHODE OF SAID CATHODERAY TUBE AND NORMALLY IN A STATE CORRESPONDING WITH SUPPRESSED VISIBILITY OF THE CATHODE-RAY BEAM, AN ELECTRONIC RELAY NORMALLY BIASED TO CUT-OFF AND COUPLED TO THE VERTICAL-DEFLECTION CIRCUIT OF SAID CATHODE-RAY TUBE, PRESSURERESPONSVIE SWITCHES EACH RESPONSIVE TO CYLINDER PRESSURES IN EXCESS OF SELECTED REFERENCE-PRESSURE, A DISPLAY SELECTOR SWITCH EFFECTIVE IN A FIRST POSITION TO CONNECT ANY SELECTED ONE OF SAID PRESSURE-RESPONSIVE SWITCHES TO SAID OSCILLATOR TO CHANGE ITS STATE FOR VISIBILITY OF SAID BEAM DURING CYLINDER-CYCLE INTERVALS OF EXCESS PRESSURE AND EFFECTIVE IN A SECOND POSITION TO CONNECT A SELECTED NUMBER OF SAID PRESSURE-RESPONSIVE SWITCHES TO SAID RELAY FOR DISABLING ITS CUT-OFF BIAS DURING CYLINDER-CYCLE INTERVALS OF EXCESS CYLINDER-PRESSURE, MEANS OPERATED WITH SAID DISPLAY-SELECTOR SWITCH IN SAID FIRST POSITION TO EFFECT INCREMENTAL CHANGES OF SAID REFERENCE-PRESSURE AND CORRESPONDING VERTICAL SHIFTS OF SAID BEAM PATH TO PRODUCE AN INDICATOR-CARD DISPLAY OF THE PRESSURE/CYCLE-TIME CHARACTERISTIC OF THE ONE SELECTED CYLINDER,AND MEANS INCLUDING A VERTICAL SWEEP GENERATOR SYNCHRONIZED WITH THE ENGINE CYCLE AND EFFECTIVE FOR SAID SECOND POSITION OF THE DISPLAY SELECTOR SWITCH AND A SINGLE SELECTED REFERENCE-PRESSURE TO PRODUCE A RASTER WHOSE VERTICALLY SPACED LINES RESPECTIVELY CORRESPOND WITH THE SELECTED CYLINDERS AND WHICH DISPLAYS THE INTERVALS FOR WHICH THEIR PRESSURES EXCEED THE REFERENCE-PRESSURE.