Electrical measuring device for the analysis of exhaust gases of internal combustionengines

• US 3,284,165 A
• Filed: 09/11/1964
• Issued: 11/08/1966
• Est. Priority Date: 09/12/1963
• Status: Expired due to Term

• Current Assignee: Gunther Baumann, Hans Zeller, Hermann Scholl, Josef Wahl, Wolfgang Reichardt
• Original Assignee: Gunther Baumann, Hans Zeller, Hermann Scholl, Josef Wahl, Wolfgang Reichardt
• Inventors: GUNTHER BAUMANN, HERMANN SCHOLL, WOLFGANG REICHARDT, Zeller, Hans, Wahl, Josef
• Application Number:
  US04/395,760
• Time in Patent Office: 788 Days
• US Class Current: 422/96
• CPC Class Codes: G01N 27/16 caused by burning or catalytic oxidation of surrounding material to be tested, e.g. of gas

Claims

1. AN ELECTRICAL ANALYZER OF EXHAUST GASES OF AN INTERNAL COMBUSTION ENGINE, COMPRISING, IN COMBINATION, MEASURING HEAD MEANS COMPRISING TWO SEPARATE COMPARTMENTS;

TUBULAR CONDUIT MEANS SECURED AT ONE END TO SAID MEASURING HEAD MEANS COMMUNICATING WITH ONE OF SAID COMPARTMENTS THEREIN, SAID TUBULAR CONDUIT MEANS BEING INSERTED AT ITS OTHER END INTO THE EXHAUST PIPE OF AN INTERNAL COMBUSTION ENGINE AND CAUSING EXHAUST GASES THEREFROM TO STREAM INTO AND THROUGH SAID ONE COMPARTMENT;

FIRST RESISTOR MEANS INCLUDING A MEASURING RESISTOR COMPRISING A PLATINUM WIRE POSITIONED IN SAID ONE COMPARTMENT AND HEATED BY PASSAGE OF AN ELECTRIC CURRENT THERETHROUGH SO AS TO ASSUME A PREDETERMINED RESISTANCE AND TEMPERATURE AND THEREBY TO IGNITE COMBUSTIBLE COMPONENTS OF SAID EXHAUST GASES ENTERING SAID ONE COMPARTMENT, THE BURNING OF SUCH COMBUSTIBLE COMPONENTS IN TURN ADDITIONALLY HEATING SAID MEASURING RESISTOR AND THEREBY CHANGING THE PREDETERMINED RESISTANCE THEREOF;

SECOND RESISTOR MEANS INCLUDING A REFERENCE RESISTOR CONSTITUTED BY A PLATINUM WIRE POSITIONED IN THE OTHER OF SAID COMPARTMENTS AND HEATED BY ELECTRIC CURRENT PASSING THERETHROUGH TO ASSUME A SUBSTANTIALLY CONSTANT REFERENCE RESISTANCE;

A SOURCE OF ELECTRIC ENERGY FOR SUPPLYING ELECTRICAL ENERGY, SAID SOURCE HAVING TWO TERMINALS OF OPPOSITE PLURALITY;

AND ELECTRIC CIRCUIT MEANS INCLUDING A BRIDGE CIRCUIT COMPRISING A MULTI-LEAD CONNECTION ENTERING AT ONE END THEREOF SAID MEASURING HEAD MEANS AND CONNECTING SAID MEASURING RESISTOR IN SAID ONE COMPARTMENT AND SAID REFERENCE RESISTOR IN SAID OTHER COMPARTMENT AS TWO BRANCHES OF SAID BRIDGE CIRCUIT, SAID ELECTRIC CIRCUIT MEANS COMPRISING AT LEAST TWO SUPPLEMENTARY RESISTORS CONNECTED IN TWO OTHER BRANCHES OF SAID BRIDGE CIRCUIT, AN ELECTRIC CIRCUIT MEASURING INSTRUMENT CONNECTED AS A DIAGONAL OF SAID BRIDGE CIRCUIT, SAID MULTILEAD CONNECTION CONNECTING SAID MEASURING AND REFENCE RESISTORS WITH THE REMAINDER OF SAID BRIDGE CIRCUIT, SAID ELECTRIC MEASURING INSTRUMENT BEING CONNECTED IN SAID BRIDGE CIRCUIT IN A MANNER WHEREBY IT MEASURES AND INDICATES A CHANGE OF RESISTANCE OF SAID MEASURING RESISTOR RELATIVE TO THE SUBSTANTIALLY CONSTAND RESISTANCE OF SAID REFERENCE RESISTOR DURING PASSAGE OF SAID EXHAUST GASES THROUGH SAID COMPARTMENT, SUCH CHANGE OF RESISTANCE BEING AN INDICATION OF THE PROPORTION BETWEEN COMBUSTIBLE COMPONENTS AND NON-COMBUSTIBLE COMPONENTS OF SAID EXHAUST TWEEN SAID BRIDGE CIRCUIT AND SAID SOURCE OF ELECTLRIC ENERGY FOR KEEPING THE VOLTAGE APPLIED TO SAID MEASURING AND REFERENCE RESISTORS FROM SAID SOURCE OF ELECTRIC ENERGY SUBSTANTIALLY CONSTANT WHEN THE OUTPUT VOLTAGE OF SAID SOURCE VARIES CONSDERABLY, SAID REGULATING MEANS COMPRISING A LOAD-CARRYING TRANSISTOR HAVING AN EMITTER ELECTRODE, A COLLECTOR-BASE CIRCUIT AND AN EMITTER-COLLECTOR CIRCUIT CONNECTED BETWEEN ONE TERMINAL OF SAID SOURCE AND A POINT BETWEEN ADJACENT BRANCHES OF SAID BRIDGE CIRCUIT, A FIRST ADDITIONAL RESISTOR, A FIRST CONTROL TRANSISTOR HAVING A BASE ELECTRODE AND AN EMITTER-COLLECTOR CIRCUIT CONNECTED IN SERIES WITH SAID FIRST ADDITIONAL RESISTOR ACROSS THE TWO TERMINALS OF SAID SOURCE, A SECOND CONTROL TRANSISTOR HAVING AN EMITTER-COLLECTOR CIRCUIT CONNECTED IN SERIES WITH THE COLLECTOR-BASE CIRCUIT OF SAID LOADCARRYING TRANSISTOR, SAID SECOND CONTROL TRANSISTOR HAVING A BASE ELECTRODE CONNECTED TO A POINT BETWEEN THE EMITTER-COLLECTOR CIRCUIT OF SAID FIRST CONTROL TRANSSISTOR AND SAID FIRST ADDITIONAL RESISTOR THEREBY CONTROLLING THE CONDUCTIVITY OF SAID LOAD-CARRYING TRANSISTOR AND THEREBY CAUSING A REGULATED VOLTAGE TO BE APPLIED TO SAID BRIDGE CIRCUIT, AND A VOLTAGE DIVIDER CONNECTED BETWEEN THE OTHER TERMINAL OF SAID SOURCE AND THE EMITTER ELECTRODE OF SAID LOAD-CARRYING TRANSISTOR.