Method for line assignment of a short-circuit of a broadband lambda sensor

An evaluation circuit for line assignment of a short-circuit of a broadband lambda sensor (18), which has a sensor (20) and multiple sensor lines (42, 43, 44, 55), the evaluation circuit comprising:

• a reference potential terminal (56);
• one sensor line terminal (52, 53, 54, 55) for each of the sensor lines;
• a limiting resistor (66), which is connected to the reference potential terminal;
• one switch (62, 63, 64, 65) for each of the sensor lines, wherein each of the switches is connected to the sensor line terminal for the respective sensor line and is connected via the limiting resistor to the reference potential terminal and is configured to establish or disconnect a connection via the limiting resistor between the respective sensor line terminal and the reference potential terminal;
• and
• a comparator (82, 83, 84, 85, 92, 93, 94, 95;
• 72, 73, 74, 75) for the sensor lines, which is configured to compare a sensor line potential applied on the respective sensor line to an upper short-circuit potential (88) applied on an upper short-circuit potential terminal (86) and/or a lower short-circuit potential (98) applied on a lower short-circuit potential terminal (96) and/or a reference potential (58) applied on the reference potential terminal (56).

A non-transitory, computer-readable storage medium containing instructions that when executed by a computer cause the computer to line assign a short-circuit of a broadband lambda sensor (18) having an upper or a lower short-circuit potential and multiple sensor lines (42, 43, 44, 45) by

• establishing (102) a conductive connection of at least one sensor line of multiple sensor lines via a limiting resistor (66) to a reference potential, wherein a reference potential range defined around the reference potential is between an upper short-circuit potential range defined around the upper short-circuit potential and a lower short-circuit potential range defined around the lower short-circuit potential;
• comparing (104) a sensor line potential of at least one sensor line to be checked of the multiple sensor lines to the reference potential;
• classifying (105) the at least one sensor line to be checked as not short-circuited with the upper or the lower short-circuit potential if it is established upon the comparison that the at least one sensor line potential is within the reference potential range;
• and
• assigning the short-circuit to at least one sensor line not classified as not short-circuited.

A method for line assignment of a short-circuit of a broadband lambda sensor (18) having an upper or a lower short-circuit potential, wherein the broadband lambda sensor has a sensor (20) and multiple sensor lines (42, 43, 44, 45), the method comprising

• establishing (102) a conductive connection of at least one sensor line of the multiple sensor lines via a limiting resistor (66) to a reference potential, wherein a reference potential range defined around the reference potential is between an upper short-circuit potential range defined around the upper short-circuit potential and a lower short-circuit potential range defined around the lower short-circuit potential;
• comparing (104) a sensor line potential of at least one sensor line to be checked of the multiple sensor lines to the upper and the lower short-circuit potential;
• classifying (105) the at least one sensor line to be checked as not short-circuited with the upper or the lower short-circuit potential if it is established upon the comparison that the sensor line potential is outside the upper short-circuit potential range and outside the lower short-circuit potential range;
• and
• assigning the short-circuit to at least one sensor line not classified as not short-circuited.