Method for detecting the type of lambda probes

摘要

Methods for detecting the type of lambda probes having at least two electrodes disposed on and/or in a solid electrolyte, of which at least one electrode is separated from a gas mixture by a diffusion barrier, and a pump current Ip being applied to at least one of the electrodes. Either the internal resistance of the lambda probe between the electrodes is determined and the type of probe is inferred on the basis of this resistance, or currents are impressed between the electrodes and the type of probe is inferred based on the voltages or resistance ratios thereby resulting.

主权项

1. A method for detecting a type of lambda probe having at least two electrodes disposed at least one of on and in a solid electrolyte, of which at least one electrode is separated from a gas mixture by at least one diffusion barrier, and a pump current being applied to at least one of the electrodes, the method comprising:
determining a first internal resistance of the lambda probe between the at least two electrodes at at least one predefined operating temperature of the probe; and determining the type of lambda probe based on a value of the first internal resistance and at least one further variable characterizing the type of lambda probe; wherein an additional pump-current amount is impressed between an outer pump electrode and an inner pump electrode in addition to a regulated pump-current value necessary for the proper operation of the lambda probe, and wherein a probe signal as the result of the additionally impressed pump-current is determined as the at least one further variable characterizing the type of lambda probe.