Patent ID: 9140665
Filing Date: 2015-09-22
Classification: G01N

Abstract:
1. A method for the operational test measurement of a lambda probe for calibrating and/or determining the status of the lambda probe, wherein pure air is circulated around a probe head of the lambda probe, comprising: insertion of the lambda probe into a flow receptacle which is separate from an engine construction, and the flow receptacle is configured to circulate an air stream of ambient air around a probe head of the lambda probe; generation of the air stream in the flow receptacle; wherein the air stream of ambient air in the flow receptacle is generated by: evaluation of at least one probe measurement signal, wherein: a calibration value is obtained and a heating current of the lambda probe is evaluated, wherein for the purpose of evaluating the heating current, a heating current experience range is obtained and a determination is made as to whether the measured heating current is in the heating current experience range.