The structure and working principle of automotive two cavities plate-type oxygen sensor are introduced

oxygen concentration detection and calculation method under the working condition of constant temperature and Nernst voltage are discussed. The constant resistance heating control circuit and the IPUMP closed-loop control circuit based on the setting Nerst voltage are presented

as well as the composition of multi-node test and calibration system

calibration method and flow. The system using this method can realize automatic test

calibration and data record with multi oxygen sensors

and effectively improve efficiency of test and calibration.