SENSOR APPARATUS FOR DETECTING A GAS CONCENTRATION AND A PARTICLE CONCENTRATION OF AN EXHAUST GAS

摘要

A sensor apparatus (1) for detecting a concentration of at least one gas component and a particle concentration of an exhaust gas in an exhaust gas channel of an internal combustion engine has a sensor carrier (5) having a solid electrolyte (50). The sensor apparatus (1) comprises a first electrode (10) and a second electrode (40) which are arranged at a predefined distance from one another on an outer side of the sensor carrier (5). The sensor apparatus (1) comprises a substrate which has substantially no electrical conductivity at least below a predefined operating limit temperature of the substrate and is arranged in a predefined first region of the sensor carrier (5) in such a manner that the first electrode (10) and the second electrode (40) are substantially electrically decoupled from one another if the outer side of the sensor carrier (5) is substantially free of particles. The sensor apparatus (1) has a third electrode (20) which is coupled to the solid electrolyte (50), wherein the solid electrolyte (50) is designed in such a manner that the latter is additionally coupled to the second electrode (40). The sensor apparatus (1) comprises a diffusion barrier (30) which is arranged and designed in such a manner that the latter is coupled to the third electrode in a predefined third region and the exhaust gas is applied to the third electrode (20) only in the third region via the diffusion barrier (30).