This ceramic sensor is based on a yttrium-doped zirconia electrolyte that measures the oxygen concentration in the exhaust gas entering the diffusion barrier and reaching the first chamber.

Spend. in the first chamber by applying a constant voltage V0 to the main pump motor (P+, P-). The oxygen concentration in the chamber is accompanied by a pump

The current IP0 is drawn away, leaving a small amount of oxygen concentration. IP0 is directly proportional to the amount of oxygen entering the chamber and the amount of oxygen pumped away through the electrolyte

Compare. Other exhaust gas components like HC, CO, H2, etc. are oxidized on the pump electrode made of Pt. Small amounts of oxygen and NOx to be tested

The gas enters the second chamber, where the remaining oxygen is completely removed by the auxiliary pump and reacts on the measuring electrode

(NO↔ N2+O2), the generated oxygen is gradually pumped away by the measuring pump, and the balance of the reaction is broken, resulting in all NO

Decomposed and pumped away, the resulting IP2 represents the concentration of NOx in the exhaust gas.

The electronic control unit provides heating power control for heating the sensing element to an operating temperature. All pump unit work

The conditions determine the concentration of NOx. The air-fuel ratio, oxygen concentration, and nitrogen and oxygen concentration signals are transmitted to the DCU (SCR) through the CAN bus.

Control system), used to control the injection volume of urea.