The oxygen concentration sensors in the exhaust gas are installed in combination with a triple-acting catalytic converter. They provide feedback between the process of completeness of fuel combustion and ECU-KSUD, according to the presence of residual oxygen in the exhaust gas. Signals from the oxygen concentration sensor (oxygen sensor) in the exhaust gas, control signals are generated to maintain the optimum composition of the fuel-air mixture, close to stoichiometric.
The oxygen sensor provides the ECM with information about the residual oxygen content in the exhaust gas in the form of a voltage signal. When the working mixture is re-enriched or lean, the composition of the mixture is adjusted by changing the duration of fuel injection. Since the normal operation of the sensor is ensured starting from a temperature of about 350°C, a heating element is located in the sensor rod, which is switched on through a relay. In the event of a malfunction of the sensor, the composition of the mixture is adjusted based on a constant signal value of 0.45 V entered into the memory of the ECU-KSUD.