Oxygen Sensor 1821365J11,1821365J12,18213-65J12,18213-65J11 for SUZUKI

Oxygen sensor function
The working principle of an oxygen sensor is based on the Nernst principle. Its core component is a porous ZrO2 ceramic tube, which acts as a solid-state electrolyte. At a specific temperature, due to the difference in oxygen concentration on both sides of the ceramic tube, oxygen molecules on the side with higher concentration are adsorbed onto the platinum electrode, where they combine with electrons to form oxygen ions, making that electrode positively charged. The oxygen ions then migrate through oxygen ion vacancies within the electrolyte to the side with lower oxygen concentration, making that electrode negatively charged, thus generating a potential difference. This potential difference is directly proportional to the difference in oxygen concentration between the two sides. The ECU uses this potential difference to determine the air-fuel ratio of the mixture and adjusts the fuel injection duration accordingly.
Definition and function of oxygen sensor
Definition:
An oxygen sensor is a measuring element that utilizes ceramic sensitive elements to measure the oxygen potential in heating furnaces or exhaust pipes. Based on the principle of chemical equilibrium, it calculates the corresponding oxygen concentration, enabling the monitoring and control of the air-fuel ratio during combustion within the furnace.
Function:
It determines whether there is excess oxygen in the exhaust after engine combustion. It converts the oxygen content into a voltage signal and transmits it to the Engine Control Unit (ECU), enabling the engine to achieve closed-loop control with the target of excess air factor.
It ensures that the three-way catalytic converter achieves maximum conversion efficiency for the three pollutants in the exhaust: hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx), thereby maximizing the conversion and purification of emissions pollutants.