Oxygen sensor
The oxygen sensor consists of a ceramic coating made of zirconium dioxide (laminated). The heating element inserted in the laminate rapidly ensures the required operating temperature of at least 750 °C. The oxygen sensor contains 2 cells, a measuring cell and a reference cell. The two cells are coated with electrode made of platinum.
| Index | Explanation |
|---|---|
| 1 | Exhaust gas |
| 2 | Measuring cell |
| 3 | Electrode for heating |
| 4 | Electrode of the measuring cell |
| 5 | Heating element |
| 6 | Gap with ambient air |
| 7 | Ceramic surface |
| 8 | Reference cell |
| 9 | Electrode of the reference cell |
| 10 | Electrode of the measuring cell |
| 11 | Electrode of the measuring cell |
| 12 | Measuring gap |
The oxygen sensor provides seamless, continuously-variable response while monitoring fuel ratios ranging from 0.65 to 2.5 (continuous characteristic curve). This oxygen sensor works with a lower heater output than a conventional oxygen sensor. In addition, this oxygen sensor is ready for operation more quickly. Current is applied at the measuring cell. This pumps oxygen into the reference cell in a process that continues until a voltage of 450 millivolts is present between the reference cell's electrodes. The applied current at the measuring cell is the measured variable for the fuel-air ratio. This enables the oxygen sensor emissions control to set any desired air/fuel ratio in the combustion chamber.