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| Air/Fuel Ratio Sensor |
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| The air/fuel ratio sensor, installed in the exhaust manifold, detects the degree of the exhaust gas air/fuel ratio. Based on signals from the air/fuel ratio sensor, the engine ECU controls the air/fuel ratio in the combustion chamber (air/fuel ratio feedback control).
DENSO provides two types of air/fuel ratio sensors: a planar type and a thimble type.
DENSO Technology – Leading the World
In 1996, DENSO launched the world’s first air/fuel ratio sensor, achieving more precise control of the air/fuel ratio than is possible using a conventional oxygen sensor.
Benefits and Features
- Quick activation of zirconia solid electrolyte
- DENSO’s planar type air/fuel ratio sensor has a zirconia solid electrolyte integrated with an alumina heater substrate, allowing it to more quickly detect oxygen concentration with a light-off time of 10 seconds.
- High-detection accuracy
- Precisely controls the amount of oxygen ions that flow in the diffusion layer to limit current flow, resulting in high-accuracy detection.
Product Types
| Product type |
Heater |
Light-off time
(seconds) |
Response time
(milliseconds) |
| Planar type |
Integrated with solid electrolyte |
15 |
200 |
| Thimble type |
Separated from solid electrolyte |
20 |
200 | |
Structure of Planar Air/Fuel Ratio Sensor
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