Abstract
The oxygen sensor generally used in cars is composed of a thimble type element with external air induction. When this type of sensor is applied to motorcycles, there are the following concerns:
1. The sensor is not durable enough in serious conditions because of the external air induction structure.
2. The projection of the sensor into the exhaust pipe is so large that it may effect engine performance.
3. The sensor length from the exhaust pipe causes layout difficulties because of the small size of the motorcycle exhaust system.
4. As the sensor is mostly placed away from the engine so as not to hinder performance, it takes more time for sensor activation.
In consideration of the above, we have developed a compact thick film type sensor with multi layer element using an oxygen-pumping system, thereby changing it to a hermetic structure. The element and heater have also been combined to make an integrated structure.