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FOLYSKY（WuHan） LTD.
Car exhaust is undoubtedly one of the main causes of global warming, and the world is also trying to reduce exhaust pollution. So a three-way catalytic converter was born, and the main pollutants emitted by automobiles include HC (hydrocarbons), NOx (nitrogen oxides), CO (carbon monoxide), and unfinished combustion particles. Among them, hydrocarbons, nitrogen oxides, and carbon monoxide are the traditional "big three", which is why the three-way catalytic converter is called the "three-way catalytic converter". The ternary catalytic converter is actually a formed and sintered porous ceramic body, with catalytic elements such as platinum, rhodium, palladium added to its surface, which can enhance the activity of hydrocarbons, nitrogen oxides, and carbon monoxide, promoting it to complete as many oxidation-reduction reactions as possible. Carbon monoxide and hydrocarbons undergo oxidation at high temperatures and become carbon dioxide and water, while nitrogen oxides can be reduced to nitrogen and oxygen at high temperatures. This can significantly reduce the air pollution caused by car exhaust.
Since the introduction of a three-way catalytic converter, there has been one more oxygen sensor in the exhaust pipe of automobiles. Previously, there was usually only one oxygen sensor used to detect the oxygen content in the exhaust gas of automobiles, and then it was fed back to the ECU. The ECU would adjust the fuel injection amount, and the oxygen sensor and three-way catalytic converter were complementary. Now, there are two oxygen sensors installed in a car, one at the front and the other at the rear of the three-way catalytic converter. We can see how the oxygen sensor and three-way catalytic converter work together by assuming a situation of "insufficient combustion":
After the incomplete combustion of exhaust gas comes out, it passes through oxygen sensor A. Oxygen sensor A finds that the oxygen content in the exhaust gas is low, and it is necessary to reduce the fuel injection amount; The exhaust gas undergoes oxidation and reduction reactions through a three-way catalytic converter. Although nitrogen oxides are catalytic reduced to produce oxygen, due to insufficient combustion before, there are more carbon monoxide and hydrocarbons in the exhaust gas. The oxidation reaction consumes more residual oxygen in the exhaust gas, resulting in a further decrease in oxygen content in the exhaust gas. The exhaust gas then passes through oxygen sensor B, which further confirms that the oxygen content in the exhaust gas has decreased. Oxygen sensor A and oxygen sensor B had a meeting, and the two brothers together issued a formal notice to the ECU: Dude, you have injected too much fuel! So the ECU adjusted the fuel injection amount according to the oxygen sensor command until the "two brothers" were satisfied. Similarly, if the oxygen content in the exhaust is too high, the "two brothers" will instruct the ECU to increase the fuel injection rate. At this time, even if the mixture of oil and gas is ideal, it may be due to the production of too many nitrogen oxides, resulting in a decrease in oxygen content in the exhaust gas. If only one oxygen sensor A is used to monitor exhaust gas, it is likely to be misjudged as excessive fuel injection; However, relying solely on the oxygen sensor B at the tail end of the three-way catalytic converter, it is misjudged that the fuel injection is insufficient due to the reduction of oxygen from nitrogen oxides.
The second scenario is when the engine temperature does not reach a stable level after a period of cold start, but the oxygen sensor heats up to the operating temperature. Due to the low content of nitrogen oxides and high oxygen content in the exhaust gas, oxygen sensor A will determine that the fuel injection quantity is low; After the exhaust gas passes through the three-way catalytic converter, carbon monoxide and hydrocarbons undergo oxidation reactions, resulting in low oxygen content in the exhaust gas, which can also cause misjudgment of oxygen sensor B.
In this sense, both the front and rear ends of the three-way catalytic converter must be equipped with oxygen sensors to complete exhaust gas monitoring. Without the participation of a three-way catalytic converter, there would be no "front and rear" difference between the so-called oxygen sensors at the front and rear ends of the three-way catalytic converter. This is equivalent to an oxygen sensor working alone, which is prone to misjudgment.
Sliton has recently established a dedicated research and development team for automotive oxygen sensors, dedicated to assisting in the development of high-end oxygen sensors in China. Silitong Ceramic Circuit Board is one of the brands under Fuli Tiansheng Technology, focusing on the research and development, production, and sales of ceramic circuit boards. With support from national university research teams and national laboratories, it has become a leading brand of ceramic circuit boards in China.
The oxygen sensor substrate also belongs to a type of ceramic circuit board. Sliton will adopt new technology to manufacture a board that can withstand higher temperature differences and improve overall stability, with the goal of doubling the lifespan of domestic oxygen sensors.
Although fuel powered vehicles are gradually declining, with the wave of the Internet of Things, the application range of oxygen sensors is also rapidly growing, and the entire market capacity will be unimaginable; And our country must have its own oxygen sensor that can stand at the top of the world, and Sliton will work together.
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