In recent years, the development of automotive ceramics is also relatively rapid, the use of zirconia ceramics to create oxygen sensors can reduce the pollution of automobile exhaust, which caused many researchers to study, the following Kezhong Ceramics factory to introduce the latest development of oxygen sensors at home and abroad.
With the development of economy and automobile industry, the use of cars is increasing rapidly, and people are paying more and more attention to exhaust pollution.
The main pollutants emitted by automobiles are CO, HC and NOx. In the external purification measures, three-way catalytic converters equipped with platinum, rhodium and palladium are used to oxidize CO and HC and reduce NOx to convert them into harmless components.
In order to improve the efficiency of the ternary catalytic converter and reduce the emission, it is necessary to control the air-fuel ratio in a closed loop.
Zirconia oxygen sensor is one of the most mature and most productive oxygen sensors at present, and it is one of the key components in the automobile emission control system. Its signal output characteristics directly affect the fuel economy and emission control of the engine, so the research and development of zirconia oxygen sensor is of great significance.
Zirconia ceramic parts finishing
Foreign development: Bendix developed electronic fuel injection systems in the late 1950s, but it was not until the 1970s that electronic fuel injection systems became mature and operational.
Westinghouse Research Laboratory found in the early 1960s that zirconia electrolytes can be used to make oxygen sensors, and General Motors Research Laboratory was the first to study zirconia sensors applied to automobile air-fuel ratio monitoring.
Westinghouse
Eddie actually used it to monitor car exhaust in 1971.
In 1976, the German BOSCH company first successfully developed a zirconia based circular tube type concentration oxygen sensor without heater, and used in VOLVO cars.
In 1982, BOSCH incorporated a ceramic heating rod as a separate element to develop a cylindrical tube concentration type oxygen sensor with a heater.
In the 1980s, Japan's NGK company successfully developed zirconia based limit current type oxygen sensors used in Toyota's lean combustion system, and used in CARINA cars listed in 1984.
BOSCH company in 1994 began to study the flat oxygen sensor, the heater integrated in the oxygen sensor, to achieve fast response, low energy consumption purposes, while laying the foundation for its miniaturization, integration, 1998 its products have been put into the market.
At present, the international oxygen sensor manufacturers are mainly BOSCH company in Germany, DELPHI company in the United States, NGK Company in Japan and so on.
Domestic development status: Due to the late start, the technical content of oxygen sensors is very high, the current domestic research and development in this area is relatively weak, and there is a big gap with foreign countries.
At present, the domestic oxygen sensor mainly relies on imports, only a few companies in China can produce, such as Shanghai Pucheng Sensor Co., Ltd. since 1986 developed China's first vehicle oxygen sensor, Sichuan Chengdu Kangda Electronics Co., Ltd. and Zhuhai Xiangzhijun Technology Co., Ltd. have also developed oxygen sensor products with independent intellectual property rights.
Some university research institutions, such as University of Science and Technology Beijing, Huazhong University of Science and Technology, Xi 'an Jiaotong University, University of Electronic Science and Technology, Tianjin University, etc., have carried out relevant research, respectively, in the concentration type, limit current type and semiconductor resistance type oxygen sensor and related materials have achieved certain results, but compared with the performance of foreign products, still need to be further improved.