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Co-fired platinum high temperature sensor element
Keywords: EGTS, automotives, co-fired platinum ceramics
In recent years, initiatives for improving the fuel consumptions have been accelerated to reduce the CO2 emissions in exhaust gas from an automotive engine; as a measure against global warming. To reduce the CO2 emissions, technologies such as regulating the Air/Fuel ratio, optimizing the combustion temperature, and downscaling the turbo-charged engines are applied to recent automotive engines. Furthermore, the exhaust gas temperature is measured to estimate the combustion temperature. Then the Air/Fuel ratio is regulated successively to control the combustion temperature. Therefore, to accurately control the combustion temperature, the exhaust gas temperature must be measured accurately. For more precise estimation of the combustion temperature, the temperature sensors are placed closer to the point of combustions. In addition to a downscaling of the turbo-charged engine results to a higher exhaust temperature which exceeds 900 degrees Celsius and more. Conventionally, to measure the automotive temperatures including exhaust temperature, temperature sensors such as thermistors or platinum thin-film sensors are used. However, due to a higher exhaust temperature in recent automotive engines; thermistors are not suitable to measure such high temperature as of result of its’ physical properties, and platinum thin-film sensors are known to experience resistance drift at high temperature which results to less-accurate measurements. To measure such high temperature, we have utilized our multilayer ceramic package technology for semiconductor components as our advantage to propose a co-fired platinum high temperature sensor element. The sensor is composed of co-fired platinum conductive strips which are laminated with solid ceramic based materials. Since the platinum conductive strips are protected by placed in between a dense ceramic layers, rather than placed on top of a ceramic substrate; we were able to reduce the influence of surrounding environment to platinum conductors. Therefore, we were able to reduce the resistance drift at a temperature above 1,000 degrees Celsius, and succeeded on achieving resistance change less than 1.0% at high temperature storage test at 1,100 degrees Celsius for 1,000 hours.
Tsutomu Sugawara, member
KYOCERA Corporation
Kirishima, Kagoshima

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