In this paper, the authors present the first carbon dioxide sensor designed for automotive applications. The sensor is based on the spectroscopic measurement principle. It includes a new robust micromachined infrared gas-detector and a corresponding, newly developed ASIC. First application studies show its suitability for automatic vehicle air-management systems. Based on the measurements carried out in this study, key requirements for automotive carbon dioxide sensors can be determined. For air-management systems, a high resolution of about 200ppm and a good accuracy over the full automotive temperature range will be necessary to realise an effective control of the carbon dioxide level inside the car. The measurement range should be between 0ppm and 5.000ppm. For leak detection, a short reaction time below 10s and a measurement range between 5.000ppm and 30.000ppm will be necessary. This measurement range and reaction time will be sufficient to detect leaks of the system before unwanted concentrations can develop. For both applications good long term stability and the ability to measure absolute concentrations is mandatory. The spectroscopic sensor described in this paper is able to fulfil both set of requirements and can thus be used for air-management systems as well as for leak detection in R744 systems.
Infrared carbon dioxide sensor and its applications in automotive air-conditioning systems
Ein Infrarot-Kohlendioxidsensor und seine Anwendung in Fahrzeug-Klimaanlagen
2005
11 Seiten, 9 Bilder, 1 Tabelle, 7 Quellen
Conference paper
English
Infrared Carbon Dioxide Sensor and its Applications in Automotive Air-Conditioning Systems
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