Abstract
AbstractIncreasing precision and robustness are the main drivers for the next generation of air flow meters for automotive applications while cost reduction is the key factor for a successful market entry. This contradiction can be resolved by increasing the sensor intelligence by efficient digital signal processing and by evaluation of all information available within the sensor system. Compared to a stand-alone sensor, further cost reduction is realized by integration of additional pressure and/or humidity sensors in the air flow meter. The information of pressure and/or humidity near the air flow meter provides additional relevant parameters to the engine controller. A digital SENT interface is used to submit the information to the engine controller with a minimum number of wires.KeywordsHot-film air flow meterHFM8Integration pressure and humidity sensorSENT
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