发明名称 Liquid level and composition sensing systems and methods using EMF wave propagation
摘要 An automotive urea solution monitoring device is deployed in conjunction with the urea tank of a selective catalytic reduction vehicle. An RF signal of a constant frequency may be generated across a resonant circuit, which may be comprised of an inductor and a PCB trace capacitor, or the like. Electromagnetic radiation is propagated into the automotive urea solution in the urea tank. The conductivity and dielectric properties of the liquid change the impedance of the discrete/trace capacitor and or the discrete/trace inductor. These changes are proportional to ammonia content, temperature, and/or level of the automotive urea solution in the urea tank and are preferably detected by a microcontroller, or the like, and then transmitted to a selective catalytic reduction vehicle engine management system, or the like.
申请公布号 US8482298(B2) 申请公布日期 2013.07.09
申请号 US20070800965 申请日期 2007.05.08
申请人 BOUDAOUD IDIR;MCCALL ALAN KENNETH;PAGE ADRIAN M.;SCHRADER ELECTRONICS LTD. 发明人 BOUDAOUD IDIR;MCCALL ALAN KENNETH;PAGE ADRIAN M.
分类号 G01R27/32;G01N11/00;G01N21/00 主分类号 G01R27/32
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