发明名称 |
Apparatus for detecting hydrocarbon using crystal oscillators within fuel dispensers |
摘要 |
A vapor recovery system is disclosed that utilizes a crystal oscillator for sensing the presence of hydrocarbon in the vapor emissions emanating from a fuel tank during refueling. The crystal oscillator is coated with a layer of material having a sensitivity for hydrocarbon. In response to any interaction between the coating layer and hydrocarbon, the crystal oscillator experiences a shift in its oscillation frequency relative to the fundamental resonance frequency. The frequency shift is representative of the hydrocarbon concentration in the vapor emissions. A control signal based on the frequency shift is generated and then used to adjust the operating speed of the vapor pump.
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申请公布号 |
US6167747(B1) |
申请公布日期 |
2001.01.02 |
申请号 |
US19980134116 |
申请日期 |
1998.08.14 |
申请人 |
TOKHEIM CORPORATION |
发明人 |
KOCH WOLFGANG H.;BROWN ARTHUR R. |
分类号 |
B67D7/54;B67D7/04;G01N29/036;(IPC1-7):B67D5/378;B65B1/04;G01N29/02 |
主分类号 |
B67D7/54 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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