Apparatus for detecting hydrocarbons using crystal...

B - Operations – Transporting – 67 – D

Patent

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Details

B67D 7/54 (2010.01) B67D 7/04 (2010.01) G01N 29/02 (2006.01) G01N 29/036 (2006.01)

Patent

CA 2332648

A vapor recovery system (18) utilizes a crystal oscillator (30) for sensing the presence of hydrocarbon in the vapor emissions emanating from a fuel tank (10) during refueling. The crystal oscillator (30) 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 (30) experiences a shift in its oscillation frequency relative to the fundamental resonance frequency. The frequency shift (34) is representative of the hydrocarbon concentration in the vapor emissions. A control signal (36) based on the frequency shift (34) is generated and then used to adjust the operating speed of a vapor pump (26).

Selon cette invention, un système (18) de récupération des vapeurs utilise un oscillateur à quartz (30) pour détecter la présence d'hydrocarbures dans les vapeurs émanant d'un réservoir de carburant (10) pendant le remplissage. L'oscillateur à quartz (30) est recouvert d'une couche faite d'un matériau sensible à la présence d'hydrocarbures. Sous l'effet de toute interaction entre la couche de revêtement et un hydrocarbure, l'oscillateur à quartz (30) subit un déplacement de fréquence d'oscillation par rapport à la fréquence de résonance fondamentale. Le déplacement de fréquence (34) est représentatif de la concentration des hydrocarbures dans les émanations de vapeurs. Un signal de commande (36) basé sur le déplacement de fréquence (34) est généré; il est ensuite utilisé pour réguler la vitesse de fonctionnement de la pompe à vapeur (26).

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