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1. 发明申请

US20080053413A1 SEALED FUEL TANK EVAPORATIVE EMISSIONS CONTROL SYSTEM FOR SMALL INTERNAL COMBUSTION ENGINES 审中-公开
标题翻译：密封燃油箱蒸发排放小型内燃机控制系统
公开(公告)号：US20080053413A1
公开(公告)日：2008-03-06
申请号：US11770820
申请日：2007-06-29
申请人： Ronald J. Donahue , Barry P. Schleicher
发明人： Ronald J. Donahue , Barry P. Schleicher
IPC分类号： F02M17/00 , B60K15/01
CPC分类号： F02M25/0854 , A01D34/82 , F02M25/0872 , F02M25/089
摘要： The present invention provides an evaporative emissions control system for small internal combustion engines. The fuel tank of the engine includes a filler neck closed by a fuel tank cap which seals the fuel tank in a manner in which air and/or fuel vapors are not permitted to pass between the filler neck and the fuel tank cap. The fuel tank cap includes a first, one-way vacuum relief valve therein which operates to allow atmospheric make-up air to enter the fuel tank to replace a decreasing amount of fuel in the fuel tank during running of the engine, or otherwise as needed. The fuel tank cap additionally includes a second, one-way pressure relief valve having a first cracking threshold which operates to relieve high pressures within the fuel tank. Additionally, the fuel supply line between the fuel tank and the carburetor includes a fuel flow inhibiting or blocking member having a second cracking threshold greater than the first cracking threshold of the pressure relief valve of the fuel tank cap. In operation, fuel vapors are sealed within the fuel tank at all times when the fuel tank cap is closed to prevent fuel vapors from escaping into the atmosphere, and the fuel flow blocking member prevents flooding of the carburetor with liquid fuel if the fuel vapors within the fuel tank build to a high pressure prior to cracking of the pressure relief valve of the fuel tank cap. When the fuel tank cap is removed, a vapor vent valve in communication with the vapor dome of the fuel tank is opened, allowing vapor pressure to be relieved prior to disengagement of the fuel tank cap from the filler neck.
摘要翻译：本发明提供了一种用于小型内燃机的蒸发排放控制系统。发动机的燃料箱包括由燃料箱盖封闭的加油口，所述燃料箱盖以不允许空气和/或燃料蒸汽在加油口和燃料箱盖之间通过的方式密封燃料箱。燃料箱盖包括其中的第一单向真空安全阀，其操作以允许大气补充空气进入燃料箱以在发动机运行期间替换燃料箱中的减少量的燃料，或者根据需要。燃料箱盖还包括具有第一裂解阈值的第二单向压力释放阀，其操作以减轻燃料箱内的高压。此外，燃料箱和化油器之间的燃料供给管路包括具有大于燃料箱盖的减压阀的第一裂解阈值的第二裂解阈值的燃料流量抑制或阻塞构件。在操作中，当燃料箱盖关闭时，燃料蒸汽一直被密封在燃料箱内，以防止燃料蒸汽逸出大气，并且如果燃料蒸汽在其内部燃料蒸汽在燃料箱盖的减压阀开裂之前，燃料箱构成高压。当燃料箱盖被移除时，与燃料箱的蒸汽圆顶连通的蒸汽排放阀打开，允许蒸汽压力在燃料箱盖从加注口分离之前释放。

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