公开(公告)号：US07066152B2

公开(公告)日：2006-06-27

申请号：US10934975

申请日：2004-09-03

申请人： Kathleen H. Stroia ,  Stephen T. Kempfer ,  Dequan Yu ,  Matti K. Vint ,  Ross D. Pursifull

发明人： Kathleen H. Stroia ,  Stephen T. Kempfer ,  Dequan Yu ,  Matti K. Vint ,  Ross D. Pursifull

IPC分类号： F02M59/46

CPC分类号： F02M25/0809 ,  F02M25/0827 ,  F02M63/0215

摘要： A fuel delivery system is provided with a fuel solenoid valve to minimize fuel leakage and evaporative emissions during diurnal cycles by preventing pressure buildup as the temperature of the fuel system rises. The fuel solenoid valve is located between a pressurized side of the delivery system and a fuel tank. In one embodiment, the fuel solenoid valve is closed when the engine is running or when the engine is off and the rail is hot. When the fuel rail cools down, the solenoid valve opens to bleed a desired amount of fuel thereby creating a fuel vapor space. Thereafter, during hot soak conditions of the diurnal cycles when the fuel rail is hot again while the engine is off, the pressure will rise due to the thermal expansion of the fuel and the created fuel vapor space minimizes further rising of the fuel pressure. Further, by adjusting the solenoid valve opening time, the pressure rising limit may be set at a desired pressure to minimize injector leakage.

摘要翻译： 燃料输送系统设置有燃料电磁阀，以通过在燃料系统的温度升高时防止压力累积来最小化燃料泄漏和昼间循环期间的蒸发排放。 燃料电磁阀位于输送系统的加压侧和燃料箱之间。 在一个实施例中，当发动机运转时或者当发动机关闭并且钢轨是热的时，燃料电磁阀关闭。 当燃料导轨冷却时，电磁阀打开以排出所需量的燃料，从而形成燃料蒸气空间。 此后，在发动机关闭时燃料轨再次热时，在昼夜循环的热浸条件下，由于燃料的热膨胀而产生的压力将上升，并且所产生的燃料蒸气空间使燃料压力的进一步上升最小化。 此外，通过调节电磁阀打开时间，可以将上压极限设定在期望的压力以使喷射器泄漏最小化。