INTERNAL SECONDARY FUEL RAIL ORIFICE

摘要

A fuel rail assembly configured for connection to an internal combustion engine includes a first fuel rail, a second fuel rail, and a crossover hose. The first fuel rail includes an inlet having a first flow restrictor and configured to be coupled to a high-pressure pump. The first fuel rail further includes a second flow restrictor disposed in an interior portion that divides the interior into a first rail volume and a remainder volume. The crossover hose includes a third flow restrictor near the end that is connected to the second fuel rail. A first pulsation control volume is defined between the pump and the inlet. A second pulsation control volume is defined to include the remainder volume and the volume in the crossover hose (i.e., between the first and second flow restrictors). The pulsation control volumes reduce pressure fluctuations produced by the high-pressure pump.

主权项

1. A fuel rail assembly configured for connection to an internal combustion engine, comprising:
a first fuel rail having a first interior and an inlet configured to be coupled to a high-pressure fuel pump using a supply hose wherein a first flow restrictor is disposed between the pump and the first interior, said first fuel rail further having a second flow restrictor disposed in the first interior to form a first rail volume and a remainder volume, said first fuel rail further having a first crossover port; a second fuel rail having a second interior with a second rail volume, said second fuel rail having a second crossover port; a crossover hose coupled to said first and second crossover ports and configured to allow communication of fuel between said first and second fuel rails; and a third flow restrictor proximate said second crossover port and disposed in one of said crossover hose and said second fuel rail.