| 摘要 |
A common rail fuel injection system for a motor vehicle, comprising a distributor rail (16) fluidly connected to at least one fuel injector (18), an accumulator chamber (14) fluidly connected to the distributor rail, a high pr3essure fuel pump (10) that has an inlet for receiving fuel from allow pressure feed system (20, 22, 24) and an outlet chamger (12) for proving fuel at high pressure to the accumulator (14). A recirculation valve (52) is fluidly connected to the pump outlet chamber (12), the accumulator (14), and the low pressure feed system, wherein at a first position the recirculation valve fluidly aligns the outlet chamber (12) with the accumulator (14) and in a second position aligns the outlet chamber with the low pressure system for recirculation of fuel through the high pressure pump at the low pressure. A switching valve (50) is fluidly connected to the pump outlet chamber (12), the accumulator (14), and the recirculation valve (52), wherein at a first position the switching valve (50) actuates the recircuation valve (52) to the first position and at a second position the switching valve (50) actuates the recirculation valve (52) to the second position. The switching valve (50) has a set point pressure whereby when the pressure below which the recirculation valve (52) is set to first position and above which said valve (52) is set to second position.
|
