| 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 pressure fuel pump ( 10 ) that has an inlet for receiving fuel from a low pressure feed system ( 20, 22, 24 ) and an outlet chamber ( 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 recirculation 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.
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