Importance

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Abstract

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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First Claim