| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel supply device capable of correctly adjusting fuel pressure supplied to an internal combustion engine according to the operating state of the internal combustion engine. SOLUTION: The fuel supply device includes: a first electric pump 30 delivering fuel into a first passage 21; a second electric pump 40 delivering the fuel into a second passage 22 communicating with the passage 21; a relief valve 50 discharging the fuel from the passage 22 when the fuel pressure of the passage 22 exceeds relief pressure; a pressure regulator 60 discharging the fuel from a fuel chamber 64 when the fuel pressure of the fuel chamber 64 communicating with the passage 22 exceeds regulation pressure higher than relief pressure with the fuel pressure of a back pressure chamber 65 communicating with the passage 21 equal to the relief pressure; and a control unit 4 switching the control mode of the electric pump 30 and the electric pump 40 between a low pressure mode and a high pressure mode based on the operation state of the internal combustion engine 6, the control unit controlling the electric pump 30 to stop and controlling the pressure of fuel delivered from the electric pump 40 to become higher than the relief pressure at the low pressure mode, and the control unit controlling the pressure of fuel delivered from the electric pump to become higher than regulation pressure and controlling the pressure of fuel delivered from the electric pump to become higher than the relief pressure at the high pressure mode. COPYRIGHT: (C)2011,JPO&INPIT
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