| 摘要 |
A fuel pump for a direct injection internal combustion engine having a housing defining a pump chamber 38. Driven and idler toothed gears 44, 46 are rotatably mounted within the pump chamber 38 so that the driven and idler gears 44, 46 are in mesh with each other at a predetermined location in the pump chamber 38. A fluid inlet 26 is formed through the housing 36 and open to an inlet subchamber 52 in the pump chamber 38. A fluid outlet 54 is also formed through the housing 36 and open to an outlet subchamber 56 in the pump chamber. A pressure relief passageway 60 fluidly connects the inlet subchamber 52 to the outlet subchamber 56 and a valve 62 is disposed in series with the pressure relief passageway 60. A control circuit 23 controls the actuation of the valve 62 to control the pump pressure at the pump outlet. |
