电 控 单 体 泵 多 泵 供 油 系 统 一 致 性 研 究

The research on the effects of different low-pressure fuel supply pressures and key structural parameters of a single pump on the consistency of multi-pumps was carried out. The variation law of multi-pump fuel supply characteristics with various parameters was obtained. Using AMESim one-dimensional simulation software，the model of the single pump of the electronic unit pump （EUP） and the fuel supply system of a certain 8 V diesel engine was established. The accuracy of the model was verified by comparing the test data. Then the influence of low-pressure fuel supply pressure and cam speed on the fuel charging pressure and fuel supply pressure of the four EUP’s on the same side in the single-pump as well as 8 V multi-pump fuel supply system was investigated. 0.6 MPa was determined as the most suitable low-pressure fuel supply pressure. The variation law of peak pressure and peak pressure consistency of fuel supply in each cylinder was obtained. At the same time，the influence of the main structural parameters of single EUP on itself and the four EUPs on the same side was studied. The variation rule of the dispersion with each structural parameter was obtained. The results show that when the half cone angle and the diameter of the high-pressure fuel tube change，the overall dispersion fluctuation rate is within 0.5%. When the control valve lift and plunger diameter change，the dispersion fluctuation rates of the injection volume and the peak pressure are 2.03%，0.58% and 0.93%，0.19%，so the precision of the control valve lift and plunger diameter should be strictly controlled during manufacturing.