One-dimensional coupled simulation of an electronic unit pump fuel injection system

A one-dimensional physical model of electronic unit pump (EUP) was built. Electronic, magnetic and mechanic subsystem coupled simulation was carried out. EUP drive waveform, horizontal plunger displacement curve and pump outlet pressure curve were made. A test experiment was done to verify the simulation result. It shows that the maximum drive current is 13 A and maintenance current is 5 A; the maximum horizontal plunger displacement is 0.8 mm; the actual effective opening time is 2.4 ms at plunger control pulse of 3 ms; the maximum pump outlet pressure difference is 9 MPa. There exists an obvious difference in needle closing process.