Total integrated simulation technology for fuel pump with system-fluid-magnetic co-simulation

Abstract

Automotive fuel can be efficiently combusted by injecting it into the cylinders at high pressure to atomize it to pass gas and fuel economy regulations for exhaust. Automotive companies have developed direct injection engines, which inject gasoline directly into the cylinders. Demand for quieter high pressure pumps is also increasing because this contributes to automotive comfort. The valve motion need to be predicted with high accuracy under the operation condition because the noise of the fuel pumps is caused by solenoid valve impingement, which causes the noise level to rise. Measuring the valve motion is difficult because of the components around the valve region, and making a prototype is very time-consuming. An analysis method that can accurately predict valve motion is needed. The valve motion is defined by the total balance of spring, fluid, and magnetic forces acting on the valve. The mechanical, fluid, and magnetic effects must also be predicted simultaneously. To address these issues, we developed an integrated simulation method with coupling 1D system analysis, 3D fluid analysis, and 3D magnetic analysis. We tested this method, and the fluid, magnetic effect also can be predicted high accurately with this method. In addition, the simulation accuracy of the valve motion rose to 7% with this method.

Keywords

• valve
• pump
• co-simulation
• computer fluid dynamics
• squeeze film
• impingement
• eddy current
• moving boundary