IC engine fuel injection system

摘要

Each nozzle (4) has a throttling pintle (18) between the needle-valve (5) and the injection hole (17), which widens towards the outlet. Thus the free cross-section increases with increasing needle stroke, giving an injection characteristic curve which is generally triangular, with a flat rising flank and a steep falling one.The pintle can be arranged to taper, while the outlet is cylindrical. The opening of the nozzle valve is controlled by the low pressure side of a pressure regulator.