Comparison and structural optimization of common rail injectors without static leakage
The injector scheme without static leakage is compared with the traditional injector scheme,and the structural parameters of the former are optimized.The purpose is to understand and optimize its fuel injection law to achieve a larger injection volume during a certain sustained injection period.The one-dimensional simulation software AMESim is used to build the models of the two injector schemes,and the simulation and calculation results are compared.By comparison,the opening time of the needle valve in the scheme without static leakage is shorter and the closing time is longer.During the parameter optimization process,it is found that as the diameter of the control piston decreases,the opening time and closing time of the needle valve show a decreasing trend,but the force of high-pressure fuel at the lower end of the control plunger on the control piston will be reduced,resulting in the delay of the opening time of the needle valve.There is an optimal value to minimize the movement time of the needle valve under the premise that the needle valve can be opened.By optimizing the diameters of the inlet and outlet orifices and the control piston,the total needle valve movement time is shortened by 34.88％,and the problem of slow seating speed of the needle valve without static leakage is solved.
high-pressure common rail injectorstatic leakageAMESim
NETL
NSTL
万方数据
