共轨系统喷油量偏差及压力波动的抑制研究

Research on Inhibition of Fuel Injection Quantity Deviation and Pressure Fluctuation in Common Rail System

为有效对喷油器入口处产生的压力波动进行抑制,采用新型阻尼滤波器进行压力波动控制效果的试验研究。在不同滤波器容腔体积、喷射控制策略和轨压下,研究在长度更长、直径更小的高压油管中的滤波效果。研究表明:添加滤波器后,单次喷射控制策略下可有效减小喷油量波动幅度。多次喷射控制策略下,预主喷策略下,容腔体积为1720 mm^(3)时的主喷油量偏差幅度比容腔体积0 mm^(3)时的主喷油量偏差幅度减小55.0%~67.9%;主后喷策略下,容腔体积为1720 mm^(3)时的后喷油量偏差幅度比容腔体积0 mm^(3)时的后喷油量偏差幅度减小80.8%~82.5%。预主喷策略下,容腔体积为1720 mm^(3)时的主喷油量波动幅度仅比容腔体积28000 mm^(3)时的主喷油量波动幅度分别增大了0.2 mg、0.4 mg和0.3 mg;主后喷策略下,容腔体积为1720 mm^(3)时的后喷油量波动幅度仅比容腔体积28000 mm^(3)时的后喷油量波动幅度分别增大了0.3 mg、0.4 mg和0.7 mg。

In order to effectively suppress the pressure fluctuation generated at the inlet of the injector,a new damping filter was used to carry out an experimental study on the pressure fluctuation control effect.The filtering effects on high-pressure tubing with longer length and smaller diameter under different vessel volumes,rail pressures and injection strategies were researched.Results indicate that the filter can significantly decrease the amplitude of pressure fluctuation under the single injection condition.Under the multiple injection control strategy,when the volume of filter chamber is 1720 mm^(3),the deviation of the main injection quantity is 55.0%~67.9%less than that when the volume of filter chamber is 0 mm^(3)in the premain injection mode.When the volume of filter chamber is 1720 mm^(3),the deviation of the post injection quantity is 80.8%~82.5%less than that when the volume of filter chamber is 0 mm^(3)in main-post injection mode,accordingly.In the pre-main injection mode,when the volume of the filter chamber is 1720 mm^(3),the fluctuation amplitude of the main injection quantity is only 0.2 mg,0.4 mg and 0.3 mg higher than that of the main injection quantity when the volume of the filter chamber is 28000 mm^(3).In the main-post injection mode,when the volume of the filter chamber is 1720 mm^(3),the fluctuation amplitude of the post injection quantity is only 0.3 mg,0.4 mg and 0.7 mg higher than that of the post injection quantity when the volume of the filter chamber is 28000 mm^(3).