双燃料发动机电液协同控制天然气喷射阀运动特性研究

Research on the Motion Characteristics of Electro-Hydraulic Injection Valve of Duel Fuel Engines

研究了天然气/柴油双燃料发动机电液协同控制燃气喷射阀的运动特性,确定了影响喷射运动特性的主要因素,掌握了喷射阀喷射规律,并通过装机试验分析了喷射阀的适用性。研究结果表明:泄油口孔径一定时,喷射阀最大升程受液压活塞泄油孔位置影响,控制脉宽越大,喷射阀喷射持续时间越长,进气量越大;在喷射阀结构一定的情况下,液压压力及控制脉宽是影响喷射阀运动特性的重要因素,增大液压压力可以增加喷射阀启动及回落响应性,同时也会增大喷射阀的进气流量。

The motion characteristics of electro-hydraulic gas injection valve for dual-fuel engines were studied to determine the main factors which influence the injection valve motion characteristics and to investigate the injection valve lift regularity, also to aualyge The valve appeicability through installed test. The test results show that for a given drain hole diameter, the max injection valve lift is under the control of the location of drain hole. The greater the control pulse width, the longer the injection duration and the greater the intake air flow. Increasing hydraulic pressure is beneficial to improve the valve opening and closing responsiveness, and increase the injection valve intake air flow. For a given geometry of injection valve, the hydraulic pressure has a great influence on lift and delay characteristics. The influence low between injection valve related parameters and injection valve characteristics provides a reference for the optimization of the ECU control strategy and can also provide a scientific basis for the practical application of dual fuel engines.