摘要
在某涡轮增压发动机性能试验中,高转速降至低转速时涡轮增压器电控废气旁通阀反馈的全关电压过小,发动机扭矩下降。通过分析电控废气旁通阀结构及控制逻辑,明确问题根源在于废气旁通阀机构运动阻力过大,当发动机转速较高时电子执行器持续占空比下提供的扭矩不足以关闭废气旁通阀,此时触发电控废气旁通阀自学习,则会学到错误的全关位置。对故障增压器拆解分析并测量发现,废气旁通阀摇臂转轴同轴度、垂直度超差,导致废气旁通阀关闭过程中摇臂端面与衬套面异常摩擦,执行机构运动阻力增大。为保证涡轮增压器的可靠性,检测并统计批量增压器样件废气旁通阀关闭阻力,确定允许的最大旁通阀关闭阻力,并以此为依据校核电子执行器的扭矩输出。最后给出了电控废气旁通阀应用、检测及校核的一些建议。
In the performance test of a turbo-charger engine,the feedback voltage of the electronic waste gate of the turbo-charger is too low,when the engine speed drops from high speed to low speed,and it leads to engine torque decrease.By analyzing the structure and the control logic of electronic waste gate,it is clear that the root cause of the problem lies in the excessive movement resistance of the waste gate mechanism.When the engine speed was high,the output torque of electronic actuators under continuous duty cycle was not enough to close the waste gate.At this moment,the self-learning of the electronically controlled waste gate was triggered and the wrong fully closed position was learned.After disassembling,analyzing and measuring the fault turbo-charger,it is found that the coaxiality and the verticality of rocker arm of waste gate is out of tolerance,resulting in the abnormal friction between the rocker arm end face and the bushing surface during the closing process of the waste gate,and the motion resistance increases.In order to ensure the reliability of the turbo-charger,the closing resistance of the waste gate of turbo-charger samples was detected and counted,the maximum allowable closing resistance of waste gate was determined.Based on this,the output torque of the electronic waste gate was checked.Finally,some suggestions on application,testing and checking of electronic waste gate were given.
作者
黄振霞
姚源
田彤
马学文
HUANG Zhenxia;YAO Yuan;TIAN Tong;MA Xuewen(SAIC GM Wuling Automobile Co.,Ltd.,Liuzhou Guangxi 545007,China)
出处
《汽车零部件》
2022年第11期66-69,共4页
Automobile Parts
