重型柴油机空气滤清器技术状况监测方法

Study on Technical Condition Monitoring Methods of Air Filter of Heavy-duty Diesel Engine

针对目前对某重型柴油机空气滤清器检测方法单一、反映问题不全面的现状,通过分析空气滤清器结构,将整个滤清器的压降简化为3部分压降之和。运用流体力学分析,选择各部分压降计算公式,联立推导出了基于等效流通截面积的空气滤清器技术状况监测数学模型。通过台架和实车试验证明:该数学模型具有较好的稳定性和单调性,能够准确反映空气滤清器内部因尘土堆积而导致进气阻力增大、流通截面积减小的实际情况。运用该模型监测空气滤清器可合理安排清洗时机,对空气滤清器的及时保养和正常使用具有重要意义。

According to the present problem that detection methods of air filter of some heavy-duty diesel engine are too simple and can’t reflect the trouble entirely,the pressure drop of whole air filter is simpli-fied to the sum of pressure drop of three parts through analyzing the structure of air filter.A mathematic model used to detect technical condition of air filter based on equivalent flow section area is deduced by means of hydrodynamics analysis by using computational formula of pressure drop.And the mathematic model is proved to be stable and monotonous by gantry and real vehicle tests.What’s more,it can exact-ly reflect practical condition of increase of intake resistant and decrease of flow section area caused by dust deposit in air filter.Using this model to detect air filter can arrange the cleaning time of air filter properly,which is significant to the timely maintenance and normal work of air filter.