基于Arrhenius方程的电动汽车减速箱油寿命预测

PREDICTION OF LUBRICATING OIL LIFE FOR ELECTRIC VEHICLE REDUCER BASED ON ARRHENIUS EQUATION

为了准确预测润滑油的剩余使用寿命,指导润滑换油周期的制定,对电动汽车减速箱油在高温热氧化条件下的酸值变化进行了考察;并基于Arrhenius动力学方程,绘制润滑油酸值随温度变化率的线性回归曲线,计算润滑油的氧化反应活化能和频率因子;进而建立不同温度下润滑油的理论寿命模型,并利用该模型评估了电动汽车减速箱高速和高负荷实际耐久应用试验后的油品使用寿命。结果表明:随着氧化温度的升高,润滑油酸值会迅速增大;氧化温度每升高20℃,油品的寿命会缩短65%~85%。经高速实际耐久应用试验和高负荷实际耐久应用试验后,电动汽车减速箱油仍有90%以上的理论寿命。基于Arrhenius方程建立的润滑油寿命模型预测值与试验测试值吻合较好,可用于评估润滑油剩余使用寿命。

In order to accurately predict the remaining service life of lubricating oil and guide the formulation of lubrication oil change cycle,the acid number change of lubricating oil for electric vehicle reducers under the condition of high-temperature thermal oxidation was studied.Based on the Arrhenius equation,a linear regression curve was drawn to calculate the oxidation activation energy and frequency factor,a theoretical life model of lubricating oil at different temperatures was established and used to evaluate the service life of lubricating oil after high-speed and high load endurance test of electric vehicle reducers.The results showed that the acid value of lubricating oil increased rapidly with the increase of oxidation temperature.When oxidation temperature increased 20℃,the service life of lubricating oil would shorten by 65%-85%.After the high-speed and high-load practical durability tests,the theoretical service life of lubricating oil was still over 90%.The predicted values of the life model based on the Arrhenius equation were in good agreement with the test values,which could be used to evaluate the remaining service life of lubricating oil and guide the formulation of oil change cycle.