| 段伟,牛贝妮,孔峻青,等.运行参数对燃油稀释机油影响的研究[J].内燃机工程,2022,43(2):64-70. |
| 运行参数对燃油稀释机油影响的研究 |
| Study on the Effects of Operating Parameters on Oil Dilution |
| DOI：10.13949/j.cnki.nrjgc.2022.02.008 |
| 关键词:混合动力 汽油缸内直喷 燃油稀释 喷油起始相位 监控模型 |
| Key Words:hybrid power gasoline direct injection（GDI） fuel dilution initial injection phase monitor model |
| 基金项目:吉林省科技发展计划项目（20200403150SF） |
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| 摘要:基于某混合动力车型，通过发动机台架和整车转鼓进行燃油稀释机油试验分析了冷却液温度、喷油起始相位、电池荷电状态（state of charge， SOC）和车辆运行循环对燃油稀释机油的影响。结果表明：冷却液温度为影响燃油稀释机油水平的主要因素，喷油起始相位为次要因素。冷却液温度低于50 ℃时，机油稀释率较高；喷油起始相位约为上止点前325°时，机油稀释率较低。在环境温度低于0 ℃时，发动机单次运行时间较短或者车辆单次短距离行驶有可能恶化燃油稀释机油水平，其中电池SOC约为37%时机油稀释率较高，电池SOC约为15%时机油稀释率较低。提出了一种机油稀释的监控模型，经过车辆转鼓和实际道路验证，该模型可较准确地预估机油稀释率。 |
| Abstract:Based on a hybrid power vehicle， the effects of coolant temperatures， initial injection phases， battery states of charge（SOC） and vehicle operation cycles on oil dilution were analyzed by engine bench tests and chassis tests. The results show that the coolant temperature is the primary factor for oil dilution， and the initial injection phase is the secondary factor. When the coolant temperature is below 50 ℃， the oil dilution ratio is relatively high. However， the oil dilution ratio is low when the initial injection phase is about 325° before top dead center. Oil dilution may also be deteriorated by the case of short engine run time or short vehicle distances when the ambient temperature is below 0 ℃. At the same time， when the SOC of battery is about 37%， the oil dilution ratio is relatively high. And when the SOC is about 15%， the oil dilution ratio is relatively low. An oil dilution monitor model has been put forward to evaluate oil dilution rate， and the accuracy of the model has been verified in vehicle chassis tests and real road tests. |
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