| 李睿,刘文仓,方晓飞.基于某混合动力电动汽车运行工况取消发动机机油冷却器的研究[J].内燃机工程,2025,46(4):159-171. |
| 基于某混合动力电动汽车运行工况取消发动机机油冷却器的研究 |
| Research on the Elimination of Engine Oil Cooler Based on Hybrid Electric Vehicle Operating Conditions |
| DOI：10.13949/j.cnki.nrjgc.2025.04.017 |
| 关键词:机油冷却器 混合动力 热平衡试验 油耗 |
| Key Words:oil cooler hybrid thermal balance fuel consumption |
| 基金项目: |
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| 摘要:为了研究混合动力电动汽车（hybrid electric vehicle， HEV）搭载升功率大于等于65 kW/L的汽油发动机取消机油冷却器的可行性，以某款混合动力专用高效增压发动机为对象，通过试验和仿真分析方法分析了发动机的运行工况，对比研究了发动机及整车在相同工况下取消机油冷却器前后的机油压力、热平衡、可靠性及燃油经济性的变化情况。研究结果表明：取消机油冷却器后，冷却系统冷却能力有所提升，在水温90 ℃时缸盖和缸体壁温分别约降低5 ℃和8 ℃；机油温度升高，机油黏度降低；发动机燃油消耗率可降低0.8%以上。在全球统一轻型车测试循环（world light vehicle test cycle， WLTC）工况下，取消机油冷却器后，暖机过程中机油温升速度降低了13.8%，冷却液温升速度提升了19.0%，整车油耗提升了0.29%。发动机取消机油冷却器后在HEV工况下机油温度超出限值和发生发动机失效风险的可能性较低，对整车综合油耗影响较小，可有效降低整车成本，提高市场竞争力。发动机台架热平衡试验可以评估HEV工况下发动机取消机油冷却器后安全运行工况与边界，并对部分HEV工况的发动机机油温度进行有效预测，可节约整车试验资源。 |
| Abstract:To investigate the feasibility of eliminating the oil cooler in a hybrid electric vehicle（HEV） gasoline engine with a power density of 65 kW/L or above， a high-efficiency turbocharged engine specifically designed for HEVs was selected as the research object. Through experimental and simulation analysis methods， the engine operating conditions were analyzed. The changes in oil pressure， thermal balance， reliability， and fuel economy of both the engine and the vehicle before and after eliminating the oil cooler under the same operating conditions were compared. The research results show that， the cooling capacity of the system improves without the oil cooler. When the coolant temperature is 90 ℃， the wall temperatures of the cylinder head and cylinder block decrease by about 5 ℃ and 8 ℃， respectively. Meanwhile， the oil temperature rises， oil viscosity decreases， and the specific fuel consumption of the engine can be reduced by more than 0.8%. Under world light vehicle test cycle（WLTC） conditions， after eliminating the oil cooler， the oil temperature rise rate during the warm-up process decreases by 13.8%， while the coolant temperature rise rate increases by 19.0%， and the fuel consumption of the vehicle increases by 0.29%. Eliminating the oil cooler presents a low risk of oil temperature exceeding limits or causing engine failure under HEV operating conditions， having minimal impact on overall vehicle fuel consumption while effectively reducing vehicle cost and enhancing market competitiveness. The engine dyno thermal balance test can evaluate safe operating conditions and boundaries for the engine without an oil cooler under HEV conditions and predict engine oil temperatures under certain HEV operating conditions， thereby effectively saving vehicle test resources. |
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