车辆引擎盖作为车辆发动机工作状态下，汽车上表面重要的红外特征识别部位，其温度场的研究对准确构建车辆整体的温度场和车辆的红外探测与识别均有着重要的意义。本文提出了一种车辆引擎盖温度场的建模方法。基于热平衡方程，对车辆引擎盖的传热进行分析推导，建立出引擎盖的温度分布模型和温度数值模型。并以实际实验的测量数据和环境情况为基础，设置模型仿真的边界条件。在仿真计算过程中，分别以不同类型的民用轿车引擎盖为对象，重点讨论并验证了引擎盖内部空气夹层对引擎盖模型计算结果的影响。研究结果表明，在引擎盖温度场建模和仿真计算过程中，空气夹层的存在对模型计算结果的准确性有着较大的影响。且车辆引擎盖越复杂，空气夹层对模型计算结果的准确性影响就越大。针对空气夹层的影响，本文提出一种分层的处理方法。对比实验和仿真结果，结果表明该方法较好地解决了空气夹层对模型计算结果的影响。

When a car engine operates, the hood is an important infrared recognition feature on the car’s upper surface. The study of the temperature field of the hood has vital significance for car infrared detection and recognition. This paper proposed a modeling method for the temperature field of the car hood. Based on the heat balance equation, the heat transfer of the vehicle hood is analyzed, and the temperature distribution model (together with the numerical model of the hood) is established. The corresponding boundary conditions of the model are established on the basis of the experimental environment of the car to obtain the simulation results of the hood’s temperature field. Using different vehicle hoods as objects in the simulation, the effect of the air interlayer on the accuracy of the hood model calculation is discussed. The results show that in the modeling and simulation of the hood, the treatment of air interlayers has great influence on the accuracy of the calculation results. The more complex the vehicle hood is, the greater the influence on the accuracy of calculation results. Based on the influence of air interlayers, a layered processing method is proposed in this paper. A comparison of the experimental and simulation results shows that the proposed method can better address the influence of air interlayers on the model results.