DMP Differences in Material Properties) often exists between temperature sensors and combustion chamber components of ICE (Internal Combustion Engine), resulting in IEs (Introduced Errors) in the temperature measuring process. In this paper, we present a comprehensive theoretical analysis of the correlation between introduced errors on chamber components and the DMP. The analysis process considers the characteristics of the chamber's heat transfer BC (Boundary Condition). Then, simulations are used to investigate the introduced error of hardness plug and thermocouple sensors on the top surface of an ICE aluminum alloy piston. The theoretical analysis results indicate that heat transfer BC can be segmented into the time-averaged and fluctuation parts, and IEs are linearly superimposed under these two parts of BCs. The heat conductivity impacts the time-averaged error and the product of heat conductivity, density, and heat capacity impacts the fluctuation error. The experimental and simulation results indicate that the max time-average error of the hardness plug on piston is 2.4 °C, with a fluctuation introduced error of 3.6 °C and a total introduced error of 6 °C; and the time-average introduced error of thermocouple sensor is 9.4 °C, with a fluctuation error of 5.8 °C and a total introduced error of 15.2 °C. Finally, a fluctuation error correction method is proposed to reduce error. After correction, the error is reduced by 71 % and 66 % for hardness plug and thermocouple, respectively.

中文翻译：

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内燃机活塞表面温度测量引入误差的理论和数值研究

DMP (Differences in Material Properties) 温度传感器和 ICE（内燃机）燃烧室部件之间经常存在问题，导致温度测量过程中出现 IE（引入误差）。在本文中，我们对腔室组件引入的误差与 DMP 之间的相关性进行了全面的理论分析。分析过程考虑腔室传热BC（边界条件）的特性。然后，通过仿真研究了ICE铝合金活塞顶面的硬度塞和热电偶传感器引入的误差。理论分析结果表明，传热BC可分为时间平均部分和波动部分，且IE在这两部分BC下线性叠加。导热率影响时间平均误差，导热率、密度和热容的乘积影响波动误差。实验和仿真结果表明，活塞上硬度塞的最大时均误差为2.4℃，波动引入误差为3.6℃，总引入误差为6℃；热电偶传感器的时均引入误差为9.4℃，波动误差为5.8℃，总引入误差为15.2℃。最后，提出了一种波动误差校正方法来减少误差。校正后，硬度塞和热电偶的误差分别减少了 71% 和 66%。