| 摘要:根据热气机运行特点、控制参数要求和成本控制要求，设计一种基于PIC18F6722单片机的K型热电偶温度测量方法。单片机在0~600 ℃时采用查表法计算热电偶温度，在600~750 ℃时采用拟合线性化方法计算热电偶信号温度。在3 000 h的热气机可靠性试验中，在630 ℃、670 ℃和700 ℃等3个热气机额定工况运行点上，该方法能将热气机管壁温度控制在±2 ℃内，且成本较低，满足设计要求。 |
| 关键词: K型热电偶 温度 测量 高精度 |
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| Temperature Measurement of the High Precision Multi-Channel K-Type Thermocouple |
| CAO Yi,ZONG Qing,FU Jifeng,WAN Sheng,SHI Jian |
| Shanghai MicroPowers Co., Ltd., Shanghai 201203, China;Shanghai Marine Diesel Research Institute, Shanghai 201203, China |
| Abstract:Based on the operating characteristics，control parameter requirements，and cost control requirements of Stirling engines，a K-type thermocouple temperature measurement method based on PIC18F6722 single-chip microcomputer was designed.The single-chip microcomputer used a table lookup method to calculate the thermocouple temperature at 0600 ℃，and a fitting linearization method to calculate the thermocouple signal temperature at 600750 ℃.In the 3 000 h reliability test of the Stirling engine，this method could control the wall temperature of the Stirling engine within ±2 ℃ at three rated operating points of 630 ℃，670 ℃，and 700 ℃，the cost was low，and could meet the design requirements. |
| Key words: K-type thermocouple temperature measurement high-precision |
