节温器作为发动机冷却系统中的自动调温装置，其工作稳定程度直接影响着发动机的工作性能。目前针对机械式节温器的性能检测方法存在着测量数据不完备、测量精度较低、安全隐患大及操作不便的问题。为解决这些问题，利用激光测距技术以非接触的方式实时测量节温器升程值，同时通过温度传感器获取对应的实时温度，从而获取反映节温器性能的完备数据。该方法是一种准确、安全、便捷的非接触式检测方法，温度测量精度达0.1 ℃，升程测量精度为1 mm。通过构建的检测系统对解放J6节温器进行了实验验证，结果表明该系统能够准确高效地实现节温器性能检测, 包括温度稳定性、性能一致性、故障判断标准等，适用于发动机日常维修及教学实践工作。

Thermostat, as the automatic temperature control device of the cooling system of the engine, has an important effect on the engine. In order to solve the problems in traditional mechanical thermostat performance detection, such as data deficiency, low measuring accuracy, high security risk, and inconvenience to operate. We find a non-contact way to get the real time lift of the thermostat based on laser ranging technology, and get the synchronous temperature by the temperature sensor. In this way, we can obtain the complete data of the thermostat. This method is an accurate, safe, convenient, and non-contact way, temperature measurement accuracy is 0.1 °C, and lift measurement accuracy is 1 mm. We setup a thermostat detection system and verify it by experiments with the Jiefang J6 thermostat. The result shows this system can detect the performance of thermostat accurately and efficiently, such as temperature stability, performance consistency, and fault diagnosis criterion. It is applicable to ordinary engine maintenance as well as educational practices.