Design and Development of Experimental Teaching System for Diesel Engine SCR Low Temperature Thawing

To enhance experimental teaching in the field of internal combustion engines and strengthen students' understanding of diesel engine emission after-treatment technology and SCR application characteristics in high-latitude regions, this paper presents the development of an experimental teaching equipment focused on low-temperature defrosting phenomena and coping strategies for diesel engine SCR systems. The equipment consists of an SCR system installation frame and a mobile heat source control console, equipped with a controllable vibration device to simulate actual vehicle operating conditions, and is closely integrated with simulation software, ensuring the experiment's authenticity, visibility, and expandability. During the teaching process, students observe and operate under various coolant flow rates and heater types to study urea defrosting patterns, while using data analysis software for visualization. This approach deepens their understanding of SCR system operation modes and urea phase change and injection processes at low temperatures, enabling them to master basic experimental operations and data processing methods in the field of internal combustion engines, thereby comprehensively improving their practical skills and theoretical knowledge.