摘要
根据某电控柴油机的工况特性，建立了车用电控柴油机电喷系统电子控制单元（ECU）热分析模型，并搭建试验系统验证了热分析模型的计算精度，最后应用电子设备热分析软件Icepak对特定工况下的ECU热负荷特性展开了分析研究。研究结果表明：ECU温升控制在30℃以内，元器件工作温度在32.0-49.9℃范围内，满足汽车电子元件许用工作温度范围；电路板上高温区集中在低压电源电路和主控单片机周边，高温区温差较大，热应力较大；自然流动条件下，ECU内部热流速度在0-0.04m/s之间，外部热流速度在0-0.17m/s之间。
In view of the potential safety hazards of ECU, a thermal analysis model of the electronic fuel injection system ECU was established according to the engine＇s working condition characteristics, which was verified by an experimental system to check the accuracy of the thermal analysis model. And then the ECU thermal load under specific working conditions was analyzed by using the Icepak. The result shows that the temperature rise of the ECU and the operating temperature of the components shall be kept within 30 ℃ and 32.0 ℃ to 49.9 ℃ respectively to meet the allowable working temperature range of the automotive electronic components. The high temperature regions on the circuit board concentrate in the low voltage power supply circuit and the main control chip nearby, in which the temperature difference is bigger and the thermal pressure is stronger; under natural flow conditions, the ECU internal heat flow velocity and external heat flow velocity shall be within 0.04 m/s and 0.17 m/s respectively.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2016年第4期187-193,共7页
Chinese Internal Combustion Engine Engineering
关键词
内然机
电控柴油机
电喷系统ECU
热负荷
热分析
IC engine
electronic controlled diesel engine
ECU for electronic fuel injection system
thermal load
thermal analysis
