应用PTC自控温材料加热柴油机燃油的模拟计算

Simulation of Fuel Temperature of Diesel Engine Heating by PTC Materials

为了研究柴油发动机中PTC材料对柴油的加热效果,应用集中参数法建立了PTC加热系统以及受控对象温度变化的动态特性模型,并进行了加热效果的仿真分析。计算结果表明,利用PTC材料加热高压油管可以有效提高柴油温度,并总结出PTC材料加热高压油管内柴油的一般规律。

The PTC materials,as a kind of positive temperature coefficient materials,are used to heat diesel fuel in the high-pressure fuel pipe near the injector in diesel engine,which have a lot of characteristics,such as simple structure,safe and rapid heating,and stable heating temperature around its curie point.In order to study its heating effect on diesel fuel of the high pressure fuel pipe,the dynamical models for both the controlled object and PTC heater are presented by the way of lumped parameter,and the heating effects are also simulated and analyzed.The calculation results show that the diesel temperature is heated by the PTC materials effectively.Meanwhile,the heating law by PTC materials heating diesel fuel in the high pressure fuel pipe of engine is also summarized.