摘要
冷却系统控制水温是内燃机多水温试验的关键。发动机用大循环冷却,水箱隔热、内装浮球阀。由假设排泄部分冷却水与补充等排泄量的冷水使箱内水温稳定,且经传热分析,得出冷却水排泄量计算式。系统用旁通阀手动排泄经测算的冷却水量,用浮球阀自动补充等排泄量的冷水,控制冷却水温;并通过改变箱内水温和排泄量,控制另一冷却水温。台架试验结果表明,汽油机在4 500 r/min和54 N.m时,水温50℃在21 min内的控制精度≤+0.7℃,在30～95℃之间六种设定水温的控制精度≤0.2℃。此系统可控制内燃机所需任一冷却水温。
The cooling system controls coolant temperature is the key to IC engine bench test at multi-point ones. The engine cooled in big-circle. There was a float valve in water tank with heat insulation layer. From hypothesis of its draining some coolant and adding colder water equal to one to stabilize water temperature, the tank obtained the calculation formula of drained coolant flow after heat transfer analysis. The system controlled a coolant temperature by draining manually reckoned coolant flow with bypass valve and adding automatically colder water equal to it with float valve, and another one by changing water temperature in tank and drainage flow. The bench test results show that the coolant temperature control accuracy is within ＋0.7 ℃at 50 ℃ in 21 min and 0.2 ℃ at six-point temperatures set between 30 ℃ and 95 ℃ when gasoline engine runs at 4 500 r/min and 54 N . m. This system can control any coolant temperatures required by IC engine.
出处
《内燃机》
2013年第1期30-33,共4页
Internal Combustion Engines
关键词
内燃机
冷却系统
水温控制
试验研究
应用
IC engine
cooling system
multi-point coolant temperature control
test study
application
