液压自由活塞柴油机控制参数影响特性试验  

Experiments on Influencing Parameters of Hydraulic Free Piston Diesel Engine

作　　者：赵振峰[1] 张付军[1] 郭锋[1] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《内燃机学报》2014年第1期84-90,共7页Transactions of Csice

基　　金：高等学校博士学科点专项科研基金资助项目(20131101120019)

摘　　要：在研制的单活塞式液压自由活塞柴油机上开展了控制参数影响特性、启动特性及运行特性等规律性试验.结果表明:改变压缩压力可以实现压缩比的控制,随着压缩压力的增大压缩比将增大;循环喷油量、喷油正时和排气门正时等参数对自由活塞发动机的膨胀行程、压缩比和下止点位置等具有决定作用;频率控制阀信号脉宽影响发动机的启动过程,脉宽较小时会导致活塞运动速度减慢甚至启动困难.对其特性的研究结果表明:活塞运动规律呈明显的非对称性,膨胀行程用时较压缩行程短;缸内燃烧过程呈近等容燃烧;液压输出能量受单向阀响应性影响会损失掉一部分高压能.Experimental study on operating parameters, start-up characteristics and operating characteris-tics were investigated in a single-piston hydraulic free piston engine. Results show that compression ratio can be controlled by changing the compression pressure. Cycle fuel amount, injection timing, exhaust valve timing, compression ratio and position of bottom dead center have the decisive role. Pulse width of frequency control valve signal affects engine start-up process. Short pulse width slows the piston move-ment or even is hard to start-up. Piston motion is asymmetry where compression stroke is longer than ex- pansion stroke. Combustion process is nearly constant-volume combustion. Part of hydraulic energy output is lost because of slow response of valve.

关 键 词：柴油机 液压自由活塞 控制参数 特性 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]