本文介绍了双作用叶片式二次元件的结构和工作原理，分析了其节能原理和特点。
This paper presented the working principle and structure of the double-action vane pump, analyzed its mechanism of variable displacement and characteristics of energy saving.
仿真结果表明采用模糊PID自整定控制后使得二次元件输出动态响应性能大大改善，达到了预期的目标。
Simulation results implied that output dynamic response performance of secondary element improved greatly by adopting fuzzy auto-tuning PID control, the results attained expect aim .
这种装置可以自动测试柴油机在额定状态运行下的油耗率，并配合相应的一次元件能自动测试柴油机和增压器的转速。
This instrument can measure automatically the oil consumption at the normal rating and the r. p. m. of the supercharger and the diesel, fitting with the corresponding primary meter.
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