为免耕播种机开沟深度自控系统开发做铺垫,该文设计了一种开沟深度自动控制系统室内试验台,该试验台由检测单元、控制器、驱动板、液压系统、调节机构、开沟器等组成,实现了开沟深度跟踪控制.试验结果表明:当开沟深度相对期望开沟深度过深或过浅50 mm时,其稳态响应时间分别为0.48与0.6s,误差均小于10mm;当地表模拟板起伏坡度较小或较大(电机转速分别约为10或25 r/min)时,动态响应误差分别在-30～30 mm、-60～40 mm范围内.所设计的开沟深度自控系统试验台可模拟动、静态响应试验,系统稳定,控制策略有待进一步研究以减少静态响应时间与动态响应误差.%To develop an automatic depth of furrow opening control system for no-till seeders, an automatic depth of furrow opening control system for indoor test-bed was designed. It was made up of a measuring unit, a controller, a driving board, hydraulic system, adjusting mechanism, an opener, and so on. And it achieved tracking control of the depth of furrow opening. The results indicated that when the depth of furrow opening was 50 mm deeper than the desired value, the steady-state response time was about 0.48 s ,and when that is shallower than the desired value ,the steady-state response time was about 0.6 s, The maximum error of them both were less than 10 mm. The results also showed that when the undulation slope of surface imitating board was smaller(motor speed was about 10 r/min), the dynamic response error was limited to -30-30mm ,when that was bigger (motor speed was about 25 r/min), the dynamic response error was limited to -60-40 mm. The imitating static and dynamic response experiment could be carried out based on this test-bed for automatic depth of furrow opening control system, while control strategy should be studied further to decrease time of improve the performance of the system.
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