课程设计老师让用PID控制对一传递函数进行控制仿真,最简单的那种,但加入微分项时,要不就出问题,“Derivative input 1 of block 'liujinkun/Transfer Fcn1' at time 6.092645358956879e-017 is Inf or NaN. Stopping simulation. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances),”要不仿真曲线就只出来一部分,实在头疼,不知道问题出在哪?是仿真参数设置不对嘛?由于初次用到simulink,不太懂,还请各位达人给予指点。:@D