The influence of the change of the proportionality P value,the larger the proportionality,the weaker the proportional effect,which makes the transition process curve change slowly;the oscillation period lengthens;the attenuation ratio becomes larger.Therefore,when there is disturbance or changing the given value to make the curve recover slowly,the proportionality P value can be reduced.
◆Influence of integral time I:The strength of integral action depends on the size of integral time I.When I is large,the integral effect is weak,and when I is small,the integral effect is strong.The general trend of change is that the smaller I is,the stronger the integral action is,the more intense the curve oscillation is,the shorter the period,and the smaller the residual.But if I is too small,because the integral action is too strong,the curve will oscillate violently,but the time for eliminating the residual will be longer.
比例度P值变化的影响,比例度越大,说明比例作用越弱,使过渡过程曲线变化缓慢;振荡周期加长;衰减比变大。因此在有干扰或改变给定值使曲线恢复缓慢时,可将比例度P值变小。
◆积分时间I的影响:积分作用的强弱取决于积分时间I的大小。I大时,积分作用弱,I小时,积分作用强。一般变化趋势是I越小,积分作用越强,曲线振荡加剧,周期缩短,余差越来越小。但如果I太小,由于积分作用太强,会造成曲线剧烈振荡,反而使消除余差的时间变长。
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