how can we solve ode when control input changes ?

Suppose we have a 9 state system which we would like to control by using control u1 and u2.In step1 we choose u1=0 and u2=1 to make say state x4=1.In step we use u1=1 and u2=1 to make state x7=0 whilst keeping x4=1,in step3 we take u1=-1 and u2=0 to make x4=0 whilst keeping x7=0 and in step4 we take u1=-1 and u2=-1 to make x1=0 whilst keeping x4=0. the result must be plotted at the end when x1,x4 and x7 have reached zero.