Question: How can I solve the differential equation with a delay condition

question1.3.mwI define a system differential equation, deq:=[equ1,equ2], and specifed input variable and output variable, then use command sys:=DiffEquation(deq,[A[ss]],T[m]).

Note that output variable T[m] is a delay function, T[m]=T[w](t-t[d]), where T[m] contained in equ2, and deq do not contains T[m].

When I add the delay condition T[m]=T[w](t-t[d]) to deq, and run the commands, then maple ruturns an warning:

'Warning, diff-eq is not a polynomial'.

I want to get the system transfer function, I leave out the warning,and use command tf:=TransferFunction(sys),then it ruturns an error:'Error, (in DynamicSystems:-TransferFunction) diff-eq is not a polynomial'.

Now, how can I solve this error? I want to get transfer function under the condition of output delay.

I am not good at English, and describing the complex problem is not easy for me.So I had uploaded the question.

Thank you in advance.