We consider singular optimal control problems consisting of a state equation

for vectors

and scalars

and a cost functional

to be minimized for

and

. By considering the problem as

, singular perturbation concepts can be used to compute solutions consisting of bang-bang controls followed by singular arcs. The procedure further develops a numerical technique proposed by Jacobson, Gershwin, and Lele [18], as well as additional analytic methods developed by other authors.