Systems for controlling multiple actuators

[0036] The invention having been generally described, the following examples are given as particular embodiments of the invention and to demonstrate the practice and advantages thereof. It is understood that the examples are given by way of illustration and are not intended to limit the specification or the claims to follow in any manner.

[0037]FIGS. 7-10 illustrate different operations of the heating unit of a nitrogen pumping system like that shown in FIG. 1 using the actuator control system described in this application. Each figure plots various parameters of the heating unit as a function of time. More specifically, in each figure, line 500 represents the change in pressure of the overall system, line 502 represents the change in the position of the cryo valve (i.e., the second actuator), line 504 represents the change in the cryo valve pressure, line 506 represents the change in the position of the hydraulic heater valve (i.e., the first actuator), and line 508 represents the cha