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. 2014 Dec 1;8:947. doi: 10.3389/fnhum.2014.00947

Figure 2.

Figure 2

General control scheme, with a feedback control that calculates the error and provides a control input, and a feedforward control that directly contains the desired values and provides another control input. Both inputs are combined into a single control fed to the exoskeleton actuators. Measures of the current state are fed back to the controller. The interaction with the environment acts like a disturbance on the exoskeleton control algorithm.