In the upcoming Sections 3.1–3.7, seven assistive strategies
will be presented in which we have collocated the robotic devices
from the analyzed literature. Sensitivity amplification control
(Section 3.1) is more applied to THKAF exoskeletons to
augment wearer’s load carrying ability. Predefined gait trajectory
control (Section 3.2) is easier to implement, but forces the user
to walk in a reference gait which may be not natural. Modelbased
control (Section 3.3) is popular in various applications, but
it needs an accurate modeling of the coupled human/exoskeleton
dynamic system. Adaptive oscillators-based and Fuzzy controllers (
Sections 3.4 and 3.5) represent adaptive models which recursively
follow user’s intended movements, respectively relying on the periodicity
of the gait pattern (hence extrapolating the future posture
of the limbs) and on a preset fuzzy-logic layer. In a predefined action
based on gait pattern (Section 3.6) control framework, the recurrent
gait phase transitions are used to regulate the controller’s
action, resulting in a flexible interaction. Hybrid assistive strategy
(Section 3.7) have been addressed in order to recognize an effective
robotic control with two or more control methods.