Design of Fuzzy Logic Control in Functional Electrical Stimulation (FES) Cycling Exercise for Stroke Patients

Weakness in muscle due its inability to conduct activities are often happened in stroke patients. Physiotherapy can be used to prevent this weakness, one of them is utilizing Functional Electrical Stimulation (FES). In this paper, fuzzy logic is designed to control the pulse width of FES to assist muscle in producing cycling movement as form of exercise for stroke patients. Monitoring of heart rate and oxygen saturation during exercise were also added. The designed system could produce crank speed output closed to desired output of 20 rpm with error of -0.739 rpm and pulse width output closed to desired output of 200 μs with error of 1.824 μs. The desired values were selected based on subject's crank ability and FES characteristics. Monitoring of heart rate and oxygen saturation shows insignificant result compared to relax state indicating that the workload from exercise is acceptable. Error reduction of controller and performance improvement or utilization of different parameter in monitoring could be done for next plan development.