Article Title,Year,Volume,Issue,Page Range,Author Novel straight road driving control of power assisted wheelchair based on disturbance estimation of right and left wheels,2006,126,6,764-770,Seki Driving control for electric power assisted wheelchair based on regenerative brake - Realization of safety driving using variable duty ratio,2008,128,2,137-144,Seki Downward slope driving control for electric powered wheelchair based on capacitor regenerative brake,2010,130,2,207-214,Seki