Control And Drive Circuit Research For Electric Wheelchair

With the development of society and economy, the old and the disabled casused by disasters will gradually increase in China. It would be a huge socially disadvantaged group. While a well-off society is being built, it should give more care to the special group. Simple, environmentally friendly electric wheelchair will be the ideal vehicle for most of disable and old people who have difficult in walking. However, the electric wheelchair is very expensive at present, and these products have small radius understeer or have to switch sport mode by manual. This is not convenient. Therefore, to develop a convenient safe reliable and affordable electric wheelchair is important to improve disabled and old self-care ability and to reduce the burden of society and family.Through researching and analyzing the electric wheelchair research status at home and abroad and in domestic market, the main content of research is determined on this paper. It takes a two-axis joystick to output two control signals, and considers joystick’s control and wheelchair’s operation as a same coordinate system of two-dimensional. In this coordinate system, this paper discusses the running state of wheelchair and designs a new path planning scheme. It improves electric wheelchair small radius steering problems, and broadens the use scope of electric wheelchairs.This subject designs and develops each function module circuit for electric wheelchair. These circuits include power supply circuit, joystick signal acquisition circuit, battery voltage detection circuit, interface circuit of the motor, horn circuit etc. This paper determines the motor and reducer selection and check the parameters by calculated the design indexes of the electric wheelchair. By using Keil uVision4and J-Link, this paper develops and debugs the software program for control circuit. In order to ensure the reliable and efficient operation of the system, this subject completes the reliability design of hardware and software for system.Finally, this paper sets up an experimental platform to debug the control drive circuit of electric wheelchair. Through theoretical analyzing and observing on oscilloscope data and field experiment, the design of the path planning program for electric wheelchair is verified. Results indicate that the system is up to the original designing goal.