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New Developments in Electric Vehicles for Disabled Persons, IEE Colloquium on

Date 17 Mar 1995

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Displaying Results 1 - 9 of 9
  • An obstacle avoidance system for an electric wheelchair

    Page(s): 4/1 - 4/4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (172 KB)  

    It has been suggested by wheelchair users that an obstacle avoidance system might be a useful accessory for an electric wheelchair. This paper examines the performance requirements of such a system, and discusses the range sensing techniques that could be used. Range sensing systems considered include ultrasonic, vision, and active light, of which ultrasonic and active light were selected for further investigation. Ultrasonic systems have been found insufficiently reliable in the detection of obstacles to be of use as the only range sensing system. An infrared light emitting diode triangulation system is under development, which seems to hold the potential for satisfactory performance at reasonable cost View full abstract»

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  • Electronic wheelchair controller designed for operation by hand-operated joystick, ultrasonic noncontact head control and utterance from a small word-command vocabulary

    Page(s): 3/1 - 3/4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (252 KB)  

    The majority of electric wheelchair users are able to operate a joystick to control the chair, however many more quadriplegic users need some other means of controlling the wheelchair. This paper describes an electronic PWM DC drive unit designed for operation by standard joystick, ultrasonic noncontact head control, and by command from a limited speech vocabulary View full abstract»

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  • SENARIO: SENsor Aided intelligent wheelchaiR navigatIOn

    Page(s): 2/1 - 2/4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (168 KB)  

    The SENARIO (SENsor Aided intelligent wheelchaiR NavigatIOn) aims to produce a marketable autonomous wheelchair which can be used by people with a severe temporary or permanent disability. The wheelchair will be able to take the user from place to place within a known environment. SENARIO is funded by the EEC under the TIDE (Telematics networks and services applied to the integration of the disabled and elderly) scheme. The project has been divided up into five subsystems: sensoring; user control; power control; positioning; and risk avoidance. The risk avoidance subsystem is the central unit, processing environment information from the sensoring, positioning and control panel subsystems, and sending commands to the power control subsystem to direct the wheelchair. The project is currently still in the planning stage, and a variety of options have been investigated for each subsystem. Here, the author presents an overview of some of the most suitable options View full abstract»

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  • Internal spur and pinion gear drive

    Page(s): 6/1 - 6/4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (168 KB)  

    A new mechanical gearing system based on an internal spur gear attached to each of the electric wheelchair's rear wheels, and accompanying pinion drive gears, is offered as an alternative drive type to the worm and worm wheel drive unit. The authors describe the main features of the internal spur gear including gear and pinion dimensions. The gear is driven by a PM DC motor View full abstract»

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  • Requirements of electric vehicles for disabled persons

    Page(s): 1/1 - 1/4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (132 KB)  

    Many disabled persons are totally dependent on electric vehicle systems for mobility within the home and for transport outside the home. The performance and reliability of these vehicles can have a very significant influence on the type of life and activity which disabled persons enjoy. The requirements of such vehicles can be varied and depends to a large extent on the disability of the potential user. Here, the author describes how certain requirements, however, which most vehicles would be expected to satisfy can be identified View full abstract»

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  • Assisting a disabled person in navigating an electric vehicle through a doorway

    Page(s): 5/1 - 5/6
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (296 KB)  

    A real time method of computer assistance for a disabled user/operator to move an electric wheelchair through a doorway is presented. The wheelchair uses data from ultrasonic sensors. These data are processed and combined with information from an input from the user; in this case a joystick. The output is used to assist the user/operator in steering the vehicle View full abstract»

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  • Developments in lead acid batteries and on-board chargers

    Page(s): 7/1 - 7/3
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (84 KB)  

    Oakdale Batteries Limited has developed an innovative state of the art power system which includes a lead acid battery and on-board charger system to give a maintenance free opportunity charging capability for electric wheelchairs. The requirements for the charger are divided into three categories: performance, user, and design/manufacture. The Oakdale battery technology and recharging technology are described and the operational characteristics discussed View full abstract»

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  • Ultra-fast nickel cadmium batteries charger

    Page(s): 8/1 - 8/5
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (188 KB)  

    Nickel-cadmium batteries are capable of accepting much higher recharging currents than supplied by conventional NiCad chargers. Sealed lead-acid batteries are still the most widely used batteries for powering electric wheelchairs. This paper presents a rapid charger with the capability of charging nickel-cadmium cells of combined voltage rating 24 V and with VA ratings of 7, 14, 21, or 28 Ah. The objective is to offer an alternative electric wheelchair power pack requiring a less than one hour recharge time interval View full abstract»

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  • IEE Colloquium on `New Developments in Electric Vehicles for Disabled Persons' (Digest No.1995/055)

    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (12 KB)  

    The following topics were dealt with: SENARIO (SENsor Aided intelligent wheelchaiR navigatIOn); electronic wheelchair controller; obstacle avoidance system for electronic wheelchair; internal spur and pinion gear drive; lead-acid batteries; Ni-Cd batteries; battery chargers View full abstract»

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