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APW Air Powered Wheelchair. Team: Aaron Breault Bryant Langley Keith Willis. Background. Electric Wheelchairs have limited range Require a recharge that takes 8-14 hours Have difficulties functioning in wet and hot conditions Short battery life of abou t 6 months
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APWAir Powered Wheelchair Team: Aaron Breault Bryant Langley Keith Willis
Background • Electric Wheelchairs have limited range • Require a recharge that takes 8-14 hours • Have difficulties functioning in wet and hot conditions • Short battery life of about6 months • Battery replacement cost of $240 or greater
Problem Statement • To design a pneumatic powered wheelchair that has the capability to be “refueled” quickly • Has to have the ability to move a person of 300 pounds at least • Has to incorporate variable speed control • Needs to be able to be reversible • Needs to be able to achieve a maximum speed of 10 mph • Needs to be able to be controlled precisely
Different Types of Motors • Radial Piston • Axial Piston • Rotary Vane
Our Solution • Inline Pneumatic Piston motor • Stepper Motor controlled steering • PLC control • Air tank with flow rate control and capacity monitoring system
System Diagram Aaron Bryant Keith Steering System Pressure & Flow Rate Control System Pneumatic Motor Control System
System layout AirPiston Air Tank Connectingrod Flow rate controller Chair Stepper Motor Joystick Controller Crank shaft Airsolenoid Steering Wheels Driving wheels