electrical and computer engineering preliminary design review team 22: driver assist

Electrical and Computer Engineering

Preliminary Design Review

Team 22:Driver Assist

2Electrical and Computer Engineering

Team 22 Members

Sam Burke –EESteve Cook –EEAndrew Klinkowski –EEQingchuan Wu –EE

Faculty Advisor : Professor Janaswamy


What is the Problem ?Current disabled driving assistance modules require the driver to have two functional handsThere are no devices on the market that allow drivers to fully control a car safely with one hand.

http://www.auto-handcontrols.com/knob_ford_lg.gif


How significant is the problem?According to the 2010 US census approximately 20 million people between ages of 21 – 64 live with a serve disability*

The NY DMV states “An examiner determines what is required and whether restrictions must be added to your driver license. The DMV can also require you to take and pass a road test to keep the driver license”*Needed assistance of another person to perform one or more IADLs (aged 15 and older). **http://dmv.ny.gov/org/driver-license/license-restrictions-medical-conditions


How significant is the problem? Currently there is no device that controls the gas,

brakes, and steering wheel No major car manufactures offer an option to

control the car with one hand On average it costs approximately $1500 to

install a driving assist module on a car This module is limited to controlling only the gas

and brake pedals, and requires an additional spinner knob


Effect On Individual Will give handicap drivers more functionality over

the car Will restore independence to individuals Reduce cost compared to conventional handicap

driving assist modules Will allow more citizens the opportunity to drive


Primary Solution Our solution is to create a

joystick that mechanically controls the steering wheel, brakes, and throttle as well as control over the blinkers, lights, and horn.

The joystick will pivot horizontally allowing the driver to turn left and right.

http://img.gizmag.com/onehandeddriving.JPG?fit=max&h=670&w=770&s=4af0a21ce275fd7e9e9c78f8c92c344c


Primary solutionA throttle will allow the driver to control the gas

A hand break will be used to stop the car

http://img.gizmag.com/onehandeddriving.JPG?fit=max&h=670&w=770&s=4af0a21ce275fd7e9e9c78f8c92c344c


Block Diagram

Control signal Joystick signal Feedback signalPower


Assignments

Steve: ThrottleBrakes

Sam: Steering motorJoystick

Qingchuan: PowerPID

Andrew: ControlJoystick


Joystick

Will Control:ThrottleBrake SteeringStretch Goals:SignalsWindshield WipersHornHeadlights


Controller Will include an Arduino and a PID Self calibrated Manage power consumption Stretch Goals: Arduino used to communicate with the

CAN-BUS (Computer Area Network) Signals sent from the Arduino will interface

with the car’s computer to control basic traffic signals


Motor Controller PID controller will be used for maintaining

the position of the steering wheel. Gas and braking power is proportional the

position of the hand brake and gas throttle. The position of the brake, gas, and steering

wheel will be fed back to the controller to minimize disturbance.

All the motors used will be synchronous motors


Mechanical Steering Create a wheel jacket that connects around

the steering wheel.• Wheel jacket will contain tracks• Motor behind steering wheel will link to tracks

Position of the steering wheel will be sent back to the controller

A “home” position will be placed on the track to assist calibration


Mechanical Steering A track will be

attached to a wheel jacket, and enable the motor to “grip” the wheel more effectively

A synchronous motor will be able to control the precision of the motor during static and dynamic use


Mechanical Gas & Break The gas and brakes

will be controlled using a linear actuator attached to each pedal

Response of the linear actuator will be dictated by the controller


Power A external battery will be used to power this

device External battery will be charged from the

cigarette lighter socket; the charging current will be limited to 15 Amps.

Polyphase inverter will be used to drive the motors


CAN-BUS The CAN-BUS can be used to access all the

electrical functionalities on modern cars Control for the turning signals, lights, and

horn can be accessed by sending a signal to the computer

In newer cars, controls are done by wire making it possible to control the gas and brakes as well


Requirements

• Steering Wheel Motor response time <50ms• 1.5 seconds per steering wheel revolution• Powerful enough to rotate steering wheel

while at stand still• Able to hold wheel in place while off center• Brake engagement time <350ms*• Giving computer decision time<50ms

• *http://www.visualexpert.com/Resources/reactiontime.html


Requirements

• Can not interfere with safety features (i.e. the airbag)

• Can not visually impair drivers ability to see road

• Power loss can not result in loss of controlStretch Requirements: Functionality over some electronic

components


Alternative JoystickThis joy stick will pivot horizontally allowing the driver to turn left and right. And triggers will be located on the back to control the gas and brake


Alternative SteeringControl the steering wheel through magnetic coils

Control the brake through pneumatics•Pneumatic piston have higher power

Control steering though the CAN-BUS for newer cars

Put a gear on the collar of the steering shaft which will be controlled by the motor


Proof of concept We will implement our

design on a virtual car. The xbox360 has a racing wheel car attachment which includes a steering column, brake pedal, and gas pedal.

We will attach our device on this and control the car in the video game

https://images-na.ssl-images-amazon.com/images/G/01/videogames/detail-page/sc_b005o6z028-01pedal.jpg


Cost 1 Throttle - $20 1 Hand brake - $10 2 Linear Actuator - $300 1 Wheel Motor - $100 1 Wheel Jacket and Track - $20 1 Printed Circuit Board $50 1 Joystick – $50 1 Arduino - $25 Electronic components $50 Estimated Total Cost $625


MDR Deliverables

Moveable components MotorsActuatorMove motors discretely from input


Questions

Questions?

electrical and computer engineering preliminary design review team 22: driver assist

Documents