Executive Summary - School of Engineering Science
Contents
1. Page 9 DeSIGN SUTLAWS Acceleration to half speed motor only Set assist speed to 15 km h Manually increase speed to 3 km h At 3 km h motor should engage and provide a smooth acceleration up to 15 km h Motor will maintain speed of 15 km h both along a flat road and up a 7 grade Acceleration to full speed motor only Set assist speed to 30 km h Manually increase speed to 3 km h At 3 km h motor should engage and provide a smooth acceleration up to 30 km h Motor will maintain speed of 30 km h along a flat road Acceleration to half speed motor and manual Set assist speed to 15 km h Pedal at comfortable rate At 3 km h motor should engage and smoothly assist bicycle up to 15 km h while pedaling Continue pedaling to 20 km h motor should have disengaged past 15km h Stop pedaling and motor should smoothly reengage when speed again reaches below 15 km h Acceleration to full speed motor and manual Set assist speed to 30 km h Pedal at comfortable rate At 3 km h motor should engage and smoothly assist bicycle up to 30 km h while pedaling Pedal to 35 km h and then stop pedaling motor should have disengaged at 30 km h As speed dips below 30km h motor should smoothly reengage to maintain a speed of 30 km h Motor shut off on braking Set assist speed to 30 km h Manually increase speed to 3 km h At 3 km h motor should engage and begin smoothly accelerating bicycle At 15 km h2. The requirements set out in this document specify the minimal features required in a successful Ranger prototype Modifications will be made by Design Outlaws to the user interface performance criteria and reliability restrictions as necessary and as additional needs surface during product development At the same time the safety regulations and target functionality are static requirements We at Design Outlaws feel that design and implementation of the functionality set out in this document is achievable by December 2001 and will result in a successful product for our team and for outside parties as defined in our initial proposal 11 8888 UNIVERSITY DRIVE 6 BURNABY V5A 1S6 O6 TEL 604 320 0701 6 FAX 604 291 4951
3. Page 2 JTLAWS DESIGN 1 3 Intended Audience This document is intended for designers design engineers and managers to use in the design process of the development of the Ranger The Project Manager will use this document as a guide in timeline development goal setting and test acceptance The marketing department may also use this document to secure funding when an interested investor requires more information 2 8888 UNIVERSITY DRIVE 6 BURNABY V5A 1S6 TEL 604 320 0701 6 FAX 604 291 4951 Ranger Functional Specification Page 3 BUTLAWS DESIGA re teg 2 System Overview rror Reference source not found illustrates the overall system of the Ranger bicycle Digitol LCD Speed Seri s Sere Broke Serm Pottery HEE ineiceoter Je Miolo Eatery Bark A 00 E Figure 1 Electric Bicycle System Diagram This device incorporates an electric motor operating with a rechargeable battery source into a regular adult bicycle The user will be able to view system parameters and statistics on a LCD screen mounted on the handlebars The user will be able to select a target motor assisted commuting speed between 0 30km hr Then if the user engages the motor with a separate switch and begins pedaling the motor will engage to accelerate the bicycle to that target speed The acceleration wil
4. pull brakes motor should immediately disengage Release brakes motor should smoothly reengage acceleratin up to 30 km h At 30 km h pull brakes motor should immediately disengage Release brakes motor should smoothly reengage accelerating up to 30 km h 9 8888 UNIVERSITY DRIVE 6 BURNABY V5A 1S6 TEL 604 320 0701 6 FAX 604 291 4951 Ranger Functional Specification Page 10 0 07 0 oo m 7 JTLAWS DESIGI Motor shut off on disengage switch Set assist speed to 30 km h Manually increase speed to 3 km h At 3 km h motor should engage and begin smoothly accelerating bicycle At 15 km h move motor engage switch to off position motor should immediately disengage Move switch to on position motor should smoothly reengage accelerating up to 30 km h At 5 km h move motor engage switch to off position motor should immediately disengage Move switch to on position motor should smoothly reengage accelerating up to 30 km h Change pre settable speed while in motion Start with target speed set to Okm h Begin pedaling past 3km h motor should not engage Continue pedaling at speed above 3km h but below 5km h Increase target speed to 5km h through Mode 1 of User Interface this is accomplished with one button push Motor should engage as new speed is selected similar to the fashion in which treadmill speed increases are selected and applied i e without further input Repeat te
5. DESIGA UTLAWS September 27 2001 Dr Andrew Rawicz School of Engineering Science Simon Fraser University Burnaby BC V5A 156 Re ENSC 340 Functional Specification for the Ranger Electric Bicycle Dear Dr Rawicz Attached you will find Functional Specification for the Ranger Electric Bicycle prepared by Design Outlaws This document lists the functional requirements for the design and implementation of our ENSC 340 project We are in the process of defining and designing an electrically assisted bicycle that maintains a user settable speed There are currently no patents for the technology we propose Our design will comply with new regulations for electrically assisted bicycles as defined in April 2001 by Transport Canada Of all the North American regulations concerning electric bicycles these are the most restrictive and appear as requirements in this document We have included a test plan for correct operation and compliance with regulations and other requirements as defined in the functional specification Rhiannon Coppin Eric Hennessey Samuel Hu and Eric Keung are the Design Outlaws Please feel free to contact us with any questions or concerns through outlaws ensc sfu ca Sincerely Rhiannon Coppin Project Manager Design Outlaws Enclosure Functional Specification for the Ranger Electric Bicycle 8888 UNIVERSITY DRIVE 6 BURNABY V5A 1S6 TEL 604 320 0701 6 FAX 604 291 4951 DESIGN UTLA
6. WS FUNCTIONAL SPECIFICATION FOR THE RANGER ELECTRIC BICYCLE Project Team Contact Personnel Submitted to Date Issued Revision 8888 UNIVERSITY DRIVE 6 BURNABY V5A 1S6 TEL 604 320 0701 6 FAX 604 291 4951 Design Outlaws Rhiannon Coppin Eric Hennessey Samuel Hu Eric Keung Rhiannon Coppin acopppin sfu ca Dr Andrew Rawicz Steve Whitmore School of Engineering Science Simon Fraser University September 27 2001 1 0 DeSIGN SUTLAWS Executive Summary As city streets become more congested fuel prices continue to rise and air pollution increases in severity people are demanding a more convenient inexpensive and healthy transportation alternative Design Outlaws have determined that one of the most promising alternatives for many lifestyles is the electric bicycle Therefore our mission is to make the electric bicycle a more attractive commuting option After surveying the current state of electric bicycle technology we concluded that the following features are urgently required in order to increase public acceptance of electric bicycles 1 The electrical motor needs to take effect smoothly providing a gradual and natural feeling acceleration 2 The user must be able to preset their target speed and have the motor compensate for pedaling deficiencies 3 The motor must turn off when the bicycle exceeds the selected speed past which the user must power the bicycle Features that have al
7. e to the specific legal implications of this class which is not considered the same as a motorcycle The Motor Vehicle Safety Regulations Subsection 2 1 define the following requirements 7 8888 UNIVERSITY DRIVE 6 BURNABY V5A 1S6 TEL 604 320 0701 6 FAX 604 291 4951 Ranger Functional Specification Page 8 pe 4 LI JTLAWS DESIGI power assisted bicycle means a vehicle that a has steering handlebars and is equipped with pedals b is designed to travel on not more than three wheels in contact with the ground C is capable of being propelled by muscular power d has an electric motor only which has the following characteristics namely i it has a continuous power output rating measured at the shaft of the motor of 500W or less ii if it is engaged by the use of muscular power power assistance immediately ceases when the muscular power ceases iii if itis engaged by the use of an accelerator controller power assistance immediately ceases when the brakes are applied and iv itis incapable of providing further assistance when the bicycle attains a speed of 32km h on level ground e bear a label that is permanently affixed by the manufacturer and appears in a conspicuous location stating in both official languages that the vehicle is a power assisted bicycle as defined in this subsection and f has one of the following safety features i an enabling mechanism to turn the electr
8. ic motor on and off that is separate from the accelerator controller and fitted in such a manner that it is operable by the driver or ii a mechanism that prevents the motor from being engaged before the bicycle attains a speed of 3km h Further requirements from California and Washington State laws are e The device will operate in such a manner so that the electric motor is disengaged or ceases to function when the brakes are applied or operate in a manner such that the motor is engaged through a switch or mechanism that when released will cause the electric motor to disengage or cease to function e The device will comply with the equipment and manufacturing requirements for bicycles adopted by the Consumer Product Safety Commission 16 C F R 1512 1 et seq 6 Test Procedure The Ranger bicycles must completely and successfully handle the following scenarios given that the battery is charged and connected to the bicycle and that the motor engage switch is in the on position This of course is not a complete list of all test procedures that will be followed Additional testing will be done during system development and a full safety procedure including testing with the bike on a stationary rig will be verified before any road tests are attempted 8 8888 UNIVERSITY DRIVE 6 BURNABY V5A 1S6 TEL 604 320 0701 6 FAX 604 291 4951 Ranger Functional Specification BS Bm 3595 BIO 2 222 Lee th
9. l be gradual smooth and feel natural and safe to the user As the user 3 8888 UNIVERSITY DRIVE 6 BURNABY V5A 1S6 O6 TEL 604 320 0701 6 FAX 604 291 4951 Ranger Functional Specification Page 4 JTLAWS DESIG increases the amount of pedaling the control system will reduce the motor output in order to maintain the target speed When travelling at speeds greater that the target speed for example when going downhill the motor will disengage and the motor will reengage once the speed drops a predetermined amount below the target speed When for example the user is tired and reduces pedaling the control system will allow for a specific drop in speed e g 5km h before triggering to motor to reengage The control system will sense the application of either brake and the motor will turn off when the brakes are applied 3 System Requirements 3 1 Physical Requirements The Ranger bicycle will be designed and implemented on a standard road bike that we hope to obtain via sponsorships Major components that must be included are as follows Drive System Electrically powered motor 500W output Rechargeable battery pack Control System Microcontroller Alkaline battery Speed sensor Brake sensor Battery Charge Sensor Display System Liquid Crystal Display Input push buttons Motor power switch 3 2 System Capabilities and Physical Features 3 2 1 General Overall weight including bicycle weight n
10. mode screens Figure 2 and Figure mockups of the LCD inputs and outputs for the two display modes 25 0 0 Figure 2 Mode 1 of User Interface 6 8888 UNIVERSITY DRIVE 6 BURNABY V5A 1S6 O6 TEL 604 320 0701 6 FAX 604 291 4951 Ranger Functional Specification Page 7 DESIGA In Mode 1 the top left hand number is the target speed in km h the top right hand number is the current speed in km h and the bottom vertical lines show the range of battery charge possible 2 lines in top row and the current state of charge series of lines in bottom row 16 1 km 0 hr 32 min 30 km hr Figure 3 Mode 2 of User Interface Mode 2 displays the total distance for the current trip the time taken and the average speed These are not user settable parameters 5 Regulatory Requirements 51 Specific Standards e The device will comply with CSA regulations e The device will comply with Transport Canada Motor Vehicle Safety Act e The device s electrical system will comply with Canadian and American National Electric Codes 5 2 Guidelines The current Transport Canada Motor Vehicles Safety Act has the most restrictive legislation in North America with regard to electrically assisted bicycles By complying with these regulations our design will comply with the less restrictive state specific US legislation Design Outlaws aims to have the device classed as a power assisted bicycle du
11. ot exceeding 16 kg Motor battery and control system are positioned such that they do not interfere with pedaling e Battery completely rechargeable in 8 hours 4 8888 UNIVERSITY DRIVE BURNABY V5A 1S6 6 TEL 604 320 0701 FAX 604 291 4951 Ranger Functional Specification Page 5 DESIGA 3 2 2 Operating Conditions Waterproof under severe rain puddle conditions Resistant to failure from caking drying of mud on frame and frame components The system will operate in ambient temperatures from 5 C to 35 C The system will survive frost and dew 3 2 3 Performance Top speed of 30 km hr on flat terrain or 15 km hr up a 796 grade Range of 30 km with full motor output on flat terrain 3 2 4 Safety The following is a list of features that we will include thereby maximizing the safety of the Ranger Drive System The maximum speed while the motor is engaged is 30 km hr The motor will be housed in a heat resistant removable casing Appropriate warning labels will also be included The motor will be mounted such that all moving parts are protected from the user Electrical wiring compliant with appropriate Canadian and US standards Control System Motor will engage only if the following conditions are satisfied e Motor switch is in on position e Brakes are not being applied e Bicycle is travelling at a speed of 3 km hr Display System Display will be mounted such that it is viewable under various ligh
12. ready been developed and are also desired in the Ranger are 1 Battery rechargeable through interface to an AC wall outlet 2 Speedometer and odometer 3 Smooth motor transmission 4 Limited top speed to comply with non motorized vehicle regulations The prototype which we have named the Ranger will incorporate all the above features and will be completed in December 2001 ii 8888 UNIVERSITY DRIVE 6 BURNABY V5A 1S6 TEL 604 320 0701 6 FAX 604 291 4951 DESIGN UTLAWS OET 1 Table of Contents iii 8888 UNIVERSITY DRIVE 6 BURNABY V5A 1S6 TEL 604 320 0701 FAX 604 291 4951 Ranger Functional Specification Page 1 JTLAWS DESIGI 1 Introduction The Ranger is an electric bicycle incorporating a rechargeable electric power source a variable torque and variable speed electric motor and associated control mechanisms The Rangers unique features include a pre settable speed control and smooth acceleration to the target speed in the presence or absence of external pedaling The Rangers control system will allow the user to pedal as with a regular bicycle and will determine the level of motorized output necessary to achieve and maintain the desired speed that the user selects through a digital interface The Ranger will function on various terrains and under severe conditions Finally the Ranger will incorporate all safety features as set out by various state and federal legi
13. slation in addition to the safety features deemed necessary by Design Outlaws 1 1 Scope This document describes the functional requirements for a prototype of the Ranger commuter bicycle This prototype will act as a proof of concept device and will allow for further feature developments which are briefly documented in the final section The requirements we have set forth for the prototype along with the consideration of future requirements both motivate the design of the Hanger 12 Referenced Documents 1 Proposal for Design and Implementation of Electric Bicycle Technologies Design Outlaws Rev 2 0 September 18 2001 2 MOTOR VEHICLE SAFETY ACT Regulations Amending the Motor Vehicle Safety Regulations Expiry Dates for Sections 108 131 and 206 Canada Gazette Part Vol 135 No 8 2001 04 11 Registration SOR 2001 116 29 March 2001 3 Bordonaro Senator Mountjoy coauthor An act to amend Sections 406 and 12804 9 of and to add Section 24016 to the Vehicle Code relating to vehicles TOPIC Motorized bicycle electric motor definition California Vehicle Code Measure A B No 1501 Chaptered Chapter 804 10 13 95 4 Thibaudeau Wood Haugen and Prince Senators Senate Bill 5968 Chapter 328 Laws of 1997 Electric assisted bicycles State of Washington Laws Effective Date 7 27 97 1 8888 UNIVERSITY DRIVE 6 BURNABY V5A 1S6 TEL 604 320 0701 6 FAX 604 291 4951 Ranger Functional Specification
14. st for remaining speed increments Documentation and User Manual Documentation for the production version of this device will consist of a ten page document including care and operating instructions This document will be accompanied by a province or state specific four page pamphlet of current laws regulations and restrictions for operation of the device The user manual will be written for an audience with little or no bicycle knowledge Parts of the bicycle and system will be named diagrammed and explained The operations pamphlet will include basic road regulations since the user is not required to hold a driver s license Minimal user training should be necessary for this device No guided user training should be necessary for experienced cyclists to safely operate this device Users of the proof of concept prototype will be instructed and supervised by the product developers during demonstration sessions and assume all liabilities 10 8888 UNIVERSITY DRIVE 6 BURNABY V5A 1S6 TEL 604 320 0701 6 FAX 604 291 4951 Ranger Functional Specification Page 11 gt 4 DESIGN ITLAWS 8 Future Developments Future designs implementations and productions of this device will satisfy some or all of the following requirements Selection of unit base on display km or miles Battery recharging from dual motor generator when motor not in use Interface to solar panel battery recharging 9 Conclusion
15. ting conditions and from different viewing angles 3 2 5 Reliability The Ranger will meet the following reliability requirements e Battery charge indicator will be valid to 5596 Velocity measurement will be valid to 2 km h Along flat terrain motor will maintain speed at 2 km h the preset value under condition of constant user input 5 8888 UNIVERSITY DRIVE 6 BURNABY V5A 1S6 O6 TEL 604 320 0701 6 FAX 604 291 4951 Ranger Functional Specification Page 6 DESIGA 4 User Interface Requirements 4 1 Interface Inputs The following is a list of buttons and sensors that will allow the user to provide the system with inputs On off button to control LCD On off switch to control motor Mode button to toggle the current display on the LCD Up down button to input and or reset information Sensor to detect application of brake For the prototype we the user will be able to increase or decrease the target speed in increments of 5km h using the up down button in the list above 4 2 Interface Outputs The following information will be displayed to the user via the liquid crystal display Current speed of travel in km h to one decimal place Target speed in increments of 5km h Distance traveled in km to one decimal place Time traveled in hour and minutes Average trip speed in km h to unit place Current charge of battery This information will be presented to the user through the use of two
Download Pdf Manuals
Related Search