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BATAAN PENINSULA STATE UNIVERSITY

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PEDAL CHARGING FOLDABLE

ELECTRIC BICYCLE

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I. INTRODUCTION

A bicycle, also known as a bike, is a pedal-

driven, human-powered, single-track vehicle, having

two wheels attached to a frame, one behind the other.

Because of peoples creativity and

innovative skills, modern types of vehicles now

exist and manufactured.

One of these is ELECTRIC BICYCLE.

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B.PROBLEM STATEMENT

Increasingly congested, polluted, stressful cities

caused by emission in some vehicles.

Currently produced electric bikes are very

expensive.

Carrying bike to other places is not convenient.

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C. NEED FOR PROJECT

The project study will combine

the electric and foldable concept ofbicycle and provide cheap way of

creating one.

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D. OBJECTIVES

General Objective:Develop, create and test a prototype of foldable

electric bicycle that can be charged through

pedalling.

Specific Objectives: Develop an effective means of transportation

with zero emission for short and long run such as

in work and around a provincial.

Test for acceptable overall performance of the

prototype.

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D. OBJECTIVES

Design, create a prototype of

electric bicycle that can be

charged through pedalling

Cheap way of

producing fromalready available

materials

Economical Pedal-Charging FoldableEnvironment -

Friendly

Reduce

consumption ofelectricity

Lessen

Pollution

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REQUIREMENTS

The design should be foldable for

convenient use.

It should have pedal charging capability toreduce consumption of electricity.

It should be at reasonable cost.

It must give physical benefits to improve

general fitness level.

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LIMITATIONS

The design is limited to 200 lbs. (90 kg)

weight capacity.

The design will not be tested for uphill.

It is good for one rider only.

It is not used in rainy days, wet road andmud.

It is only recommended for people who

understand the operation of the device.

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II. LITERATURE SEARCH

An electric bicycle is a bicycle with an attached motor

used to power the vehicle, or to assist with pedalling.

First electric bicycle

-U.S. Patent 552,271 on December 31, 1895 byOgden Bolton Jr.

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A folding bicycle incorporates special design

features enabling the bike to fold into a compact

form, thereby facilitating transport or storage.

First folding bicycle

-Pedersen bicycle by Mikael Pedersen in 1900

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US Patent 7055842 - Folding electric bicycleon June 6, 2006

Patents and Products in the market

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Sun Sail Electric Bike

Product Description

1) Battery: 2 x 12V / 7Ah

2) Power: 250W - 350W3) Brake: Rear disc brake, front

drum brake

4) Max. speed: 20km/h

5) Charger time: 3- 5 h

6) Max. capacity: 80 kg

7) Use time for one charger: 2 hr

8) Use distance: 30 km

9) Tire: 12.5 x 2.25

10) Product dimensions: 91 x 53 x

97cm

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Yike Bike

Spec Sheet

Weight: 9.8 kg (21 lbs)

Frame: Carbon composite

Price: Between 3,500 and 3,900

Drive: Electric chainless

Brakes: Electric anti-skid, regenSpeed: 20 km/hr

Power: 1.2 kW, 30min re-charge

Battery: LiFePO4 - fast charge

Range: 10 km

Fold size: Super compact 43 litres

Seat: Leather super comfort

Height: 163 cm - 193 cm limitWheel: 20 hubless

Weight limit: 100 kg

Lights: Built in LEDs

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ENGINEERING THEORIES

APPLIED

Mat ri

al ci c

Mac i D si

Ki atics

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IV. METHODOLOGY

Drive bicycle;

Charge batteriesPedal, Human energyPedal-charged

Electric Motor, BatteryMotor-driven

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IV. METHODOLOGY

Pedal, Chain and

Sprocket

Supply electricity

to motor

Convert rotary

motion to electricity

Transmit rotary

motionDrive Bicycle

Carry Weight Sustain Weight

Human Energy

Electrical energy

from battery

Kinetic Energy

from wheel

Weight

Mechanical

Energy

Charge battery

Mechanical Work

Rotate wheel

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IV. METHODOLOGY

Setup of device Solutions

Way of Folding Folded at middle Retraction

Lock/Joint Type Lock Jaw/ClampQuick Release

Clamp

Type of Electric

MotorStarter Motor Other DC motor

Charging Device

Mechanical

ChargerAlternator

Battery Li-ion Battery Lead Acid Battery

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C. DESIGN CONCEPTS

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DESIGN 2

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DESIGN 3

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The group decided to chose

design 3 because its style of folding is

different from the others. The othertwo designs were typical style of

foldable bikes available in the market.

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IV. METHODOLOGY

Experimental Procedures

Velocity and Acceleration Test

Measure 20-meter distance on plain and rough

road.

From starting line, start the electric bicycle andrecord the time it takes at each one meter distance.

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IV. METHODOLOGY


Charging Rate Test

Connect a bulb to the battery so it will serve as

indicator. If the bulb does not light, the batteries

are at low charge

Record for the initial voltage of the batteries.

Drive the bicycle.

Record the time and additional voltage on the

batteries.

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IV. METHODOLOGY


Folding and Unfolding Time

The bicycle will be tested for time of folding and

unfolding.

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V. RESULT AND DISCUSSION

24-volt 180-watt

DC electric motor

with rated speed

of 2500 rpm

1. Selecting appropriate electric motor for the

design

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2. Charging System

The team adapted the principle of

pedal powered generators that wield

an automobile alternator to produceelectricity.

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3. Motor and Alternator Installation

(wheel diameter motor rpm)

target speed

(wheel diameter, inches) x motor rpm

(target speed, mph) 336=

The resulting ratio will be 7.94 : 1

16 in x 2500 rpm

15 mph x 336

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3. Motor Installation

Velocity at the wheel:

motor rpm

44 (40)

13 (16)

Overall speed ratioSpeed at wheel

2500 rpm

wheel rpm

wheel rpm 295.45 rpm

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3. Motor Installation

Velocity at the wheel DN (16 in)(295.45 rpm)

14850.94 in/min

6.3 m/s or 22.6 kph

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3. Alternator Setup

The pedal crank arm has 44 teeth sprocket

and the rear wheel has 16 teeth sprocket.

If a standard cyclist can rotate the pedal at60 rpm (minimum), the rear wheel will

rotate at 165 rpm.

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3. Alternator Setup

alternator rpm

16 (1)

2(1)

Overall speed ratio

alternator rpm

165 rpm

alternator rpm 1320 rpm

wheel rpm

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4. Battery Wiring

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Basis of weight capacity:

Carbon Steel: Syt 26 kpsi

max 0.5 Syt/ N 0.5(26) / 3

max 4.333 kpsimax F / A

F 4333 lb/in2 (1/4)2 in24

F 212.7 lbs or 96.46 kg

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Basis of weight capacity:

Motor, Alternator and Battery weight 6 kg

Maximum Weight Capacity 90 kg

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Specification

Weight 23 kg

DC Motor 24V 180 Watts

Alternator 12V 1000 rpm

Wheel 16 in.

Carton SizeFolded 32 x 28 x 19 in.

Unfolded 36 x 45 x 19 in.

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V. RESULT AND DISCUSSIONTime Elapsed, secondsRange, meters Plain Road Rough Road

1 0.82 0.91

2 1.32 1.5

3 1.82 1.94

4 2.01 2.35

5 2.24 2.83

6 2.41 3.23

7 2.58 3.59

8 2.77 3.93

9 3.01 4.23

10 3.2 4.62

11 3.38 5

12 3.64 5.33

13 3.87 5.69

14 3.98 6.06

15 4.17 6.38

16 4.34 6.68

17 4.52 7.01

18 4.69 7.34

19 4.94 7.66

Top Speed

Top Speed

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AT PLAIN ROAD, THE TOP SPEED

WAS 3.85 M/S (13.86 KPH)

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Time Elapsed, seconds

Range, meters 63 kg 90 kg

1 0.93 2.73

2 1.58 3.78

3 1.9 4.17

4 2.52 4.81

5 2.95 5.28

6 3.44 5.86

7 3.98 6.25

8 4.34 6.66

9 4.83 7.06

10 5.16 7.6

11 5.55 8.13

12 5.88 8.62

13 6.17 9.12

14 6.53 9.51

15 6.92 10

16 7.28 10.44

17 7.63 10.8

18 7.97 11.54

19 8.31 11.99

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FOLDING/UNFOLDING TEST

Trial Fold Unfold

1 14 sec. 2 minutes

2 9 sec. 1 min. 8 sec.

3 11 sec. 1 min. 20 sec.

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CHARGING RATE

Trial Time, minutesInitial

Voltage

Additional

VoltageCharging Rate

1 10 8.52 0.37 0.037 volt/min

2 15 6.67 0.610.0407

volt/min

3 25 9.41 0.83

0.0332

volt/min

average charging was 0.037 volt/min (2.22 volt/hour)

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FINANCIAL COST

Material Quantity Cost

BI (Black Iron)

pipe3 ft

Php 719 BI pipe 7 ft

1 BI pipe 5 ft

1 BI pipe 1 ft

2 Flat Bar Php 195

Total Cost: Php 914

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Parts Quantity Cost

16 wheel set 2 Php 680

16 teeth sprocket 1 50

Head Set 1 50

Handle Post 1 100

Pedal Alloy Set 1 240

9/16 fittings 1 135

Seat Clamp 3 360

Front Fork (#16) 1 160

Pedal Crank Set 1 185

Nuts 10 50

Chain 1 85

Brake 1 150

Switch 3 75

12V Alternator 1 900

Battery 2 780

Wirings 4 meters 150

Skiwer 2 120

Handle grip 2 60

Motor 1 1000Total Cost: Ph 5330

Total Cost of Project Php 6,244

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VI. CONCLUSION

The device is more efficient in plain road but it can

traverse a rough road despite of low velocity.

Compared with existing folding electric bikes, the

initial cost of the project was cheaper.

The charging rate of the device was 2.22 volt/hr

which is good enough to be said as an effective charge rate.

The folding and unfolding time of the bicycle tooklonger than the other folding bicycle.

VII RECOMMENDATION

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VII.RECOMMENDATION

The proponents recommend using electric motorwith higher output motor or connecting the motor with a

capacitor.

The battery capacity should equalize the current that

the motor needs so it can last longer.

Three-wheel (Trike, with two rear wheels parallel to

each other) design concept of body may be effective for

motor, charging device, and battery installation.

Other motors that can be used as generators can besubstitute for alternator if they can charge faster.

Wirings should be kept hidden so that there are no

obstructions when riding.

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END . . .

Marvin Rhey D. Quitoras

Jonathan G. Vitug

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