Design of An Intelligent Washing Machine X-007 - CS: Systems Engineering Course DIAT - Pune

Systems Engineering Course
DIAT Pune
March 03 07, 2014
Design of an
Intelligent Washing Machine
X-007 CS
Scenarios
Working Woman:
Not possible to given continuous attention
Expect the machine to complete the cleaning, drying and folding
Mix of clothes to be automatically handled by the machine.
Farmer:
Water scarcity 8-10ltrs of hard water
Heavily soiled clothes of 4 people
Power cuts and voltage fluctuations
Easy to use
Scenario -cont.
Small house:
Less space to locate the machine wall mount is preferable
Should be silent
Quick wash option for daily used clothes

Maintenance scenario:
Level1: Should display the cause and instructions to the user
Level2: When the fault requires spares or specialized attention, should
automatically communicate to the service center by SMS or over
Internet. Service center should identify the spares required, and
schedule a service call with the customer.
Need Statement
Able to handle mixed clothes
Quick wash
Least human intervention
High Quality of wash
Fully Dry
Low Water Consumption
Tolerance to power quality and cuts
Small Size
Silent operation
Fault localization and instructions
Nominal Group Technique Matrix

Yati Mano Srik Sort Sar Ravi Rame AVG STD
Customer Needs/Weightage 1 1 1 1 1 1 1

Scene-1
14 5 2 7 2 15 2
7 6
Scene-2
3 10 12 14 15 5 10
10 4
Scene-3
5 5 12 7 5 0 5
6 4
Able to handle mixed clothes
9 5 6 13 15 0 15
9 6
Quick wash
4 10 2 7 5 0 10
5 4
Least human intervention
8 5 12 7 10 10 5
8 3
High Quality of wash
10 15 20 13 20 15 20
16 4
Fully Dry
10 10 6 7 5 5 5
7 2
Low Water Consumption
13 5 4 3 7 20 5
8 6
Tolerance to power quality and cuts
12 0 2 9 7 10 3
6 5
Small Size
5 10 2 3 5 5 5
5 3
Silent operation
3 10 10 3 2 5 5 5 3
Fault localization and instructions
4 10 10 7 2 10 10 8 3
100 100 100 100 100 100 100 100
House of Quality Matrix

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Improvement Direction
Unit Num Deg % Ltr V Watts Cum Db g rms % min min
Able to handle mixed clothes 9 u
Quick wash 5
Least human intervention 8
High Quality of wash 16 u
Fully Dry 7 u
Low Water Consumption 8 u u
Tolerance to power quality and cuts 6
Small Size 5 u
Silent operation 5
Fault localization and instructions 8
Relative Importance 18 15 8 8 3 8 5 4 4 5 12 10
Morphologic Table
Loading of
Clothes
Manual
(5,5)
Suction
(5,3)
Conveyer
(5,2)
Hopper
(5,5)
Robotic
(5,4)
Loading of
Cleaning agent
Multiple
Compartme
nt (5,4)
Single
Compartme
nt (4,5)
Automated
Dispenser
(5,3)
Spraying (2,3) Manual
(5,5)
Mixing of
clothes and
cleaning agent
Soaking
(3,5)
Centrifugal
(5,5)
Vibration
(3,4)
Conveyer
(5,1)
Cleaning cycle Air jets &
Ultrasonic
(5,2)
Centrifugal
(5,5)
Tumble (5,5) Agitated (5,5) Vacuum
(4,1)
Scrubbing
(5,1)
Remove the
cleaning agents
and dirt
Squeeze
(3,3)
Air Blower
(2,4)
Suction (5,4) Centrifugal
(5,5)
Chemical
Agents (5,1)
Remove the
clothes
Manual
(5,5)
Suction (4,2) Robotic Arm
(5,1)
Conveyer
(5,1)
Update user Buzz (5,5) Digital
Display (5, 5)
Speak (5,3) Flash SMS
(5,2)
Web
connection
(5,3)
Conservative
Advanced
Radical
Pugh Table
Criterion Weight Conservative Advanced Radical
Safety Criterion Go/NoGo GO GO GO
R&D Cost 9 5 -5 -5
Segregation 16 0 5 5
Level of Automation 14 -5 5 5
Dryness 7 0 5 5
Water Qty / cycle 7 0 5 -5
Vg range 3 0 0 5
Power Consumption 7 0 -5 -5
Size 5 0 -5 -5
Noise 4 5 0 0
Vibration 4 5 5 5
Health monitoring 5 -5 5 5
Time-Min 11 -5 5 5
Time-Max 9 -5 0 5
Weighted Design Rating -110 170 90
Maintenance Scenario
Minor
(O-Level)
Intermediate /
Major
Display
info and
instruction
User
Repairs or
S/C Helps
Display
info and
Msg to S/C
S/C Instructs the
user on
maintenance
OR
Schedules a call
along with spares
Msg to
Service
Center
Service
Center
Followup
Critical Issues
Cleaning the cloths with Mixed fabrics
Communicating to user
Wash Cycle time
Power
Water Quantity
Noise
Safety
Chosen Design
Function Method Remarks
Loading of Clothes
Conveyer Enables detecting the type of clothes.
Enables determining the wash cycle
Loading of Cleaning
agent
Automated Dispenser Provides for selecting the type of
cleaning agent and quantity based on
clothes type and wash cycle
Mixing of clothes and
cleaning agent
Conveyer Cleaning agents are sprayed over the
clothes to remove stains and uniform
spread of cleaning agent
Cleaning cycle
Air Jets and Ultrasonic,
Vacuum suction
Ultrasonic vibration separates dirt, air
jets wash off the dirt and removed by
suction
Remove the cleaning
agents and dirt
Chemical Neutralizers Remove cleaning agents without water
Remove the clothes
Conveyer Clothes are removed, and fall back into
a container
Update
user/Maintenance
Web / Display Awareness through remote messaging.
Automated Service support.

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