System for on-board weighing on maintenance trucks 2016 - - PowerPoint PPT Presentation

System for on-board weighing on maintenance trucks

2016 International Conference on Winter Maintenance and Surface Transportation Weather

Torgeir Vaa, Norwegian Public Roads Administration Dagfin Gryteselv, Norwegian Public Roads Administration

08/03/2016

Learning outcomes

• There is a need for improvement in the reported

quantities of salt and sand used in winter operations

• The study show how a weighing system based on load

cells can be used for dynamic quantity control

• The weighing system can be factory fitted or

retrofitted

• The accuracy of the weighing system is better than 5%

compared with actual weight controlled on an external weight

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Background

• It is proven large deviation in the quantity of salt

and sand when comparing data from automatic data collection systems (AD) and manual statements from contractors

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Example: ploughing kilometers

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2000 4000 6000 8000 10000 12000 Oct Nov Dec Jan Feb March

Ploughing km Tomra C ra Contrac ractor r - plo loughing k km, 2009/ 2009/2010 10 AVL Manually

Example: amount of salt

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10 20 30 40 50 60 70 80 90 100 Oct Nov Dec Jan Feb March

Tons sal s salt Tomra C ra Contrac ractor r - amount o

• f salt

lt, 2009/ 2009/201 010 AVL Manually

Example: amount of sand

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100 200 300 400 500 600 700 800 900 Oct Nov Dec Jan Feb March

Tons san s sand Tomra C ra Contrac ractor r - amount o

• f sand, 2009/

2009/20 2010 AVL Manually

Background

Unsatisfactory quantity control can have as consequences:

• Measures are not executed according to the

standard requirements

• Systematic errors means that one party loses

money

• Poor confidence in AD systems enables

transition to billing by electronic quantity tasks takes a long time

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Background

Consequences of improper calibration and other deviations:

• “Wrong" actions are carried out? Too little / too

much grit agent?

• Cannot rely on the statistics: Where and how

much grit agent is laid out?

• Cumbersome routines for settlement of

quantities of salt and sand since the normal practice is that the contractors note manual statements

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Pilot project – the two first trucks

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Syste tem f for

• r on
• n-bo

board w d weighin ing

Sh Shor

• rt his

istory:

• Winter season

2010/2011: Started with two trucks: «Lesja truck», Mesta and «Tomra truck», Kolo Veidekke

• 4 load cells and riser

pipe for measuring amount of liquid in the tanks

• Plan strapped and

traditional strapping

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Syste tem f for

• r on
• n-board

rd weighi hing ng

Sh Shor

• rt his

istory: Conclusions from the first trials:

• Promising test results
• Necessary to co-operate

with spreader manufacturers/suppliers

• Improve the attachment

solution

• Include more trucks in

the pilot

• Look at the possibility for

self calibration

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System for on-board weighing

Projec ect p t phases es:

2011/2012

• Invited to co-operation with spreader

manufacturers/suppliers – two companies responded positively 2012/2013

• The pilot project was extended with trucks with factory

fitted weighing system 2013/2015

• Extension of the pilot project including more contract

areas

• Further development and testing with focus on

accuracy Autumn 2015

• Requirements for weighing system in one contract area in

each of the five regions

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On board weighing

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Load cells, hook lift spreader

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Pressure sensor for measurement of liquid level and signal amplifier/load transmitter

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Weighing the material on the conveyor belt

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On board weighing – control weighing

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Difference between load cells and weight station: < 2%

Comparison – spreader data and data from weighing system – coinciding curves

Correct calibration and homogenous material

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Comparison – spreader data and data from weighing system – diverging curves

Calibration of spreader is deficient?

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Test Åndalsnes 4. March 2015

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Vei eies esystem emtes ester er, Åndalsnes es, 4/3-2015 Dato 04.03.2015 Veiing av bil på vekt Spreder Materiale Strekning [km] Sand/ Salt Væske Sum Sum utlagt [kg] Sand/ Salt Væske Sum Kg % Kg % Kg % Falköping, Dombås Tørr sand 11,8 7187 0 7187 8105 8232

• 257

7975

• 127
• 1,6
• 257

N/A 130 130 1, 1,6 Falköping, Dombås Fastsand 13,3 7797 1621 9418 9005 8065 735 8800 N/A N/A N/A N/A 205 205 2, 2,3 Falköping, Romsdal Salt, tørt 34,5 2069 0 2069 2105 2075 2075 30 1,4 N/A 30 30 1, 1,4 Falköping, Romsdal Salt, tørt 34,5 2066 0 2066 2145 2125 2125 20 0,9 N/A 20 20 0, 0,9 Falköping, Romsdal Salt, befuktet 24,2 1078 324 1402 1125 852 298 1150 N/A N/A N/A N/A

• 25

25

• 2,

2,2 Epoke, Vestnes Salt, tørt 34,3 2083 0 2083 2285 2174 2174 111 4,9 N/A 111 111 4, 4,9 Epoke, Vestnes Salt, tørt 34,3 2084 0 2084 2185 2101 2101 84 3,8 N/A 84 84 3, 3,8 Epoke, Vestnes Salt, tørt 34,3 2067 0 2067 2334 2323 2323 11 0,5 N/A 11 11 0, 0,5 DIFFERA RANSE - GJ.SNITT: TT: 1, 1,6 N/A: Ikke tigjengelig Sum Tørr rrstoff

• g Væske

U T T L A G T T E M E E N G D E E R Differ eranse e Vei eiing av bil og Vei eies esystem em (Dat ata a fra a Loggfiler/Epo poTrac ack) Væske Avlest fra sprederpanel [kg] Fra veiesystem, Loggfiler/EpoTrack [kg] Tørrstoff (Sand/Salt)

Test Åndalsnes 4. March 2015

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1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 Truck 1, sand Truck 2, sand Truck 3, salt Truck 4, salt Truck 4, salt Truck 5, salt Truck 5, salt Truck 5, salt Kg Control panel Load cell External wieght

Test Åndalsnes 4. March 2015

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• 25.0
• 20.0
• 15.0
• 10.0
• 5.0

0.0 5.0 10.0 15.0 Truck 1, sand Truck 2, sand Truck 3, salt Truck 4, salt Truck 4, salt Truck 5, salt Truck 5, salt Truck 5, salt Error in % Te Test 4.

• 4. March 2015

2015 External weight - control panel External weight - load cell

Is the spreader market prepared?

• Epoke - been a partner in the pilot project –

weighing the conveyor belt

• Falköping - been a partner in the pilot project

– offers a solution based on load cells

• Aebi-Schmidt – offers a solution based on

load cells

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Requirement in contracts starting September 2016

• Requirements for weighing system in one contract

area in each of the five regions in Norway

• Spreaders for salt/sand shall have equipment to

register the amount of dry material and liquid during spreader actions

• Accuracy within ± 5 %
• Self calibration function – automatic adjustment of

the spreader as a minimum per ton or per m3

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Demonstration project

Starting point:

• New system, functions and procedures may have

some challenges

• Need for closer support and control during the

first years

• It will take some time to establish new procedures

and routines

• And the system is still under development

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Microcontroller replaces PLS

• PLS
• Open source microcontroller
• Smart phone
• Cable or Bluetooth shield
• More flexible and cheaper

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Learning outcomes

• There is a need for improvement in the reported

quantities of salt and sand used in winter operations

• The study show how a weighing system based on load

cells can be used for dynamic quantity control

• The weighing system can be factory fitted or

retrofitted

• The accuracy of the weighing system is better than 5%

compared with actual weight controlled on an external weight

• Contact information: torgeir.vaa@vegvesen.no

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