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 08/03/2016

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 08/03/2016

Example: ploughing kilometers Tomra C ra Contrac ractor r - plo loughing k km, 2009/ 2009/2010 10 12000 10000 8000 Ploughing km AVL 6000 Manually 4000 2000 0 Oct Nov Dec Jan Feb March 08/03/2016

Example: amount of salt Tomra C ra Contrac ractor r - amount o of salt lt, 2009/ 2009/201 010 100 90 80 70 60 s salt Tons sal AVL 50 Manually 40 30 20 10 0 Oct Nov Dec Jan Feb March 08/03/2016

Example: amount of sand Tomra C ra Contrac ractor r - amount o of sand, 2009/ 2009/20 2010 900 800 700 600 s sand 500 Tons san AVL 400 Manually 300 200 100 0 Oct Nov Dec Jan Feb March 08/03/2016

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 08/03/2016

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 08/03/2016

Pilot project – the two first trucks 08/03/2016

Syste tem f for or on on-bo board w d weighin ing Sh Shor ort 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 08/03/2016

Syste tem f for or on on-board rd weighi hing ng Sh Shor ort 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 08/03/2016

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 08/03/2016

On board weighing 08/03/2016

Load cells, hook lift spreader 08/03/2016

Pressure sensor for measurement of liquid level and signal amplifier/load transmitter 08/03/2016

Weighing the material on the conveyor belt 08/03/2016

On board weighing – control weighing Difference between load cells and weight station: < 2% 08/03/2016

Comparison – spreader data and data from weighing system – coinciding curves Correct calibration and homogenous material 08/03/2016

Comparison – spreader data and data from weighing system – diverging curves Calibration of spreader is deficient? 08/03/2016

Test Åndalsnes 4. March 2015 Vei eies esystem emtes ester er, Åndalsnes es, 4/3-2015 Differ eranse e Vei eiing av bil og Vei eies esystem em Dato 04.03.2015 U T T L A G T T E M E E N G D E E R (Dat ata a fra a Loggfiler/Epo poTrac ack) Fra veiesystem, Avlest fra Veiing av Tørrstoff Sum Tørr rrstoff Loggfiler/EpoTrack Væske sprederpanel [kg] bil på vekt (Sand/Salt) og Væske [kg] Strekning Sand/ Sum utlagt Sand/ Spreder Materiale [km] Salt Væske Sum [kg] Salt Væske Sum Kg % Kg % Kg % Falköping, Tørr sand 11,8 7187 0 7187 8105 8232 -257 7975 -127 -1,6 -257 N/A 130 130 1, 1,6 Dombås Falköping, Fastsand 13,3 7797 1621 9418 9005 8065 735 8800 N/A N/A N/A N/A 205 205 2,3 2, Dombås Falköping, Salt, tørt 34,5 2069 0 2069 2105 2075 0 2075 30 1,4 0 N/A 30 30 1, 1,4 Romsdal Falköping, Salt, tørt 34,5 2066 0 2066 2145 2125 0 2125 20 0,9 0 N/A 20 20 0, 0,9 Romsdal Falköping, Salt, 24,2 1078 324 1402 1125 852 298 1150 N/A N/A N/A N/A -25 25 -2, 2,2 Romsdal befuktet 0 Epoke, Salt, tørt 34,3 2083 0 2083 2285 2174 0 2174 111 4,9 0 N/A 111 111 4, 4,9 Vestnes Epoke, Salt, tørt 34,3 2084 0 2084 2185 2101 0 2101 84 3,8 0 N/A 84 84 3, 3,8 Vestnes Epoke, Salt, tørt 34,3 2067 0 2067 2334 2323 0 2323 11 0,5 0 N/A 11 11 0, 0,5 Vestnes DIFFERA RANSE - GJ.SNITT: TT: 1, 1,6 N/A: Ikke tigjengelig 08/03/2016

Test Åndalsnes 4. March 2015 10000 9000 8000 7000 6000 Kg 5000 4000 3000 2000 1000 0 Truck 1, Truck 2, Truck 3, Truck 4, Truck 4, Truck 5, Truck 5, Truck 5, sand sand salt salt salt salt salt salt Control panel Load cell External wieght 08/03/2016

Test Åndalsnes 4. March 2015 Test 4. Te 4. March 2015 2015 15.0 10.0 5.0 0.0 Error in % Truck 1, Truck 2, Truck 3, Truck 4, Truck 4, Truck 5, Truck 5, Truck 5, -5.0 sand sand salt salt salt salt salt salt -10.0 -15.0 -20.0 -25.0 External weight - control panel External weight - load cell 08/03/2016

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 08/03/2016

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 08/03/2016

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 08/03/2016

Microcontroller replaces PLS • PLS • Open source microcontroller • Smart phone • Cable or Bluetooth shield • More flexible and cheaper 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 • Contact information: torgeir.vaa@vegvesen.no 08/03/2016