Rapid Oil Consumption Measurement

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					                                           Rapid Oil Consumption
                                                    Measurement
             Industriegebiet Ost
                  Am Hölzel 11
               D-76829 Landau
                       Germany
              '+49.6341.991.0
             www.apl-landau.de
                                                A new instrument for optimisation of lube oil
                                            formulation and reduction of oil related emissions




3rd International Conference
LUBRICANTS RUSSIA
      - 2007 -




                                   APL AUTOMOBIL – PRÜFTECHNIK LANDAU GMBH
                  Oil Consumption – Oil Emission

                                                            oil sump balance


                                                  oil consumption

                               oil emission                                                                           crack products
                                                                                                                            &
                                                                                                                           PM


                          unburnt HCs
                          from lubeoil

                       lubeoil in exhaust gas




                                                                                                                                                             combustion deposits, water
                                                    reverse bBlow-by
evaporation




                                                                                                                                                                                          fuel
                                                                                                                             deposits in engine
                        scraping


                                   flinging off




                                                                                 valve lubrication
                                                                       Blow-by




                                                                                                                                                  leakages
                                                                                                     lubrication TC
              lubrication piston-
              piston ring-cylinder

                   oil sump volume = lubeoil + fuel + water + ...                                                                                                                                fresh oil
                                                      Mechanism Evaporation
                                                         Temperatures 0 - 720° Crank Angle



                                                    combustion chamber above piston
evaporation




                                                                                                        Log (T)
              piston




                         top ring




                       2nd ring




                                  oilfilm
                                     liner                   oil evaporation    oilfilm cooling water
                                            water                              cylinder liner
              Oil Consumption Measurement
                                                 Methods


    without tracer
groups of HC- molecules,
unchanged fuels + lubes
 selective ion calculation
     in mass spectra




      with tracer
radioactive         not             conventional
                radioactive
                              gravimetric      volumetric
 Tritium           SO2
  Brom            Chlor
                  Pyren       drain / weigh      level
                                method        measurement
Composition of Fuels & Lubes

 Hydrocarbons



                          carbon
                          hydrogen




                overlap



  distance
                                                                          Measuring Method
                                                                        Mass Segments for Oil Emission

                     ring-shaped hydrocarbons
                                                     xylene
                          benzene
                                         toluene
ambient air
substances                                                                aliphatic hydrocarbons
              CO2
     Ar
               O2
       N2
              H 2O
                         Intensity




                                                   Gasoline < 160 m/z       Oil emission measuring range > 170 m/z



                                                               Diesel fuel < 290 m/z                   Oemr > 300 m/z




                                     0        50       100        150        200           250       300     350
                                                                             [Atomic mass units]
                                                                                                 Mass(m) / Charge(z)
                            Rapid Oil Emission Measurement
                                                                                             Principle

                                       sampling in exhaust system



                                    vacuum                          ion source
                                    pump
                                                                                 hexapol

                                                                                           quadrupoles


                                       pre vacuum
Frequency < 250 Hz



                            mass
                                                high vacuum
                     spectrometer




                       detector
                  Stationary Comparison of Oils
                       Oil related oil consumption differences




4-cyl 2 litres
gasoline engine

•measurement
•flushing
•measurement
•flushing
•measurement
•flushing
                                          Comparison of Oils over Time



                                    running in     increasing level

                      delta fresh


combination of
online methods:




                                                                       delta eot
•rapid oil emission
•radio nuclid wear

+ simulation
+ calculation

                                    running in    constant low level
        Comparison of Oil Emission Maps
          OIL A             OIL B
20 h
300 h
Comparison of Oil Emission Maps vs Time
                                                          Influence of Motoring / Intake Vacuum
                                                                                              Dynamic Behaviour


                                                100

                                                90                        modified by
                                                                           motoring
                                                80

                                                70
                           oil emission [g/h]




                                                60

                                                50

                                                40

                                                30

                                                20
fired:   20Nm load
motored: throttle closed                        10

                                                 0
                                                      0      100   200   300          400   500    600     700
                                                                               time [s]
                  Dynamic Comparison of Oils
                                    Test Cycle




4-cyl 2 litres
gasoline engine
                        Dynamic Comparison of Oils C, D & E
                                                              Test Results




4-cyl 2 litres
gasoline engine




WOT oil consumptions
    D<E<C



peak oil consumptions
     D<C<E




                                           Peak oil consumption up to 500 g/h
                  Summary & Conclusions
§ A new rapid oil consumption measurement
  technique allows measurements up to 250 Hz
§ This enables the "fine tuning" of lube oils like
  no other method
§ For some OEMs the traditional oil quality
  specifications, together with their on top in-
  house requirements are no longer sufficient
§ Oil quality and formulation modifications can
  quickly be compared without influence of
  changes in the engine
§ In combination with online wear measurement
  this is the quickest development tool for the
  moment
§ Simulation techniques and calculations can
  additionally support the lube oil development

				
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posted:6/24/2013
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