Added Euro 6, now covering all model generations; improved result plots
Link to post: “Fuel Level”
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Added Euro 6, now covering all model generations; improved result plots
Link to post: “Fuel Level”
Posted in Uncategorized
Car: 2009 Impreza 2.0 Turbo Diesel, 110 kW / 148 hp / 150 PS, European domestic market, Euro 4 spec.
Important: Newer Boxer Diesel generations (Euro 5/6) may show different behaviour!
ECU firmware: patched ROM for unlimited logging, otherwise stock.
Protocol: SSM2 via CAN
More than 120 items had been logged, plenty of RAM variables (*) plus standard SSM2 items at roughly 170 ms interval.
I prepared two graph images plotting some interesting parameters, click picture for full resolution:
… at specific time positions:
Time @ ~ 33 ½ min
Cruise Control: active
Vehicle Speed*: 110 km/h
Engine Speed: 2300 rpm
Gear: 5
Coolant Temperature: 93 °C
Injections: 2 (pre + main)
Soot Accumulation Ratio: 64 %
DPF Pressure Difference: ~ 5 kPa
Exhaust Gas Temperature (EGT) Catalyst Inlet: 345 °C
EGT DPF Inlet: 370 °C
Intake Air Amount: 430 mg/cyl
Mass Air Flow: 33.8 g/s
Manifold Absolute Pressure (MAP)*: 126 kPa
Inlet Air Temperature: 25 °C
Manifold Air Temperature: 48 °C
Fuel Temperature: 58 °C
Throttle Opening Angle: 79 deg
EGR Valve Opening Angle: 38 deg
Final Oil Dilution Rate*: -1.9 mg/s (evaporation)
Oil Dilution Amount: 282.0 g (4.6 %)
@ 33 ¾ min
Soot Accumulation Ratio* reaches 65%, this triggers active regeneration preparations. Note: I am referring to the actual RAM value, diagnostic parameter may indicate 65% earlier due to rounding.
Apparently ECU now does 3 injections (pre + main + after) when power demand is high enough, no post injections yet
@ 34:04; = 20 seconds after #2, DPF Regeneration Switch turns ON
EGR valve closes instantly, 0 deg
Manifold Air Temperature dropping
Boost Control opens VGT immediately, from 52 to 25%
Manifold Absolute Pressure* dropping
pilot-injection kicks in, 2 injections (pilot C + main)
post-injections begin to fade in but not active yet
@ 33 seconds after #2, post-injections A + B become operational (injection amount > 0)
oil dilution rising
EGTs climbing
Manifold Absolute Pressure*: 75 kPa (~ 25 below ambient), varying, stays below ambient most of the time during regen at low power demand
EGT Catalyst Inlet: 340 °C
EGT DPF Inlet: 320 °C
injections: 4 (pilot C + main + post A + post B)
Example @ 35:12
EGR valve opens instantaneously, 70 deg; EGR behaves rather digitally during regen – either fully closed (0 deg, for max EGT) or max opened (70 deg, less fresh air)
Throttle Opening Angle: rising up to 31 deg
injections: 0
Fuel Consumption*: 0 mm³/s
oil dilution going down slowly due to estimated evaporation
EGT Catalyst Inlet: decreases fast, EGT at DPF inlet (> 600 °C) follows with a delay
Engine Speed: gear change from 5th to 6th to reduce engine braking effect
@ 45:30
Engine Speed: 800 rpm
Post A Injection Amount*: 0
Post B Injection Amount*: ~ 8 mm³/st
Apparently while idling the ECU prefers the 2nd post-injection (“B”), otherwise during driving it’s rather mixed
Final Oil Dilution Rate: ~ 20 mg/s (medium)
Boost Control: 25 % (VGT fully open)
Manifold Absolute Pressure*: 74 kPa
Throttle Opening Angle: 5.5 deg
EGR Valve Opening Angle: 0 deg
Intake Air Amount: 370 mg/cyl
Mass Air Flow: 9.8 g/s
@ 46:15, decision is based on elapsed time from #2, achieved soot level does not matter (!)
DPF Regeneration SW had been ON for 12.2 minutes
all post-injections off
Oil Dilution Amount*: 299.6 g (4.9 %) = + 0.3 % during regeneration
EGR back to normal operation
Boost Control: 65 % instantly (max speed, spooling up turbo)
MAP rising
EGT Catalyst Inlet: 270 °C
EGT DPF Inlet: 490 °C
Perhaps another color map for EcuFlash might be interesting? I wrote a little SageMath python script to generate a ScoobyRom-like color map file.
Note: Although generated color map matches ScoobyRom’s precisely, EcuFlash applies colors based on “min
” and “max
” specified in XML definitions.
Excerpt from EcuFlash definition file: 32BITDIESELBASE.xml
<scaling name="ChargeAirPressure" units="kPa" toexpr="x" frexpr="x" format="%.0f" min="0" max="255" inc="1" storagetype="uint8" endian="big"/>
Whereas ScoobyRom scales colors ranging from a map’s actually used mininum and maximum. For example, if you would change min="0"
to min="100"
in above scaling definition, low value colors would appear bluish like in ScoobyRom, effectively making map graphics cover more/most of available color range.
1) Download file scoobyrom-map.odt
2) Rename downloaded file to ScoobyRom.map
, since normal file extension is not allowed on wordpress.com.
3) Move file into EcuFlash’s color maps folder, i.e.
C:\Program Files (x86)\OpenECU\EcuFlash\colormaps\
4) Launch or restart EcuFlash.
5) Via EcuFlash menu: File → Options → Appearance → Default Color Map
Select “ScoobyRom.map”
(Btw., default color map directory can also be defined in Options)
Color map format is plain text ASCII file, usually 256 lines as in this case, specifying RGB values which will be applied to maps, from low to high:
153 153 255 153 154 255 153 156 255 152 157 255 ... 255 110 103 255 107 102 255 105 102 255 102 102
Posted in ECU Analysis, EcuFlash, Graph, Software
Project homepage: ScoobyRom Software
Already implemented in previous version is the ability to parse and display ROM Date (year-month-day), diesel as well as petrol type encodings. May not work for all ROM types (yet), though. AFAIK, ScoobyRom is the only software parsing this Denso specific date.
ScoobyRom 0.8.2 – Properties window, CID JZ4A211B
Due to my intense work on BMW ECUs in recent years, I got familiar with TunerPro which is a generic ROM editor. It is quite popular in the BMW community, it can handle lots of data format options. Its definition format “XDF” is XML-based as usual. As an exercise to verify XDF knowledge I implemented XDF output in ScoobyRom.
Compared to RomRaider, reading an XDF containing hundreds of tables is very fast, almost instant. TunerPro is Windows-only and closed-source however.