DPF analysis

Engine exhaust system

DPF is a compulsory part of every Euro 6/BS 6 diesel engine

P

DPF regeneration/soot oxidation/soot burn:

Passive Regeneration: Soot is burned off from the DPF without ECU intervention, typically occurring at higher engine loads.

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Active Regeneration: When the ECU actively increases exhaust temperature (500-650°C) to burn off soot. Regeneration is initiated either DP based, Soot Load Based or periodic based on OEMs.

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Parked Regeneration: Drivers can initiate parked regeneration by parking the vehicle and engaging a switch,

causing the engine to rev up and increase exhaust temperature to burn off soot.

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Forced Regeneration: Technicians at a shop can perform forced regeneration by connecting to the vehicle via a laptop/diagnostic tool.

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*https://dieselnet.com/tech/dpf_regen.php

Broad claims:

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A regeneration quantification method for a diesel particulate filter which traps particulate (soot) contained in engine exhaust gas, comprising:

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• An approach which detects the regeneration events based on differential pressure across DPF, rise in temperature of the exhaust gas and exhaust gas flow rate.

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• Quantifying the quality of regeneration based on the post regeneration pressure drop

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• Forecast a clogged DPF alarm much before the actual DTC event based on quality of regeneration over multiple time points

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• Analysis of the overall fuel-efficiency of operating the vehicle based on effectiveness of regeneration events

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• Warning alerts and recommended remedial actions are conveyed or displayed to users.

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Algorithm flowchart:

Extract PIDs from OBD packets and data curation

Are RPM & throttle & engine load values optimal for differential pressure measurement?

Log the differential pressure, DPF in temperature and Exhaust gas flow rate

Regeneration condition are met?

Quantify the soot burn quality and milage drop while regeneration

Raise alert based on soot burn quality and milage drop

Drop the data

Indicate good health

Accumulate the differential pressure over time

Estimate remaining useful life of DPF

No

No

Yes

Yes

Quantifying soot burning quality:

Mapping fuel efficiency (cost) to DPF clogging:

Milage (kmpl)

+ - Good state milage

x – Bad state milage

Estimating DPF life:

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1.95 kPa

2.18 kPa

User interface:

Alert details:

History information: