Exhaust Gas Purification System PM Accumulation Prediction
Solution Overview
Problem
The existing exhaust gas purification systems face inconvenience due to increased frequency of DPF regeneration requests during Long Low Idle Regeneration (LLIR), as they incorrectly calculate PM accumulation based on stopped/idling time, including short stops at traffic lights, leading to unnecessary regeneration requests.
Innovation Solution
An exhaust gas purification system with a control unit that predicts PM accumulation and initiates regeneration only after a predetermined time has elapsed since the vehicle has been idling, avoiding short stops and ensuring regeneration occurs only when the vehicle is idling for an extended period, thereby reducing unnecessary regeneration requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system calculates PM accumulation based on cumulative idling time, then the regeneration request is issued more frequently to ensure thorough purification, but this increases inconvenience during temporary stops at traffic lights
Solution Approach 1:
The system performs preliminary classification of idling states by detecting whether the vehicle is in motion or stopped before calculating PM accumulation. This preliminary action prevents temporary stops from being incorrectly counted toward regeneration thresholds, resolving the contradiction between reliable PM purification and driver convenience during traffic lights.
2Manufacturing precision
If the system issues regeneration requests during every idling event, then PM accumulation is controlled more strictly, but the frequency of regeneration requests increases unnecessarily during short stops
Solution Approach 1:
The system performs preliminary detection of vehicle motion state before initiating PM accumulation calculation. This preliminary action ensures that only meaningful idling events (when vehicle is stopped) are counted, preventing unnecessary regeneration requests during temporary stops and reducing time loss while maintaining precise PM accumulation control.
3Reliability
If the system counts all stopped time toward PM accumulation, then regeneration is ensured even during brief stops, but the regeneration threshold is reached too quickly due to traffic light stops
Solution Approach 1:
The system performs preliminary classification of idling events by detecting vehicle motion state before counting toward PM accumulation. This preliminary action distinguishes between meaningful idling (vehicle stopped) and temporary stops (traffic lights), ensuring regeneration is assured during actual idling while preventing productivity loss from premature regeneration requests during traffic lights.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the frequency of DPF regeneration requests during LLIR, enhancing user convenience by accurately accounting for idling time and preventing premature regeneration, thus maintaining system efficiency and reducing driver intervention.
Implementation Method 1
oxidizing (combusting) the supplied unburned fuel by the DOC
Implementation Method 2
trapping the PM contained in exhaust gas from a diesel engine by a DPF (Diesel Particulate Filter)
Implementation Method 3
combusting and removing the PM trapped in the DPF
Data Source
AI summary
An exhaust gas purification system with which a frequency of diesel particulate filter (“DPF”) regeneration requests can be reduced during long low idle regeneration, thereby improving convenience, including a control unit that performs regeneration control on a DPF provided at an exhaust pipe of an engine. The control unit includes a particulate matter (“PM”) accumulation amount predictor for predicting the amount of PM accumulated by calculating a cumulated value of the PM in an idling state. The control unit starts calculating the cumulated value of the PM by the PM accumulation amount predictor after a first predetermined time has elapsed since a detection of the idling state.