Diesel Particulate Filter Automatic Regeneration Control
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Solution Overview
Problem
In diesel particulate filter (DPF) systems, manual regeneration during long low idle regeneration (LLIR) may cause PM accumulation when the vehicle is moved, leading to DPF clogging and convenience issues, especially for vehicles that travel short distances and frequently idle.
Innovation Solution
A DPF system with an accumulated PM quantity estimation means and a long low idle forced regeneration unit that automatically performs regeneration when the PM quantity exceeds a threshold, allowing transition to automatic regeneration if conditions are met, and urges manual regeneration if not, ensuring continuous regeneration and reduced clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual regeneration is performed during long low idle regeneration (LLIR), then PM accumulation is prevented, but vehicle movement causes regeneration interruption and DPF clogging
Solution Approach 1:
The system dynamically switches between manual regeneration mode (vehicle stopped) and automatic regeneration mode (vehicle moving). The control unit detects vehicle movement status and automatically transitions the regeneration process, making the system adaptable to changing operational conditions rather than requiring a fixed manual process
Solution Approach 2:
The control unit automatically detects vehicle movement and initiates the switch to automatic regeneration without requiring driver intervention. The system serves itself by monitoring its own operational state and making necessary adjustments to maintain regeneration effectiveness
2Reliability
If post-injection quantity is increased to raise exhaust gas temperature, then DPF regeneration is ensured, but fuel dilution in engine oil increases
Solution Approach 1:
The system changes the regeneration mode parameter based on vehicle operation conditions. During LLIR when the vehicle is stopped, manual regeneration with controlled post-injection is used. When the vehicle moves, automatic regeneration is activated, which adjusts the regeneration parameters to account for changing exhaust gas temperature and flow conditions, thereby optimizing the balance between regeneration effectiveness and fuel dilution
Solution Approach 2:
The post-injection quantity is dynamically adjusted based on the regeneration mode and vehicle operation state. The control unit modulates the injection timing and quantity to match the current operational conditions, preventing excessive fuel dilution while ensuring adequate temperature rise for PM oxidation
3Ease of operation
If vehicle moves during manual regeneration, then convenience is improved, but regeneration is interrupted and PM accumulates
Solution Approach 1:
The system is designed to be dynamic rather than static. Instead of requiring the vehicle to remain stationary throughout regeneration, the control unit continuously monitors vehicle movement and adapts the regeneration process accordingly, switching between manual and automatic modes to maintain regeneration continuity while allowing vehicle mobility
Solution Approach 2:
The control unit is prepared in advance to handle vehicle movement during regeneration. By pre-programming the automatic regeneration function and vehicle movement detection capability, the system can immediately respond to driver actions without interruption, ensuring seamless transition between operation modes
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 solution prevents DPF clogging and enhances convenience by allowing automatic regeneration during vehicle movement and reducing the need to wait for manual regeneration completion, particularly benefiting vehicles that frequently idle, such as fire trucks.
Implementation Method 1
oxidize (burn) the supplied unburned fuel by means of the DOC, whereby the temperature of the exhaust gas at an entrance of the DPF is raised
Implementation Method 2
traps particulate matter (hereinafter referred to as PM) in an exhaust gas from a diesel engine via a diesel particulate filter (hereinafter referred to as DPF)
Implementation Method 3
PM trapped by the DPF is continuously burned for purification
Data Source
AI summary
A diesel particulate filter (“DPF”) system that suppresses clogging of a DPF and enhances convenience including accumulated particulate matter (“PM”) quantity estimator for estimating an accumulated PM quantity in an idle state; and a long low idle forced regeneration unit 5 that if the accumulated PM quantity estimated by the accumulated PM quantity estimation estimator exceeds a predetermined quantity, performs long low idle forced regeneration that automatically performs regeneration of the DPF, and the long low idle forced regeneration unit, when a vehicle starts moving during long low idle forced regeneration, performs automatic regeneration of the diesel particulate filter while the vehicle is moving.