Exhaust Filter Regeneration Control via Dynamic Temperature Targeting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electronic control systems for exhaust gas particulate filters are slow to react to changing exhaust gas temperatures, leading to inefficient and prolonged regeneration processes, with temperature overshoots causing catalyst damage and incomplete regeneration due to failure to account for partial regeneration events.
Innovation Solution
A closed loop non-linear temperature targeting and fuel control system that adjusts hydrocarbon dosing based on real-time exhaust gas temperatures, using a regeneration management module to set a reference temperature and index the regeneration temperature target, minimizing fuel consumption and preventing catalyst damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If electronic control systems use conventional temperature control methods, then the system structure is simple, but the response speed to temperature changes is slow and regeneration time is prolonged
Solution Approach 1:
The patent implements dynamic temperature targeting where the target temperature is continuously adjusted based on real-time exhaust gas temperature feedback. The control system dynamically modifies the hydrocarbon dosing rate according to actual temperature deviations, enabling rapid adaptation to changing thermal conditions and significantly reducing regeneration time compared to static control methods.
Solution Approach 2:
The system employs closed-loop feedback control by continuously monitoring exhaust gas temperature and comparing it against the target temperature. Based on the temperature deviation, the control algorithm adjusts the hydrocarbon dosing rate in real-time, creating a responsive control mechanism that accelerates temperature response and optimizes regeneration timing.
2Productivity
If electronic control systems increase hydrocarbon dosing to accelerate regeneration, then regeneration speed improves, but fuel consumption increases
Solution Approach 1:
The control system applies partial hydrocarbon dosing rather than maximum dosing throughout the entire regeneration process. By injecting hydrocarbons only when and where needed to maintain target temperature, the system achieves effective regeneration speed while minimizing fuel consumption, avoiding the waste associated with continuous excessive dosing.
Solution Approach 2:
The system dynamically changes the hydrocarbon dosing parameter based on real-time temperature conditions. The dosing rate is adjusted as a variable parameter rather than a fixed value, allowing the system to optimize the balance between regeneration speed and fuel consumption by adapting dosing intensity to actual thermal requirements.
3Productivity
If electronic control systems raise exhaust gas temperature quickly to speed up regeneration, then regeneration efficiency improves, but temperature overshoot occurs causing catalyst damage
Solution Approach 1:
The control system prepares for potential temperature overshoot by implementing predictive control adjustments. When approaching the target temperature, the system proactively reduces hydrocarbon dosing rate to prevent overshoot, cushioning against the harmful effects before they occur and protecting the catalyst from thermal damage.
Solution Approach 2:
Through continuous temperature monitoring and feedback control, the system detects temperature trends and adjusts dosing accordingly. When temperature approaches or exceeds the target, the feedback mechanism triggers immediate dosing reduction, preventing catastrophic overshoot and catalyst damage while maintaining efficient regeneration within safe temperature boundaries.
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 system quickly responds to temperature changes, reducing regeneration time and fuel consumption, preventing catalyst damage, and accounting for partial regeneration events to ensure complete filter regeneration.
Implementation Method 1
The hydrocarbon fuel that is injected into the exhaust gas ignites raising the temperature of the exhaust gas to a temperature where the soot can burn off
Data Source
AI summary
A system and method for controlling the regeneration of an exhaust gas particulate filter. When regeneration is initiated, an outlet temperature of an exhaust gas oxidation catalyst and an outlet temperature of the exhaust gas particulate filter are detected. As part of a closed loop non-linear temperature targeting regime, the maximum of the outlet temperature of the exhaust gas oxidation catalyst and the outlet temperature of the exhaust gas particulate filter is set as a reference temperature. A regeneration temperature target is initialized and indexed based on a profile time and the reference temperature. As part of a closed loop fuel control regime at least one hydrocarbon dosing value is determined based on an exhaust mass flow, the reference temperature, and the regeneration temperature target.