Exhaust Purification Apparatus Fuel Component Estimation
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Solution Overview
Problem
Conventional exhaust purification apparatuses fail to accurately estimate the accumulation of sulfur components and unburned fuel in exhaust purification elements due to temperature-dependent removal characteristics, leading to inadequate removal and impaired function.
Innovation Solution
An exhaust purification apparatus equipped with temperature sensors and a control unit that estimates the discharge and removal of fuel components based on exhaust gas temperature, allowing for precise calculation of accumulation amounts and forced removal when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional estimation methods based on fuel consumption and sulfur content are used, then the system structure remains simple, but the accumulation amount of sulfur components cannot be estimated with high precision due to temperature-dependent removal characteristics
Solution Approach 1:
The invention changes the estimation approach from static (based only on fuel consumption and sulfur content) to dynamic by incorporating exhaust gas temperature as a variable parameter. The control unit calculates the accumulation amount by considering temperature-dependent removal characteristics, where sulfur components are removed more effectively at higher temperatures. This allows precise estimation without requiring additional physical sensors for sulfur measurement.
Solution Approach 2:
The invention replaces direct physical measurement of sulfur accumulation (which would require complex sensors and measurement systems) with a computational estimation method. The control unit uses mathematical calculations based on fuel consumption, sulfur content, and exhaust temperature to estimate accumulation, substituting mechanical/physical measurement systems with an information-processing approach.
2Reliability
If temperature-dependent removal characteristics are not considered, then the estimation process remains simple, but forced removal may not be triggered even when sulfur components have accumulated to allowable limits
Solution Approach 1:
The invention implements a feedback mechanism where the control unit continuously monitors exhaust gas temperature and adjusts the accumulation estimation accordingly. When the estimated accumulation reaches a predetermined threshold, the system triggers forced removal operations. This feedback loop ensures reliable forced removal functionality while adapting to varying operating conditions.
Solution Approach 2:
The system performs preliminary estimation of sulfur component accumulation by considering temperature-dependent removal characteristics before actual accumulation reaches problematic levels. This allows the control unit to proactively trigger forced removal operations at appropriate times, preventing catalyst degradation and maintaining system reliability.
3Measurement precision
If accumulation amount is estimated without considering temperature effects, then calculation complexity remains low, but unburned fuel and other fuel components cannot be accurately monitored
Solution Approach 1:
The invention extends the estimation methodology to cover multiple fuel components (sulfur, unburned hydrocarbons, etc.) by incorporating exhaust gas temperature as a key parameter. The control unit calculates removal amounts for different components based on temperature-dependent characteristics, enabling comprehensive monitoring with enhanced precision without requiring separate measurement systems for each component.
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
Enables high-precision estimation and removal of accumulated fuel components, ensuring continuous proper function of the apparatus by accounting for temperature-dependent removal processes.
Implementation Method 1
a temperature sensor adapted to measure a temperature of exhaust gas that flows into the exhaust purification element
Implementation Method 2
the sulfur components accumulated in the exhaust purification element will be decreased in a region in which a temperature of the exhaust gas is higher than an temperature at which the sulfur components are removed
Data Source
AI summary
Based on a fuel supplying amount in accordance with an engine operating condition, a discharge amount of a predetermined fuel component contained in exhaust gas to be discharge per unit time is estimated, and integrated by an accumulation amount of the fuel component accumulated in an exhaust purification element. Furthermore, according to an exhaust gas temperature that flows into the element, an amount of the fuel component to be removed from the element per unit time is estimated, and the amount is subtracted from the accumulation amount. When the accumulation amount is equal to or greater than a predetermined value, a determination is made that a timing to forcefully remove the fuel component accumulated in the element has arrived. Then, an alarming lamp is lightened, and a forceful removing processing is performed by raising a temperature of the exhaust gas above a temperature at which the fuel component is removed.