Filter Regeneration System for Internal Combustion Engine
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Solution Overview
Problem
Existing filter regeneration systems for internal combustion engines are inefficient in removing particulate matter (PM) using the passive regeneration reaction of the C—NO2—O2 reaction, as they fail to maintain the required oxygen and nitrogen dioxide concentrations for optimal reaction conditions.
Innovation Solution
A system that calculates the minimum oxygen and nitrogen dioxide concentrations needed for the C—NO2—O2 reaction based on the PM amount and controls the exhaust gas temperature to ensure these concentrations are met, allowing the passive regeneration reaction to occur preferentially, thereby efficiently removing PM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the passive regeneration reaction of C—NO2—O2 is used to remove PM from the filter, then the reaction speed is higher at low temperature, but the PM cannot be efficiently removed in related art due to insufficient control of oxygen and nitrogen dioxide concentrations
Solution Approach 1:
The invention changes the parameters of oxygen concentration and nitrogen dioxide concentration in the exhaust gas to ensure they meet the minimum required values for the C—NO2—O2 reaction. By controlling these chemical concentration parameters, the system enables the passive regeneration reaction to occur reliably and efficiently at low temperatures, resolving the contradiction between high reaction speed and reliable PM removal.
2Speed
If the temperature of exhaust gas is increased to promote regeneration, then the reaction speed increases, but fuel consumption increases due to active regeneration processes
Solution Approach 1:
Instead of changing the temperature parameter to increase reaction speed, the invention changes the chemical concentration parameters (oxygen and nitrogen dioxide) to enable the passive regeneration reaction. This allows the C—NO2—O2 reaction to proceed at low temperatures, maintaining high reaction speed while avoiding the energy consumption associated with high-temperature active regeneration processes.
Solution Approach 2:
The invention substitutes the thermal-mechanical approach (heating exhaust gas to increase temperature for faster reaction) with a chemical approach (controlling oxygen and nitrogen dioxide concentrations). This replacement of the temperature-based mechanism with a concentration-based mechanism achieves high reaction speed without the energy penalty of heating, thereby reducing fuel consumption.
3Productivity
If active regeneration reaction is used to remove PM, then PM removal is achieved, but frequent regeneration processes are required which increases fuel consumption
Solution Approach 1:
The invention changes the chemical environment parameters by ensuring sufficient oxygen and nitrogen dioxide concentrations in the exhaust gas. This enables the passive regeneration reaction (C—NO2—O2) to occur continuously and efficiently at low temperatures, providing sustained PM removal capability without requiring frequent active regeneration cycles, thereby reducing overall fuel consumption.
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 ensures reliable and efficient removal of PM using the passive regeneration reaction, reducing the need for wasteful temperature increases and lowering the frequency of active regeneration processes, which in turn reduces fuel consumption.
Implementation Method 1
a passive regeneration reaction, in which carbon in PM (Particulate Matter) accumulated on a filter arranged in an exhaust gas passage of the internal combustion engine reacts with nitrogen dioxide and oxygen to generate carbon dioxide and nitrogen monoxide
Data Source
AI summary
A filter regeneration system for an internal combustion engine, the filter regeneration system including: a calculation unit configured to calculate a minimum oxygen concentration and a minimum nitrogen dioxide concentration at which a passive regeneration reaction, in which carbon in PM accumulated on a filter arranged in an exhaust gas passage of the internal combustion engine reacts with nitrogen dioxide and oxygen to generate carbon dioxide and nitrogen monoxide, occurs based on an amount of the PM accumulated on the filter; and an exhaust gas temperature control unit configured to, in a case where an oxygen concentration and a nitrogen dioxide concentration in exhaust gas on an upstream of the filter are equal to or higher than the minimum oxygen concentration and the minimum nitrogen dioxide concentration, respectively, control a temperature of exhaust gas flowing into the filter within a temperature range in which the passive regeneration reaction occurs preferentially.