Engine Exhaust Control for Invisible Smoke Emissions
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Solution Overview
Problem
Internal combustion engines emit visible smoke, despite meeting legal emission requirements, which can contaminate nearby surfaces and are considered undesirable by operators.
Innovation Solution
An engine data processor adjusts the exhaust gas composition by determining a smoke visibility limit based on geometric characteristics, filter fill status, and catalytic converter temperature to ensure the exhaust gas remains invisible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the internal combustion engine operates to meet legal emission requirements, then nitrogen oxide emission limits are satisfied, but visible smoke is still emitted causing surface contamination
Solution Approach 1:
The control system dynamically adjusts engine operating parameters (such as injection timing, air-fuel ratio, or EGR rate) based on real-time measurements of nitrogen dioxide concentration and filter fill status. This allows the engine to maintain compliance with nitrogen oxide emission limits while optimizing the exhaust gas composition to minimize visible smoke formation, thereby resolving the contradiction between meeting legal requirements and preventing visible smoke emission.
2Object-generated harmful factors
If the nitrogen dioxide conversion rate is increased to reduce visible smoke, then smoke visibility is improved, but the system complexity increases due to multiple sensors and calculations
Solution Approach 1:
The control system implements a feedback mechanism that continuously monitors nitrogen dioxide concentration in the exhaust gas and filter fill status, then automatically adjusts engine operating parameters to maintain optimal nitrogen dioxide conversion rates. This closed-loop control approach enables effective smoke reduction while managing system complexity through automated regulation rather than manual intervention.
Solution Approach 2:
The system uses the existing exhaust gas flow and catalytic converter infrastructure to achieve nitrogen dioxide conversion, leveraging the natural thermal and chemical properties of the exhaust system. By integrating the control logic into the existing engine management system and using already-available sensor data, the solution minimizes additional hardware complexity while achieving the desired smoke reduction effect.
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
The solution enables clean and cost-effective operation of internal combustion engines without visible smoke, considering installation-specific attributes and real-time adjustments.
Implementation Method 1
receive a mean catalytic converter temperature of an exhaust gas catalytic converter designed to catalyze the exhaust gas composition
Implementation Method 2
receive filter fill status information from an exhaust gas filter designed to filter the exhaust gas composition
Data Source
AI summary
An engine data processor for an internal combustion engine is structured and arranged for: receiving a geometric characteristic of an exhaust unit through which the exhaust gas composition can be discharged, and determining from the geometric characteristic a smoke visibility limit value; receiving filter fill status information from an exhaust gas filter for filtering the exhaust gas composition; receiving a mean catalytic converter temperature of an exhaust gas catalytic converter for catalyzing the exhaust gas composition and determining a nitrogen dioxide conversion rate subject to the filter fill status information which has been received and the mean catalytic converter temperature; comparing the calculated nitrogen dioxide conversion rate with the smoke visibility limit value, and determining therefrom a control variable for the internal combustion engine so that the exhaust gas composition is invisible; and issuing the control variable.