Exhaust Hydrocarbon Injection Control for Particulate Filter Regeneration
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Solution Overview
Problem
Existing engine control systems face challenges in accurately controlling the temperature of exhaust gas to regenerate particulate filters, as some injected fuel accumulates on surfaces and evaporates at varying rates, affecting the combustion temperature and efficiency of particulate matter combustion.
Innovation Solution
A system comprising an injection control module and a fuel film module that determines the accumulation and release rates of fuel on exhaust system surfaces, adjusting the fuel flow rate to maintain optimal temperature for particulate matter combustion, using temperature sensors and fuel film models to correct the fuel flow based on accumulation, release, and loss rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fuel is injected into the exhaust system to increase exhaust gas temperature for PM filter regeneration, then the regeneration efficiency is improved, but fuel accumulates on exhaust system surfaces and evaporates at varying rates, causing temperature control inaccuracies
Solution Approach 1:
The control system continuously monitors exhaust gas temperature and fuel accumulation on exhaust system surfaces, using this feedback to dynamically adjust the fuel injection rate. This closed-loop control compensates for the varying evaporation rates of accumulated fuel, maintaining accurate temperature control while ensuring effective PM filter regeneration.
Solution Approach 2:
The system predicts fuel accumulation on exhaust system surfaces based on injection rate and temperature conditions, and pre-adjusts the injection strategy to compensate for expected evaporation losses. This preliminary action prevents temperature deviations before they occur, improving both regeneration efficiency and temperature control accuracy.
2Measurement precision
If the fuel injection rate is increased to compensate for fuel loss due to surface accumulation and evaporation, then temperature control is improved, but fuel consumption increases
Solution Approach 1:
The control system dynamically adjusts fuel injection parameters (rate, timing, duration) based on real-time conditions including exhaust gas temperature, fuel accumulation rate, and evaporation characteristics. By optimizing these parameters, the system achieves accurate temperature control while minimizing fuel consumption, avoiding both under-injection (poor temperature control) and over-injection (excessive fuel use).
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 ensures precise control of exhaust gas temperature, enhancing the regeneration efficiency of particulate filters by compensating for fuel accumulation and release, thereby maintaining effective combustion of particulate matter and optimizing engine performance.
Implementation Method 1
The fuel film module determines an accumulation rate of fuel on a surface of the exhaust system based on the flow rate of the fuel
Implementation Method 2
The fuel film module determines a release rate of fuel from the surface of the exhaust system based on a flow rate of the exhaust gas
Implementation Method 3
Most of the injected fuel mixes with the exhaust gas and combusts in the oxidation catalyst. The combustion heats the exhaust gas, thereby increasing the temperature of the exhaust gas entering the PM filter
Implementation Method 4
The increased temperature of the exhaust gas may cause the PM to combust
Data Source
AI summary
A system comprises an injection control module and a fuel film module. The injection control module controls a flow rate of fuel injected into an exhaust system to adjust a temperature of exhaust gas. The fuel film module determines an accumulation rate of fuel on a surface of the exhaust system based on the flow rate of the fuel. The fuel film module determines a release rate of fuel from the surface of the exhaust system based on a flow rate of the exhaust gas. The injection control module adjusts the flow rate of the fuel based on the accumulation rate and the release rate.