Catalytic Converter Temperature Estimation via Stored Reactant Tracking
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Solution Overview
Problem
Conventional methods for estimating and controlling the temperature of catalytic converters in internal combustion engines fail to account for transient heating during dynamic driving operations, leading to inefficiencies in fuel consumption and emissions due to excessive safety margins.
Innovation Solution
A method that tracks the stored reactants in the catalytic converter, such as oxygen and hydrocarbons, to calculate temperature corrections and adjust the mixture supply, reducing the safety margin by considering time-dependent energy storage and desorption behavior, and accounting for catalyst aging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large safety margin is used to control catalytic converter temperature, then the converter is protected from overheating, but fuel consumption increases and engine performance deteriorates
Solution Approach 1:
The safety margin is made dynamic rather than static. The control device adjusts the safety margin in real-time based on detected driving patterns, particularly deceleration fuel cut-off events. During transient conditions with stored reactants, the safety margin is reduced to allow higher temperatures, while during steady-state operation it is maintained at higher levels for protection.
Solution Approach 2:
The system continuously monitors exhaust gas composition and temperature to detect when stored reactants are present in the catalytic converter. This feedback information is used to adjust the safety margin dynamically, allowing the system to optimize temperature control based on actual converter state rather than using a fixed conservative margin.
2Use of energy by moving object
If the safety margin is reduced to optimize fuel consumption, then fuel efficiency improves, but the risk of overheating the catalytic converter increases
Solution Approach 1:
The system detects deceleration fuel cut-off events in advance, which indicate that stored reactants will be present in the catalytic converter during subsequent acceleration. This preliminary detection allows the control device to adjust the safety margin proactively before the transient heating event occurs, optimizing the balance between fuel efficiency and overheating prevention.
Solution Approach 2:
The safety margin is dynamically adjusted based on real-time detection of stored reactants through exhaust gas composition monitoring. When stored reactants are detected, the safety margin is reduced to allow higher temperatures and optimize fuel consumption. When stored reactants are not present, a larger safety margin is applied to prevent overheating.
3Device complexity
If conventional temperature estimation methods are used, then the system is simple to implement, but transient heating effects are not accounted for leading to inaccurate temperature control
Solution Approach 1:
The system uses the engine control apparatus's existing exhaust gas composition detection capabilities to monitor for stored reactants. Rather than adding separate temperature sensors or complex estimation systems, the approach leverages existing sensors and processing to detect conditions that indicate transient heating, maintaining simplicity while improving accuracy.
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 allows for more precise temperature control, reducing fuel consumption and emissions by minimizing the safety margin, thereby optimizing engine performance and extending catalytic converter lifespan.
Implementation Method 1
When the internal combustion engine is operated for a time with a rich mixture, non-combusted hydrocarbons and carbon monoxide collect in the catalytic converter. As soon as only the smallest quantities of oxygen are present in the exhaust gas flow supplied to the catalytic converter, i.e. on transition to a lean mixture, these hydrocarbons are abruptly converted in the catalytic converter and this leads to a corresponding increase in temperature.
Implementation Method 2
An exhaust gas catalytic converter is connected downstream from internal combustion engines of modern motor vehicles, in particular petrol engines, and is used to reduce pollutants contained in the exhaust gas
Implementation Method 3
By using a rich mixture, the supply of oxygen to the catalytic converter is restricted and as a result of this, less heat is released in the catalytic converter owing to the catalytic oxidation of the remaining hydrocarbons and carbon monoxides contained in the exhaust gas.
Data Source
AI summary
The aim of the invention is to estimate a temperature jump (ΔT) of a catalytic converter of an internal combustion engine in the event of a change in the composition of the exhaust gas. To this end, a quantity of a reactand (SI) stored in the catalytic converter is monitored (2-7), and the heating (ΔT) of the catalytic converter resulting from the reaction heat released during the reaction of the stored reactand is assumed (13, 14, 16, 17) as the temperature jump (ΔT).