Exhaust Hollow-Space Heating for Faster Catalyst Warm-Up
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Solution Overview
Problem
Catalytic system components in exhaust systems of combustion engines are often inactive at ambient temperatures, leading to inefficient catalysis and unacceptable exhaust emission values, particularly during cold starting and low load conditions, due to the thermal ballast effect of the exhaust system components.
Innovation Solution
Incorporating a reactive heating system with a closed hollow space structure and a stationary mobile system component pair that reacts exothermically within the structure to rapidly heat up catalytic system components, utilizing a double-walled casing or gap housing design to prevent substance exchange and enhance heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the exhaust system uses standard insulation, then the system structure remains simple, but the catalytic system components cannot reach working temperature quickly enough
Solution Approach 1:
The patent applies preliminary action by incorporating a heating element into the exhaust system that activates before the catalytic converter needs to operate. The heating element pre-heats the exhaust system components, particularly the catalytic converter, during cold start conditions, ensuring they reach working temperature faster than would occur with insulation alone.
Solution Approach 2:
The patent changes the thermal parameter of the exhaust system by introducing an active heating mechanism that alters the temperature profile. The heating element provides additional thermal energy to change the temperature parameter of the catalytic system components from ambient to operating temperature more rapidly.
2Loss of energy
If the exhaust system components are well-insulated, then heat loss is reduced, but the thermal ballast effect still slows temperature increase of catalytic components
Solution Approach 1:
The heating element acts as an intermediary device between the exhaust gas flow and the catalytic converter. It mediates the heat transfer process by providing an additional heat transfer path that bypasses the thermal mass of the exhaust system components, directly heating the catalytic converter to overcome the thermal ballast effect.
3Adaptability or versatility
If catalytic system components are positioned further in the exhaust system, then more components can be included, but their temperature increases more slowly due to thermal ballast
Solution Approach 1:
The patent applies segmentation by dividing the heating function into multiple zones along the exhaust system. Heating elements are strategically positioned at different locations to ensure that each catalytic component, regardless of its position in the exhaust system, receives adequate thermal energy to reach and maintain operating temperature.
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 enables rapid heating of catalytic system components to their working temperature, significantly reducing exhaust emission values by leveraging exothermic reactions and minimizing heat loss, thus improving the efficiency and effectiveness of the exhaust system.
Implementation Method 1
a reactive heating system comprises a stationary and a mobile system component which in the reaction chamber react with each other in an exothermic reaction subject to the release of reaction heat
Data Source
AI summary
The invention relates to a system component of an exhaust system for a combustion engine, more preferably of a motor vehicle, with at least one component portion having a closed hollow space structure (2), wherein walls of the closed hollow space structure (2) enclose a reaction chamber (5), in which at least one stationary system component (6) of a reactive heating system is arranged. By using a reactive heating system a rapid heating-up of at least one system component of the exhaust system is advantageously possible.