Exhaust Gas Heating Element for Catalytic Converter Warm-Up
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Internal combustion engines face challenges in reducing harmful emissions during the start phase due to insufficient catalytic converter temperatures, requiring significant engine management interventions like late ignition or fuel injection to heat up catalytic converters and particle filters.
Innovation Solution
An exhaust gas heating unit with a high-temperature-resistant jacket heating conductor element and heat transfer surface formation, utilizing thermal energy to efficiently heat system areas, including catalytic converters, through heat transfer and potentially catalytic reactions, with configurations such as helical or meandering designs and catalytically active materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If late ignition or fuel injection is used to heat exhaust system components, then the temperature of catalytic converters is increased, but major interventions in engine management are required
Solution Approach 1:
An electric heating element is introduced as an intermediary device to heat the exhaust gas and catalytic converter independently of engine management changes. The heating element acts as a mediator between the power source and the exhaust system, enabling temperature control without modifying ignition or fuel injection parameters.
Solution Approach 2:
The mechanical/engine-based heating method (late ignition or fuel injection) is replaced with an electrical heating system. This substitution eliminates the need for complex engine management interventions while achieving the same goal of heating the catalytic converter to operational temperature.
2Temperature
If electric heating element is used in exhaust gas, then heating of catalytic converters is achieved, but the heating element must withstand high temperatures and corrosive exhaust environment
Solution Approach 1:
The heating element employs a composite structure consisting of a corrosion-resistant outer sheath (e.g., stainless steel or Inconel) and an inner heating wire (e.g., nickel-chromium alloy). This composite design provides both thermal conductivity and resistance to the harsh exhaust environment, ensuring reliability at high temperatures.
Solution Approach 2:
The heating element is pre-protected with a corrosion-resistant sheath and appropriate material selection before exposure to the exhaust environment. This beforehand protection prevents degradation from the outset, cushioning the element against the corrosive and high-temperature conditions of the exhaust system.
3Productivity
If heat transfer surface area is increased to improve heating efficiency, then heat transfer to exhaust gas is enhanced, but the device complexity and size increase
Solution Approach 1:
The heating element uses a helical or spiral configuration, transforming a linear heating wire into a three-dimensional structure that maximizes surface area within a compact volume. This dimensional transformation allows efficient heat transfer without proportionally increasing device size or complexity.
Solution Approach 2:
The heating element is formed into a curved or coiled shape rather than a straight line. This curvature increases the surface area in contact with the exhaust gas flow, enhancing heat transfer efficiency while maintaining a compact form factor and avoiding complex structural additions.
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
Enables rapid heating of exhaust system components, supports catalytic reactions, and reduces harmful emissions by efficiently transferring heat and potentially catalyzing reactions even at low temperatures, thus addressing the emission challenges during engine start-up.
Implementation Method 1
an electrical heating conductor which extends in the jacket and is surrounded by insulating material
Implementation Method 2
a heat transfer surface formation which is arranged on an outer side of the jacket and is in heat transfer contact with same
Data Source
AI summary
An exhaust gas heating unit for an exhaust system of an internal combustion engine includes a jacket heating conductor element (12) with a jacket (16) and with an electrical heating conductor (14). The electrical heating conductor (14) extends in the jacket (16) and is surrounded by insulating material (18). A heat transfer surface formation (20) is arranged on an outer side of the jacket (16) and is in heat transfer contact with same.