Induction Heating Catalytic Converter for Cold Start Light-Off
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Solution Overview
Problem
Conventional catalytic converters rely solely on engine heat, which can lead to inefficient emissions treatment during cold starts, cool-downs, and hybrid vehicle operations, as they struggle to maintain the required light-off temperature of 300°C, resulting in reduced catalytic reaction efficiency.
Innovation Solution
The emission control system employs a combination of induction heating and electrohydrodynamic (EHD) heat and mass transfer to rapidly heat the catalytic converter, using temperature sensors and a controller to manage electromagnetic field generation and EHD processes, ensuring the catalytic converter reaches and maintains optimal temperatures for efficient emissions treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional catalytic converters rely solely on engine heat, then the system structure remains simple, but the light-off temperature cannot be maintained during cold starts and hybrid operations, resulting in reduced catalytic reaction efficiency
Solution Approach 1:
The patent replaces the conventional passive thermal system (relying solely on engine heat) with an active electromagnetic induction heating system. An induction coil generates an electromagnetic field that induces eddy currents in the catalytic converter substrate, converting electrical energy directly into thermal energy within the catalyst itself. This substitution enables rapid heating and precise temperature control, ensuring reliable catalytic reaction efficiency during cold starts and hybrid operations without overly complicating the system architecture.
Solution Approach 2:
The patent implements dynamic control of the induction heating parameters (power level, frequency, duration) based on real-time temperature feedback from sensors. The controller adjusts these parameters to maintain the catalytic converter at optimal operating temperature (above 300°C light-off temperature) under varying conditions such as cold starts, idle operation, and hybrid vehicle modes. This parameter adjustment ensures consistent catalytic efficiency while adapting to different operational scenarios.
2Productivity
If induction heating is used to rapidly heat the catalytic converter, then the light-off process is accelerated and optimal temperature is maintained, but the device complexity increases due to additional components
Solution Approach 1:
The patent merges the induction heating functionality with the existing catalytic converter assembly by integrating the induction coil around the converter housing and embedding heating elements or conductive materials within the substrate structure. This consolidation allows the heating function to be added without proportionally increasing overall system complexity, as the heating components are tightly integrated with the catalytic converter rather than being separate auxiliary systems.
Solution Approach 2:
The catalytic converter substrate is designed with inherent electromagnetic properties (conductive material distribution, geometric features) that enable it to self-heat when exposed to the induction field. The substrate's own structure acts as the heating element through induced eddy currents, eliminating the need for separate heating elements or complex thermal transfer mechanisms. This self-service approach accelerates light-off while minimizing additional components.
3Measurement precision
If multiple temperature sensors and controlled induction heating are implemented, then temperature control precision is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent strategically places temperature sensors at specific locations within the catalytic converter assembly (e.g., upstream and downstream of the catalyst bed, or at different radial positions) to capture localized temperature gradients. This selective sensing provides sufficient temperature control information without requiring comprehensive coverage of every point in the converter, thereby maintaining manufacturing simplicity while achieving adequate temperature control precision for effective catalytic operation.
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 enhances the performance of the catalytic converter system by accelerating the light-off process, maintaining optimal temperatures during various operational conditions, and improving emissions treatment efficiency, even during cold starts and idling phases.
Implementation Method 1
The emission control system employs a combination of induction heating and electrohydrodynamic (EHD) heat and mass transfer to rapidly heat the catalytic converter
Implementation Method 2
The emission control system employs a combination of induction heating and electrohydrodynamic (EHD) heat and mass transfer to rapidly heat the catalytic converter
Data Source
AI summary
In various embodiments, an electromagnetic field generator generates one or more power signals applied to one or more coils to cause the induction heating of the pins of the emission control device, The pins can have a plurality of differing lengths, and the heating of the pins can cause a first region of the emission control device to heat faster than a second region of the emission control device.