Exhaust Gas Subsystem External Heating for Catalyst Temperature Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing exhaust gas sub-systems for internal combustion engines face challenges in achieving improved cold start and optimal temperature control of catalytic converters, as they often rely on inefficient heating methods that are integrated with the engine or lack effective temperature regulation.
Innovation Solution
The introduction of a separate, externally controlled heating element that supplies heated secondary gas to the catalytic converter through a dedicated feed line, allowing for independent temperature control and efficient preheating during cold starts and normal operation, with the inflow element and inlet section designed to optimize gas flow and mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heating element is integrated into the exhaust system, then the catalytic converter can be heated, but the system complexity increases and temperature control precision deteriorates
Solution Approach 1:
The heating function is segmented from the exhaust system by using a separate, externally controlled heating element that heats secondary gas in an external chamber. This secondary heated gas is then introduced into the exhaust system through a dedicated inlet, separating the heating function from the exhaust gas flow path and reducing system complexity while maintaining temperature control capability.
Solution Approach 2:
Secondary gas acts as an intermediary medium. The heating element heats this secondary gas externally, and then this pre-heated secondary gas serves as a carrier to transfer thermal energy to the exhaust gas and catalytic converter. This intermediary approach allows independent control of the heating process from the exhaust system.
2Temperature
If the heating element is part of the combustion engine, then integration is achieved, but temperature regulation precision deteriorates
Solution Approach 1:
The heating element is extracted from the combustion engine system and positioned externally. This external heating element can be independently controlled through a control unit that regulates the heating process separately from engine operation, enabling precise temperature regulation of the catalytic converter regardless of engine running conditions.
Solution Approach 2:
The system enables dynamic temperature control by allowing the heating element to be activated or deactivated independently of engine operation. The control unit can adjust heating intensity and duration to match catalytic converter temperature requirements, providing flexible and precise temperature regulation that adapts to different operating scenarios.
3Temperature
If secondary gas is heated externally, then temperature control precision improves, but heat loss increases
Solution Approach 1:
The secondary gas is pre-heated in an external chamber before being introduced into the exhaust system. This preliminary heating action allows the gas to carry thermal energy directly to the catalytic converter, reducing the overall heat loss compared to heating the exhaust gas directly, as the heating occurs in a controlled environment with minimal heat dissipation to the surroundings.
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 enables efficient preheating of the catalytic converter during cold starts and precise temperature control during normal operation, reducing heat losses and improving the overall performance of the exhaust gas sub-system by using a separate heating element that is not part of the engine.
Implementation Method 1
a heating element for heating the secondary gas is provided in the feed line upstream of the inflow element
Implementation Method 2
the inflow element, together with the inlet section designed as an outer housing, delimits a collecting chamber from which the secondary gas can be guided or fed via the inflow opening into the exhaust gas carrying part of the inlet section
Data Source
AI summary
The disclosure relates to an exhaust gas sub-system for an internal combustion engine, having a catalytic converter with an inlet section for introducing an exhaust gas flow into the outer housing and having a feed line for secondary gas, the feed line having an inflow element at the end, which opens at the inlet section, the outer housing has an inlet opening for exhaust gas, an external heating element for heating the secondary gas and for generating hot gas being provided in the feed line upstream of the inflow element, at least one inflow opening in the outer housing being assigned to the inflow element, via which hot gas can be fed into the inlet section.