Catalytic Converter Heating Control via Energy Balance Modeling
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Solution Overview
Problem
Existing methods for controlling emissions in internal combustion engines are limited by inaccurate modeling of thermal behavior in exhaust systems, lack of direct temperature sensing in catalytic converters, and inefficient use of waste heat for heating, leading to suboptimal emission reduction.
Innovation Solution
An energy balance model is used to simulate the heat emitted by an electrical heating element in the exhaust gas duct, considering radiation, convection, and conduction, to optimize the temperature of catalytic converters, allowing for precise control of emissions by adjusting the heating element's operation based on predefined targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is arranged in a catalytic converter to directly measure temperature, then measurement precision is improved, but device complexity and difficulty of detecting and measuring increase
Solution Approach 1:
The patent introduces an intermediary energy balance model that calculates catalytic converter temperature based on measurable parameters (exhaust gas temperature, heating element power, ambient temperature) rather than directly measuring it. This mediator translates easily measurable quantities into the desired temperature information without requiring complex sensor integration inside the catalytic converter.
Solution Approach 2:
The patent replaces the mechanical/physical temperature sensor system with a computational thermal model. Instead of using a physical sensor to detect temperature, the system uses an energy balance calculation that substitutes direct measurement with indirect computation based on heat transfer principles and measurable operating parameters.
2Device complexity
If previous approaches for modelling thermal behavior are used, then device complexity is kept simple, but manufacturing precision and reliability of temperature prediction deteriorate
Solution Approach 1:
The patent improves temperature prediction accuracy by incorporating multiple dynamic parameters into the energy balance model, including heating element power consumption, exhaust gas temperature, ambient temperature, and catalyst mass. This parameter-based approach transforms a simple model into a precise predictive tool without requiring complex hardware.
Solution Approach 2:
The patent implements feedback by continuously updating the energy balance model with real-time measurements of exhaust gas temperature and heating element power. This closed-loop approach allows the model to adapt to changing operating conditions and maintain high prediction accuracy throughout the catalytic converter's thermal transient phases.
3Ease of operation
If the heating element is operated without precise temperature modeling, then ease of operation is improved, but loss of energy increases due to inefficient heating
Solution Approach 1:
The patent uses feedback from the energy balance model to optimize heating element operation. The model predicts the catalytic converter temperature based on current heating power and exhaust conditions, allowing the control system to adjust heating power dynamically. This feedback mechanism eliminates energy waste by reducing or stopping heating when the catalytic converter is already at optimal temperature.
Solution Approach 2:
The patent applies preliminary action by using the energy balance model to predict future temperature trends before they occur. The system can anticipate when the catalytic converter will reach optimal temperature and pre-adjust heating power accordingly, preventing energy waste from overshooting the target temperature or prolonged heating beyond what is necessary.
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 more accurate prediction and control of catalytic converter temperatures, resulting in improved emission reduction and efficiency with reduced energy consumption and thermal wear.
Implementation Method 1
The energy balance model models the heating element as an energy balance or by means of an energy balance at least between the electrical energy or power supplied to the heating element and the heat emitted by the heating element via heat radiation and convection
Implementation Method 2
the heat emitted by the heating element via heat radiation and convection
Implementation Method 3
Moreover, heat emitted by the heating element by heat conduction can be modeled or taken into account in the energy balance model or in the energy balance
Implementation Method 4
a catalytic converter, in particular a diesel oxidation catalytic converter (DOC)
Data Source
AI summary
A method for operating a motor vehicle includes a first step of automatically simulating, a second step of determining an operating strategy, and a third step of operating the motor vehicle. In the first step, a quantity of heat emitted by the heating element to the exhaust gas flow and/or to the catalytic converter is automatically simulated by a predefined energy balance model, which models the heating element as an energy balance at least between the electrical energy supplied to the heating element and the quantity of heat emitted by the heating element via heat radiation and convection. In the second step, an operating strategy for the motor vehicle is determined on the basis of a corresponding simulation result in order to achieve a predefined target temperature range of the catalytic converter. In the third step the motor vehicle is operated according to the determined operating strategy.