Exhaust Gas Post-Treatment Heating Speed via Active and Combustion Methods
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Solution Overview
Problem
Existing exhaust gas post-treatment devices for internal combustion engines face challenges in quickly and reliably achieving target temperatures, leading to ineffective pollutant emission conversion due to limited heat input power and heat retention issues, especially during varying driving states.
Innovation Solution
A method that combines active heating measures with post-injection to rapidly heat the exhaust gas system, calculating the required temperature rise and using a combination of heating elements and post-injection to ensure the SCR system reaches target temperatures, while monitoring component protection to prevent overheating and optimize emissions reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If only a heating element is used to heat the exhaust gas system, then the system structure remains simple, but the target temperature cannot be reached within the required time due to limited heat input power
Solution Approach 1:
The patent combines two different heating methods - active heating element (electrical heating) and post-injection (combustion heating) - into a unified heating system. The control unit selectively activates either or both heating methods based on real-time temperature measurements and system state, thereby achieving high heating speed without permanently increasing system complexity.
Solution Approach 2:
The heating system dynamically switches between different heating modes (active heating only, post-injection only, or combination) based on real-time feedback from temperature sensors and system state. This dynamic adaptation allows the system to optimize heating speed for each specific operating condition without requiring complex hardware for all possible scenarios.
2Speed
If post-injection is always used to heat the exhaust gas system, then the target temperature is reached quickly, but the system becomes complex and component protection temperatures may be exceeded
Solution Approach 1:
The control unit continuously monitors exhaust gas temperature, component temperatures, and system state through various sensors. Based on this feedback, it dynamically adjusts the heating strategy - activating post-injection only when safe, using active heating when sufficient, or combining both - thereby achieving fast heating while preventing component damage through real-time temperature management.
Solution Approach 2:
The system changes operational parameters (heating method selection, injection timing, injection quantity) based on real-time temperature measurements and system state. By dynamically adjusting these parameters, the system achieves rapid heating when conditions permit while preventing overheating and component damage, thus maintaining reliability.
3Stability of the object's composition
If the heating element operates continuously to maintain target temperature, then temperature stability is improved, but energy consumption increases
Solution Approach 1:
Instead of continuous operation, the heating element and post-injection system operate periodically or intermittently based on real-time temperature measurements. The control unit activates heating only when temperature drops below the target threshold and deactivates it when the target is reached or exceeded, thereby maintaining temperature stability while minimizing energy consumption through on-demand 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 allows for quick and efficient heating of the exhaust gas system to effective conversion temperatures, ensuring rapid and reliable pollutant emission reduction while protecting system components.
Implementation Method 1
a heating element, which is designed to cause an active introduction of heat energy into the exhaust gas and/or into the oxidation catalyst at a heating point
Implementation Method 2
an oxidation catalyst having a catalytic coating, which oxidation catalyst is thus at least partially formed by catalytic coating
Implementation Method 3
an SCR system arranged downstream of the introduction point, which can in particular have an SCR catalyst
Implementation Method 4
a minimum temperature for carrying out a post-injection of the internal combustion engine has been reached
Data Source
AI summary
A method for operating an exhaust gas post-treatment device for an internal combustion engine. The exhaust gas post-treatment device has an oxidation catalyst having a catalytic coating, a heating element upstream of the oxidation catalyst or a heating element provided with the catalytic coating with which heat energy can be introduced actively into the exhaust system at a heating point. The exhaust gas post-treatment device further has a dosing element with which a reducing agent can be introduced into the exhaust gas at an introduction point arranged downstream of the oxidation catalyst and has an SCR system arranged downstream of the introduction point. The method provides checking whether target temperatures have been reached in the exhaust gas system. If the target temperatures are fallen short of, the target temperatures can be reached within a defined period of time by using the heating element and by carrying out a post-injection.