Exhaust Gas Purification Unit Regeneration Control
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Solution Overview
Problem
Existing methods for regenerating diesel particulate filters in low-load or idling situations, such as in refuse removal trucks, often fail to achieve sufficient exhaust gas temperature and mass flow, risking filter destruction or incomplete regeneration due to inadequate consideration of exhaust gas properties.
Innovation Solution
A method that sets a predefined minimum engine speed and torque to ensure the exhaust gas mass flow and temperature exceed specific values during regeneration, thereby creating suitable conditions for filter regeneration, regardless of external temperature control measures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the engine operates at high load for a longer time, then the exhaust gas temperature and mass flow are sufficient for regeneration, but the vehicle application (refuse removal truck) spends significant time on idle speed with short driving distances, resulting in relatively cool exhaust gas
Solution Approach 1:
The control system changes engine operating parameters (speed, load, injection timing) to achieve sufficient exhaust gas temperature and mass flow for regeneration even during idle speed operation. The controller monitors exhaust gas properties and adjusts parameters dynamically to maintain conditions suitable for filter regeneration.
2Temperature
If fuel injection amount is increased or post-injection is used to increase exhaust gas temperature, then the temperature increases, but a sufficiently high temperature is normally not reached with such a measure alone
Solution Approach 1:
The system changes multiple parameters simultaneously (engine speed, load, injection timing, injection amount) rather than relying solely on increasing fuel injection. This combination of parameter changes achieves higher temperature efficiency than fuel injection alone.
Solution Approach 2:
The control system prepares the engine operating conditions in advance before regeneration is needed, adjusting parameters to build up sufficient exhaust gas temperature and mass flow, ensuring regeneration can proceed effectively when required.
3Temperature
If a separate burner is used for heating up the filter in low-load or idling situations, then the filter can be heated to regeneration temperature, but this is a rather complicated solution requiring additional equipment such as the burner itself and an air compressor
Solution Approach 1:
The engine itself serves to heat the filter for regeneration by controlling its own operating parameters to produce sufficient exhaust gas temperature and mass flow, eliminating the need for external burners and air compressors. The exhaust gas from the engine's normal operation is utilized for the regeneration process.
Solution Approach 2:
The invention extracts and utilizes the heat energy already present in the exhaust gas from the engine's normal operation, rather than adding external heating equipment. The exhaust gas flow itself is harnessed to provide the necessary temperature for regeneration.
4Reliability
If regeneration is attempted with insufficient exhaust gas mass flow, then the filter may be destroyed due to inadequate cooling and heat dissipation
Solution Approach 1:
The control system continuously monitors exhaust gas properties (temperature, mass flow) and uses this feedback to determine when regeneration conditions are met. The controller adjusts engine parameters based on real-time measurements to ensure safe and effective regeneration, preventing filter destruction while maintaining productivity.
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 prevents filter destruction by maintaining sufficient exhaust gas mass flow and temperature, allowing for effective regeneration even in low-load situations, ensuring the regeneration process occurs safely and efficiently.
Implementation Method 1
a purification unit (13) arranged in an internal combustion engine system (1)
Implementation Method 2
To clean such a filter by injecting fuel and burning the particles, the temperature of the exhaust gas leaving the engine should normally be at least around 250°C
Implementation Method 3
burning the particles
Implementation Method 4
The exhaust gas is therefore normally led through an after-treatment system adapted to purify the exhaust gas
Implementation Method 5
if the temperature is too low the desired chemical reactions do not take place or the reaction rate becomes too low, and if the temperature is too high the components might be destroyed
Data Source
Figure 1
Figure 2
AI summary
The invention concerns a method for regenerating an exhaust gas purification unit (13) arranged in an internal combustion engine system (1). The invention is characterized "in that the method comprises the step of setting a predefined minimum engine speed such that the exhaust gas mass flow exceeds a predefined flow value during the regeneration process. The invention also concerns an internal combustion engine system (1 ) comprising an exhaust gas purification unit (13) adapted to be operated according to said method.