Coolant Temperature Control for Exhaust Regeneration Thermal Overload
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Solution Overview
Problem
The thermal overload of internal combustion engines and cooling systems during the desulfurization of NOx storage catalytic converters and regeneration of particulate filters, especially at low engine loads, leads to excessive thermal output and potential coolant boiling.
Innovation Solution
A method to lower the coolant temperature in the cooling system before and during desulfurization or regeneration processes by increasing the cooling output, using existing components like ambient heat exchangers and coolant pumps, and maintaining a defined pressure level to prevent local boiling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the temperature of exhaust gas is raised to desulfurize the NOx storage catalytic converter and/or to regenerate the particulate filter, then the functionality of the NOx storage catalytic converter and particulate filter is restored, but thermal overload of the internal combustion engine and cooling system occurs leading to potential coolant boiling
Solution Approach 1:
The cooling output is increased in advance before the desulfurization or regeneration process starts. The regulation unit raises the coolant flow rate through the cooling channels of the internal combustion engine before the exhaust gas temperature is elevated, preparing the cooling system to handle the upcoming thermal load and prevent coolant boiling during the thermal management process.
2Temperature
If the cooling output is increased during desulfurization or regeneration, then thermal overload is prevented, but additional energy is consumed by the cooling system
Solution Approach 1:
The cooling output is made dynamically adjustable through the regulation unit, which continuously adapts the coolant flow rate based on the thermal load conditions. During desulfurization or regeneration, the cooling output is increased as needed, and between these processes, the cooling output is reduced to normal levels, optimizing energy consumption while maintaining effective temperature control when required.
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
Prevents thermal overload and coolant boiling, maintaining optimal engine operation by adjusting coolant temperature and pressure, thus extending component lifespan and ensuring efficient heat management.
Implementation Method 1
a coolant is pumped through at least one cooling circuit... said coolant picks up thermal energy from components that are integrated into the cooling circuit
Implementation Method 2
this thermal energy is subsequently released into the ambient air in an ambient heat exchanger, the so-called main cooler
Implementation Method 3
an (EGR) cooler to be integrated into the exhaust gas recirculation line, whereby said cooler, as a heat exchanger, allows thermal energy from the exhaust gas that is to be recirculated to be transferred to a coolant
Implementation Method 4
the cooling output for the coolant flowing through the cooling system is purposefully increased... by increasing the coolant flow rate through the cooling channels of the internal combustion engine
Data Source
AI summary
A thermal overload of an internal combustion engine and of cooling system of a combustion machine due to a raising of the temperature of the exhaust gas flowing through an exhaust gas line of the combustion machine, which is provided as a measure to desulfurize a NOx storage catalytic converter and/or to regenerate a particulate filter, is prevented in that before and/or during this measure, the cooling output for the coolant flowing through the cooling system is systematically increased in order to achieve a lowering of the coolant temperature to a value range that lies below what would normally—that is to say, without the simultaneous desulfurization of the NOx storage catalytic converter and/or without the regeneration of the particulate filter—have been provided for the operation of the combustion machine in a corresponding operating state of the internal combustion engine.