Multi-Engine Exhaust Regeneration via Power Balancing
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Solution Overview
Problem
Regenerating exhaust gas aftertreatment devices in systems with multiple internal combustion engines is challenging due to the need to reduce engine output, which can lead to decreased drive power for common consumers and risk critical component temperature exceedance, especially when operating temperatures are low.
Innovation Solution
The method involves reducing the drive output of one internal combustion engine while increasing the exhaust gas temperature, and offsetting this reduction by increasing the drive output of another engine, either through motor interventions or an external heat source, to maintain constant total drive output and facilitate regeneration without exceeding critical temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the drive output of at least one internal combustion engine is reduced to regenerate the exhaust gas aftertreatment device, then the exhaust gas temperature is increased facilitating regeneration, but the drive power available to common consumers is reduced
Solution Approach 1:
The patent merges the functions of multiple internal combustion engines into a coordinated system where one engine's reduced output is compensated by another engine's increased output, maintaining total drive power while enabling regeneration of the exhaust gas aftertreatment device
Solution Approach 2:
The patent changes the operational parameters of multiple engines simultaneously - reducing output of one engine to increase exhaust gas temperature for regeneration, while increasing output of another engine to compensate for the power loss, thus maintaining system performance
2Temperature
If the drive output of an internal combustion engine is reduced to regenerate the exhaust gas aftertreatment device, then regeneration can occur, but critical component temperatures may be exceeded
Solution Approach 1:
The patent uses another internal combustion engine as an intermediary to compensate for the drive output reduction, allowing the first engine to be reduced for regeneration without causing system-wide temperature problems or loss of drive power
Solution Approach 2:
The patent carefully changes operational parameters by reducing one engine's output for regeneration while increasing another engine's output to maintain overall system temperature within safe limits, preventing critical component temperature exceedance
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 effective regeneration of exhaust gas aftertreatment devices while maintaining constant drive output for consumers, reducing fuel requirements, and minimizing energy consumption by using a small external heat source, thus preventing deactivation and maintaining system efficiency.
Implementation Method 1
an SCR catalytic converter, in which nitrogen oxides are converted into nitrogen and water vapour using a reduction agent such as ammonia
Implementation Method 2
An NO oxidation catalytic converter can be connected upstream of such an SCR catalytic converter, to convert NO into NO2 upstream of the SCR catalytic converter and thereby increase the speed of reaction
Implementation Method 3
an exhaust gas aftertreatment device can also comprise a CH4 oxidation catalytic converter to reduce for example CH4 emissions
Implementation Method 4
the temperature of the exhaust gas of the or each first internal combustion engine increased
Data Source
AI summary
A method for operating a system having a plurality of internal combustion engines coupled together such that then outputs are drawn off by a common load, a downstream individual exhaust gas aftertreatment device, in which the exhaust gas of a particular engine undergoes an individual exhaust gas aftertreatment, positioned downstream of each engine, or a common exhaust gas aftertreatment device, in which the exhaust gas undergoes a common exhaust gas aftertreatment, positioned downstream of to the engine. To regenerate an exhaust gas aftertreatment device, the drive output of one engine is reduced, the temperature of the exhaust gas is increased, and the drive output of a second engine is increased such that the drive output reduction is at least partially compensated for.