Diesel Engine Regeneration for Transport Refrigeration Soot Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Diesel engines in transport refrigeration machines are prone to sooting when operated at low loads for extended periods, leading to performance impairment and potential lasting damage due to soot deposits on engine components.
Innovation Solution
A method that involves recording the time profile of operating parameters such as operating time, load, and temperature, and applying an additional load to the diesel engine during a regeneration interval to increase its operating temperature, thereby burning off soot deposits and minimizing the risk of soot formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the diesel engine is operated at low load for extended periods to maintain target temperature and speed range, then energy efficiency is improved, but soot deposits form on engine components
Solution Approach 1:
The patent implements periodic regeneration intervals during which the diesel engine is subjected to additional load to burn off soot deposits. This periodic high-load operation is interspersed with normal low-load operation, creating a cyclical pattern that maintains energy efficiency while periodically eliminating harmful soot accumulations through controlled high-temperature combustion events.
2Object-generated harmful factors
If additional load is applied to the diesel engine during regeneration interval to burn off soot, then soot deposits are removed, but energy consumption increases
Solution Approach 1:
The patent maintains continuous temperature control of the cargo space while implementing the regeneration process. The first temperature control device continues to operate throughout the regeneration interval, ensuring that the cargo space temperature remains within the target range even during the high-load regeneration period. This continuity ensures that the additional energy consumption is dedicated solely to the regeneration process rather than compromising the primary cooling function.
3Object-generated harmful factors
If the diesel engine speed is controlled to maintain target speed range, then emission performance is optimized, but the engine cannot reach high temperatures needed for soot combustion
Solution Approach 1:
The patent dynamically adjusts the diesel engine operating conditions based on the operational phase. During normal operation, the engine speed is controlled within a target range to optimize emission performance and energy efficiency. During regeneration intervals, the engine speed and load are dynamically increased to generate the high temperatures necessary for soot combustion, then returned to the target range afterward. This dynamic adjustment allows the engine to alternately optimize for emissions and for soot removal.
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 effectively burns off existing soot deposits, improving engine performance and reducing the risk of soot-related damage by maintaining higher operating temperatures during regeneration intervals.
Implementation Method 1
applying an additional load to the diesel engine during a regeneration interval to increase its operating temperature, thereby burning off soot deposits
Data Source
Figure 1
Figure 2
Figure 3a
AI summary
The invention relates to a method for operating a transport refrigeration unit (1, 101, 201) attached to a commercial vehicle, which tempers a cargo space atmosphere contained in a cargo space of the commercial vehicle by passing a current (VA) of the cargo space atmosphere through the transport refrigeration unit (1, 101, 201) and thereby passing through a first tempering device (8, 108, 208) in which the current (VA) of the cargo space atmosphere is cooled or heated, wherein the actual temperature in the cargo space is detected and the first tempering device (8, 108, 208) is driven by a diesel engine (2, 102, 202), the power delivered to the first tempering device (8, 108, 208) is regulated such that the detected actual temperature in the cargo space is within a target temperature range and the speed of the diesel engine (2, 102, 202) is within a target speed range.To minimize the risk of lasting damage and loss of engine performance due to soot buildup, the invention proposes that the temporal profile of at least one of the operating parameters or operating events "end of a predetermined operating time interval, operating duration, operating load, operating temperature, fuel consumption, exhaust gas temperature, exhaust gas composition" of the diesel engine (2,102,202) is recorded and, upon reaching a predetermined limit value for the operating parameter in question or upon the occurrence of the operating event in question, the diesel engine (2,102,202) is subjected to an additional load over a regeneration interval.