Integrated EGR Heat Exchanger Bypass Circuit
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Solution Overview
Problem
Conventional exhaust gas recirculation (EGR) cooling systems in internal combustion engines are space-intensive and costly due to the use of tubing for coolant fluid circulation, increasing engine complexity and procurement costs.
Innovation Solution
An EGR heat exchanger is directly integrated into the coolant fluid circuit, featuring a heat exchange section and a bypass section with a regulable heat exchange opening, allowing for enhanced coolant fluid flow and eliminating the need for external tubes, thereby reducing the system's size and costs while maintaining effective heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tubes are used to connect the coolant fluid circuit to the EGR cooler, then coolant fluid can be supplied to the EGR cooler, but the system takes up a lot of space and requires additional tubing that increases procurement costs and assembly costs
Solution Approach 1:
The EGR cooler is integrated directly into the coolant fluid circuit by forming the coolant fluid passages through the EGR cooler housing itself, merging two separate components (EGR cooler and coolant circuit) into one unified structure. This eliminates the need for external tubing and reduces system complexity while maintaining reliable coolant supply to the EGR cooler.
2Reliability
If tubes are used to connect the coolant fluid circuit to the EGR cooler, then coolant fluid can be supplied to the EGR cooler, but procurement costs and assembly costs increase due to additional tubing requirements
Solution Approach 1:
The EGR cooler is integrated directly into the coolant fluid circuit by forming the coolant fluid passages through the EGR cooler housing itself, merging two separate components (EGR cooler and coolant circuit) into one unified structure. This eliminates the need for external tubing and reduces system complexity while maintaining reliable coolant supply to the EGR cooler.
3Productivity
If the EGR heat exchanger is directly connected to the coolant fluid circuit, then a higher flow of coolant fluid through the EGR heat exchanger is achieved, but the operating temperature needs to be lower
Solution Approach 1:
The EGR heat exchanger is divided into a heat exchange section and a bypass section, with the bypass section allowing excess coolant fluid to flow directly from the coolant circuit back to itself without passing through the heat exchange section. This segmentation enables the system to handle high coolant flow rates while maintaining lower operating temperatures in the heat exchange section, as the bypass section acts as a temperature equalization pathway.
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 configuration lowers the operating temperature of the EGR heat exchanger, reduces NOx emissions and fuel consumption, and allows for a more compact engine design, enabling better space utilization and reduced assembly costs.
Implementation Method 1
At least one exhaust gas passage for allowing exhaust gases to pass through the EGR heat exchanger and at least one coolant fluid passage for allowing coolant fluid to pass through the EGR heat exchanger enables heat transfer to take place between the exhaust gases and the coolant fluid
Implementation Method 2
enables heat transfer to take place between the exhaust gases and the coolant fluid
Data Source
Figure 1
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AI summary
The invention relates to an arrangement (1) for cooling exhaust gases for exhaust gas recirculation (EGR) in an internal combustion engine. The arrangement (1) comprises a coolant fluid circuit (2) comprising a coolant radiator and a coolant fluid pump. The arrangement (1) further comprises an EGR heat exchanger (3) comprising a heat exchanger casing (4). At least one exhaust gas passage (5) for allowing exhaust gases to pass through the EGR heat exchanger (3) and at least one coolant fluid passage (6) for allowing coolant fluid to pass through the EGR heat exchanger (3) allows heat transfer to take place between the exhaust gases and the coolant fluid. The EGR heat exchanger (3) comprises an inlet (7) and an outlet (8) connected to the coolant fluid circuit (2). The EGR heat exchanger (3) further comprises a heat exchange section (9) and a bypass section (10). The heat exchange section (9) comprises the at least one exhaust gas passage (5) and the at least one coolant fluid passage (6). The heat exchange section (9) and the bypass section (10) are in fluid connection with each other through at least one heat exchange opening (11). A predetermined flow of coolant fluid through the heat exchange section (9) is determined by the area of the at least one heat exchange opening (11).