Cylinder Head Cooling via Transverse Coolant Flow
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Solution Overview
Problem
Cylinder heads with integrated exhaust manifolds face thermal overloading due to insufficient cooling, leading to potential material melting and increased fuel consumption when enriching the fuel-air mixture to lower exhaust gas temperatures.
Innovation Solution
A cylinder head design with a coolant jacket and additional connections between the lower and upper coolant jackets, allowing coolant flow transversely to enhance cooling, particularly in regions where exhaust gas lines merge, thereby reducing thermal loading and eliminating the need for fuel enrichment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If exhaust-gas lines are integrated into the cylinder head to reduce thermal inertia, then the response time of the exhaust-gas turbocharger is improved, but the cylinder head becomes thermally overloaded
Solution Approach 1:
The coolant jacket is divided into multiple separate coolant chambers (first, second, third, and fourth coolant chambers) arranged at different locations within the cylinder head. This segmentation allows targeted cooling of specific thermally loaded regions, particularly around the integrated exhaust-gas lines, without requiring a complete redesign of the cooling system.
Solution Approach 2:
Different regions of the cylinder head are provided with different cooling characteristics through the strategically positioned coolant chambers. The chambers are located to provide intensive cooling where thermal loading is highest (around the exhaust-gas line integration points) while maintaining overall thermal balance in the cylinder head.
2Temperature
If coolant jackets are added to cool the cylinder head, then thermal loading is reduced, but the structural strength of the cylinder head is weakened
Solution Approach 1:
The coolant chambers are nested within the existing cylinder head structure, utilizing the internal space efficiently. The coolant chambers are formed as cavities within the cylinder head material itself, allowing cooling functionality to be integrated without adding external components that would compromise structural integrity.
3Temperature
If the fuel-air mixture is enriched to lower exhaust gas temperatures, then thermal overloading is prevented, but fuel consumption increases
Solution Approach 1:
The patent converts the harmful thermal energy from exhaust gases into a beneficial cooling effect. The hot exhaust gases flowing through the integrated exhaust-gas lines directly adjacent to the coolant chambers provide passive cooling to the cylinder head, reducing the need for fuel enrichment and thereby reducing fuel consumption while maintaining thermal management.
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 design provides effective cooling, reducing thermal overloading and improving fuel efficiency and emissions by allowing direct heat dissipation from the cylinder head's outer wall, while maintaining mechanical strength and enabling efficient operation of supercharged engines.
Implementation Method 1
liquid cooling requires the internal combustion engine or the cylinder head to be equipped with a coolant jacket, that is to say the arrangement of coolant ducts which conduct the coolant through the cylinder head
Implementation Method 2
The heat which is dissipated to the coolant is in this way discharged from the interior of the cylinder head and extracted from the coolant again in a heat exchanger
Data Source
AI summary
A cylinder head for an internal combustion engine has at least two cylinders, each cylinder having an outlet opening for discharging the exhaust gases out of the cylinder, an assembly end side for connection to a cylinder block of the engine, an exhaust-gas line adjoining each outlet opening, the exhaust-gas lines of the at least two cylinders merging within the cylinder head to form a combined exhaust-gas line, and a coolant jacket interior to and at least partially integrated in the cylinder head, the coolant jacket made up of a lower coolant jacket and an upper coolant jacket, and at least one connection between the lower coolant jacket and the upper coolant jacket immediately adjacent the combined exhaust-gas line for allowing the passage of coolant.