Segmented Engine Cooling Circuit for Head Temperature and Warm-Up Trade-Off
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Solution Overview
Problem
High-performance internal combustion engines experience excessive head temperatures during sporty use and slow warm-up times, leading to increased fuel consumption and component degradation due to inefficient liquid cooling systems.
Innovation Solution
A liquid cooling system with a hydraulic circuit design that includes parallel initial sections in the engine heads and series final sections in the cylinder blocks, along with a circulation pump, heat exchangers, and shut-off valves to manage coolant flow, prioritizing cooling of the engine heads during high-power conditions and conserving heat for warm-up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional liquid cooling system is used in high-performance internal combustion engines, then cooling capacity is provided, but head temperatures become excessively high during sporty use and warm-up time is prolonged during normal use
Solution Approach 1:
The cooling system is segmented into two independent circuits: a first circuit with a first pump for cooling the heads, and a second circuit with a second pump for cooling the cylinder blocks. This segmentation allows independent control of coolant flow to different engine sections, enabling optimized cooling for heads during high-power operation while maintaining efficient warm-up for the entire engine during normal operation.
Solution Approach 2:
The system employs dynamic control through electronically controllable shut-off valves (first and second valves) that can independently regulate or block coolant flow to the head cooling circuit or block cooling circuit. This dynamic adjustment allows the system to adapt to varying operational conditions, providing maximum cooling to heads during sporty use and efficient heat distribution during warm-up phases.
2Reliability
If excessive head temperatures occur during sporty use, then component degradation accelerates, but increasing cooling capacity prolongs warm-up time and increases fuel consumption
Solution Approach 1:
By dividing the cooling system into separate head cooling and block cooling circuits with independent pumps and valves, the system can apply cooling capacity selectively. During sporty use, full cooling capacity is directed to heads to protect components, while during normal operation, reduced or selective cooling maintains fuel efficiency and accelerates warm-up.
Solution Approach 2:
The system changes operational parameters dynamically by adjusting pump speeds, valve positions, and coolant flow rates based on engine load and temperature conditions. This allows optimization of the balance between component protection and fuel consumption across different operating regimes.
3Adaptability or versatility
If a single cooling circuit is used, then system simplicity is maintained, but the system cannot independently optimize cooling for different engine sections under varying load conditions
Solution Approach 1:
The cooling system is divided into functionally independent head cooling and block cooling circuits, each with its own pump and control valve. This segmentation provides the adaptability to independently optimize cooling for different engine sections while maintaining a modular structure that is manageable and maintainable.
Solution Approach 2:
Both the first and second pumps can potentially serve dual purposes by directing coolant to either the head circuit or block circuit depending on operational requirements. The shut-off valves enable each pump to be universally applicable to different cooling needs, increasing system versatility without proportionally increasing complexity.
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 reduces fuel consumption and emissions during warm-up, maintains acceptable head temperatures during sporty use, and is cost-effective with simple implementation.
Implementation Method 1
a circulation pump, to which a delivery of the circulation pump is directly connected to an inlet of each initial section (19)
Implementation Method 2
a radiator, in which the coolant releases heat to the external environment
Implementation Method 3
the hydraulic circuit comprises labyrinths obtained in the cylinder block and the head of the internal combustion engine
Data Source
AI summary
A vehicle having: an internal combustion engine provided with a plurality of cylinders, at least one cylinder block, in which the cylinders are located, and at least one head, which is fixed to the cylinder block, and a liquid cooling system, comprising a hydraulic circuit, inside of which a coolant flows, which is circulated by a circulation pump. The hydraulic circuit has an initial section, which is located inside the head of the internal combustion engine, and a final section, which is obtained inside the cylinder block of the internal combustion engine. In the hydraulic circuit, the delivery of the circulation pump is directly connected to the inlet of the initial section, and the outlet of the initial section is directly connected to the inlet of the final section.