Engine Cooling Device with Dynamic Flow Path Switching
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Solution Overview
Problem
Conventional engine cooling systems face challenges in reducing cooling loss while maintaining heat efficiency, as they cannot partially change the heat transfer state based on engine driving conditions, leading to increased risk of knocking due to elevated combustion chamber temperatures.
Innovation Solution
An engine cooling device with a cooling medium flow passage system that branches into multiple paths within the cylinder block and cylinder head, featuring a flow changing portion that adjusts coolant flow rate based on cylinder head temperature or pressure, allowing for partial heat transfer state changes to reduce cooling loss and prevent knocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the flow rate of coolant is increased to cool the cylinder head, then the cylinder head temperature is reduced, but the cooling loss increases and heat efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the cooling system adjustable rather than fixed. The flow rate of coolant to the cylinder head is dynamically changed based on engine operating conditions (cold state vs. warm state). In cold state, coolant flows through cylinder head first for rapid warming. In warm state, the flow path is switched to flow through radiator first, then cylinder head, enabling temperature-dependent optimization of cooling loss.
Solution Approach 2:
The patent changes the parameter of coolant flow rate and flow path based on engine temperature state. By switching between different flow configurations (cylinder head first vs. radiator first), the system optimizes the balance between cylinder head cooling and overall cooling loss, thereby improving heat efficiency while maintaining necessary temperature control.
2Loss of energy
If heat insulation is increased to reduce cooling loss, then heat efficiency improves, but the inner wall temperature of combustion chamber increases causing knocking
Solution Approach 1:
The patent dynamically adjusts the cooling intensity to the cylinder head based on engine operating state. During warm operation, the system switches to a flow path that provides adequate cooling to prevent knocking while minimizing unnecessary cooling loss. This dynamic adjustment allows the system to maintain the optimal balance between heat insulation benefits and knocking prevention.
Solution Approach 2:
The patent changes the coolant flow configuration parameter based on engine temperature. By switching between different flow paths (direct to cylinder head vs. through radiator first), the system optimizes the cooling effect to prevent knocking while minimizing cooling loss, thereby improving heat efficiency without causing harmful knocking effects.
3Productivity
If a mechanical water pump is used to change coolant flow rate based on engine rotational speed, then the flow rate is adjusted, but the heat transfer state cannot be partially changed based on engine driving state
Solution Approach 1:
The patent segments the cooling system into separate controllable paths: one path for rapid cooling (cylinder head first) and another path for optimized cooling loss (radiator first). This segmentation allows independent control of cooling intensity for different engine states, enabling partial heat transfer state changes that a single unified pump system cannot achieve.
Solution Approach 2:
The patent changes the flow path configuration parameter based on engine driving state rather than just rotational speed. By switching between different flow configurations (cold state path vs. warm state path), the system achieves adaptability to various engine conditions, allowing optimal heat transfer control that responds to actual thermal needs rather than just mechanical speed parameters.
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
The system effectively reduces cooling loss and minimizes the risk of knocking by dynamically adjusting coolant flow rates in response to engine conditions, enhancing overall heat efficiency and engine reliability.
Implementation Method 1
a cooling medium flow passage which is a single system as a whole and which causes a cooling medium to flow from the cylinder block to the cylinder head
Implementation Method 2
the flow changing portion increases a flow rate of the cooling medium, when the temperature of the cylinder head is higher than a first predetermined temperature
Data Source
AI summary
The cooling device is provided with an engine including a cylinder block, a cylinder head, and a W/J which is a single system as a whole and which causes coolant to flow from the cylinder block to the cylinder head. The W/J branches into first and second inner paths within the cylinder block, and joints together within the cylinder head. The first inner path is provided with an opening and closing valve for permitting and prohibiting the flow of the coolant based on the pressure of the coolant.