Engine Cooling Device with Micelle Coolant Feedback Control
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Solution Overview
Problem
The cooling device for internal combustion engines using a coolant with micelles, which reduces pressure loss but also decreases the heat transfer coefficient, results in insufficient heat transfer from the engine, leading to elevated engine temperatures due to inadequate feedback control mechanisms.
Innovation Solution
A cooling device with an electronic control unit that performs feedback control on the coolant pump based on temperature sensor outputs, micelle determination processing, and correction processing to adjust the coolant flow rate and temperature settings, ensuring the engine operates at a moderate temperature by compensating for the reduced heat transfer coefficient caused by the Toms effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If micelles are added to the coolant to reduce pressure loss, then the power consumption of the coolant pump decreases, but the heat transfer coefficient of the coolant is reduced, causing the engine temperature to increase
Solution Approach 1:
The patent implements feedback control by continuously monitoring the engine temperature through a temperature sensor and adjusting the coolant pump's discharge amount accordingly. When the temperature exceeds the target temperature, the discharge amount is increased; when it is lower than the target temperature, the discharge amount is decreased. This closed-loop feedback mechanism compensates for the reduced heat transfer coefficient caused by micelle addition, maintaining engine temperature within the desired range while enjoying the energy savings from reduced pressure loss.
2Temperature
If the coolant flow rate is increased to compensate for reduced heat transfer coefficient, then the engine temperature can be maintained, but the pressure loss reduction effect of micelles is diminished
Solution Approach 1:
The patent employs dynamic adjustment of the coolant pump's discharge amount based on real-time temperature monitoring. Rather than maintaining a constant high flow rate, the system dynamically optimizes the flow rate according to actual engine temperature conditions. This dynamic control ensures that the coolant flow rate is increased only when necessary to maintain temperature, preserving the pressure loss reduction benefits of micelles while ensuring adequate cooling when needed.
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 maintains the internal combustion engine at a moderate temperature by adjusting the coolant flow rate and temperature settings, ensuring sufficient heat transfer and reducing the risk of overheating, even when the coolant exhibits the Toms effect.
Implementation Method 1
the surfactant is adjusted such that a plurality of rod micelles forms a macrostructure under a predetermined condition. Once the rod micelles form the macrostructure, the turbulent frictional resistance of a fluid is reduced and the pressure loss of the coolant is reduced.
Implementation Method 2
A coolant pump for coolant circulation is provided into the circulation path.
Implementation Method 3
the amount of heat that the coolant receives from the internal combustion engine decreases
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A cooling device for an internal combustion engine (10) includes a circulation path (18), a coolant temperature sensor (12), a coolant pump (26), and an electronic control unit. The electronic control unit is configured to execute processing for performing feedback control on power of the coolant pump (26) such that the output of the coolant temperature sensor (12) becomes a target temperature, micelle determination processing for determining whether or not micelles are added to a coolant based on pump work of the coolant pump (26) and the flow rate of the coolant flowing through the circulation path (18), Toms determination processing for determining whether or not the flow rate of the coolant satisfies a Toms effect expression condition, and correction processing for increasing a relative value of the output of the coolant temperature sensor (12) with respect to the target temperature when the micelles is added and the Toms effect expression condition is established.