Engine Cooling Device with Dynamic Intake Air Temperature Control
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Solution Overview
Problem
Existing cooling devices for internal combustion engines with two cooling water circulating systems face challenges in preventing knocking, port wetting, and unstable combustion due to insufficient or excessive cooling, as the temperature of low temperature cooling water and high temperature cooling water interact to affect intake air temperature.
Innovation Solution
A cooling device with two cooling water circulating systems, where a controller adjusts the temperature of the second cooling water circulating system based on the load and engine speed of the internal combustion engine, setting the temperature of the second cooling water lower in specific operational regions to prevent knocking and higher in other regions to prevent port wetting and unstable combustion, while also considering the temperature of the first cooling water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the temperature of the second cooling water circulating system is reduced to cool intake air and prevent knocking, then knocking prevention is improved, but port wetting and unstable combustion occur due to excessive cooling
Solution Approach 1:
The patent applies dynamic control by adjusting the temperature of the second cooling water circulating system based on real-time detection of engine operating conditions. The controller dynamically changes the temperature setting to match the actual engine state, preventing both over-cooling (which causes port wetting) and under-cooling (which causes knocking).
Solution Approach 2:
The patent implements feedback control where the controller detects engine operating conditions (such as load, speed, and temperature) and uses this information to adjust the temperature of the second cooling water circulating system. This closed-loop feedback ensures optimal cooling that prevents both knocking and port wetting by continuously monitoring and responding to engine state changes.
2Object-generated harmful factors
If the temperature of the second cooling water circulating system is increased to prevent port wetting and unstable combustion, then port wetting is reduced, but knocking occurs due to insufficient cooling of intake air
Solution Approach 1:
The system dynamically adjusts the temperature of the second cooling water circulating system based on detected engine operating conditions. When the engine operates in conditions prone to knocking (such as high load), the controller reduces the temperature to enhance cooling. When conditions indicate risk of port wetting, the controller increases the temperature, thus dynamically balancing both requirements.
Solution Approach 2:
The feedback control mechanism allows the controller to monitor engine operating conditions and adjust the second cooling water temperature accordingly. The system responds to detected conditions by modulating the cooling intensity, ensuring sufficient cooling to prevent knocking while avoiding excessive cooling that would cause port wetting.
3Device complexity
If a single cooling water circulating system is used to cool the entire engine, then device complexity is reduced, but the temperature of intake air cannot be optimally controlled to prevent knocking
Solution Approach 1:
The patent divides the cooling system into two separate circulating systems: a first cooling water circulating system for general engine cooling and a second cooling water circulating system specifically for intake air cooling. This segmentation allows independent temperature control of each system, enabling optimal cooling of the intake air to prevent knocking without compromising overall engine cooling efficiency.
Solution Approach 2:
The second cooling water circulating system is dedicated to providing localized cooling to the intake air and intake port area, while the first system handles the rest of the engine. This local quality approach allows the intake air to be cooled to temperatures specifically suitable for preventing knocking, while other engine components receive appropriate cooling from the first system.
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 cooling device effectively prevents knocking by cooling intake air and avoids port wetting and unstable combustion by dynamically adjusting the temperature of the second cooling water circulating system, ensuring optimal cooling based on the engine's operational conditions.
Implementation Method 1
intake air cooler of a water cooling type that cools an intake air
Implementation Method 2
a cooling water flow channel formed in a cylinder head and a cylinder block
Data Source
AI summary
High temperature (HT) and low temperature (LT) cooling water, the LT cooling water being at a lower temperature than the HT cooling water, circulate in HT and LT cooling water flows in respective channels. A controller controls to set the temperature of the LT cooling water lower in a case where an operating point of an engine lies in a particular region in an operational region of the engine, the particular region including a region in which the load is high and the engine speed is low, than in a case where the operating point lies in an operational region other than the particular region. Furthermore, the controller narrows the particular region in a direction toward higher loads in a case where the temperature of the HT cooling water is lower than a predetermined temperature.