Engine Cooling Water Jacket Control for Fast Warm-Up and Cooling
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Solution Overview
Problem
Existing engine cooling systems fail to synchronously improve the warming up effect and precise cooling effect, especially in high thermal load conditions, affecting combustion and emission performance.
Innovation Solution
A dual-layer water jacket system with electronically controlled valves and temperature sensors to manage the flow of cooling water, allowing for precise control of communication and disconnection between upper and lower water storage chambers, optimizing warming up and cooling based on temperature feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cooling water flow rate is increased to improve cooling effect, then the cooling efficiency is improved, but the warming up speed at starting stage deteriorates
Solution Approach 1:
The water storage chamber is divided into an upper water storage chamber and a lower water storage chamber, with separate cooling water outlets for each. This segmentation allows independent control of cooling water flow to different engine areas, enabling the system to provide rapid cooling to the cylinder head while maintaining adequate flow to other areas during warming up, thus resolving the contradiction between cooling efficiency and warming up speed
Solution Approach 2:
The patent employs an electronically controlled throttle valve that can dynamically adjust the flow rate of cooling water based on real-time temperature feedback from temperature sensors. This dynamic control allows the system to increase cooling water flow when high cooling efficiency is needed and reduce flow during warming up, thereby resolving the contradiction between these two opposing requirements
2Temperature
If the cooling water flow rate is increased to improve cooling effect under high thermal load, then the cooling effect is improved, but the fuel consumption increases
Solution Approach 1:
The patent implements different cooling water flow rates for different engine components by providing separate outlets from the upper and lower water storage chambers. The upper outlet can provide high flow rate cooling to the cylinder head under high thermal load, while the lower outlet maintains lower flow rate to reduce overall energy consumption, thus resolving the contradiction between cooling effect and fuel consumption through localized quality control
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
Enhances engine warming up speed and cooling efficiency by adjusting water flow rates and directions, improving combustion and emission performance by ensuring optimal temperature management of critical engine components.
Implementation Method 1
the heat taken away by engine cooling water is mainly obtained from the heat exchange between a bottom plate of the cylinder head, an upper area of the cylinder liner and the high-temperature gas in the combustion chamber
Implementation Method 2
a first valve is arranged between the lower water storage chamber of the engine body and the upper water storage chamber of the engine body, and the first valve is configured to control the communication or disconnection
Data Source
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AI summary
The present invention belongs to the technical field of diesel engines, and particularly relates to an engine cooling system and a cooling method therefor. In the engine cooling system of the present invention, when an engine needs to be warmed up, a first valve is opened, a lower engine body water storage chamber is in communication with an upper engine body water storage chamber, and some of the cooling water directly flows into the lower engine body water storage chamber from the upper engine body water storage chamber. The flow of the cooling water entering an engine body is reduced, and under the condition that heat dissipated by the engine is unchanged, the temperature rise of the cooling water flowing through the engine body such as a cylinder sleeve upper cooling water chamber and a cylinder sleeve lower water jacket is faster, such that an engine warming effect is improved. When cooling is needed, a cylinder cover upper water jacket is in communication with the upper engine body water storage chamber, the cooling water no longer cools the upper portion of a cylinder cover and a cylinder cover water storage chamber, the temperature is low, and therefore, the temperature of the cooling water of the cylinder cover upper water jacket can be reduced, such that a cooling effect is improved.