Vehicle Engine Cooling Device Bypass Flow Control
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Solution Overview
Problem
In internal combustion engine cooling devices, low external air temperatures hinder the heating performance of heat exchangers, leading to lower oil and air temperatures, increased friction, and poor fuel economy, while increasing cooling water temperature risks abnormal combustion.
Innovation Solution
The cooling device increases the circulation flow rate and temperature of cooling water during low external air temperatures by adjusting the flow rate control valve and electric water pump discharge flow rate, optimizing heat exchange without excessively raising the cooling water temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cooling water temperature is increased to improve heat exchanger heating performance, then the temperature of oil and air passing through heat exchangers increases, but the likelihood of abnormal combustion such as knocking increases
Solution Approach 1:
The invention changes the operating parameters of the cooling water system by increasing both the temperature and circulation flow rate. This dual parameter adjustment allows the system to deliver more thermal energy to heat exchangers while the increased flow rate prevents excessive temperature buildup in the engine, thereby reducing abnormal combustion risk.
Solution Approach 2:
The invention dynamically adjusts the cooling water circulation flow rate based on external air temperature conditions. During low external air temperature states, the system increases the circulation flow rate to optimize heat delivery while maintaining safe operating temperatures, creating a dynamic balance between heating performance and combustion stability.
2Temperature
If the cooling water temperature is increased to improve heating performance of heat exchangers, then the heating performance improves, but the fuel economy deteriorates due to increased friction
Solution Approach 1:
The invention optimizes fuel economy by adjusting the circulation flow rate parameter in addition to temperature. The increased flow rate ensures efficient heat transfer to lubricating oil and hydraulic oil, reducing friction losses and improving overall system efficiency, which compensates for the energy used to circulate the cooling water.
Solution Approach 2:
The invention maintains continuous optimization of heat transfer by keeping the cooling water circulation system actively engaged. The increased circulation flow rate ensures continuous heat delivery to heat exchangers, maintaining optimal temperatures for reducing friction and improving fuel economy throughout operation.
3Object-affected harmful factors
If the cooling water circulation flow rate is increased to prevent abnormal combustion, then the cooling effect improves, but the heating performance of heat exchangers deteriorates
Solution Approach 1:
The invention simultaneously changes two parameters: temperature and circulation flow rate. The increased circulation flow rate provides a cooling effect that prevents abnormal combustion, while the increased temperature ensures sufficient heat delivery to exchangers. The synergistic effect of both parameter changes resolves the contradiction between cooling and heating functions.
4Loss of time
If the cooling water temperature is increased to improve engine warm-up performance, then the warm-up performance improves, but the risk of abnormal combustion increases
Solution Approach 1:
The invention dynamically balances warm-up performance and combustion stability by adjusting the circulation flow rate in real-time. During the warm-up phase, the increased flow rate accelerates heat distribution throughout the engine, while the controlled temperature increase ensures rapid warm-up without triggering abnormal combustion, adapting to changing thermal conditions.
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 approach enhances heat radiation, reduces friction, and improves fuel economy while preventing abnormal combustion by maintaining optimal cooling water temperatures.
Implementation Method 1
A cooling water circulation passage in a cooling device of an internal combustion engine for vehicle may include heat exchangers for heating
Implementation Method 2
electric water pump for circulating cooling water
Implementation Method 3
flow rate control valve for controlling a flow rate of the cooling water circulating through the bypass line
Implementation Method 4
electric water pump for circulating cooling water
Implementation Method 5
increasing a temperature of the cooling water during a low external air temperature state
Data Source
AI summary
The present invention relates to a cooling device of internal combustion engine for vehicle and a control method thereof. The cooling device according to the present invention includes: an electric water pump; a bypass line bypassing a radiator; and a flow rate control valve for controlling a flow rate of cooling water circulating through the bypass line. During a low external air temperature state where the external air temperature is below a threshold, the cooling device increases the temperature of the cooling water by increasing the flow rate of the cooling water circulating through the bypass line as compared to during a high external air temperature state where the external air temperature is above the threshold, and increases a circulation flow rate of the cooling water by increasing a discharge flow rate of the electric water pump as compared to during the high external air temperature state.