Engine Cooling Device with Dual Circuits for Cylinder Head and Block
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Solution Overview
Problem
Internal combustion engines face challenges in individually controlling the temperatures of the cylinder head and cylinder block, leading to issues such as abnormal combustion, reduced fuel economy, and increased friction during idle reduction, which affects startup performance.
Innovation Solution
A cooling device with multiple cooling liquid lines, an electric flow rate control valve, a bypass line, a mechanical water pump, and an electric water pump, allowing for independent temperature control of the cylinder head and cylinder block through a control method that detects temporary engine stops and adjusts the flow rate of cooling liquid accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cooling liquid flow rate to the cylinder head is increased during temporary stop, then the temperature rise is reduced and abnormal combustion is prevented, but the temperature of the cylinder block drops and friction increases
Solution Approach 1:
The cooling system is divided into two independent circuits: a first cooling liquid line for the cylinder head and a second cooling liquid line for the cylinder block. This segmentation allows independent temperature control of each component, enabling the cylinder head to be cooled during temporary stop while maintaining the cylinder block temperature to prevent friction increase.
Solution Approach 2:
An electric flow rate control valve dynamically adjusts the cooling liquid flow rates to each circuit based on real-time operating conditions. During temporary stop, the valve increases flow to the cylinder head while maintaining adequate flow to the cylinder block, adapting the cooling distribution to prevent both abnormal combustion and excessive friction.
2Temperature
If the temperature of the cylinder head is quickly increased during warm-up, then combustibility and fuel economy are improved, but the temperature control precision is reduced
Solution Approach 1:
The electric flow rate control valve provides dynamic adjustment of cooling liquid flow during warm-up operation. The system可以快速 increase cylinder head temperature by controlling the valve opening, then precisely maintains the target temperature through continuous feedback control, achieving both rapid warm-up and precise temperature control.
Solution Approach 2:
The control system monitors the cylinder head temperature in real-time and adjusts the electric flow rate control valve based on the temperature deviation from the target value. This feedback mechanism enables precise temperature control during warm-up, preventing both insufficient heating and excessive temperature rise.
3Device complexity
If a single cooling circuit is used, then the device complexity is reduced, but the ability to individually control temperatures of cylinder head and cylinder block is lost
Solution Approach 1:
The cooling system is segmented into two separate circuits with independent flow control. The first cooling liquid line serves the cylinder head while the second cooling liquid line serves the cylinder block. This segmentation enables independent temperature control of each component without requiring an overly complex multi-circuit system.
4Reliability
If the electric water pump is activated during temporary stop, then the cooling liquid continues to circulate and abnormal combustion is prevented, but the energy consumption increases
Solution Approach 1:
Instead of circulating cooling liquid through the entire cooling system during temporary stop, the system activates the electric water pump only when necessary to maintain adequate cooling, and uses the electric flow rate control valve to direct cooling liquid only to the cylinder head circuit. This partial action approach prevents abnormal combustion while minimizing energy consumption by avoiding unnecessary circulation through the cylinder block circuit.
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 solution improves temperature controllability, enhancing fuel economy and startup performance by preventing abnormal combustion and reducing friction, while maintaining optimal engine conditions during temporary stops and restarts.
Implementation Method 1
a mechanical water pump that circulates the cooling liquid
Implementation Method 2
an electric water pump that circulates the cooling liquid
Implementation Method 3
a first cooling liquid line that routes the cooling liquid by way of a radiator and a cylinder head of the internal combustion engine
Implementation Method 4
a second cooling liquid line that routes the cooling liquid by way of the cylinder block
Data Source
AI summary
The present invention relates to a cooling device and a control method therefor. This cooling device includes: a first cooling liquid line routed by way of a cylinder head and a radiator; a second cooling liquid line routed by way of a cylinder block while bypassing the radiator; a third cooling liquid line routed by way of the cylinder head and a heater core while bypassing the radiator; a flow rate control valve for distributing cooling water to the cooling liquid lines; and mechanical and electric water pumps. A control unit controls the flow rate control valve according to the temperatures of the cylinder head and block, during engine operation, and causes the electric water pump to operate while controlling the flow rate control valve according to the temperature of the cylinder head, and whether or not heat exchange in the heater core is requested, during temporary engine stop.