Engine Cooling Control Valve Aperture Modulation
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Solution Overview
Problem
In engine cooling systems where coolant circulation is stopped to prevent thermal distortion and pressure buildup, rapid warming of the radiator can occur when coolant is reintroduced, leading to potential damage and inefficiency in warming-up processes.
Innovation Solution
A control valve system that adjusts the aperture ratio of the radiator port based on engine rotational speed and temperature, allowing coolant circulation to resume at lower speeds when the radiator is cooler, thereby reducing thermal distortion and pressure loads on components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the control valve is opened when engine rotational speed becomes equal to or higher than a predetermined speed to prevent pressure buildup, then pressure in the coolant circulation path is reduced, but the radiator is rapidly warmed up causing large thermal distortion
Solution Approach 1:
The control valve aperture ratio is dynamically adjusted based on engine rotational speed and radiator temperature. Instead of a simple on/off control, the system continuously modulates the aperture ratio to match operating conditions, preventing both pressure buildup and thermal distortion by adapting to changing engine speeds and radiator temperatures.
Solution Approach 2:
The system changes the aperture ratio parameter of the control valve based on multiple parameters including engine rotational speed and radiator temperature. By monitoring these parameters and adjusting the aperture ratio accordingly, the system prevents rapid temperature changes in the radiator while maintaining acceptable pressure levels in the coolant circulation path.
2Productivity
If the control valve is kept closed to promote warming-up of the engine, then warming-up efficiency is improved, but pressure in the coolant circulation path rises and large load is applied to pipes
Solution Approach 1:
The control valve aperture ratio is dynamically adjusted based on engine rotational speed and radiator temperature. Instead of a simple on/off control, the system continuously modulates the aperture ratio to match operating conditions, preventing both pressure buildup and thermal distortion by adapting to changing engine speeds and radiator temperatures.
Solution Approach 2:
The system changes the aperture ratio parameter of the control valve based on multiple parameters including engine rotational speed and radiator temperature. By monitoring these parameters and adjusting the aperture ratio accordingly, the system prevents rapid temperature changes in the radiator while maintaining acceptable pressure levels in the coolant circulation path.
3Temperature
If the aperture ratio of the radiator port is increased when the radiator temperature is low, then thermal distortion is reduced, but the discharge amount from the pump must be small to avoid temperature change
Solution Approach 1:
The control valve aperture ratio is dynamically adjusted based on engine rotational speed and radiator temperature. Instead of a simple on/off control, the system continuously modulates the aperture ratio to match operating conditions, preventing both pressure buildup and thermal distortion by adapting to changing engine speeds and radiator temperatures.
Solution Approach 2:
The system uses feedback from temperature sensors to monitor radiator temperature and adjusts the control valve aperture ratio accordingly. When the radiator temperature is low, the system delays opening the valve until the engine reaches a higher rotational speed, using the feedback loop to prevent thermal distortion while managing pump discharge effects.
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 effectively reduces thermal distortion and pressure loads on components by controlling coolant circulation to match the engine's operational conditions, promoting efficient warming-up and protecting the cooling system.
Implementation Method 1
a pump, which is provided in the coolant circulation path and operates in conjunction with rotation of an output shaft of the internal combustion engine
Implementation Method 2
The control valve is configured such that an aperture ratio of the radiator port changes in a range from 0% to 100% by movement of the valve body inside the housing
Implementation Method 3
a radiator, in which circulation of the coolant has been stopped
Implementation Method 4
a water jacket and a radiator of an internal combustion engine
Data Source
AI summary
An engine cooling system includes a coolant circulation path, which circulates coolant between the water jacket and the radiator of an internal combustion engine, a pump, a control valve, which is provided in the coolant circulation path, and a controller. The controller executes a warming-up promotion control and a pressure relaxation control. In the pressure relaxation control, the controller controls the aperture ratio of the radiator port such that the lower the temperature of the radiator, the lower becomes the engine rotational speed at which the aperture ratio of the radiator port is increased.