Dynamic Coolant Pump Speed Control for Engine Thermal Management
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Solution Overview
Problem
Existing engine coolant control systems fail to provide sufficient cooling when heat input to the engine increases rapidly, leading to potential coolant boiling and reduced engine longevity.
Innovation Solution
A coolant control system that dynamically adjusts the coolant flowrate based on changes in heat input to the engine, increasing the flowrate when heat input exceeds a predetermined value to prevent boiling and maintain optimal cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If coolant flowrate is increased to prevent boiling during rapid heat input increases, then cooling effectiveness is improved, but system complexity increases due to dynamic control requirements
Solution Approach 1:
The coolant pump operates in multiple discrete speed modes (first, second, and third speeds) rather than a fixed speed, allowing the system to dynamically adapt coolant flowrate to match varying thermal demands. The controller switches between these speeds based on real-time thermal conditions, particularly when heat input exceeds predetermined thresholds, thereby preventing coolant boiling while managing system complexity through discrete rather than continuous control.
Solution Approach 2:
The system incorporates thermal sensors that continuously monitor engine and coolant temperatures, feeding this information back to the controller. When the controller detects that heat input to the engine exceeds a predetermined value or that coolant temperature approaches boiling points, it automatically increases the pump speed to the second or third speed, ensuring adequate cooling while maintaining simple control logic based on threshold-based feedback.
2Temperature
If coolant flowrate is increased during rapid heat input, then cooling effectiveness is improved, but energy consumption increases
Solution Approach 1:
The coolant pump operates in multiple discrete speed modes (first, second, and third speeds) rather than a fixed speed, allowing the system to dynamically adapt coolant flowrate to match varying thermal demands. The controller switches between these speeds based on real-time thermal conditions, particularly when heat input exceeds predetermined thresholds, thereby preventing coolant boiling while managing system complexity through discrete rather than continuous control.
Solution Approach 2:
The system changes the operational parameters of the coolant pump by switching between discrete speed levels (first, second, third speeds) based on thermal conditions. When heat input is low, the pump operates at first speed consuming less energy. When heat input exceeds predetermined values or coolant temperature approaches critical levels, the controller switches to second or third speed to increase cooling effectiveness, thereby optimizing the balance between energy consumption and cooling performance.
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 system effectively prevents coolant boiling and ensures sufficient cooling during rapid heat increases, thereby extending engine lifespan and maintaining fuel efficiency.
Implementation Method 1
Engine coolant circulates through the coolant channels and the radiator. The engine coolant absorbs heat from the engine and carries the heat to the radiator.
Implementation Method 2
The radiator transfers heat from the engine coolant to air passing the radiator.
Data Source
AI summary
A coolant control system of a vehicle includes first and second target flowrate modules, a target speed module, and a speed control module. The first target flowrate module determines a first target flowrate of coolant through an engine. The second target flowrate module, when a change in heat input to the engine is greater than a predetermined value, sets a second target flowrate to greater than the first target flowrate. The target speed module determines a target speed of an engine coolant pump based on the second target flowrate. The speed control module controls a speed of the engine coolant pump based on the target speed.