Electric Water Pump Control for Engine Thermal Management
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Solution Overview
Problem
Current electric water pumps in vehicles operate continuously, leading to decreased fuel efficiency, increased friction loss, and prolonged engine warm-up times, especially when the engine is cold, resulting in higher fuel consumption and poorer exhaust gas quality.
Innovation Solution
An electric water pump control apparatus that actively controls the electric water pump based on engine speed, fuel consumption, and coolant temperature, using a thermostat, radiator, coolant temperature sensor, and control portion to optimize coolant circulation, reducing power loss and improving fuel efficiency by varying the pump's speed and operation time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the water pump operates continuously to circulate coolant, then the engine is kept cool, but fuel efficiency decreases and friction loss increases
Solution Approach 1:
The water pump operates with variable speed controlled by a controller that adjusts the pump speed based on real-time detection of engine operating conditions (temperature, load, speed). The pump transitions from continuous fixed-speed operation to dynamic variable-speed operation, matching coolant circulation needs to actual engine thermal requirements, thereby reducing unnecessary energy consumption while maintaining adequate cooling.
Solution Approach 2:
The system changes the operating parameters of the water pump by adjusting its rotation speed according to detected engine conditions. The controller modifies pump speed parameters based on coolant temperature, engine load, and operating speed, allowing the pump to operate at optimal speeds for different conditions rather than maintaining constant high-speed operation.
2Temperature
If the water pump operates continuously, then cooling is maintained, but engine warm-up time is prolonged
Solution Approach 1:
The pump's variable speed operation allows it to provide high coolant circulation during cold engine conditions to accelerate warm-up, then automatically reduce speed when the engine reaches operating temperature. This dynamic adjustment shortens warm-up time compared to continuous operation while maintaining adequate cooling when needed.
Solution Approach 2:
The controller implements periodic monitoring of engine conditions and adjusts pump operation accordingly, creating a cyclic control pattern that optimizes both warm-up and cooling phases. The system periodically transitions between high-speed pump operation (for warm-up) and variable-speed operation (for cooling), improving overall thermal management efficiency.
3Productivity
If the water pump operates at high speed, then cooling efficiency is improved, but power loss increases
Solution Approach 1:
The system dynamically adjusts pump speed based on actual cooling requirements rather than maintaining constant high-speed operation. The controller monitors engine temperature, load, and speed to determine the optimal pump speed that provides sufficient cooling efficiency while minimizing power loss, creating a balance between cooling performance and energy consumption.
Solution Approach 2:
The pump operating parameters (speed) are continuously adjusted based on detected engine conditions. The controller modifies pump speed parameters to match the actual thermal management needs, providing high cooling efficiency when the engine requires it while reducing speed (and power loss) when cooling demand is lower.
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 solution enhances engine cooling efficiency, reduces fuel consumption, minimizes abrasion, and improves exhaust gas quality by dynamically adjusting the electric water pump's operation according to driving and atmospheric conditions, thereby reducing engine warm-up time and catalyst activation time.
Implementation Method 1
a radiator that emits absorbed heat to atmosphere by expanding contact area of the coolant with air through core
Implementation Method 2
a water pump circulates a coolant through the coolant passage so as to prevent overheating of the engine
Data Source
AI summary
An electric water pump control apparatus actively controls an electric water pump in a high speed range or a high load condition as a vehicle accelerates or overtakes. An electric water pump control method may include determining whether an engine is in a high speed/high load condition or in a normal condition by detecting an engine speed, fuel consumption amount, and coolant temperature, determining whether the coolant temperature is less than a predetermined second temperature, if the engine is in a high speed/high load condition, calculating a speed of the electric water pump by applying fuel consumption amount and engine speed, if the coolant temperature is less than a second temperature and determining a final speed of the electric water pump by applying a compensation coefficient according to the coolant temperature, and operating the electric water pump with the final speed to circulate the coolant.