Engine Coolant Flow Control During Cold Start
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Solution Overview
Problem
Existing cooling systems for internal combustion engines face challenges in efficiently managing coolant flow during startup, leading to inaccurate temperature prediction models that can result in coolant boiling and engine erosion, while also affecting fuel efficiency as coolant flow rates increase.
Innovation Solution
A system comprising a startup module, load module, and peak estimation module that controls coolant flow by receiving temperature and load signals to determine when to circulate coolant at a minimum flow rate during engine startup, thereby maintaining high fuel efficiency and preventing excessive thermal energy removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If coolant flow rate is increased during engine startup, then engine temperature control is improved, but fuel efficiency deteriorates
Solution Approach 1:
The pump speed is dynamically adjusted based on real-time temperature measurements and engine operating conditions. The controller continuously monitors engine temperature and modifies coolant flow rate accordingly, transitioning from high flow during cold startup to reduced flow as temperature increases, optimizing both temperature control and fuel efficiency throughout the warm-up process
Solution Approach 2:
The system changes the coolant flow rate parameter in response to temperature conditions. During cold startup, high flow rate is maintained to prevent overheating, while as the engine warms up, the flow rate is reduced to minimize thermal energy removal and maximize fuel efficiency, with the controller adjusting this parameter based on temperature sensor feedback
2Use of energy by moving object
If coolant flow rate is reduced during engine startup, then fuel efficiency is improved, but temperature control capability deteriorates
Solution Approach 1:
The system employs feedback control where temperature sensors continuously monitor engine temperature and provide signals to the controller. The controller uses this feedback to adjust pump speed and coolant flow rate in real-time, ensuring temperature remains within optimal ranges while maximizing fuel efficiency during different phases of engine operation
Solution Approach 2:
The coolant flow rate is dynamically adjusted based on real-time temperature measurements and engine operating conditions. The controller continuously monitors engine temperature and modifies coolant flow rate accordingly, transitioning from high flow during cold startup to reduced flow as temperature increases, optimizing both temperature control and fuel efficiency throughout the warm-up process
3Speed
If pump speed is increased during startup, then coolant circulation is improved, but fuel efficiency deteriorates
Solution Approach 1:
The pump speed is dynamically adjusted based on real-time temperature measurements and engine operating conditions. The controller continuously monitors engine temperature and modifies coolant flow rate accordingly, transitioning from high flow during cold startup to reduced flow as temperature increases, optimizing both temperature control and fuel efficiency throughout the warm-up process
Solution Approach 2:
The system implements periodic adjustment of pump speed based on engine warm-up progress. High pump speed is maintained during initial cold startup phase to ensure adequate circulation, then the controller progressively reduces pump speed as the engine approaches operating temperature, creating a time-based periodic control pattern that balances circulation needs with fuel efficiency
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 allows for quick engine warm-up without fuel efficiency penalties, reducing calibration time and minimizing engine erosion risks associated with coolant boiling, while maintaining optimal coolant flow rates to maximize fuel efficiency.
Implementation Method 1
operate a pump to circulate coolant during the startup period of the engine
Implementation Method 2
The coolant is circulated to prevent the temperature of the engine from exceeding a second threshold
Implementation Method 3
receive a temperature signal from a first temperature sensor
Data Source
AI summary
A system including startup, load, flow, and peak estimation modules. The startup module, during a startup period or in response to a startup of the engine, receives a temperature signal and generates a first condition signal. The load module determines a load on the engine and generates a second condition signal. The flow module, if the first condition signal indicates a temperature of the engine is less than a first predetermined temperature and if the second condition signal indicates the load is less than a predetermined threshold, operates a pump to circulate coolant during the startup period. The peak estimation module estimates a temperature of a hottest metal location on the engine. The flow module increases a speed of the pump if the temperature of the hottest metal location is greater than a second predetermined temperature or the load is greater than or equal to the predetermined threshold.