Internal Combustion Engine Cooling System With Reversible Flow Control
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Solution Overview
Problem
Existing cooling systems for internal combustion engines face challenges in preventing local boiling of cooling water, especially during engine startup, which can lead to inefficient warm-up and potential damage.
Innovation Solution
A cooling system with a water pump and a control device that switches the flow direction of cooling water between forward and reverse flows within the engine's passages, utilizing an ECU to manage the water pump's operation and temperature thresholds to prevent boiling and enhance warm-up efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the water pump operates continuously to cool the engine, then the engine temperature is maintained, but the warm-up efficiency is reduced and fuel consumption increases
Solution Approach 1:
The water pump operates intermittently rather than continuously, with periodic on/off cycles controlled by the ECU based on engine temperature conditions. This periodic operation reduces energy consumption while maintaining effective cooling when needed
Solution Approach 2:
The system dynamically adjusts water pump operation based on real-time engine temperature conditions. The ECU monitors temperature and activates the pump only when necessary, creating a dynamic control system that adapts to changing thermal conditions
2Loss of energy
If the water pump stop period is extended to improve fuel economy, then fuel consumption is reduced, but local boiling of cooling water occurs
Solution Approach 1:
The ECU continuously monitors engine temperature and uses this feedback to determine when the water pump should operate. This closed-loop control ensures the pump activates before local boiling conditions develop, maintaining reliability while optimizing fuel consumption
Solution Approach 2:
The system takes preliminary action by activating the water pump before critical temperature conditions occur. The ECU anticipates potential boiling risks and triggers pump operation in advance, preventing the harmful effect before it manifests
3Reliability
If the water pump operates at high speed to prevent boiling, then cooling effectiveness is improved, but the stop period is reduced and fuel consumption increases
Solution Approach 1:
Instead of maintaining high-speed pump operation continuously, the system applies partial action by operating the pump at appropriate speeds only when and where needed. This selective operation maintains sufficient cooling effectiveness while reducing overall energy consumption
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 allows for earlier engine warm-up while avoiding local boiling, improving warm-up efficiency and extending the stop period of the water pump during engine startup, thus enhancing engine performance and longevity.
Implementation Method 1
an electric water pump pumps cooling water to a cooling water passage in order to warm up and cool the internal combustion engine
Implementation Method 2
cooling water passage in a cylinder head and a cylinder block of an internal combustion engine and an electric water pump pumps cooling water to a cooling water passage in order to warm up and cool the internal combustion engine
Data Source
AI summary
The cooling system is provided with an internal passage for circulating the cooling water inside an internal combustion engine, a water pump provided in an one end side external passage connected to the one end portion of the internal passage, and an ECU configured to execute a water flow switching control that switches a cooling water flow in the internal passage between a forward flow directed from the one end portion of the internal passage to the other end portion and a reverse flow directed from the other end portion to the one end portion.