Electric Water Pump Control for Engine Warm-Up
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Solution Overview
Problem
The internal combustion engine's cooling water temperature rises less responsively than the combustion chamber wall temperature during engine warm-up, leading to delayed overall engine warm-up and reduced combustion performance if the electric water pump's flow rate is controlled solely based on combustion chamber wall temperature.
Innovation Solution
A cooling device and method that control the electric water pump's discharge flow rate according to both the cooling water temperature below a warm-up completion determination temperature and the combustion chamber wall temperature when it exceeds this threshold, ensuring efficient engine warm-up by adjusting the flow rate based on these conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flow rate of the electric water pump is controlled based on the combustion chamber wall temperature from cold engine start, then the cooling water demand for after engine warm-up completion is met, but the temperature rise of the cooling water is slowed down and overall engine warm-up is delayed
Solution Approach 1:
The control system dynamically switches between two control modes based on the cooling water temperature relative to the engine warm-up completion temperature. During warm-up (cooling water temperature below threshold), the system uses cooling water temperature-based control to accelerate warming. After warm-up completion (cooling water temperature above threshold), it switches to combustion chamber wall temperature-based control for proper cooling management. This dynamic adaptation resolves the contradiction by optimizing control strategy for each operational phase.
Solution Approach 2:
The invention changes the control parameter from combustion chamber wall temperature to cooling water temperature during the warm-up phase, and then switches back to combustion chamber wall temperature after warm-up completion. This parameter switching allows the system to prioritize cooling water temperature rise during warm-up while maintaining combustion chamber temperature control afterward, thus resolving the time loss issue.
2Temperature
If the flow rate is controlled to meet cooling water demand after engine warm-up completion, then cooling performance is improved, but the combustion performance after warm-up is reduced due to delayed warm-up
Solution Approach 1:
The system dynamically adjusts the control strategy based on engine operational phase. During warm-up, it prioritizes cooling water temperature rise to enable faster engine warm-up, which is critical for combustion performance. After warm-up completion, it transitions to combustion chamber wall temperature-based control to ensure proper cooling and maintain optimal combustion conditions. This dynamic approach ensures both temperature control and combustion performance are optimized at different stages.
Solution Approach 2:
The system performs preliminary action by accelerating cooling water temperature rise during the warm-up phase through appropriate flow rate control. This preliminary heating of cooling water ensures that the engine reaches optimal operating temperature faster, which directly improves combustion performance. The control system prepares the cooling system in advance to support efficient combustion once the engine is warmed up.
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 prevents slowing down of the engine warm-up process and improves combustion performance by optimizing the cooling water temperature rise and combustion chamber wall temperature management.
Implementation Method 1
an electric water pump for circulating cooling water through the internal combustion engine of the vehicle
Data Source
AI summary
The cooling device according to the present invention includes an electric water pump for circulating cooling water through an internal combustion engine of a vehicle, and controls the discharge flow rate of the electric water pump as follows. Until the cooling water temperature. TW reaches a warm-up completion determination temperature, the cooling device increases the discharge flow rate along with an increase of the cooling water temperature TW. After the cooling water temperature TW reaches the warm-up completion determination temperature, the cooling device controls the discharge flow rate so as to bring the combustion chamber wall temperature TCYL toward a target temperature. Thereby, the cooling device can warm up the internal combustion engine more efficiently, and improve the combustion performance of the internal combustion engine after the completion of warm-up.