Adaptive Engine Cooling Water Temperature Control for Oil Heating
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Solution Overview
Problem
Conventional lubricating oil temperature control devices for internal combustion engines do not consider energy consumption efficiency in low rotational speed and medium or low load operation modes, leading to suboptimal annual energy consumption.
Innovation Solution
An internal combustion engine with an oil cooler that exchanges heat between engine cooling water and lubricating oil, controlled by a unit to maintain a constant temperature, allowing for cooling during high load and heating during low to medium load operations, and featuring a circulation passage with a heat exchanger and bypass to adjust cooling water temperature, along with an oil jet for lubricating the piston.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the lubricating oil is simply heated during warm-up operation, then the warm-up speed is improved, but the annual energy consumption efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the cooling water temperature adaptive rather than fixed. The cooling water temperature is dynamically adjusted based on engine operating conditions (load and temperature), allowing the system to switch between heating and cooling modes. This resolves the contradiction by enabling fast warm-up when needed while improving energy efficiency during normal operation through optimized temperature control.
Solution Approach 2:
The patent changes the parameter of cooling water temperature from a constant value to a variable parameter that depends on engine load and temperature conditions. By adjusting the cooling water temperature according to different operating modes (heating mode during warm-up, cooling mode during high load, and energy-efficient mode during normal operation), the system achieves both fast warm-up and improved annual energy consumption efficiency.
2Temperature
If the cooling water temperature is lowered to cool the lubricating oil during high load operation, then the lubricating oil temperature control is improved, but the engine thermal efficiency deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the cooling water temperature for different engine operating conditions. Instead of uniformly lowering cooling water temperature, the system provides localized temperature control: high cooling water temperature during normal operation to maintain engine thermal efficiency, and selective cooling only when lubricating oil temperature exceeds the target temperature during high load operation. This resolves the contradiction by applying cooling only where and when needed.
Solution Approach 2:
The system dynamically adjusts cooling water temperature based on real-time monitoring of engine load and lubricating oil temperature. The cooling water temperature is high during normal operation to preserve engine thermal efficiency, and selectively lowered only when lubricating oil cooling is required during high load operation. This dynamic adaptation resolves the contradiction between lubricating oil temperature control and engine thermal efficiency.
3Use of energy by moving object
If the cooling water temperature is raised to heat the lubricating oil during low to medium load operation, then the energy consumption efficiency is improved, but the lubricating oil temperature control precision deteriorates
Solution Approach 1:
The patent implements feedback control by continuously monitoring lubricating oil temperature and engine operating conditions, then adjusting cooling water temperature accordingly. The control unit receives temperature information and load information, compares the actual lubricating oil temperature with the target temperature, and adjusts the cooling water temperature to maintain precision. This feedback mechanism resolves the contradiction by ensuring temperature control precision is maintained even when using higher cooling water temperatures for energy efficiency.
4Device complexity
If a conventional lubricating oil temperature control device is used, then the device complexity is low, but the adaptability to different operation modes deteriorates
Solution Approach 1:
The patent applies universality by designing a cooling water temperature control system that performs multiple functions: heating the lubricating oil during warm-up operation, cooling the lubricating oil during high load operation, and maintaining energy-efficient operation during normal load conditions. This multi-functional system resolves the contradiction by providing adaptability to different operation modes while maintaining reasonable device complexity through integrated control.
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 configuration improves annual energy consumption efficiency by optimizing thermal efficiency in low to medium load operations, reducing mechanical losses, and preventing lubricating oil consumption increases.
Implementation Method 1
an oil cooler having a passage via which heat is exchanged between engine cooling water and lubricating oil
Implementation Method 2
a heat exchanger disposed in the passage via which the heat is exchanged between the engine cooling water and the lubricating oil, the heat exchanger being configured to cool the engine cooling water
Data Source
AI summary
An internal combustion engine, which can improve an annual energy consumption efficiency, is provided. A gas engine 1 includes: an oil cooler 11 having a passage via which heat is exchanged between engine cooling water and lubricating oil; and a control unit 12 configured to control a temperature of the engine cooling water to a constant temperature so as to cool the lubricating oil during high load operation and to heat the lubricating oil during low to medium load operation. The control unit 12 increases the temperature of the engine cooling water during low to medium load operation compared with the temperature of the engine cooling water during high load operation. An oil jet 18a, which is configured to inject the lubricating oil into a rear surface of a piston 17, is provided.