Internal Combustion Engine Water Passage System for Cylinder Deactivation
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Solution Overview
Problem
Internal combustion engines face inefficiencies in heat exchange and warm-up processes, particularly in V-type engines, where deactivatable and constantly operating cylinder groups require optimized water passage systems to enhance temperature management and device warm-up efficiency.
Innovation Solution
The engine incorporates a deactivatable cylinder group, a constantly operating cylinder group, and a complex water passage system with integrated passages that allow selective operation and heat exchange, including an upstream integrated water passage, downstream integrated water passage, connecting passage, and third water passage, which enables efficient heat distribution and temperature control by diverting water around the radiator based on temperature thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional cooling-water passage system is used in V-type engines, then the structure is simple, but the warm-up efficiency of devices such as transmission and throttle valve is insufficient
Solution Approach 1:
The cooling-water passage system is segmented into multiple independent passages: a first cooling-water passage for the cylinder block, a second cooling-water passage for the cylinder heads, and a third cooling-water passage for device warm-up. This segmentation allows each passage to be optimized for its specific function, enabling efficient heat distribution to devices while maintaining manageable structural complexity
Solution Approach 2:
Different regions of the engine are assigned different thermal management characteristics through localized water passages. The first passage serves the cylinder block, the second serves the cylinder heads, and the third specifically targets device warm-up. This local differentiation optimizes heat exchange efficiency for each component while collectively improving overall system performance
2Use of energy by moving object
If deactivatable cylinders are used to improve fuel efficiency, then energy consumption is reduced, but temperature management becomes more complex
Solution Approach 1:
The cooling-water passages are merged into an integrated system where the first, second, and third passages are interconnected through water inlets and outlets. This unified approach allows thermal management of both active and deactivated cylinders to be coordinated, simplifying control while maintaining fuel efficiency benefits from cylinder deactivation
Solution Approach 2:
The third cooling-water passage serves multiple functions: it extracts heat from both the cylinder block and cylinder heads, and distributes this heat to external devices requiring warm-up. This multi-functional design handles the thermal management complexity of deactivatable cylinders while improving overall system efficiency
3Measurement precision
If separate cooling-water passages are provided for deactivatable and constantly operating cylinder groups, then temperature control precision is improved, but device complexity increases
Solution Approach 1:
The integrated water passage system enables thermal feedback between different engine components. Heat extracted from the cylinder block and cylinder heads through the first and second passages is fed into the third passage for device warm-up, creating a coordinated thermal management system that achieves precise temperature control without excessive complexity
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 enhances warm-up efficiency by selectively deactivating cylinders and directing high-temperature water to critical components, such as the transmission, thereby improving overall engine temperature management and device warm-up speed.
Implementation Method 1
water (medium) is caused to flow in the cooling-water passages to perform heat exchange among cylinders, combustion chambers, and the water
Implementation Method 2
The device is provided adjacent to at least a part of the third water passage to exchange heat with water flowing in the third water passage
Data Source
AI summary
An internal combustion engine includes a deactivatable cylinder group, a constantly operating cylinder group, a first water passage, a second water passage, an upstream integrated water passage, a downstream integrated water passage, a connecting passage, a third water passage, and a device. The downstream integrated water passage includes a junction and an upstream end. The upstream end is closer to the second water passage than to the first water passage in the downstream integrated water passage. The third water passage connects the connecting passage and a portion provided between the junction and the upstream end in the downstream integrated water passage. The device is provided adjacent to at least a part of the third water passage to exchange heat with water flowing in the third water passage.