Multi-Cylinder Engine Cooling via Variable Cross-Section Channels
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Solution Overview
Problem
Internal combustion engines with multiple cylinders in a row along the longitudinal axis face challenges in achieving uniform cooling with a small temperature difference between web areas, leading to inefficient heat transfer and increased friction, which affects fuel efficiency and emissions.
Innovation Solution
The implementation of a coolant channel system where the first coolant duct in the web area is connected to the second coolant duct through boreholes, allowing coolant to flow across the cylinder head and crankcase, with varying cross-sections to optimize coolant flow and temperature distribution, and the inclusion of a throttle element to control coolant flow during warm-up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If coolant channels are arranged in the web area between cylinders, then cooling of the web area is improved, but uniform temperature distribution along the longitudinal axis deteriorates
Solution Approach 1:
The coolant supply system is divided into multiple independently controllable channels: a first coolant channel supplying the web area and a second coolant channel supplying the cylinder head roof area. This segmentation allows differential cooling control to achieve uniform temperature distribution along the longitudinal axis while maintaining effective web area cooling.
Solution Approach 2:
Different regions of the engine are provided with different cooling characteristics through the segmented coolant system. The web area receives cooling from the first channel while the roof area receives cooling from the second channel, allowing each region to be optimized for its specific thermal requirements, thereby achieving overall temperature uniformity.
2Temperature
If coolant flow through the cylinder head is increased, then cooling efficiency is improved, but warm-up performance deteriorates
Solution Approach 1:
The coolant flow distribution is made dynamically adjustable through the throttle element in the second coolant channel. During warm-up, the throttle restricts flow to the roof area while maintaining web area cooling. During operation, the throttle opens to provide full cooling capacity, allowing the system to adapt to different thermal requirements.
Solution Approach 2:
The throttle element is positioned to preferentially supply coolant to the web area during the initial warm-up phase, ensuring that critical cooling needs are met before full cooling capacity is required. This preliminary prioritization of web area cooling maintains engine performance while reducing warm-up time.
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 ensures uniform temperature distribution along the engine's longitudinal axis, reduces frictional power loss, and leads to significant fuel savings by optimizing heat transfer and lubricant warming, while also reducing emissions and enhancing component protection.
Implementation Method 1
extremely uniform temperature distribution along the longitudinal axis of the internal combustion engine from web area to web area
Implementation Method 2
coolant to flow across the cylinder head and crankcase
Implementation Method 3
inclusion of a throttle element to control coolant flow during warm-up
Implementation Method 4
the first coolant duct in the web area is connected to the second coolant duct through at least one bore to carry coolant
Data Source
Figure 1
Figure 2
AI summary
The engine (1) has three cylinders arranged in series in a crank case (12). Two coolant channels (7, 8) are arranged in parallel to a longitudinal axis of the engine for the cylinder head and/or the crankcase. The coolant channels are connected with coolant by bar holes (9). A cylinder head (3) is transversely and partially flow throughable by the coolant along the longitudinal axis. A passage area of one of the coolant channels in a coolant flow direction is smaller while a passage area of the other coolant channel in the coolant flow direction is larger.