Rotary Slide Valve for Engine Cooling Flow Control
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Solution Overview
Problem
Existing internal combustion engine cooling systems lack efficient control over coolant flow and pressure loss in the cylinder head, exhaust, and combustion chamber water jackets, which affects the cooling effectiveness and engine performance.
Innovation Solution
A valve with a rotary slide that adjusts the cross-sectional flow areas of the exhaust and combustion chamber coolant outlets, allowing for multi-channel designs and synchronized or opposing adjustments to optimize coolant flow and reduce pressure loss, integrated with an electrical actuator for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the coolant flow cross-section is increased to improve cooling effectiveness, then the cooling efficiency is improved, but the pressure loss increases
Solution Approach 1:
The patent employs a rotary slide valve that can dynamically adjust the coolant flow cross-section to different positions (first, second, third positions) depending on operating conditions. This dynamic adjustment allows the system to optimize between cooling efficiency and pressure loss by selecting appropriate flow cross-sections based on real-time engine requirements.
Solution Approach 2:
The invention changes the physical parameter of coolant flow cross-section by rotating the slide valve to different angular positions. Each position exposes different portions of the valve opening to the coolant flow path, thereby changing the effective flow area and velocity, which directly affects both cooling efficiency and pressure loss characteristics.
2Device complexity
If a single coolant outlet is used for both exhaust and combustion chamber water jackets, then the device complexity is reduced, but the adaptability of cooling control is limited
Solution Approach 1:
The patent segments the single coolant outlet into two separate outlets: an exhaust coolant outlet for the exhaust water jacket and a combustion chamber coolant outlet for the combustion chamber water jacket. The rotary slide valve is correspondingly segmented with separate control passages for each outlet, allowing independent flow control to each water jacket while maintaining a unified valve structure.
3Temperature
If the coolant flow velocity is increased to improve cooling effectiveness, then the cooling efficiency is improved, but the pressure loss increases
Solution Approach 1:
The rotary slide valve provides dynamic control over coolant flow velocity by adjusting the flow cross-section area. When high cooling effectiveness is required, the valve opens to a larger cross-section that maintains adequate flow velocity while reducing pressure loss. When cooling demand is lower, the valve restricts flow to maintain optimal velocity without excessive pressure drop.
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 enhances coolant flow and cooling efficiency by varying the cross-sectional areas of the coolant outlets, improving the thermal management of the engine and reducing pressure loss, leading to improved engine performance and compact design.
Implementation Method 1
the cross-section, through which a fluid can flow, of an exhaust coolant outlet of a valve and a cross-section, through which a fluid can flow, of a combustion chamber coolant outlet of the valve can be connected and continuously adjusted
Implementation Method 2
through which a cross-section, through which a fluid can, in particular does, flow of an exhaust coolant outlet of the valve is flowed through or is supplied or charged or fed or has delivered coolant through the exhaust water jacket
Data Source
AI summary
An internal combustion engine for a motor vehicle drive includes a housing having a cylinder head water jacket, an exhaust water jacket and a combustion chamber water jacket. A valve is operable for adjusting a flow through a multi-channel coolant inlet. In particular, the valve provides continuous adjustment of a cross section, through which a fluid can flow of a multi-channel exhaust coolant outlet for admitting a flow to the exhaust water jacket and cross-section, through which a fluid can flow of a multi-channel combustion chamber coolant outlet for admitting a flow to the combustion chamber water jacket.