Engine Cooling Valve Design for Thermal Shock Reduction
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Solution Overview
Problem
Existing engine coolant systems suffer from oscillations in the top valve state as the engine warms, leading to thermal shocks that can negatively impact engine performance and service life due to uneven coolant temperature distribution.
Innovation Solution
A motor vehicle engine cooling system with a fluid flow control device featuring a radiator outlet valve that automatically opens downstream of the coolant flow direction, reducing the initial force required to open the valve and minimizing oscillations by using a pressure differential across the valve, which is actuated by coolant pressure rather than external actuators, and coordinated with a coolant pump operating at different pumping rates based on vehicle operating parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the top valve is controlled by external actuators to direct coolant flow, then the coolant flow can be controlled to cool the engine, but the valve state oscillates as the engine warms causing thermal shocks
Solution Approach 1:
The closure member is designed to automatically respond to pressure differential across the valve without external actuators. When the pressure differential exceeds a prescribed value, the closure member autonomously transitions between open and closed positions, eliminating the oscillation problem caused by external actuator control while maintaining effective coolant flow control for engine temperature management.
2Ease of operation
If the closure member opens against the coolant flow direction, then the valve can be controlled to direct coolant flow, but more force is required to open the valve causing rapid movement and oscillations
Solution Approach 1:
The closure member is arranged to open in a direction downstream of the coolant flow direction, which is opposite to the conventional approach of opening against the flow. This inversion allows the coolant pressure to assist rather than resist the opening motion, reducing the initial force required and preventing rapid valve movement that causes oscillations, while still achieving effective coolant flow 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 solution stabilizes coolant flow, reduces thermal shocks, and improves engine performance by ensuring consistent coolant distribution, thereby extending engine service life and enhancing thermal control.
Implementation Method 1
The closure member of the valve of the fluid flow control device automatically assumes the open position when a pressure differential across the valve exceeds a prescribed value
Implementation Method 2
a radiator conduit (126C) arranged to direct flow through a radiator (126) of the system
Data Source
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AI summary
In one aspect of the invention there is provided a motor vehicle engine cooling system, the cooling system comprising a fluid flow control device having first and second fluid inlets and first and second fluid outlets. The first fluid inlet is arranged to be connected to a cylinder head coolant outlet of the engine and the second fluid inlet is arranged to be coupled to a cylinder block coolant outlet of the engine. The first fluid outlet is coupled to a radiator bypass conduit of the cooling system and the second fluid outlet is coupled to a radiator conduit of the cooling system and arranged to direct to flow through a radiator of the system. The device comprises a radiator outlet valve operable to control a flow of fluid out from the device through the second outlet, the valve having a closure member operable between an open position and a closed position responsive to a temperature of coolant flowing through the device, wherein when the closure member transitions from the closed position to the open position the closure member is arranged to be displaced in a direction downstream of a direction of flow of coolant through the second outlet.