Vehicle Coolant Circuit Dual Flow Control Units
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Solution Overview
Problem
Existing coolant circuits in vehicles, which rely on a two-way thermostat and a bypass line, face challenges in efficiently managing coolant temperature during engine warm-up, particularly when the engine and coolant are cold, leading to delayed warm-up times.
Innovation Solution
The implementation of a coolant circuit with two spatially separated flow control units allows for independent control of coolant flow in the main duct and bypass duct based on engine operating states, such as coolant temperature and engine speed, enabling more flexible design and faster engine warm-up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a two-way thermostat and bypass line are used to control coolant temperature, then the coolant can be directed past the radiator during warm-up, but the disposal of components in the engine bay is restricted and the thermostat must be close to the engine or radiator
Solution Approach 1:
The single two-way thermostat is segmented into two separate flow control units positioned at different locations in the coolant circuit. The first flow control unit is positioned near the engine while the second is positioned near the radiator, allowing each to independently control coolant flow in its respective region without the positioning constraints of a single two-way thermostat.
Solution Approach 2:
The control system is extended from a single-point control (one thermostat) to a distributed multi-point control system. By adding the spatial dimension of multiple control units at different positions in the coolant circuit, the system gains flexibility in component disposal while maintaining effective temperature control.
2Loss of time
If a two-way thermostat is used to control coolant flow, then the bypass line can be opened during cold-start, but the warm-up time of the engine is delayed due to the single control point limitation
Solution Approach 1:
The flow control function is segmented into two independent units that can operate simultaneously with different control strategies. The first flow control unit can rapidly open the bypass during cold-start while the second unit manages radiator flow, enabling faster warm-up by removing the bottleneck of a single thermostat's response time.
Solution Approach 2:
The system transitions from static single-point control to dynamic multi-point control where each flow control unit can independently and rapidly respond to temperature changes. This dynamic distribution of control functions allows for more aggressive warm-up strategies by quickly directing coolant away from the radiator when needed.
3Adaptability or versatility
If two flow control units are used instead of one two-way thermostat, then the component disposal freedom is increased and flow control flexibility is improved, but the number of components in the coolant circuit increases
Solution Approach 1:
The control function is divided into two separate units, each responsible for a specific region of the coolant circuit. This segmentation allows each unit to be optimized for its local requirements while maintaining overall system flexibility, with the first unit handling engine-proximal flow control and the second handling radiator-proximal flow control.
Solution Approach 2:
Each flow control unit is designed as a universal module that can perform multiple functions: temperature sensing, flow regulation, and bypass control. This multi-functionality reduces the need for additional specialized components, partially offsetting the increase in component count by making each unit more versatile.
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 reduces engine warm-up time by allowing coolant to bypass the radiator at low temperatures, and ensures consistent coolant temperature by optimizing flow control as the engine reaches operating temperature.
Implementation Method 1
the first flow control unit senses the temperature of the coolant and accordingly sets the flow of the coolant
Implementation Method 2
the second flow control unit to actively open or close the bypass duct directly as a function of the temperature of the coolant
Implementation Method 3
the heated coolant is thereafter pumped onward into the radiator where the heated coolant is cooled by air
Data Source
AI summary
A coolant circuit in a vehicle includes a first flow control unit disposed in a main duct between an engine and a radiator. The first flow control unit, as a function of a temperature of a coolant, thermostatically controls a flow of the coolant. A bypass duct is fluidically disposed parallel to the radiator where the bypass duct opens into the main duct after the radiator and branches off the main duct between the engine and the first flow control unit. A second flow control unit is disposed in the bypass duct where the second flow control unit is configured such that the second flow control unit opens or closes the bypass duct as a function of the temperature of the coolant.