3-Line Hydrodynamic Coupling Lockup Clutch Pressure Control
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Solution Overview
Problem
Existing hydrodynamic coupling devices face inefficiencies in operation, particularly in managing fluid circulation and torque transmission under varying load and temperature conditions, leading to potential overheating and reduced performance.
Innovation Solution
A method for operating an open 3-line type hydrodynamic coupling device that adjusts fluid supply pressures in different operating states to ensure efficient fluid circulation and torque conversion, using a lockup clutch with fluid channels to manage fluid flow and pressure differentials between internal spaces, thereby preventing overheating and optimizing torque transmission capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If fluid supply pressure is increased to maintain torque transmission capacity under high load, then torque conversion performance is improved, but energy consumption and fluid circulation requirements increase
Solution Approach 1:
The patent applies dynamic pressure control by adjusting fluid supply pressures (first supply pressure to first space area, second supply pressure to second space area) based on operating conditions such as load and temperature. The control device dynamically modifies pressure levels to match actual torque transmission requirements, avoiding constant high pressure operation and thereby reducing energy consumption while maintaining adequate torque capacity.
Solution Approach 2:
The system changes fluid pressure parameters adaptively - varying the first and second supply pressures according to operating state (load, temperature). This parameter adjustment allows the system to maintain torque transmission capacity when needed while operating at lower pressures during normal conditions, thus resolving the contradiction between power output and energy consumption.
2Temperature
If fluid circulation is increased to prevent overheating under high temperature conditions, then thermal management is improved, but energy consumption and system complexity increase
Solution Approach 1:
The control device implements feedback control by monitoring operating conditions (including temperature and load) and adjusting fluid supply pressures accordingly. When high temperature is detected, the system increases fluid circulation through pressure adjustment to enhance cooling, while returning to lower pressure operation when cooling demands decrease, thereby managing thermal conditions efficiently without continuous high energy input.
Solution Approach 2:
The system employs periodic or conditional fluid circulation enhancement rather than continuous high-pressure operation. Fluid supply pressure is increased temporarily or conditionally based on thermal demands, allowing the system to manage heat effectively while minimizing overall energy consumption through intermittent high-circulation periods.
3Use of energy by moving object
If lockup clutch is engaged to reduce slippage and improve efficiency, then energy consumption is reduced, but fluid pressure requirements and potential overheating risk increase
Solution Approach 1:
The patent segments the fluid circulation system into two independent pressure-controlled zones (first space area and second space area) that can be managed separately. This segmentation allows the control device to optimize fluid pressure in each zone independently - maintaining pressures that enable lockup clutch engagement for efficiency while ensuring adequate fluid flow for thermal management, thereby resolving the contradiction between energy efficiency and overheating risk.
4Productivity
If fluid supply pressure is adjusted dynamically to optimize performance, then operational efficiency is improved, but control system complexity increases
Solution Approach 1:
The control device performs multiple functions: it manages torque transmission by adjusting first and second supply pressures, controls thermal management through fluid circulation regulation, and optimizes energy consumption - all through a single integrated pressure control system. This multi-functionality achieves high operational efficiency without proportionally increasing system complexity, as one control unit handles multiple objectives through coordinated pressure adjustment.
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
The method ensures efficient operation by maintaining sufficient fluid circulation and torque conversion capacity while minimizing energy consumption, preventing overheating and overload, even under high load and temperature conditions, thereby enhancing the reliability and performance of the coupling device.
Implementation Method 1
a fluid pump for supplying hydraulic fluid to the first and second space areas under different pressures
Implementation Method 2
supplying a fluid supply pressure to the first space area and a fluid supply pressure to the second space area, in particular depending on at least one operating variable
Implementation Method 3
a hydrodynamic coupling device comprising a housing arrangement which is filled, or can be filled, with fluid, an impeller which is rotatable with the housing arrangement around an axis of rotation, a turbine which is arranged in the housing arrangement and coupled with a driven member for rotation around the axis of rotation
Implementation Method 4
In the engaged state of the lockup clutch, the clutch piston 50 can be pressed by its radially outer region against an inner surface of the housing 12, in this case the housing shell 14. For this purpose, a friction facing can be provided, for example, at the clutch piston 50
Implementation Method 5
The torque transmission connection between the clutch piston 50 and the turbine hub 32 is carried out by a torsional vibration damper arrangement 56 whose input region is connected to the clutch piston 50 and whose output region is connected to the turbine hub 32
Data Source
AI summary
A method for operating an open 3-line type hydrodynamic coupling device, in which a fluid pressure displacing a clutch piston in an engaging direction is provided in the first space area for engaging the lockup clutch, and a fluid pressure displacing the clutch piston in the disengaging direction is provided in a second space area for disengaging the lockup clutch. A fluid supply pressure for the first space area and/or a fluid supply pressure for the second space area are/is adjusted depending on at least one operating variable in the engaged state of the lockup clutch and/or in the disengaged state of the lockup clutch and/or for engaging the lockup clutch and/or for disengaging the lockup clutch.