Torque Converter Fluid Routing via Dual Pump Segmentation
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Solution Overview
Problem
Existing automatic transmission systems with torque converters face challenges in efficiently routing and managing transmission fluid, particularly in supplementing the fluid supply during different operating modes, which can lead to inefficiencies and potential overheating.
Innovation Solution
A system comprising multiple pumps, valves, and a control circuit that selectively routes transmission fluid between electro-hydraulic components, the torque converter, and a lubrication system, including a cooler, to manage fluid flow and pressure during torque converter and lockup operating modes, ensuring optimal fluid distribution and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single pump supplies transmission fluid to the torque converter, then the system is simpler, but the fluid supply may be insufficient during torque converter operation leading to overheating
Solution Approach 1:
The patent divides the transmission fluid supply function into two separate pumps: a first pump dedicated to supplying fluid to the torque converter and a second pump supplying fluid to the lubrication system. This segmentation allows each pump to be optimized for its specific function while collectively providing sufficient fluid supply without requiring an oversized single pump.
Solution Approach 2:
The patent implements a valve system that enables the second pump to serve dual functions: supplying lubrication system fluid normally, and supplementing torque converter fluid supply when needed. This multi-functionality allows the system to handle variable fluid demands without requiring a dedicated high-capacity pump for the torque converter alone.
2Temperature
If transmission fluid is continuously routed through the torque converter, then cooling is improved, but fluid pressure and flow control becomes more complex
Solution Approach 1:
The patent employs dynamically controllable valves that adjust fluid routing based on real-time operating conditions. The first valve responds to control pressure to route fluid through the torque converter during torque converter operation mode, while the second valve adjusts flow distribution between pumps. This dynamic control enables adaptive cooling without requiring a fixed complex routing system.
Solution Approach 2:
The patent introduces control pressure as an intermediary mechanism to manage fluid routing. The control pressure, generated by the second valve, acts as a mediator that coordinates the operation of both valves and pumps, simplifying the overall control logic while enabling sophisticated fluid management for temperature control.
3Quantity of substance
If both pumps supply fluid to the torque converter simultaneously, then fluid supply is sufficient, but pressure control and flow management becomes difficult
Solution Approach 1:
The patent applies local quality control by directing pump outputs to different destinations based on system needs. The first pump is dedicated to the torque converter pathway, while the second pump primarily serves the lubrication system. The valves create localized flow control points that manage pressure and flow independently in each pathway, avoiding the complexity of simultaneously managing both pumps to a single destination.
Solution Approach 2:
The patent replaces direct mechanical connection of both pumps to the torque converter with a hydraulic control system using valves and control pressure. This substitution allows sophisticated flow and pressure management through fluid-based control signals rather than direct mechanical coupling, enabling independent pump operation with coordinated output.
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 system enhances fluid management and cooling, improving transmission efficiency and reducing the risk of overheating by selectively routing transmission fluid and adjusting pressure, thereby optimizing performance across different operating modes.
Implementation Method 1
a cooler coupled to the lubrication system of the transmission that may be configured to cool transmission fluid passing therethrough
Implementation Method 2
a valve configured to route transmission fluid supplied by the second pump through the torque converter to the lubrication system
Data Source
AI summary
A torque converter coupled to a transmission has a torque converter operating mode and a lockup operating mode. A first pump may be configured to supply transmission fluid to a plurality of electro-hydraulic transmission components. A second pump may be configured to supply transmission fluid to a lubrication system of the transmission. A valve may be configured to route transmission fluid supplied by the second pump through the torque converter during the torque converter operating mode. Means may also be provided for selectively routing at least some of the transmission fluid supplied by the first pump through the torque converter. Illustratively, transmission fluid supplied by the first pump may, but need not, be routed to the torque converter only during the torque converter operating mode or only during the torque converter operating mode if the temperature of transmission fluid exiting the torque converter exceeds a threshold temperature.