Hydraulic Pump Control Valve for Automatic Transmission Pressure
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Solution Overview
Problem
Automatic transmissions face issues with system pressure for actuating switching elements due to separate hydraulic fluid supply circuits, leading to inadequate hydraulic fluid supply in certain operating modes.
Innovation Solution
A method for controlling the hydraulic medium supply system in automatic transmissions, where a cooling valve adjusts power distribution between engine-side and wheelset-side hydraulic pumps based on detected vehicle parameters to optimize fluid supply and consumption, allowing for adaptive control of hydraulic fluid flow according to different operating modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hydraulic pumps are assigned to separate hydraulic fluid households or systems, then structural independence and dedicated function are achieved, but system pressure for actuating switching elements becomes insufficient in certain operating modes
Solution Approach 1:
The patent merges the previously separate hydraulic fluid households into a common hydraulic fluid supply circuit, allowing the engine-side driven hydraulic pump and wheelset-side driven hydraulic pump to share resources and support each other, ensuring sufficient system pressure for actuating switching elements across all operating modes
2Device complexity
If hydraulic pumps operate independently in separate systems, then system simplicity and ease of control are maintained, but hydraulic fluid supply efficiency is insufficient in certain operating modes
Solution Approach 1:
The patent implements dynamic control of the cooling valve based on detected operating modes, allowing the hydraulic system to adaptively adjust fluid distribution between cooling and actuation functions. This dynamic adjustment optimizes hydraulic fluid supply efficiency for different operating conditions without increasing structural complexity
Solution Approach 2:
The system uses feedback from detected operating modes to control the cooling valve position, enabling adaptive power distribution between hydraulic pumps. This feedback mechanism ensures optimal hydraulic fluid supply efficiency by adjusting system behavior based on real-time operating conditions
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
Ensures efficient and consumption-optimized hydraulic fluid supply, preventing system pressure deficiencies and ensuring proper actuation and cooling of transmission elements across various driving conditions.
Implementation Method 1
A cooling valve of the hydraulic fluid supply system for supplying oil or hydraulic fluid is controlled as a function of detected vehicle parameters or the like in order to set an adapted, consumption-optimized power distribution in the hydraulic pumps
Data Source
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AI summary
The invention relates to a method for controlling a hydraulic-medium supply system of an automatic transmission of a vehicle, wherein the hydraulic-medium supply system is supplied with hydraulic medium at least by an engine-driven hydraulic pump (FZP-Pu) and by a gear-set-driven hydraulic pump (RS-Pu). According to the invention, a cooling valve of the hydraulic-medium supply system for supplying hydraulic medium is controlled in dependence on sensed vehicle parameters in order to set an adapted delivery-rate distribution for the hydraulic pumps (FZP-Pu, RS-Pu).