Hydraulic Priority Valve Control for Dual-Clutch Pressure Management
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Solution Overview
Problem
Existing hydraulic systems for gear control in double clutch transmissions face challenges in efficiently managing pressure levels, leading to complexity, error proneness, and increased costs due to the need for multiple pressure systems.
Innovation Solution
A hydraulic circuit with a priority valve system that allows for need-dependent pressure levels, prioritizing clutch operations over cooling and lubrication, and using a single valve to control pressure distribution, thereby reducing the complexity and cost of the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple pressure systems are used to ensure sufficient pressure for clutch operations and cooling/lubrication, then the reliability of clutch actuation is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple hydraulic functions (clutch actuation, cooling, lubrication) into a single integrated hydraulic circuit that operates at different pressure levels. The high-pressure line serves clutch actuators while the low-pressure line serves cooling and lubrication components, eliminating the need for separate pressure systems and reducing overall system complexity.
Solution Approach 2:
The hydraulic circuit is segmented into different pressure zones (high-pressure line and low-pressure line) that can operate independently. This segmentation allows each subsystem to optimize its pressure level for specific functions while sharing a common hydraulic source, resolving the contradiction between reliability and complexity.
2Adaptability or versatility
If multiple pressure generators are used to provide different pressure levels for different hydraulic functions, then the adaptability of the hydraulic system is improved, but the device complexity increases
Solution Approach 1:
A single hydraulic pressure generator is designed to serve multiple functions by providing both high-pressure and low-pressure outputs through a differential pressure arrangement. The system can adapt to different operational requirements (clutch actuation, cooling, lubrication) using one multi-functional pressure source rather than multiple specialized generators.
3Speed
If high pressure is maintained continuously in the hydraulic circuit to ensure clutch operation readiness, then the responsiveness of clutch actuation is improved, but the energy consumption increases
Solution Approach 1:
The hydraulic system dynamically adjusts pressure levels based on operational demands. High pressure is maintained in the clutch actuation line only when needed, while cooling and lubrication functions operate at lower pressures. This dynamic pressure management improves responsiveness when required while reducing energy consumption during normal operation.
Solution Approach 2:
The system employs periodic or demand-based high-pressure activation for clutch operations rather than continuous high-pressure maintenance. The differential pressure arrangement allows rapid pressure buildup when clutch actuation is required, providing responsive performance without the penalty of continuous high energy input.
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 solution enables efficient operation of double clutch transmissions by ensuring sufficient pressure for clutch operations while minimizing energy expenditure on pressure levels, thus enhancing reliability and reducing costs.
Implementation Method 1
supply a first hydraulic fluid flow Q1 to a first working port 181 and supply a second hydraulic fluid flow Q2 to a second working port 183 at a pressure level that is lower than the pressure level of the first hydraulic fluid flow Q1
Data Source
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AI summary
The present invention relates to a transmission control, in which hydraulic flows can be prioritized in a different manner. Such a hydraulic system can for example supply a group of at least two clutch actuators. Furthermore, the present invention relates to a method, e.g. using a valve, in which different power supplies, especially for different regions of the hydraulic circuit, can be carried out by means of a hydraulic circuit.