Hydraulic Clutch Control Valve Pressure Dynamics
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Solution Overview
Problem
Existing hydraulically actuated clutch systems face challenges in quickly filling the clutch cylinder without prematurely establishing torque transmitting capacity, which affects driving comfort due to dynamic pressure increases beyond the engagement point.
Innovation Solution
Decreasing the system pressure prior to and during the filling of the clutch cylinder through the clutch control valve allows for a high volume flow, reducing the pressure difference between filling and engagement point pressures, thereby enabling fast filling without premature torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a high filling pressure is applied to the clutch cylinder to reduce filling time, then the filling speed is improved, but the clutch may close beyond the engagement point causing premature torque transmission and impacting driving comfort
Solution Approach 1:
The system dynamically adjusts the system pressure in the hydraulic system to be lower during the filling phase, while maintaining higher clutch pressure through the control valve. This dynamic pressure management allows fast filling without exceeding the engagement point pressure, preventing premature torque transmission.
Solution Approach 2:
The invention changes the pressure parameters by decoupling system pressure from clutch pressure. The system pressure is reduced during filling, while the clutch pressure is controlled independently through the control valve to reach the engagement point pressure accurately, avoiding over-pressurization and premature torque transmission.
2Productivity
If the system pressure is decreased during filling, then the volume flow through the control valve increases enabling fast filling, but the pressure difference between filling and engagement point pressures is reduced
Solution Approach 1:
The control valve acts as an intermediary between the hydraulic system and the clutch cylinder. It receives hydraulic fluid at reduced system pressure and transforms it into the required clutch pressure through its internal pressure control mechanism, enabling both high flow rate and precise pressure control.
Solution Approach 2:
The control valve changes the pressure parameter from the reduced system pressure to the required clutch pressure. This parameter transformation allows the system to benefit from high volume flow due to reduced system pressure while still achieving the necessary engagement point pressure for proper clutch engagement.
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 method enables rapid filling of the clutch cylinder while maintaining target pressures, ensuring fast switching times without adverse impacts on driving comfort by controlling the pressure dynamics through the clutch control valve.
Implementation Method 1
a hydraulic system providing via a pump via a main pressure control a system pressure
Implementation Method 2
a clutch control valve having an inlet and an outlet. A system pressure is applied at the inlet of the control valve; the clutch pressure for actuating the clutch is provided at the outlet
Data Source
AI summary
A method of feeding a clutch cylinder in a hydraulically actuated clutch system in a motor vehicle and a respective hydraulically actuated clutch system are suggested. The clutch system comprises at least one clutch that can be closed by filling the clutch cylinder; and a hydraulic system that provides a system pressure and has a clutch control valve having an inlet and an outlet. A system pressure is applied at the inlet of the control valve; the clutch pressure for actuating the clutch is provided at the outlet; and the system pressure is decreased pressure prior to and during the filling of the clutch cylinder. The decreased system pressure allows a high volume flow and therefore a fast filling of the clutch cylinder without establishing a premature torque transmitting capacity in the clutch.