Hydraulic Actuator Control Reducing Valve Dead Time
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Solution Overview
Problem
Hydraulic transmission actuators in motor vehicles face inefficiencies due to dead time between valve position changes, which limits dynamics and optimal operating points, particularly in dual-clutch transmissions.
Innovation Solution
Implementing a combined path and angle control method with a negative overlap valve that cross-fades position and angle control, allowing hydraulic fluid flow from the start of valve switching, thereby reducing dead time and optimizing operating points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a traditional valve switching control is used, then the control structure is simple, but dead time occurs between valve position changes which reduces system dynamics
Solution Approach 1:
The patent applies preliminary action by initiating hydraulic fluid flow before the valve switching is complete. The angular control starts delivering hydraulic fluid during the valve transition phase, so that when the valve reaches its final position, the hydraulic actuator is already in motion or near its target position, eliminating the dead time between valve switching and actuator response.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining hydraulic fluid flow throughout the valve switching process. Instead of having discrete on/off control with gaps, the system provides continuous hydraulic pressure delivery during the entire valve transition, ensuring the actuator receives continuous useful action without interruption or delay.
2Speed
If position control is used alone, then the control accuracy is good, but the response speed during valve switching is limited
Solution Approach 1:
The patent merges position control and angular control into a hybrid control system. The position control ensures the actuator reaches the correct final position with high accuracy, while the angular control provides rapid response during valve switching by controlling the pump's angular position. The combination of both control modes achieves both fast response and high precision.
3Measurement precision
If the valve switching is delayed to ensure position accuracy, then control precision is maintained, but the system dynamics and responsiveness are reduced
Solution Approach 1:
The system performs preliminary action by starting the hydraulic fluid delivery before the valve switching is complete. The angular control component activates during the valve transition phase, preparing the hydraulic actuator in advance so that position accuracy is achieved without delaying the overall response, thereby maintaining both precision and responsiveness.
4Stability of the object's composition
If the dead time between valve positions is utilized, then the valve switching can be smoother, but the system responsiveness and dynamics are reduced
Solution Approach 1:
The patent eliminates unused dead time by maintaining continuous useful action during valve switching. The angular control ensures hydraulic fluid flow continues throughout the valve transition, converting what would be dead time into productive action, thus achieving both smooth switching and high responsiveness simultaneously.
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 approach enhances the dynamics of hydraulic transmission actuators by reducing unused dead time and ensuring smoother transitions, leading to improved control accuracy and optimized operating points.
Implementation Method 1
a volume flow source (8) is connected to at least one hydraulic cylinder (16, 17) via a pressure line (10) filled with hydraulic fluid
Data Source
Figure 1
Figure 2
Figure 3a~3d
AI summary
The invention relates to a method for actuating a hydraulic transmission actuator assembly, in which a volume flow source (8) is connected to at least one hydraulic cylinder (16, 17) via a pressure line (6) which is filled with a hydraulic fluid, wherein a volume of the hydraulic fluid is regulated by means of the volume flow source (8). In a method in which the dynamics of the actuation of a hydraulic transmission actuator assembly are improved, regulation is carried out as a combined travel and angle regulation process (25, 26) of the volume flow source (8), wherein the travel regulation process (24) and the angle regulation process (26) are cross-faded with another.