Fluidic Mass Control for Haptic Actuators
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Solution Overview
Problem
Traditional haptic feedback systems using constant pressure control fail to achieve the full range of forces and suffer from poor response latency, limiting their ability to provide natural and realistic force feedback to users.
Innovation Solution
Implementing constant fluid mass control in haptic feedback systems, which involves a fluidic mass regulator controlling the amount of fluid in actuators using supply and exhaust valves to trap a constant mass of fluid, allowing for faster and more precise changes in actuator pressure, thereby enhancing dynamic range and reducing response latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If constant pressure control is used in haptic feedback systems, then the system is simpler to control, but the dynamic range of forces and response latency are limited
Solution Approach 1:
The system transitions from constant pressure control to constant fluid mass control by changing the controlled parameter from pressure to fluid mass. This allows the actuator to achieve a wider dynamic range of forces while maintaining controllable operation through closed-loop feedback that monitors and adjusts fluid mass delivery.
Solution Approach 2:
The patent implements closed-loop control using pressure sensors to monitor actuator pressure and feedback controllers to adjust fluid delivery. This feedback mechanism enables precise control of fluid mass, allowing the system to achieve faster response times and wider dynamic range while maintaining ease of operation through automated control adjustments.
2Device complexity
If constant pressure control is used in haptic feedback systems, then the control mechanism is simpler, but the response latency is poor
Solution Approach 1:
By changing the controlled parameter from pressure to fluid mass, the system achieves faster response latency. The constant fluid mass control approach allows for more precise and rapid adjustment of actuator forces, reducing the time delay between control input and actuator response while managing complexity through feedback control.
Solution Approach 2:
The closed-loop feedback system using pressure sensors and feedback controllers enables real-time monitoring and adjustment of fluid mass delivery. This feedback mechanism reduces response latency by automatically detecting pressure changes and adjusting fluid delivery accordingly, achieving faster response times without excessively increasing control mechanism complexity.
3Productivity
If constant fluid mass control is implemented, then the dynamic range of forces and response times improve, but the system complexity increases
Solution Approach 1:
The patent uses closed-loop feedback control with pressure sensors and feedback controllers to manage the complexity of constant fluid mass control. The feedback system automatically monitors actuator pressure and adjusts fluid delivery to maintain constant fluid mass, achieving fast response times while keeping system complexity manageable through automated control rather than manual intervention.
Solution Approach 2:
The system implements self-regulating control where the feedback controller automatically adjusts fluid delivery based on pressure sensor feedback. This self-service approach allows the system to maintain constant fluid mass control and achieve improved response times without requiring complex external control mechanisms, as the system self-corrects through its own feedback loop.
4Adaptability or versatility
If constant fluid mass control is implemented, then the dynamic range of forces expands, but the control system becomes more complex
Solution Approach 1:
The system achieves an expanded dynamic range of forces by changing from constant pressure to constant fluid mass control. The feedback control system manages the increased complexity by automatically adjusting fluid delivery parameters based on real-time pressure feedback, enabling the actuator to produce a wider range of forces while keeping the control system manageable through automated parameter adjustment.
Solution Approach 2:
The closed-loop feedback control system enables the actuator to achieve an expanded dynamic range of forces by continuously monitoring pressure and adjusting fluid mass delivery. The feedback mechanism manages control system complexity by automatically adapting control parameters to maintain optimal performance across the wider force range, reducing the need for manual intervention and simplifying operation despite the enhanced capabilities.
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 enables haptic devices to achieve a wider dynamic range of forces and faster response times, providing more natural and realistic force feedback to users by maintaining a constant fluid mass within the actuator, improving the overall haptic experience.
Implementation Method 1
Implementing constant fluid mass control in haptic feedback systems, which involves a fluidic mass regulator controlling the amount of fluid in actuators using supply and exhaust valves to trap a constant mass of fluid
Implementation Method 2
activate the supply valve to fill the actuator with an amount of the fluid
Implementation Method 3
place the exhaust valve in a state that prevents a fluid from escaping the actuator
Implementation Method 4
determine that the actuator has filled with the amount of the fluid
Data Source
AI summary
The disclosed haptic feedback system may include an actuator, a supply valve coupled to the actuator, an exhaust valve, and a fluidic mass controller communicatively coupled to the supply valve and the exhaust valve. The fluidic mass controller may (1) place the exhaust valve in a state that prevents a fluid from escaping the actuator, (2) activate the supply valve to fill the actuator with an amount of the fluid, (3) determine that the actuator has filled with the amount of the fluid, and then in response to that determination, (4) deactivate the supply valve to trap the amount of the fluid in the actuator. Various other apparatuses, methods, and systems are also disclosed.