Three-Chamber Hydraulic Valve Architecture for Isolated Pressure Rail Control
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Solution Overview
Problem
Existing hydraulic architectures for heavy machinery face challenges in achieving precise motion control while minimizing energy losses and system complexity, particularly due to the limitations of two-pressure rail systems which result in reduced discretized force levels and increased throttling losses.
Innovation Solution
A novel three-chamber cylinder hydraulic architecture with three hydraulic pressure rails and a valve arrangement that includes proportional valves, on-off valves, and check valves, allowing for independent chamber pressure control and isolated flow from pressure rails without short circuits, thereby enabling precise pressure control and efficient energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a two-pressure rail system is used, then system complexity is reduced, but the number of discretized force levels decreases and throttling losses increase
Solution Approach 1:
The hydraulic system is segmented into three independent pressure rails (high, medium, low pressure) instead of using a two-pressure rail system. Each pressure rail can be independently controlled and supplied, allowing for finer discretization of force levels. The valve arrangement is also segmented with dedicated on-off valves and proportional valves for each pressure rail, enabling precise control without excessive throttling losses.
2Adaptability or versatility
If the number of pressure rails is increased to three, then the number of discretized force levels increases, but system complexity increases
Solution Approach 1:
The system segments the hydraulic control into three distinct pressure rails with dedicated valve controls for each, allowing independent management of high, medium, and low pressure supplies. This segmentation enables flexible combination of pressure levels with cylinder chambers to achieve 27 discretized force levels (3 pressure rails × 3 chambers) while keeping each control module relatively simple and modular.
Solution Approach 2:
The system dynamically switches between different pressure rails and chamber combinations based on the required force level. The controller can select from multiple discrete modes by activating different combinations of on-off valves and proportional valves, providing adaptability without requiring a fully continuous control system, thus balancing versatility with manageable complexity.
3Device complexity
If multiple hydraulic actuators share the same hydraulic supply, then system complexity is reduced, but energy efficiency decreases due to throttling control requirements
Solution Approach 1:
Instead of using a single shared hydraulic supply, the system segments the power supply into three independent pressure rails. Each actuator can draw from the most appropriate pressure level for its current load requirement, eliminating the need for throttling to reduce pressure from a single high-pressure source. This segmentation allows multiple actuators to operate efficiently simultaneously at different pressure levels.
Solution Approach 2:
Each pressure rail is optimized for specific load ranges, with the high-pressure rail for heavy loads, medium-pressure for moderate loads, and low-pressure for light loads. This local optimization ensures that each actuator receives hydraulic power with quality (pressure level) matched to its specific requirements, minimizing energy losses while maintaining system simplicity through modular valve controls.
4Stress or pressure
If throttling control is used to match supply pressure to actuator requirements, then pressure matching is achieved, but power losses increase
Solution Approach 1:
The hydraulic supply is segmented into three discrete pressure rails (high, medium, low) that can be selectively activated. Instead of using throttling to continuously adjust pressure from a single high-pressure source, the system switches between discrete pressure levels using on-off valves. This eliminates or minimizes throttling losses while maintaining adequate pressure matching for different actuator load requirements.
Solution Approach 2:
The system dynamically switches between different pressure rails based on the instantaneous load requirements of actuators. The controller monitors actuator demands and activates the appropriate pressure rail (high, medium, or low) to match the required pressure level, avoiding the continuous throttling that would be needed with a single pressure source. This dynamic switching maintains pressure matching while minimizing power losses.
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 proposed solution achieves a higher number of discretized force levels with reduced system complexity and energy losses, allowing for precise motion control in heavy machinery without significant increases in system losses or design complexity.
Implementation Method 1
hydraulic pressure within the cylinder and the effective area of a piston moving within the cylinder resulting in a load force
Implementation Method 2
at least 3·N−M proportionally controlled hydraulic valves coupled to the hydraulic linear actuator
Implementation Method 3
the on-off valves and the check valves on the supply side of each of the N proportional valves cooperate to prevent fluid flow between a hydraulic rail port with a first pressure to a hydraulic rail port with a second pressure, wherein the first pressure is higher than the second pressure
Implementation Method 4
a three-chamber cylinder hydraulic architecture... achieving a higher number of discretized force levels
Implementation Method 5
hydraulic pressure within the cylinder and the effective area of a piston moving within the cylinder resulting in a load force
Data Source
AI summary
A hydraulic circuit is disclosed which includes one or more i) linear; or ii) rotary hydraulic actuator, wherein total number of cylinder chambers is N, M pressure rails, a valve arrangement, including M hydraulic rail ports each coupled to a pressure rail, N hydraulic chamber ports each coupled to a chamber of one or more actuators, N proportional valves each corresponding to one of the N hydraulic chamber ports, X sets of on-off valves and check valves coupling two or more hydraulic rail ports to each of supply sides of each of the N proportional valves, and Y sets of on-off valves and check valves coupling two or more hydraulic rail ports to each of return sides of each of the N proportional valves, and a controller configured to in real-time operate the N proportional valves and the associated on-off valves to achieve one or more desired functional parameters.