Multi-Function Hydraulic Control with Dynamic Scaling of Valve Commands
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Solution Overview
Problem
Hydraulic systems face challenges in accurately controlling multiple functions simultaneously, as existing technologies struggle to maintain proportional relationships between target rates and achievable rates, leading to inefficiencies and errors in dynamic responses.
Innovation Solution
A hydraulic control system and method that utilize a controller to receive input target commands for multiple functions, determine achievable rates, and map these to output commands for electrohydraulic valves, ensuring proportional relationships and adjusting for dynamic responses through transient command shaping to maintain accurate and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional lookup table control is used for multiple hydraulic functions, then the control system is simple to implement, but the proportional relationship between target rates and achievable rates cannot be maintained accurately
Solution Approach 1:
The patent implements dynamic scaling factors that are continuously adjusted based on the current state of the hydraulic system and the desired target rates. Unlike static lookup tables, the scaling factors are computed in real-time to maintain accurate proportional relationships between target rates and achievable rates across varying operating conditions, thereby resolving the contradiction between precision and complexity.
Solution Approach 2:
The system changes the parameters of the control approach by introducing computable scaling factors that modify the relationship between target commands and valve actuation signals. This parameter-based dynamic adjustment allows the system to maintain proportional accuracy without requiring a complex multi-dimensional lookup table, thus balancing precision requirements with system simplicity.
2Reliability
If target commands are directly applied to electrohydraulic valves, then the response is fast, but errors occur when functions have different transient characteristics
Solution Approach 1:
The patent applies preliminary scaling to target commands before they are sent to the electrohydraulic valves. By pre-computing the appropriate scaling factors based on the known transient characteristics of each function, the system prepares adjusted commands in advance that account for differences in response times, ensuring accurate control without requiring corrective actions after the fact.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor the actual performance of each hydraulic function and use this information to dynamically adjust scaling factors. This closed-loop approach allows the system to maintain control accuracy by continuously adapting to variations in transient characteristics while preserving fast response times through intelligent prediction and adjustment.
3Measurement precision
If different scaling factors are used for functions with different transient characteristics, then control accuracy is improved, but the control algorithm becomes more complex
Solution Approach 1:
The patent applies local quality by assigning specific scaling factors to individual hydraulic functions based on their unique transient characteristics. Each function receives a tailored scaling factor that accounts for its specific response behavior, while the overall control algorithm remains relatively simple through modular implementation. This localized approach maintains precision without requiring a complete redesign of the control system.
Data Source
AI summary
Systems and methods for control of multi-function hydraulic commands of a multi-function electrohydraulic system are provided. In one aspect, a system for hydraulic control includes a first function in fluid communication with a first electrohydraulic control valve and a second function in fluid communication with a second electrohydraulic control valve. The system includes a controller in communication with the first electrohydraulic control valve and the second electrohydraulic control valve. The controller can be configured to receive an input target command, determine an achievable function rate based on the input target command, where the achievable function rate maintains a proportional relationship between the input target command and the achievable function rate. The controller can also map the achievable function rate to an output command based on a predetermined relationship between the achievable function rates and the output commands and supply the output command to the first and second electrohydraulic valves.