Nonlinear Control for Hydraulic Pump Torque Load Management
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Solution Overview
Problem
Conventional hydro-mechanical control systems for variable displacement hydraulic pumps are costly, complex, and prone to discontinuities due to linear control techniques, making it difficult to maintain total torque load within predetermined limits, which can lead to engine stalling.
Innovation Solution
A method and apparatus using nonlinear control laws to sense actual pump discharge pressure and displacement, determining pump displacement limits to control the total torque load of multiple variable displacement hydraulic pumps, ensuring continuous operation and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydro-mechanical control system is used to limit torque load, then the torque load can be controlled, but the system cost and complexity increase significantly
Solution Approach 1:
The patent replaces the hydro-mechanical control system with an electronic control system that uses sensors to detect pump displacement and pressure, and a microprocessor to calculate and control the torque load. This substitution eliminates the need for complex mechanical control components while achieving the same torque limiting function, thereby reducing system complexity and cost.
2Ease of operation
If linear control techniques are used in hydro-mechanical control design, then the controller can be synthesized, but the operating range is limited and discontinuities occur
Solution Approach 1:
The patent employs nonlinear control techniques that adapt to varying operating conditions by dynamically adjusting control parameters based on real-time sensor feedback. The microprocessor calculates the required pump displacement adjustments using nonlinear algorithms that account for the actual system state, enabling stable and precise torque load control across the entire operating range without the discontinuities associated with linear control methods.
Data Source
AI summary
Methods, apparatuses, and computer program products for controlling the torque load of multiple variable displacement hydraulic pumps are described herein. A pump displacement limit for each variable displacement hydraulic pump is determined using a nonlinear control law to limit the total pump torque load of the variable displacement hydraulic pumps on the engine. The value of the actual pump displacement of each variable displacement hydraulic pump is controlled based upon the respective determined pump displacement limit.