Hydraulic Pump Torque Limiting for Heavy Machinery
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Solution Overview
Problem
Existing systems for limiting torque load in hydraulic cylinder systems of heavy machinery, such as dozers and excavators, often result in operator frustration and productivity loss due to continuous slowing of implements near stop points, as they operate without determining when to turn off the limiting mechanism.
Innovation Solution
A method and system that determine the speed of a power source and the position of an implement system, generating a signal to adjust the hydraulic pump flow based on these parameters, reducing the flow when the power source speed falls below a threshold and the implement approaches a stop point, thereby reducing torque load and velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hydraulic pump flow is continuously limited near stop points, then torque load and damage are reduced, but operator productivity and implement speed are degraded
Solution Approach 1:
The limiting mechanism is made dynamic by continuously monitoring power source speed and adjusting the hydraulic pump flow limitation accordingly. When power source speed indicates approaching a stop point, the system automatically reduces flow to the implement cylinder, preventing excessive torque loads while maintaining full speed during normal operation. This dynamic adjustment resolves the contradiction between protection and productivity.
2Object-affected harmful factors
If the limiting mechanism operates continuously, then cylinder impacts are prevented, but operator frustration increases due to unnecessary slowing
Solution Approach 1:
The system uses feedback from power source speed sensors to determine when limiting should be activated. By monitoring the deceleration of the power source, the system intelligently activates the flow limitation only when necessary to prevent cylinder impacts, rather than operating continuously. This feedback-based activation prevents unnecessary slowing that would frustrate operators while still providing protection when needed.
Data Source
AI summary
A method for reducing a torque load associated with an implement includes determining a speed associated with a power source, wherein the power source is configured to provide power to a hydraulic pump, determining a position associated with an implement system, and limiting a flow associated with the hydraulic pump based on the speed associated with the power source and the position associated with the implement system.