Excavator Auxiliary Pipeline Flow Control Under Pressure Distortion
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Solution Overview
Problem
Excavators fail to accurately control the pressure and flow of auxiliary pipelines due to distortion caused by factors like overflow valves, leading to potential damage to the main pump and other hydraulic components.
Innovation Solution
A control method and device that acquires pressure differences between the input and output ends of the auxiliary pipeline, uses a relationship model to calculate the output flow, and adjusts the flow to be within a target range by controlling the main pump's output flow based on pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the excavator uses an auxiliary pipeline with overflow valves, then the auxiliary devices can operate with different pressure and flow requirements, but the pressure and flow are greatly distorted and inaccurate
Solution Approach 1:
The patent implements a feedback control system that continuously monitors the actual flow in the auxiliary pipeline and compares it with the target flow. The controller adjusts the proportional valve opening based on the flow difference to maintain accurate flow control despite the presence of overflow valves and varying pressure conditions.
Solution Approach 2:
The patent replaces mechanical flow estimation methods with electronic sensors and control systems. Flow sensors and pressure sensors provide real-time data to an electronic controller that calculates actual flow and adjusts valve openings electronically, eliminating the inaccuracies of pure mechanical systems.
2Device complexity
If the pressure sensor is placed far away from the actuator, then the system structure is simpler, but the pressure and flow are greatly distorted
Solution Approach 1:
The patent introduces multiple pressure sensors positioned at different locations in the hydraulic system as intermediaries. These sensors measure pressure at various points, and the controller uses this distributed data to calculate accurate flow values, compensating for the distance between sensors and actuators.
3Device complexity
If the excavator does not detect the actual flow, then the system is simpler, but the main pump or hydraulic components may be damaged
Solution Approach 1:
The patent implements comprehensive feedback from flow sensors, pressure sensors, and valve current sensors to the controller. This feedback loop enables real-time monitoring of actual flow conditions, allowing the system to detect anomalies and adjust operations to prevent damage to the main pump and hydraulic components.
Solution Approach 2:
The patent performs preliminary calculations of target flow based on actuator requirements before actual operation. The controller pre-determines the appropriate valve openings and flow rates needed, and continuously adjusts them based on sensor feedback, preventing conditions that could lead to component damage.
Data Source
AI summary
Disclosed are a control method and a control device for an auxiliary pipeline of an excavator, a working machine and an electronic apparatus. The control method for the auxiliary pipeline of the excavator includes: acquiring a pressure difference between an input end and an output end of the auxiliary pipeline of the excavator; obtaining an output flow of the auxiliary pipeline based on the pressure difference; and controlling the output flow of the auxiliary pipeline to adjust to be within a target flow range when the output flow of the auxiliary pipeline is beyond the target flow range. The control method for the auxiliary pipeline of the excavator according to the present application can solve the defect of relatively large pressure and flow distortion of the auxiliary pipeline in the related art, and realize an accurate control to the input and output of the flow of the auxiliary pipeline.