Excavator Pump Torque Distribution Using Joystick Demand
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Solution Overview
Problem
Construction machines like excavators face challenges in distributing available torque effectively among multiple hydraulic pumps to meet varying operational demands, leading to inefficient performance during complex operations.
Innovation Solution
A construction machine with a control unit that adjusts the torque distribution ratio between multiple pumps based on the operation amounts of joysticks controlling different actuators, ensuring appropriate torque allocation to meet user intentions, even when the sum of required torque exceeds available torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the available torque is distributed to multiple hydraulic pumps according to fixed factors, then the system maintains stable operation, but the torque distribution cannot adapt to varying operational demands leading to inefficient performance
Solution Approach 1:
The torque distribution ratio is made dynamic rather than fixed. The control unit continuously adjusts the torque distribution ratio based on real-time operation amounts of joysticks and required torque of each pump, enabling the system to adapt to varying operational demands dynamically
Solution Approach 2:
The system implements feedback control by monitoring the operation amounts of joysticks and the required torque of each hydraulic pump, then using this information to adjust the torque distribution ratio. This closed-loop control ensures optimal torque allocation while maintaining system stability
2Ease of operation
If the torque distribution ratio is adjusted dynamically based on operation amounts, then the system meets user operation intention precisely, but the control complexity increases
Solution Approach 1:
The control system automatically determines the torque distribution ratio based on joystick operation amounts and pump requirements without manual intervention. The system self-adjusts to meet user operation intentions by monitoring operational parameters and making real-time torque allocation decisions
3Productivity
If the sum of required torque exceeds available torque, then the system must prioritize torque allocation, but some operations may be performed slowly or not at all without proper distribution
Solution Approach 1:
The system changes the torque distribution ratio parameter based on operational requirements. When the sum of required torque exceeds available torque, the control unit adjusts the distribution ratio to prioritize critical operations, ensuring both productivity and reliability by allocating torque to operations that need it most
Data Source
AI summary
Disclosed are a construction machine and a method of controlling a construction machine. The construction machine includes: a first pump and a second pump; an engine which provides available torque to the first pump and the second pump; a first joystick and a second joystick which control actuators operated by a working fluid discharged from the first pump and the second pump; a joystick operation amount acquiring unit which acquires operation amounts of the first joystick and the second joystick; and a control unit which adjusts a torque distribution ratio with respect to the first pump and the second pump in accordance with the operation amounts of the first joystick and the second joystick when a sum of required torque of the first pump and required torque of the second pump is higher than the available torque.