Hydraulic Pump Motor Control Using Load Feedback in Work Machines
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Solution Overview
Problem
Existing hydraulic pump control systems in work machines are inefficient and inappropriate due to reliance on operator input alone, leading to energy waste and noise pollution, without considering motor load or workload variations.
Innovation Solution
A work machine with a hydraulic actuator, manual operating tool, operation amount detector, hydraulic pump, electric pump motor, motor load detector, and pump motor controller that adjusts the hydraulic pump's output characteristic based on operator input, motor load, and workload to optimize drive control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the hydraulic pump is controlled based only on the operation amount of the manual operating tool, then the control system is simple, but the drive control becomes inappropriate and inefficient when the operator performs inappropriate operations
Solution Approach 1:
The pump motor controller receives feedback from the motor load detector about the actual load on the pump motor, and uses this feedback to adjust the drive control of the hydraulic pump. This closed-loop feedback mechanism allows the system to detect inappropriate operations and adjust accordingly, improving control appropriateness without requiring complex system architecture.
2Speed
If the hydraulic pump is driven only based on operator input, then the response is immediate, but energy is wasted and noise is generated due to inefficient drive
Solution Approach 1:
The motor load detector continuously monitors the actual load on the pump motor and provides feedback to the pump motor controller. This enables the controller to adjust the hydraulic pump's drive in real-time based on actual workload conditions, maintaining immediate response to operator input while eliminating energy waste by matching pump output to actual demand.
Solution Approach 2:
The system dynamically adjusts the drive control parameters of the hydraulic pump based on real-time motor load conditions. The pump motor controller modifies operational parameters such as speed and power output dynamically according to the detected workload, ensuring the pump operates efficiently at each moment rather than at fixed settings.
3Ease of operation
If the hydraulic pump is driven without considering motor load, then the system is simple to operate, but the hydraulic pump may be excessively driven due to inappropriate manual operation
Solution Approach 1:
The pump motor controller automatically monitors and adjusts the hydraulic pump drive based on motor load detector feedback without requiring operator intervention. The system self-regulates to prevent excessive driving by detecting actual workload conditions and adjusting pump output accordingly, maintaining operational simplicity while improving reliability through automated protection.
Data Source
AI summary
A work machine according to the present invention includes a manual operating tool configured to operate a hydraulic actuator; an operation amount detector configured to detect an operation amount of the manual operating tool; a hydraulic pump configured to generate a hydraulic pressure to be supplied to the hydraulic actuator; an electric pump motor configured to change an output characteristic of the hydraulic pump in response to a rotary force to be given to the hydraulic pump; a motor load detector configured to detect a motor load of the pump motor; and a pump motor controller configured to determine a necessary output characteristic based on the operation amount and the motor load and control the pump motor based on the output characteristic.