Hydraulic Electric Working Machine Idle Speed Control
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Solution Overview
Problem
Electric working machines waste power when the electric motor continues to run unattended, leading to decreased efficiency.
Innovation Solution
Incorporating a controller that adjusts the electric motor's rotation speed based on the hydraulic fluid temperature and operational state, allowing for idling or stopping the motor when not in use, and adjusting power consumption modes to optimize energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric motor continues to be rotationally driven when the working device is not actuated, then the hydraulic device remains ready for operation, but electric power is wasted and working efficiency decreases
Solution Approach 1:
The patent implements dynamic motor speed adjustment based on operational conditions. The controller monitors the actuation state of the working device and automatically adjusts the electric motor's rotation speed between a first rotation speed (when working device is actuated) and a second rotation speed (when working device is not actuated). This dynamic adaptation resolves the contradiction by maintaining hydraulic system readiness through continued motor operation at reduced speed while significantly lowering electric power consumption during idle periods.
2Use of energy by moving object
If the electric motor is stopped when the working device is not actuated, then electric power consumption is reduced, but the hydraulic device cannot respond immediately when needed
Solution Approach 1:
The patent applies preliminary action by maintaining the electric motor in a standby state at the second rotation speed when the working device is not actuated. This keeps the hydraulic device primed and ready for immediate operation without requiring a full motor shutdown. The motor continues to drive the hydraulic pump at a reduced rate, ensuring hydraulic fluid circulation and system readiness, thereby eliminating startup delays while consuming minimal power compared to full-speed continuous operation.
3Productivity
If the electric motor operates at high rotation speed continuously, then the hydraulic device can perform work immediately, but electric power consumption increases
Solution Approach 1:
The patent implements parameter changes by dynamically adjusting the electric motor's rotation speed parameter based on the operational state of the working device. When the working device is actuated, the motor operates at the first rotation speed to ensure full work performance capability. When the working device is not actuated, the controller reduces the motor speed to the second rotation speed, significantly lowering electric power consumption while maintaining the hydraulic system in a ready state. This parameter adaptation resolves the contradiction between productivity and energy consumption.
Data Source
AI summary
An electric working machine includes an electric motor drivable by electric power from a battery on a machine body, a hydraulic device actuatable by power from the electric motor, a working device actuatable by hydraulic pressure of hydraulic fluid supplied from the hydraulic device, a switch switchable between a first position to permit actuation of the working device and a second position to not permit actuation of the working device, and a fluid temperature detector to detect a temperature of hydraulic fluid. While the electric motor is driven, when the switch is switched to the second position and the temperature of hydraulic fluid is within an allowable temperature range that is neither in a low temperature state nor a high temperature state, a controller is configured or programmed to control a rotation speed of the electric motor to a predetermined first rotation speed corresponding to a stopped state of the electric motor.