Electric Construction Machinery Power Control Under Battery Limits
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Solution Overview
Problem
Existing electric construction machinery lacks efficient control mechanisms to limit motor power usage to match available battery power, especially considering variations in battery temperature that affect output power.
Innovation Solution
The implementation of a vehicle control unit that connects to multiple inverter units and motors, allowing for real-time adjustment of power distribution based on battery temperature, usable power, and motor load, ensuring that motor power consumption remains within battery capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor power is increased to improve construction work performance, then the productivity is improved, but the power consumption exceeds the usable power of the battery
Solution Approach 1:
The system dynamically adjusts motor output power based on real-time battery temperature and usable power conditions. The vehicle control unit continuously monitors battery state and modifies motor power commands to ensure power consumption remains within available battery capacity, resolving the contradiction between maintaining high productivity and staying within energy limits.
Solution Approach 2:
The system changes operational parameters (motor power output) based on battery temperature and state of charge. By adjusting motor power according to battery conditions, the system optimizes the balance between construction work performance and power consumption, ensuring productivity is maximized within available energy constraints.
2Power
If the battery temperature increases to improve power output, then the usable power increases, but the battery reliability deteriorates
Solution Approach 1:
The vehicle control unit implements a feedback mechanism that continuously monitors battery temperature and adjusts motor power commands accordingly. When battery temperature rises, the system reduces power demand to prevent overheating and maintain battery reliability, while still attempting to deliver adequate power for construction work. This closed-loop control resolves the contradiction between maximizing power output and maintaining battery reliability.
3Ease of operation
If the power distribution is not controlled according to battery temperature, then the ease of operation is improved, but the loss of energy increases
Solution Approach 1:
The system automatically manages power distribution without requiring manual intervention. The vehicle control unit autonomously monitors battery temperature, calculates usable power, and adjusts motor power commands accordingly. This self-service approach maintains ease of operation while preventing energy waste through intelligent, temperature-based power management.
Data Source
AI summary
Electric construction machinery according to embodiments of the present disclosure includes a battery unit, a power distribution unit electrically connected to the battery unit. A plurality of inverter units electrically connected to the power distribution unit, a plurality of motors electrically connected to the plurality of inverter units, and a vehicle control unit that is electrically connected to each of the plurality of inverter units and transmits, to the inverter units, a control signal corresponding to an electrical signal received from an operation unit. In addition, the vehicle control unit detects usable power of the battery unit, and uses the control signal so as to control power supplied to the motors by the inverter units, and thus controls power required by the motors to be less than or equal to the usable power of the battery unit.