Trolley Power Allocation in Electric Work Vehicles
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Solution Overview
Problem
The conventional trolley power-receiving type fully electric dump truck requires significant increases in the size and weight of power reception devices due to increased power supply from trolley overhead wires, leading to reduced efficiency in work vehicles like electric dump trucks.
Innovation Solution
A work vehicle equipped with a power reception device, battery, electric motor, battery control device, motor control device, and power control device, which allocates charging and traveling power within the rated capacity of the power reception device to suppress size and weight increases, improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the power supplied from the trolley overhead wire to the power reception device is increased to improve traveling performance in the power receiving zone, then the traveling performance is improved, but the size and weight of the power reception device increase
Solution Approach 1:
The patent applies dynamics by making the power reception device's rated capacity adjustable rather than fixed. The controller dynamically changes the rated capacity of the power reception device based on the state of charge of the battery, allowing the system to adapt power reception limits to current operational needs and battery conditions, thereby improving traveling performance without permanently increasing device size or weight
Solution Approach 2:
The patent changes the parameter of rated capacity of the power reception device from a fixed value to a variable parameter that can be adjusted by the controller. By modifying the rated capacity parameter in response to battery state of charge, the system can optimize power reception to improve traveling performance while avoiding the need for a permanently larger and heavier power reception device
2Productivity
If the power supplied from the trolley overhead wire to the power reception device is increased to improve traveling performance in the power receiving zone, then the traveling performance is improved, but the size of the power reception device increases
Solution Approach 1:
The patent makes the power reception device's rated capacity dynamic rather than static. The controller adjusts the rated capacity based on battery state of charge, enabling the system to increase power reception capability when needed for improved traveling performance while maintaining a compact physical size of the power reception device
Solution Approach 2:
The patent changes the rated capacity parameter of the power reception device from fixed to variable. By adjusting this parameter in response to battery conditions, the system achieves improved traveling performance without requiring a physically larger power reception device, thus avoiding increased size
3Power
If the rated capacities of electrical devices in the power reception device are increased to supply both traveling power and charging power from the trolley overhead wire, then the power supply capability is improved, but the weight of the work vehicle increases
Solution Approach 1:
The patent applies dynamics by making the rated capacity of the power reception device adjustable. The controller dynamically sets the rated capacity based on battery state of charge, allowing the system to supply both traveling power and charging power when needed without permanently increasing the power reception device's rated capacity and associated weight
Solution Approach 2:
The patent changes the rated capacity parameter from fixed to variable. By adjusting the rated capacity parameter in response to battery conditions, the system can provide enhanced power supply capability for both traveling and charging without requiring permanently higher rated capacities that would necessitate heavier electrical devices
4Power
If the rated capacities of electrical devices in the power reception device are increased to supply both traveling power and charging power from the trolley overhead wire, then the power supply capability is improved, but the efficiency of work is reduced
Solution Approach 1:
The patent makes the power reception device's rated capacity dynamic, allowing the controller to adjust it based on battery state of charge. This enables the system to optimize power supply capability for both traveling and charging while avoiding the permanent size and weight increases that would reduce work efficiency
Solution Approach 2:
The patent changes the rated capacity parameter from fixed to variable, allowing the system to provide enhanced power supply capability when needed while maintaining a compact power reception device that does not reduce work efficiency through increased size and weight
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively limits the size and weight of power reception devices, enhancing the efficiency of work vehicles by optimizing power allocation from trolley overhead wires.
Implementation Method 1
a battery 120 configured to be charged by the power supplied from the power reception device 110
Implementation Method 2
an electric motor for traveling 130 configured to be driven by power supplied from the power reception device 110 or the battery 120
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Provided is a work vehicle with which it is possible to suppress an increase in the size and weight of a power reception device that supplies power supplied from a trolley overhead wire to a battery and an electric motor, and to improve the efficiency of work including transportation work. A work vehicle (100) comprises a battery control device (140) that controls charging power supplied from a power reception device (110) to a battery (120), a motor control device (150) that controls traveling power supplied from the power reception device (110) to an electric motor (130), and a power control device (160) that calculates allocations of the charging power and the traveling power with respect to received power of the power reception device (110) within a range in which the total of the charging power and the traveling power does not exceed a rated capacity of the power reception device (110) and controls the battery control device (140) and the motor control device (150) such that the allocated powers are supplied from the power reception device (110) to the battery (120) and the electric motor (130).