Hydraulic Regenerative Braking Layout for Mine Work Vehicles
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Solution Overview
Problem
In open pit mines, large dump trucks require significant retarder grids to convert regenerative electric power into heat for braking, which occupy space and hinder the integration of other components like hydrogen tanks, necessitating a reduction in retarder grid size and energy consumption.
Innovation Solution
A work vehicle equipped with an electric motor, hydraulic oil tank, hydraulic pump driven by regenerative electric power, and an accumulator to accumulate hydraulic pressure, allowing for efficient consumption of regenerative energy and reducing the size of the retarder grid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a large retarder grid is used to consume regenerative electric power, then braking force is improved, but the available space on the platform is reduced
Solution Approach 1:
The patent introduces a hydraulic pump driven by regenerative electric power to drive hydraulic oil into an accumulator, creating hydraulic pressure that generates braking force. This hydraulic system replaces the need for a large retarder grid, reducing the space required on the platform while maintaining effective braking capability through the hydraulic pressure mechanism.
2Area of stationary object
If the size of the retarder grid is reduced, then the available space on the platform is increased, but the ability to consume regenerative electric power is reduced
Solution Approach 1:
The hydraulic pump and accumulator system efficiently consumes regenerative electric power by converting it into hydraulic pressure energy. The pump drives hydraulic oil into the accumulator, storing energy that can be used for braking. This hydraulic energy storage mechanism provides an effective alternative to the retarder grid for consuming regenerative power while freeing up platform space.
Solution Approach 2:
The system changes the form of energy storage from electrical (retarder grid) to hydraulic (pressurized oil in accumulator). By transforming the energy consumption mechanism from direct electrical resistance heating to hydraulic pressure accumulation, the system achieves the same energy consumption goal with reduced spatial requirements.
3Area of stationary object
If regenerative electric power is not consumed, then the retarder grid size can be minimized, but energy is wasted
Solution Approach 1:
The hydraulic pump and accumulator system captures and stores regenerative electric power as hydraulic pressure energy. Instead of wasting regenerative power or requiring a large retarder grid, the system converts the electrical energy into mechanical hydraulic pressure that can be stored and reused, achieving both energy conservation and space efficiency.
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 vehicle effectively consumes regenerative electric power through hydraulic pressure accumulation and heat conversion, minimizing the size of the retarder grid and enabling space for other components, such as hydrogen tanks, on the vehicle platform.
Implementation Method 1
a hydraulic pump configured to be driven by regenerative electric power of the electric motor, which is generated by braking of the traveling body, and to pump the hydraulic oil in the hydraulic oil tank
Implementation Method 2
an accumulator configured to accumulate the pressure of the hydraulic oil pumped from the hydraulic pump
Data Source
AI summary
A work vehicle includes an electric motor, a traveling body, a hydraulic oil tank, and a hydraulic pump, and an accumulator. The hydraulic pump is driven by regenerative electric power of the electric motor, which is generated by braking of the traveling body, and pumps a hydraulic oil in the hydraulic oil tank. The accumulator accumulates the pressure of the hydraulic oil pumped from the hydraulic pump.