Hydraulic Load Braking With Fluid Resistor Energy Dissipation
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Solution Overview
Problem
Work vehicles face inefficiencies in energy management and braking systems, particularly when the battery is fully charged or at extreme temperatures, leading to ineffective energy dissipation and speed control.
Innovation Solution
A hydraulic system with a pump, conduits, a fluid resistor, and a valve controlled by a controller that monitors the battery state of charge, directing hydraulic fluid either to attachments for movement or through a fluid resistor for energy dissipation, providing motor braking by converting kinetic energy into chemical energy or dissipating excess power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery is fully charged or at extreme temperatures, then the battery cannot receive further charge, but the work vehicle still needs to dissipate energy and control speed
Solution Approach 1:
The patent introduces a fluid resistor as an intermediary component between the hydraulic pump and the reservoir. When the battery cannot accept charge, the controller redirects hydraulic fluid through the fluid resistor, which dissipates excess energy as heat through fluid flow resistance, thereby providing an alternative energy dissipation path that maintains system adaptability.
Solution Approach 2:
The system changes the operational parameters of the hydraulic system by switching the valve position based on battery state. When battery charging is not possible, the system changes from charging mode to energy dissipation mode, adjusting the hydraulic circuit configuration to route fluid through the fluid resistor, thus adapting to different operational conditions.
2Ease of operation
If hydraulic fluid is directed to the attachment for movement, then the attachment can be operated, but excess energy from the work vehicle is not dissipated
Solution Approach 1:
The system dynamically switches between two operational modes using a controllable valve. The valve can direct hydraulic fluid either to the attachment for productive work or through the fluid resistor for energy dissipation. This dynamic switching capability allows the system to optimize between attachment operation and excess energy management based on real-time conditions.
Solution Approach 2:
The hydraulic system is designed with multi-functionality, where the same hydraulic pump and control system can serve dual purposes: powering attachment operations or dissipating excess energy through the fluid resistor. This universal design allows the system to handle both productive work and energy management functions within a single integrated framework.
3Loss of energy
If a fluid resistor is added to dissipate energy, then energy management is improved, but the hydraulic system complexity increases
Solution Approach 1:
The patent merges the energy dissipation function into the existing hydraulic system by integrating the fluid resistor as an additional component in the hydraulic circuit. The fluid resistor is connected in parallel with the attachment circuit, allowing the system to combine productive work and energy dissipation functions without requiring separate braking systems or energy management infrastructure.
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 system effectively manages battery charge and provides controlled braking by converting kinetic energy into chemical energy or dissipating power, optimizing speed control and energy usage in work vehicles.
Implementation Method 1
a fluid resistor fluidly connected with the second conduit, the fluid resistor that dissipates power from the work vehicle
Data Source
AI summary
A hydraulic system for a work vehicle that has a frame, a ground-engaging implement that moves the frame over a ground surface, and an attachment connected to the frame for movement with respect to the frame. The hydraulic system includes a pump that pumps hydraulic fluid, a first conduit fluidly connecting the pump and the attachment, a reservoir that contains hydraulic fluid, a second conduit fluidly connecting the pump to the reservoir, a fluid resistor fluidly connected with the second conduit, and a valve. The fluid resistor dissipates power from the work vehicle. The valve actuates between a first state in which the valve fluidly connects the pump to the first conduit such that hydraulic fluid is directed to the attachment, and a second state in which the valve fluidly connects the pump to the second conduit such that fluid is directed through the fluid resistor and into the reservoir.