Power Split Transmission Control for Stable Multi-Output Supply
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Solution Overview
Problem
Current power split transmission systems in construction and agricultural machines require additional components and reduce efficiency due to the need for a secondary on-board electrical system at higher nominal voltage, leading to increased costs and reduced overall efficiency.
Innovation Solution
A power split transmission structure with at least two variator paths, each comprising a mechanical and an electrical path, using power electronics or hydraulic control devices to regulate and modify torque and speed, allowing for compensation of power fluctuations through electric or hydraulic machines, thereby directing drive power to multiple outputs efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a second on-board electrical system at higher nominal voltage is added to drive electric consumers, then the power supply capability for electric consumers is improved, but the device complexity and cost increase due to additional generator system components
Solution Approach 1:
The existing generator system is designed to serve multiple functions: it generates electrical power for the original on-board electrical system and simultaneously drives the hydraulic pump for the hydrostatic transmission. This eliminates the need for a separate dedicated generator for hydraulic power, reducing component count and system complexity while maintaining the ability to supply both electrical and hydraulic consumers
Solution Approach 2:
The invention combines the electrical power generation and hydraulic power generation functions into a single integrated system. The generator is coupled to drive both the electrical load and the hydraulic pump, merging two separate power supply paths into one unified system that reduces overall complexity
2Power
If a second on-board electrical system at higher nominal voltage is added to drive electric consumers, then the power supply capability for electric consumers is improved, but the overall efficiency decreases due to additional components
Solution Approach 1:
The invention combines the electrical power generation and hydraulic power generation functions into a single integrated system. The generator is coupled to drive both the electrical load and the hydraulic pump, merging two separate power supply paths into one unified system that reduces overall complexity
3Power
If additional components are added to provide power for electric consumers, then the power supply capability is improved, but the component size and weight increase
Solution Approach 1:
The existing generator system is designed to serve multiple functions: it generates electrical power for the original on-board electrical system and simultaneously drives the hydraulic pump for the hydrostatic transmission. This eliminates the need for a separate dedicated generator for hydraulic power, reducing component count and system complexity while maintaining the ability to supply both electrical and hydraulic consumers
4Power
If additional components are added to provide power for electric consumers, then the power supply capability is improved, but the maintenance complexity increases
Solution Approach 1:
The existing generator system is designed to serve multiple functions: it generates electrical power for the original on-board electrical system and simultaneously drives the hydraulic pump for the hydrostatic transmission. This eliminates the need for a separate dedicated generator for hydraulic power, reducing component count and system complexity while maintaining the ability to supply both electrical and hydraulic consumers
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 proposed solution increases overall efficiency by reducing the need for additional components, enabling flexible adaptation to changing conditions and ensuring consistent power supply to connected consumers, while minimizing component size and weight, and reducing maintenance complexity.
Implementation Method 1
at least three electric or hydraulic machines arranged in parallel with the summation gearbox of each variator path downstream of the interfaces
Implementation Method 2
a hydraulic control device including at least three electric or hydraulic machines arranged in parallel with the summation gearbox
Data Source
AI summary
A method controls a power split transmission structure to direct drive power from a drive through at least three interfaces to at least one output to supply connected consumers. The transmission structure has at least two variator paths each comprising a summation gearbox downstream of the interfaces in which drive power is varied via a mechanical and an electrical path. The transmission structure has power electronics or a hydraulic control device including at least three electric or hydraulic machines arranged in parallel with the summation gearbox of each variator path downstream of the interfaces. The method simultaneously controls the power electronics or a hydraulic control device and the electric or hydraulic machines in such a way that fluctuations in the power supply to the consumers are compensated for by the electric or hydraulic machines by regulating, via a control device, the summation gearbox of each of the variator paths and modifying a torque, a speed, or both, of the drive power via the power electronics system or the hydraulic control device.