Multi-mode Infinitely Variable Transmission for Work Vehicles
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Solution Overview
Problem
Existing vehicle transmission systems, particularly those using infinitely variable transmissions, face challenges such as power inefficiencies, increased wear on components, and transient power events that lead to jolts or lags during shifts, especially in heavy-duty applications where power is split between mechanical and infinitely variable paths.
Innovation Solution
A multi-mode infinitely variable transmission (MIVT) system that utilizes planetary and double planetary gear sets, along with clutches and brakes, to selectively use mechanical and electrical power paths, allowing for seamless transitions between powered-zero, creeper, and split-path drive modes, reducing the need for excessive IVP speeds and minimizing wear on components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transmission shifts are performed in conventional transmission systems, then gear ratio transitions are achieved, but jolts and lags occur during shifts causing detrimental effects on system performance and user experience
Solution Approach 1:
The system dynamically switches between mechanical power path and infinitely variable power path (IVP) during transmission shifts. The controller monitors shift events and temporarily increases IVP speed to provide continuous power delivery, eliminating the jolts and lags associated with conventional mechanical shifts. This dynamic power path switching ensures smooth transition while maintaining adaptability across different operating conditions.
2Power
If higher IVP speeds are used to improve power delivery, then power availability increases, but wear on components increases and power efficiency decreases
Solution Approach 1:
The controller dynamically adjusts IVP speed based on real-time power demands and operating conditions. During transient power events or high-demand situations, the IVP speed is temporarily increased to provide necessary power. During steady-state operation, the IVP speed is reduced to minimize wear and improve efficiency. This dynamic speed modulation resolves the contradiction between power availability and energy loss.
3Loss of energy
If mechanical path is utilized more heavily, then power transmission efficiency improves, but the benefits of infinitely variable power are reduced
Solution Approach 1:
The system dynamically switches between mechanical power path and infinitely variable power path based on operating conditions. During steady-state operation where efficiency is paramount, the mechanical path is utilized heavily. During transient power events, acceleration, or when infinite variability is needed, the IVP path is engaged. This dynamic path switching maintains both high efficiency and adaptability across different operating scenarios.
4Device complexity
If conventional transmission systems are used, then structural simplicity is maintained, but power inefficiencies and component wear increase
Solution Approach 1:
The system merges a conventional mechanical transmission path with an infinitely variable power path (IVP) that includes an electric machine. The mechanical path provides efficient power transmission, while the IVP path provides adaptability and supplements power during transient events. The controller intelligently switches between paths to optimize efficiency. This merging resolves the contradiction by maintaining structural simplicity while improving power efficiency through selective use of the IVP.
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 MIVT system enhances power transmission efficiency, reduces wear on components, and provides smooth operation by allowing heavier utilization of the mechanical path while maintaining the benefits of infinitely variable power, thus improving the overall performance and longevity of the transmission system.
Implementation Method 1
an energy storage device configured to receive energy from the IVP for storage and to provide stored energy from the energy storage device to power one or more components of the IVP
Data Source
AI summary
A power train arrangement for a work vehicle with an engine may include an infinitely variable power source (“IVP”). An energy storage device may be configured to receive energy from the IVP for storage and to provide stored energy from the energy storage device to power one or more components of the IVP. A transmission may be configured to relay power from the engine and from the one or more components of the IVP to other components of the vehicle. A transient power event may be identified, during which a present operating state of the engine does not provide sufficient power for operations of the work vehicle. The energy storage device may be caused to provide stored energy to power the one or more components of the IVP source and thereby to provide power to the transmission.