Multi-mode Infinitely Variable Transmission Seamless Shifting
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Solution Overview
Problem
Infinitely variable powertrains face challenges in efficiently transmitting power across various modes, leading to issues like excessive wear on components and the need for high IVP speeds, which can result in part failure and increased costs, particularly in heavy-duty applications.
Innovation Solution
A multi-mode infinitely variable transmission (MIVT) system that utilizes clutches and brakes to selectively engage and disengage power paths between an engine and an infinitely variable power source, allowing for heavier utilization of mechanical power while minimizing IVP speeds, thereby reducing wear and optimizing power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an infinitely variable power source (IVP) is used to provide power in heavy-duty applications, then power transmission capability is improved, but IVP speeds become excessively high leading to component wear and part failure
Solution Approach 1:
The power transmission system is segmented into multiple independent power paths: a mechanical power path and an infinitely variable power path. The engageable transmission member selectively connects or disconnects these paths, allowing the system to divide power transmission tasks between different paths based on operating conditions, thereby preventing excessive speeds in the IVP.
Solution Approach 2:
The transmission system dynamically switches between different operating modes (serial mode and split-path mode) based on real-time conditions. The engageable transmission member can move between engaged and disengaged positions to change the power transmission configuration, optimizing performance and reliability for different operational requirements.
2Adaptability or versatility
If the engageable transmission member is moved between engaged and disengaged positions to shift modes, then adaptability between different power transmission modes is improved, but transmission shifts may cause jolts and power interruptions
Solution Approach 1:
The first and second components are pre-configured to rotate at approximately the same angular speed during the engagement process. This preliminary speed matching ensures that when the engageable transmission member moves from disengaged to engaged position, there is minimal speed differential between mating components, preventing jolts and power interruptions during mode transitions.
3Adaptability or versatility
If split-path mode operation is used to combine engine and IVP power, then power transmission flexibility is improved, but system complexity increases
Solution Approach 1:
The engageable transmission member serves multiple functions: it can be engaged to connect the mechanical power path for direct engine power transmission, or disengaged to allow IVP power transmission. This multi-functionality provides power transmission flexibility without requiring separate dedicated mechanisms for each mode, thereby limiting the increase in system complexity.
Data Source
AI summary
An infinitely variable transmission (IVT) provides a plurality of transmission modes. At least one mode is a serial mode and at least one other mode is a split-path mode. The IVT provides substantially seamless shifting between the plurality of transmission modes.