Multi-mode Power Train Clutch Segmentation for Energy Loss Reduction
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Solution Overview
Problem
Existing power train systems face inefficiencies in transitioning between different transmission modes, such as mechanical-path, split-path, and CVP-only modes, due to energy losses associated with the use of continuously variable power sources, limiting flexibility and efficiency in power delivery for various applications.
Innovation Solution
A power train system with a variator assembly and control assembly that includes multiple clutch devices, allowing for direct power transmission between the engine and output component, or between the variator and output component, enabling seamless transition between mechanical-path, split-path, and CVP-only modes by engaging and disengaging clutch devices to optimize power flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If continuously variable power sources are used to provide useful power, then adaptability and versatility are improved, but energy losses increase
Solution Approach 1:
The power transmission system is segmented into multiple independent paths: a mechanical path with direct mechanical connection, a CVP path with continuously variable power sources, and a hybrid path combining both. Clutch devices segment the power flow to selectively engage or disengage specific paths, allowing the system to choose the most efficient transmission mode for given operating conditions.
Solution Approach 2:
The system dynamically transitions between different transmission modes (mechanical-path mode, CVP-only mode, split-mode) based on operating conditions. Control assembly dynamically engages or disengages clutch devices to switch power transmission paths, optimizing the balance between adaptability and energy efficiency in real-time.
2Adaptability or versatility
If multiple clutch devices are added to enable mode transitions, then adaptability is improved, but device complexity increases
Solution Approach 1:
The clutch devices serve multiple functions: they engage/disengage power paths, enable mode transitions, and control power flow distribution. The control assembly integrates multiple control functions into a unified system that manages mechanical path, CVP path, and hybrid path transitions through coordinated clutch operation.
3Loss of energy
If direct power transmission path is used, then energy efficiency is improved, but adaptability deteriorates
Solution Approach 1:
Clutch devices act as intermediaries between the engine, variator assembly, and output component. They mediate power flow by selectively connecting or disconnecting the mechanical path and CVP path, allowing the system to transition between direct mechanical transmission (for efficiency) and CVP-mediated transmission (for adaptability) based on operating requirements.
Data Source
AI summary
A power train and related vehicle are described for multi-mode power transmission. A first continuously variable power source (“CVP”) may convert rotational power received by the engine for transmission to a second CVP. A variator assembly may receive rotational power from the second CVP at a first input and directly from the engine at a second input. A control assembly may include one or more output components and a plurality of clutch devices arranged between the one or more output components and the variator assembly and engine. In a first state of the control assembly, the plurality of clutch devices may collectively provide direct power transmission between the engine and the one or more output components. In a second state of the control assembly, the plurality of clutches may collectively provide power transmission between the variator and the one or more output components.