Multi-mode Inline Electromechanical Transmission for Vehicle Mode Transition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional vehicle transmissions lack the flexibility and efficiency to seamlessly transition between various operating modes, such as startup, low range, mid range, high range, and reverse operations, often resulting in suboptimal performance and energy management.
Innovation Solution
A multi-mode inline electromechanical variable transmission system that incorporates a first and second electromagnetic device, along with a series of planetary gear sets, allowing for direct coupling and decoupling of rotational mechanical energy to optimize power distribution and mode switching, including the use of clutches and brakes for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional vehicle transmissions use gears and gear trains to provide speed and torque conversions, then the transmission can achieve basic gear ratio changes, but the system lacks flexibility to seamlessly transition between various operating modes (startup, low range, mid range, high range, reverse)
Solution Approach 1:
The transmission system is divided into multiple independent planetary gear sets (first, second, and third planetary gear sets) that can be selectively engaged or disengaged. Each planetary gear set can operate independently or in combination with others, allowing the system to achieve various operating modes (startup, low range, mid range, high range, reverse) by selectively coupling different gear sets, thereby improving adaptability while managing complexity through modular architecture.
2Adaptability or versatility
If the transmission system uses multiple planetary gear sets with selective coupling, then the system can achieve multiple operating modes and improved adaptability, but the device complexity increases due to additional components and control mechanisms
Solution Approach 1:
Multiple planetary gear sets are merged into a single integrated transmission system where the first, second, and third planetary gear sets share common components such as the ring gear, sun gear, and carriers. This merging allows the system to achieve multiple operating modes through selective coupling of different gear sets while reducing the total number of independent components compared to using separate transmission systems for each mode.
3Loss of energy
If traditional transmissions lack efficient mode transition mechanisms, then the system structure remains simple, but energy management becomes suboptimal with increased energy consumption during mode changes
Solution Approach 1:
The transmission system employs dynamic coupling mechanisms including clutches and brakes that can be selectively engaged or disengaged to control the interaction between different planetary gear sets. This dynamic control allows for smooth transitions between operating modes by progressively engaging or disengaging specific clutches and brakes, minimizing energy losses during mode changes while maintaining a manageable control system architecture.
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
Enables efficient energy management and smooth transitions between operating modes, enhancing vehicle performance, gradability, and reducing energy consumption by allowing the electromagnetic devices to operate as both motors and generators, depending on the mode, thereby improving overall vehicle efficiency and adaptability.
Implementation Method 1
a first electromagnetic device coupled to the first planetary gear set, a second electromagnetic device coupled to the second planetary gear set
Implementation Method 2
a first planetary gear set including a first carrier, a second planetary gear set including a second carrier, and a third planetary gear set including a sun gear, a ring gear, a plurality of planetary gears coupling the sun gear to the ring gear
Data Source
AI summary
A drive system for a vehicle includes a first planetary gear set including a first carrier, a second planetary gear set including a second carrier, and a third planetary gear set including a sun gear, a ring gear, a plurality of planetary gears coupling the sun gear to the ring gear, and a third carrier rotationally supporting the plurality of planetary gears. The third planetary gear set is directly coupled to the first carrier and the second carrier. The drive system further includes a first electromagnetic device coupled to the first planetary gear set, a second electromagnetic device coupled to the second planetary gear set, and an output shaft coupled to the first planetary gear set.