Inline Electromechanical Transmission With Dual Planetary Modes
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Solution Overview
Problem
Traditional vehicle transmissions rely on mechanical gear systems, which are less efficient and less adaptable to varying operational modes compared to electromechanical systems, limiting their ability to provide optimal speed and torque conversions across different driving conditions.
Innovation Solution
A multi-mode inline electromechanical variable transmission system that incorporates two electromagnetic devices directly coupled to planetary gear sets, allowing for selective coupling and decoupling through a clutch and brake mechanism to optimize power transmission across multiple operating modes, including neutral, low range, high range, reverse, and power generation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional mechanical gear systems are used, then the transmission structure is simple and reliable, but the efficiency and adaptability to varying operational modes are reduced
Solution Approach 1:
The transmission system is divided into multiple planetary gear sets (first and second planetary gear sets) with distinct functional roles. Each gear set can operate independently or in combination, allowing the system to adapt to different operational modes (drive, reverse, neutral, power generation) by selectively engaging or disengaging specific components through clutch and brake mechanisms.
Solution Approach 2:
The system employs dynamic control mechanisms (clutches and brakes) that can selectively engage and disengage different gear sets and components based on operational requirements. This dynamic reconfiguration allows the transmission to adapt its mechanical configuration in real-time, optimizing performance for different driving conditions without requiring a completely different mechanical structure for each mode.
2Productivity
If multiple gear ratios are selectively coupled, then speed and torque conversions are optimized, but the mechanism complexity increases
Solution Approach 1:
The planetary gear sets are designed to serve multiple functions across different operational modes. The same first and second planetary gear sets provide speed reduction in drive mode, speed multiplication in reverse mode, and enable power splitting in power generation mode. This multi-functionality reduces the need for separate dedicated mechanisms for each function, optimizing productivity while controlling complexity.
Solution Approach 2:
Clutches and brakes serve as intermediary control elements that manage the engagement and disengagement of different gear sets and components. These intermediaries provide a standardized interface for controlling power flow paths, allowing complex gear ratio changes without requiring complex direct mechanical linkages between all possible gear combinations.
3Loss of energy
If electromagnetic devices are directly coupled to planetary gear sets, then power transmission efficiency is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The electromagnetic devices are directly coupled to the planetary gear sets, merging the power source and power transmission components into an integrated assembly. This direct coupling eliminates intermediate mechanical linkages and reduces energy losses between the electromagnetic devices and the gear sets, improving overall power transmission efficiency while maintaining a manageable level of manufacturing complexity through standardized coupling interfaces.
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
This system enables efficient and adaptive power transmission, enhancing vehicle performance by providing optimal speed and torque in various driving conditions, improving gradability and fuel efficiency, and allowing for regenerative energy capture.
Implementation Method 1
a first electromagnetic device directly coupled to a first planetary gear set and a second electromagnetic device directly coupled to a second planetary gear set
Implementation Method 2
a brake positioned to selectively limit movement of a ring gear of the second gear set when engaged
Data Source
AI summary
A drive system for a vehicle includes a first electromagnetic device directly coupled to a first planetary gear set and a second electromagnetic device directly coupled to a second planetary gear set. In a first mode of operation, a clutch is engaged to couple the second planetary gear set to the first planetary gear set and a brake is disengaged to allow rotation of the second planetary gear set and in a second mode of operation, the brake is engaged to limit rotation of the second planetary gear set and the clutch is disengaged.