Hybrid Powertrain Gear Layout for Higher Torque Without Larger Motors
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Solution Overview
Problem
Hybrid vehicles face challenges in enhancing power performance while maintaining fuel efficiency without increasing the size and cost of the motor generator, which is typically addressed by increasing its size, leading to weight and cost increments.
Innovation Solution
The vehicle driving device incorporates a power transmission mechanism with a first and second gear train, where the first gear train has a large-diameter and small-diameter rotator coupling the engine and motor generator, and the second gear train has a small-diameter and large-diameter rotator coupling the motor generator and transmission mechanism, allowing for increased motor torque without enlarging the motor generator, thereby enhancing power performance and fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the size of the motor generator is increased to enhance power performance, then the power output is improved, but the weight and cost of the vehicle increase
Solution Approach 1:
The power transmission path is segmented into multiple paths with different gear trains. The first gear train (large-diameter to small-diameter rotators) transmits engine power to the motor generator, while the second gear train (small-diameter to large-diameter rotators) transmits motor generator power to the transmission mechanism. This segmentation allows optimized torque multiplication without increasing motor generator size.
Solution Approach 2:
The first and second gear trains act as intermediary mechanisms between the engine and transmission mechanism. These gear trains multiply torque through their gear ratios, allowing the motor generator to operate at optimal size while still achieving high power output through mechanical advantage.
2Power
If the size of the motor generator is increased to enhance power performance, then the power output is improved, but the cost of the vehicle increases
Solution Approach 1:
The power transmission path is segmented into multiple paths with different gear trains. The first gear train (large-diameter to small-diameter rotators) transmits engine power to the motor generator, while the second gear train (small-diameter to large-diameter rotators) transmits motor generator power to the transmission mechanism. This segmentation allows optimized torque multiplication without increasing motor generator size.
Solution Approach 2:
The first and second gear trains act as intermediary mechanisms between the engine and transmission mechanism. These gear trains multiply torque through their gear ratios, allowing the motor generator to operate at optimal size while still achieving high power output through mechanical advantage.
3Speed
If the motor generator size is increased to improve acceleration, then the power performance is enhanced, but the fuel efficiency deteriorates
Solution Approach 1:
The system dynamically switches between different power transmission paths and operating modes. The control unit selects whether to use the first gear train, second gear train, or both in combination, depending on the required power output and vehicle operating conditions. This dynamic adaptation allows optimal fuel efficiency while maintaining acceleration performance.
Solution Approach 2:
The system changes operating parameters including gear selection, engine output, and motor generator output to optimize performance. By adjusting these parameters dynamically, the system achieves high acceleration when needed while maintaining fuel efficiency during normal operation.
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 configuration enhances acceleration and energy efficiency of the hybrid vehicle by increasing motor RPM, improving power performance without increasing the motor generator's size, thus maintaining fuel efficiency and reducing costs.
Implementation Method 1
The first power transmission mechanism includes a first large-diameter rotator that is coupled to the engine and a first small-diameter rotator that is coupled to the motor generator. The first large-diameter rotator is larger in diameter than the first small-diameter rotator. The second power transmission mechanism includes a second small-diameter rotator that is coupled to the motor generator and a second large-diameter rotator that is coupled to the transmission mechanism. The second large-diameter rotator is larger in diameter than the second small-diameter rotator.
Data Source
AI summary
A vehicle driving device mounted on a hybrid vehicle includes an engine coupled to wheels of the vehicle via a power transmission path, a transmission mechanism disposed on the power transmission path, a motor generator, a first power transmission mechanism, and a second power transmission mechanism. The motor generator is disposed on a path coupling the engine and transmission mechanism, the first power transmission mechanism is disposed on a path coupling the engine and motor generator, the second power transmission mechanism is disposed on a path coupling the motor generator and transmission mechanism. These paths are included in the power transmission path. The first power transmission mechanism includes a large-diameter rotator and a small-diameter rotator coupled to the engine and the motor generator respectively. The second power transmission mechanism includes a small-diameter rotator and a large-diameter rotator coupled to the motor generator and the transmission mechanism respectively.