Hybrid Power Module With Planetary Gear for Smooth Multi-Gear Shifting
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Solution Overview
Problem
Existing hybrid power vehicle systems with dual-clutch transmissions face challenges such as complex and costly control technology, large component size, difficulty in controlling sliding friction, limited gear positions, and high fuel consumption, especially in urban conditions.
Innovation Solution
A hybrid power system incorporating a planetary gear system with three rotating shafts, a first clutch, and a brake, along with a dual input shaft speed change mechanism, allowing for multiple gear positions and smooth shifting without clutch assistance, enabling differential engine and motor speed operation and reduced fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a dual-clutch transmission is used in the hybrid power system, then gear transmission efficiency is improved and dynamic performance is enhanced, but the device complexity increases and control technology becomes complex and costly
Solution Approach 1:
The patent extracts and removes the dual-clutch component from the hybrid power system, replacing it with a single-clutch configuration combined with a planetary gear system. This extraction eliminates the complex control technology associated with dual-clutch while maintaining gear transmission efficiency through the alternative mechanical arrangement.
Solution Approach 2:
The patent segments the power transmission path into distinct functional modules: the planetary gear system handles speed ratio changes, the single clutch manages engagement, and the motor assists during transitions. This segmentation simplifies control compared to the integrated dual-clutch system while preserving transmission efficiency.
2Adaptability or versatility
If a dual-clutch transmission is added to the hybrid power system, then parallel driving capability is improved, but the axial length increases and layout in engine compartment becomes difficult
Solution Approach 1:
The patent nests the planetary gear system within the existing transmission structure, where the sun gear, planet gears, and ring gear are concentrically arranged. This nested configuration achieves parallel driving capability through the planetary mechanism while minimizing axial length, allowing easier engine compartment layout.
3Force
If a dual-clutch transmission is used, then torque superposition is achieved, but the sliding friction control becomes difficult and jitter occurs during starting and gear shifting
Solution Approach 1:
The patent introduces the planetary gear system as an intermediary mechanism between the engine and transmission. This intermediary provides torque multiplication and smooth torque transfer through gear meshing, eliminating the need for sliding friction control that causes jitter in dual-clutch systems. The single clutch operates under more favorable conditions with reduced sliding friction requirements.
4Ease of manufacture
If the axial length is limited to reduce cost, then only 6 or 7 gear positions can be provided, but the speed ratio difference between low gear positions becomes large and fuel consumption in urban conditions worsens
Solution Approach 1:
The patent employs a dual-input shaft speed change mechanism where the first input shaft receives power from the engine and the second input shaft receives power from the motor. This dynamic configuration allows flexible gear ratio adjustment by selectively engaging different gear paths, enabling more than 7 gear positions within limited axial space. The increased number of gear positions with smaller ratio steps improves fuel consumption in urban conditions.
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
The system achieves high transmission efficiency, compact structure, and reduced fuel consumption by eliminating the need for double clutches, allowing for continuous speed adjustment and improved torque distribution between engine and motor, enhancing vehicle performance and reducing costs.
Implementation Method 1
the planetary gear system is provided with at least three rotating shafts, which respectively are: rotating shaft X1, rotating shaft X2, and rotating shaft X3, the axial lines of the three rotating shafts being on a straight line, and the rotational speed of rotating shaft X2 falling between the rotational speed of rotating shaft X1 and the rotational speed of rotating shaft X3
Implementation Method 2
The first clutch is arranged between any two of the three rotating shafts
Implementation Method 3
the brake is installed on the power output shaft of the engine
Data Source
AI summary
A hybrid power system comprises an engine, a hybrid power module, and a dual input shaft speed change mechanism. The hybrid power module comprises a motor, a planetary gear system, and a first clutch. The planetary gear system is provided with at least three rotating shafts, which respectively are: a rotating shaft X1, a rotating shaft X2, and a rotating shaft X3. The first clutch is arranged between any two of the three rotating shafts. A power output shaft of the engine is connected to the rotating shaft X3 or the rotating shaft X1 and to a second input shaft of the dual input shaft speed change mechanism. A rotor of the motor is connected to the rotating shaft X1 or to the rotating shaft X3. The rotating shaft X2 is connected to a first input shaft of the dual input shaft speed change mechanism.