Hybrid Powertrain Using Complex Planetary Gear Set
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Solution Overview
Problem
Hybrid vehicle powertrains face challenges in achieving efficient fuel consumption and power performance while maintaining a simple configuration and minimizing parts to reduce costs and facilitate mounting.
Innovation Solution
A powertrain configuration utilizing a complex planetary gear set with four rotary elements, including an input shaft connected to an engine, a motor generator, brakes, and an output shaft, along with clutches and a two-way device for independent motor generator connection, allowing for multiple shift ranges and efficient power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the powertrain configuration is simplified to minimize parts, then manufacturing cost and mounting ease are improved, but the number of achievable shift ranges may be reduced
Solution Approach 1:
The patent combines two planetary gear sets into a single complex planetary gear set where the first carrier and second ring gear are integrated. This merging reduces the total number of parts while maintaining multiple shift ranges through the coordinated operation of the integrated components with the motor generator and brakes.
Solution Approach 2:
The motor generator serves multiple functions by being independently connectable to different rotary elements (first carrier, second ring gear, or third sun gear) through the two-way device. This multi-functionality allows the same component to enable various operation modes (engine mode, e-CVT mode, EV mode) without adding separate components for each function.
2Device complexity
If the powertrain configuration is simplified to reduce parts, then manufacturing cost is improved, but power performance may be compromised
Solution Approach 1:
The integration of the first carrier and second ring gear into a single rotary element reduces part count while the complex planetary gear set maintains adequate power transmission capability through its multi-element structure and multiple connection points for the motor generator and input shaft.
Solution Approach 2:
The two-way device enables dynamic reconfiguration of the motor generator connections to different rotary elements based on operating conditions. This dynamic adaptability allows the system to optimize power distribution for different modes (engine mode, e-CVT mode, EV mode) without requiring separate fixed configurations for each power level.
3Productivity
If more shift ranges are implemented to improve fuel efficiency, then engine efficiency is improved, but device complexity increases
Solution Approach 1:
The motor generator with two-way connection capability serves as a universal component that enables multiple operation modes (engine mode with various gear ratios, e-CVT mode for continuous variable transmission, and EV mode). This multi-functionality achieves diverse shift ranges for improved fuel efficiency without proportionally increasing device complexity, as the same motor generator and complex planetary gear set handle all modes.
Data Source
AI summary
A powertrain for a hybrid vehicle includes: a complex planetary gear set including a first rotary element, a second rotary element, a third rotary element, and a fourth rotary element; an input shaft connected with an engine and installed to be able to be selectively connected to each of the first rotary element and the second rotary element of the complex planetary gear set; a motor generator connected to the first rotary element of the complex planetary gear set; a first brake installed to be able to fixedly connect the second rotary element of the complex planetary gear set to a transmission case; a second brake installed to be able to fixedly connect the third rotary element of the complex planetary gear set to the transmission case; and an output shaft connected to the fourth rotary element of the complex planetary gear set.