Parallel Hybrid Drive Shifting Element for Compact Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional hybrid drives for motor vehicles have high manufacturing costs due to complex automatic transmissions with many gears, which also occupy large installation space.
Innovation Solution
A parallel hybrid drive with a shifting element between the internal combustion engine and electric engine, allowing for different gear configurations and a compact planetary gearbox with two gears, enabling efficient coupling and decoupling of both engines and reducing the need for multiple transmission stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional automatic transmission with many gears is used in hybrid drives, then the gear coverage and operating range are improved, but the manufacturing cost and device complexity increase significantly
Solution Approach 1:
The transmission system is segmented into two independent parts: a first transmission for the internal combustion engine and a second transmission for the electric engine. This allows each transmission to be optimized separately, with the electric engine transmission having fewer gears (2-3 gears) while the internal combustion engine transmission handles the remaining gear ratios, thereby reducing overall complexity while maintaining comprehensive gear coverage
Solution Approach 2:
The hybrid drive system achieves multi-functionality by enabling different engine combinations (ICE only, electric only, or both together) and different transmission configurations depending on driving conditions. The control system can selectively engage different engine-transmission combinations to cover various operating ranges without requiring a single complex transmission to handle all scenarios
2Adaptability or versatility
If a conventional automatic transmission with many gears is used in hybrid drives, then the operating range is improved, but the manufacturing cost increases
Solution Approach 1:
By segmenting the transmission system into two separate transmissions with different gear counts, the manufacturing cost is reduced because simpler transmissions (fewer gears) can be used for the electric engine while maintaining comprehensive operating range through coordinated operation of both transmissions
Solution Approach 2:
The system changes operational parameters dynamically by switching between different engine-transmission combinations. The control system adjusts which engine powers the vehicle and which transmission is engaged based on driving conditions, allowing the system to achieve wide operating range without requiring all gears to be present in a single transmission
3Adaptability or versatility
If a conventional automatic transmission with many gears is used in hybrid drives, then the gear coverage is improved, but the installation space increases
Solution Approach 1:
Segmenting the transmission system allows the gears to be distributed across two separate transmission units rather than packed into one large transmission. The electric engine transmission with fewer gears occupies less space, and the internal combustion engine transmission is positioned separately, reducing the overall installation footprint while maintaining comprehensive gear coverage
Solution Approach 2:
The transmission system is arranged in a spatial distribution rather than a single linear sequence. By placing the two transmissions in different locations and allowing independent gear selection, the system achieves comprehensive gear coverage without requiring a long sequential arrangement of all gears in one transmission
4Device complexity
If the internal combustion engine and electric engine are connected via a common shaft, then the structure is simplified, but the flexibility in gear assignment and independent control is reduced
Solution Approach 1:
Instead of a common shaft connecting both engines, the system uses separate transmissions for each engine. This segmentation allows independent gear assignment and control for each engine-transmission pair, providing flexibility in selecting which engine powers the vehicle and which transmission ratio is engaged under different driving conditions
Data Source
AI summary
Hybrid drive for a motor vehicle including an internal combustion engine, an electric engine and an output shaft. The hybrid drive is designed as a parallel hybrid and provided with at least one operating state, in which both the internal combustion engine and the electric engine are coupled to the output shaft. Between the internal combustion engine and the electric engine is arranged a shifting element, which can be operated either connected in a first shifting position, in which the electric engine is connected to the output shaft and the internal combustion engine is decoupled, or in a second shifting position, in which both the electric engine and the internal combustion engine are connected to the output shaft.