Hybrid Power Train Torque Continuity Shift Module
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Solution Overview
Problem
Conventional hybrid power trains with manual transmission mechanisms face challenges in ensuring good shift feeling due to torque interruption and inefficient fuel ratios, particularly when shifting gears with great step ratios and when the motor is driven by engine power.
Innovation Solution
A hybrid power train configuration with a shift module, shaft clutch, motor side gears, and a variable gear ratio mechanism that prevents torque interruption by allowing continuous motor torque during shifts and optimizing gear ratios for improved fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional AMT hybrid power train uses mainly reduction gears for motor driving at low speed, then the power train configuration is compact, but the shift feeling is deteriorated due to torque interruption during shifting
Solution Approach 1:
The motor is configured to continue rotating during gear shifts by maintaining electrical power supply to the motor, ensuring continuous torque output. This prevents the torque interruption that normally occurs in AMT systems during shifting, thereby maintaining smooth power delivery and good shift feeling while keeping the power train compact
Solution Approach 2:
The motor acts as an intermediary power source that compensates for the torque interruption caused by AMT shifting. By maintaining motor rotation and torque output during the shift process, the motor mediates between the discontinuous mechanical power transmission of the AMT and the requirement for continuous smooth power delivery to the wheels
2Reliability
If the motor is rotated by engine power during engine driving mode, then the motor can be ready for hybrid operation, but the motor rotation serves as drag torque causing deterioration of fuel ratio
Solution Approach 1:
The motor rotation state is dynamically controlled based on the driving mode. During engine-only driving mode, the motor is kept stationary (zero rotation) to eliminate drag torque and improve fuel efficiency. When hybrid operation is required, the motor is activated and rotated as needed. This dynamic adjustment of motor rotation state resolves the contradiction between maintaining motor readiness and minimizing energy loss
3Adaptability or versatility
If great step ratio gears are used in the transmission, then the power train can cover a wide speed range, but the shift feeling is deteriorated due to torque interruption feeling
Solution Approach 1:
The motor continues to provide torque during gear shifts involving great step ratios, ensuring continuous power delivery to the wheels. This continuous torque output from the motor compensates for the torque interruption that occurs during large ratio shifts, maintaining smooth acceleration and good shift feeling while enabling the use of great step ratio gears for wide speed range coverage
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 solution ensures excellent shift quality and improved fuel efficiency by maintaining continuous motor torque during shifts and optimizing gear ratios, reducing power consumption from the engine and enhancing overall driving performance.
Implementation Method 1
a shift module provided with a plurality of shift steps of a synchro-mesh type on a first input shaft and an output shaft
Implementation Method 2
a shaft clutch means provided for coupling or decoupling the second input shaft and the first input shaft
Implementation Method 3
a first clutch means provided for coupling or decoupling the motor side driving gear to or from the second input shaft
Data Source
AI summary
A hybrid power train for a vehicle may include a shift module with a plurality of shift steps of a synchro-mesh type provided on a first input shaft and an output shaft, a second input shaft driven by a motor and arranged coaxially with the first input shaft, a shaft clutch means for coupling/decoupling the second input shaft and the first input shaft, a motor side driving gear arranged rotatably on the second input shaft, a motor side driven gear arranged rotatably on the output shaft to be meshed with the motor side driving gear, a first clutch means for coupling/decoupling the motor side driving gear to/from the second input shaft, a second clutch means provided for coupling/decoupling the motor side driven gear to/from the output shaft, and a variable gear ratio providing means provided on the second input shaft to alternatively transfer a rotational force of the second input shaft to the output shaft.