Hybrid Powertrain Clutch Dynamics for Versatile Operation
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Solution Overview
Problem
Existing hybrid powertrain units for motor vehicles face challenges in achieving a simple, efficient, reliable, and versatile design with small overall dimensions, particularly in efficiently managing the connection between the electrical machine and the differential for optimal operation.
Innovation Solution
Incorporating an engagement device, such as a clutch device with an electromagnetic or electrohydraulic actuator, and an electronic control unit to manage the connection between the electrical machine and the differential, along with a belt transmission for direct connection to the internal-combustion engine, allowing for efficient operation and versatility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the electrical machine is permanently connected to the differential, then the system structure is simplified, but the operational efficiency and versatility are reduced
Solution Approach 1:
The patent applies the dynamics principle by implementing a clutch device that enables the electrical machine to be dynamically connected to or disconnected from the differential based on operating conditions. This allows the system to adapt between different operational modes (electric drive, hybrid drive, energy recovery) rather than maintaining a fixed permanent connection, thereby resolving the contradiction between structural simplicity and operational versatility.
2Adaptability or versatility
If an engagement device is added to connect the electrical machine to the differential, then the operational versatility is improved, but the device complexity increases
Solution Approach 1:
The clutch device serves multiple functions: it enables permanent connection for simplified operation, allows temporary disconnection for optimal efficiency, and provides engagement/disengagement control for versatility. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in overall device complexity while maintaining operational versatility.
3Adaptability or versatility
If the electrical machine shaft is connected to the engine shaft via belt transmission, then the system adaptability is improved, but the device complexity and dimensions increase
Solution Approach 1:
The belt transmission acts as an intermediary mechanism between the electrical machine shaft and the engine shaft, enabling flexible power transfer and operational modes. This intermediary connection allows the system to adapt to different operating conditions while using a relatively simple and compact belt-driven mechanism rather than complex direct mechanical linkages, thereby limiting the increase in device complexity and dimensions.
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 enables efficient power management, allowing the hybrid powertrain unit to operate effectively in various conditions, including electric drive, hybrid drive, and energy recovery, while maintaining a compact design suitable for front-wheel-drive vehicles.
Implementation Method 1
an electromagnetic or electrohydraulic actuator
Implementation Method 2
an electromagnetic or electrohydraulic actuator
Implementation Method 3
a belt transmission, including an endless belt engaged on a first pulley and a second pulley
Data Source
AI summary
A hybrid powertrain unit includes an internal-combustion engine, and a gearbox device with a primary shaft that can be connected to the shaft of the internal-combustion engine via a clutch device. The gearbox device includes a secondary shaft with an output pinion meshing with a first crown wheel of a differential, the casing of which is rigidly connected to the casing of the gearbox device. An electrical machine is designed to function as electric motor and as electric generator, having a shaft connected by a transmission to a second crown wheel of the differential. An engagement device driven via an electronic control actuator is set between the shaft of the electrical machine and the second crown wheel. The electrical machine can be set coaxially to the output shafts of the differential or parallel thereto. Alternatively, the shaft of the electrical machine may be connected to the shaft of the internal-combustion engine by means of a belt transmission and engagement device.