Multimode Clutch Module for AWD Torque Control
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Solution Overview
Problem
Current all-wheel drive (AWD) vehicles lack the flexibility to achieve multiple clutching modes between the powertrain and drive wheels, limiting their ability to efficiently disconnect one set of drive wheels when AWD functionality is not required, which affects fuel economy and reduces transfer case and differential losses.
Innovation Solution
A multimode clutch module (MMCM) is introduced, allowing for selective connection and disconnection of drive wheels by utilizing a mechanism with a notch ring, inner race, pawls, cams, and a mode shift execution assembly to provide two-way locked, two-way unlocked, one-way locked, and one-way unlocked modes, enabling more efficient power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional dog clutch or friction clutch is used in AWD vehicles, then the vehicle can provide all-wheel drive functionality, but the vehicle cannot achieve multiple clutching modes (two-way locked, two-way unlocked, one-way locked, one-way unlocked) which limits fuel economy optimization
Solution Approach 1:
The clutch module is divided into multiple independent components: a first clutch assembly for torque transmission, a second clutch assembly for mode control, and a control mechanism. This segmentation allows each component to perform specific functions, enabling multiple clutching modes while maintaining manageable complexity through modular design
Solution Approach 2:
The clutch module is designed as a universal multi-functional device that can operate in four distinct modes (two-way locked, two-way unlocked, one-way locked, one-way unlocked) depending on driving conditions. This multi-functionality allows a single clutch module to replace what would traditionally require multiple separate clutch mechanisms, optimizing fuel economy across various driving scenarios
2Reliability
If the AWD system remains engaged continuously, then traction and stability are maintained, but fuel economy deteriorates due to continuous transfer case and differential losses
Solution Approach 1:
The clutch module dynamically adjusts its engagement state based on real-time driving conditions, transitioning between locked and unlocked modes as needed. This dynamic control allows the system to maintain traction when required while disengaging to reduce energy losses during normal cruising, optimizing the balance between reliability and fuel economy
Solution Approach 2:
The system changes the operational parameters of the clutch module (engagement/disengagement state, locked/unlocked mode) based on driving conditions. By adjusting these parameters, the system can maintain full AWD functionality when traction is needed while reducing energy consumption during normal driving conditions
3Device complexity
If a single clutch mechanism is used, then device complexity is reduced, but the ability to provide multiple clutching modes (two-way locked, one-way locked, two-way unlocked) is lost
Solution Approach 1:
The invention merges the functionality of multiple clutch mechanisms into a single integrated clutch module. The first clutch assembly handles torque transmission while the second clutch assembly manages mode transitions, combining what would traditionally require separate clutch devices into one unified system that provides all four clutching modes
Data Source
AI summary
In an all-wheel drive (AWD) vehicle, torque carrying connections are provided between the powertrain and all four wheels. A multimode clutch module or clutches are provided to selectively disconnect two of the wheels from the powertrain during operating conditions where disconnection improves the performance and efficiency of the AWD vehicle. The multimode clutch module may be installed at various locations of the AWD vehicle, such as within a front or rear differential, between a half axle and a differential or between a half axle and a corresponding wheel, or within a transfer case or power transfer unit.