4WD Regenerative Braking Disconnector Control for Stable Torque Split
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Solution Overview
Problem
Regenerative braking in four-wheel drive vehicles is often used indiscriminately, leading to degraded fuel efficiency and unstable braking due to improper distribution of braking force between the front and rear wheels, which is not effectively controlled by existing systems.
Innovation Solution
An apparatus and method that utilize a computing device to calculate the necessary braking amount, a controller to engage or release the disconnector based on specific conditions, and a distributing device to allocate regenerative braking to motors, ensuring proper distribution and engagement/release of the disconnector based on braking conditions, pedal speed, and energy recovery amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative braking is indiscriminately used in braking of the vehicle, then energy recovery amount is increased, but fuel efficiency is degraded and braking stability is reduced
Solution Approach 1:
The system dynamically changes the regenerative braking distribution parameters based on vehicle speed, braking force requirements, and motor operating conditions. By adjusting the proportion of regenerative braking applied to front and rear wheels according to real-time parameters, the system maximizes energy recovery while maintaining braking stability and avoiding degradation of fuel efficiency.
Solution Approach 2:
The disconnector mechanism enables dynamic switching between different motor configurations (front-wheel drive, rear-wheel drive, or four-wheel drive) during regenerative braking. This dynamic adaptation allows the system to optimize energy recovery based on current driving conditions while preventing braking instability that would occur with indiscriminate regenerative braking application.
2Loss of energy
If regenerative braking is applied without proper distribution control, then energy recovery is maximized, but braking force distribution becomes unstable
Solution Approach 1:
The control system continuously monitors braking force requirements, motor operating states, and vehicle dynamics, then adjusts the regenerative braking distribution in real-time. This feedback mechanism ensures that energy recovery is maximized only when it does not compromise braking force distribution stability, resolving the contradiction between energy recovery and braking stability.
Solution Approach 2:
The system applies different regenerative braking forces to front and rear wheels based on their specific conditions and requirements. By optimizing the local braking characteristics of each wheel rather than applying uniform regenerative braking, the system achieves both high energy recovery and stable braking force distribution.
3Loss of energy
If the disconnector is not properly controlled, then regenerative braking can be applied to all wheels, but fuel efficiency degrades due to improper braking distribution
Solution Approach 1:
The disconnector enables dynamic reconfiguration of the drive system during regenerative braking, switching between front-wheel, rear-wheel, and four-wheel drive modes based on real-time conditions. This dynamic control optimizes the balance between energy recovery and fuel efficiency by preventing improper braking distribution that would degrade overall vehicle productivity.
Solution Approach 2:
The system adjusts operational parameters including disconnector state, motor torque distribution, and braking force allocation based on vehicle speed, load conditions, and battery state of charge. These parameter changes optimize both energy recovery amount and fuel efficiency simultaneously by adapting to varying operating conditions.
Data Source
AI summary
An apparatus for performing regenerative braking by controlling a disconnector of a vehicle includes a computing device to calculate a braking amount necessary for braking, a controller to engage or release the disconnector of the vehicle, based on the calculated braking amount, and a distributing device to distribute a regenerative braking amount necessary for braking into at least one motor included in the vehicle, when the disconnector is engaged or released.