Vehicle Control System for Regenerative Braking Loss Reduction
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Solution Overview
Problem
In four-wheel drive vehicles, delays in power transmission to the front wheels due to disconnector delays or communication signal delays result in loss of regenerative braking, leading to decreased fuel economy due to hydraulic braking intervention.
Innovation Solution
A method and system that predicts sudden braking and overtaking based on driver propensity and front vehicle state, controlling four-wheel drive and regenerative braking to minimize hydraulic braking intervention, including determining driving propensity indices and converting to four-wheel drive mode when necessary to optimize brake distribution and regenerative braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power transmission to front wheels is delayed due to disconnector delays or communication signal delays, then four-wheel drive control is achieved, but regenerative braking is lost and fuel economy decreases
Solution Approach 1:
The controller predicts sudden braking situations in advance by monitoring driver propensity and front vehicle state, and proactively converts to four-wheel drive mode before the braking occurs. This preliminary action eliminates the delay between braking detection and four-wheel drive engagement, allowing regenerative braking to function continuously without interruption.
2Force
If hydraulic braking intervenes during delay time to maintain total braking amount, then braking performance is maintained, but regenerative braking is lost
Solution Approach 1:
By predicting sudden braking situations in advance and converting to four-wheel drive mode proactively, the system ensures that regenerative braking is already active when braking occurs. This eliminates the need for hydraulic braking intervention, maintaining braking performance while preserving regenerative braking energy recovery.
3Loss of energy
If four-wheel drive mode is converted proactively based on prediction, then regenerative braking loss is reduced, but device complexity increases
Solution Approach 1:
The controller uses prediction algorithms that analyze driver propensity and front vehicle state to proactively convert to four-wheel drive mode. This approach reduces regenerative braking loss by ensuring timely mode conversion, while the prediction-based strategy keeps the control logic relatively simple compared to more complex sensor arrays or multiple actuators.
Data Source
AI summary
A method of controlling the vehicle may include predicting, by a controller, a braking situation of the vehicle; performing, by the controller, brake distribution control of front and rear wheels of the vehicle in a response to a predicted sudden braking of the vehicle at a predetermined level; and performing, by the controller, independent braking control of the rear wheels of the vehicle in a response to a predicted general braking of the vehicle at the predetermined level.