Vehicle Braking Control System for Consistent Deceleration
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Solution Overview
Problem
Regenerative braking in hybrid and electric vehicles provides uneven driving experiences due to varying energy recovery capabilities based on battery state of charge, potentially leading to dangerous driving conditions as the same pedal depression may result in different vehicle decelerations at different SOC levels.
Innovation Solution
A braking control system that determines a target deceleration and uses a combination of regenerative braking and friction braking to achieve this deceleration, supplementing regenerative braking with friction braking when the actual deceleration falls short, thereby maintaining consistent vehicle deceleration regardless of battery state of charge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative braking is used to recover energy, then fuel consumption and emission are reduced, but driving experience becomes uneven and dangerous conditions may occur
Solution Approach 1:
The system continuously monitors the actual deceleration and compares it with the target deceleration. When the actual deceleration deviates from the target (indicating insufficient regenerative braking), the control device automatically adjusts the braking force distribution between regenerative and friction brakes to achieve the desired deceleration, ensuring consistent driving experience and safety
Solution Approach 2:
The braking system combines two different braking mechanisms - regenerative braking (electromagnetic force) and friction braking (mechanical friction) - into a composite braking system. This allows the system to leverage the energy recovery capability of regenerative braking while using friction braking to supplement when necessary, achieving both energy efficiency and reliable deceleration control
2Quantity of substance
If regenerative braking torque varies with battery SOC, then energy storage optimization is achieved, but deceleration consistency deteriorates
Solution Approach 1:
The control device acts as an intermediary that manages the interaction between the battery's charge state and the braking system. It adjusts the braking force distribution based on battery SOC, using friction braking as a mediator to compensate when regenerative braking is limited by battery charge levels, thereby maintaining consistent deceleration despite variations in energy storage capacity
Solution Approach 2:
The system dynamically adjusts the braking force distribution between regenerative and friction brakes based on real-time battery SOC conditions. When battery charge is high, more regenerative braking is used; when battery charge is low, friction braking is increased to maintain deceleration consistency. This dynamic adaptation ensures both optimal energy storage management and consistent driving experience
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
Ensures a consistent driving experience by adjusting braking torque to match the driver's intended deceleration, reducing the risk of accidents by maintaining consistent vehicle deceleration across varying battery SOC levels.
Implementation Method 1
the electric motors in an EV or HEV can be controlled to operate as generators to convert the kinetic and potential energy of the vehicle into electric energy
Implementation Method 2
applying friction braking in addition to the regenerative braking
Data Source
AI summary
A braking control method and system are disclosed. According to certain embodiments, the method may include determining a target deceleration. The method may also include decelerating the vehicle by regenerative braking. The method may further include, when determining that an actual deceleration by the regenerative braking is below the target deceleration, applying friction braking in addition to the regenerative braking to achieve the target deceleration.