Electric Vehicle Braking Control Dynamics
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Solution Overview
Problem
In electric vehicles, unconditionally prioritizing regenerative braking over friction braking in vehicles with rear-mounted motors leads to unstable vehicle behavior due to uneven braking force distribution between front and rear wheels, while always favoring front wheels results in wasted energy and adverse fuel economy effects.
Innovation Solution
A system and method that dynamically control regenerative braking torque based on driving information and vehicle state, switching between regeneration priority and stability priority modes to maximize regenerative braking within stable limits, distributing friction and regenerative braking forces according to an ideal braking distribution line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative braking is unconditionally prioritized over friction braking in vehicles with rear-mounted motors, then energy recovery efficiency is improved, but vehicle braking stability deteriorates due to uneven braking force distribution between front and rear wheels
Solution Approach 1:
The patent applies dynamics by switching between two braking modes (regeneration priority mode and stability priority mode) based on real-time vehicle conditions. The system dynamically adjusts the braking force distribution between regenerative and friction braking, transitioning from a static unconditional priority approach to a dynamic conditional approach that optimizes both energy recovery and stability.
Solution Approach 2:
The patent changes the parameter of braking force distribution by introducing mode switching logic. In regeneration priority mode, the system maximizes regenerative braking torque, while in stability priority mode, it adjusts the distribution to maintain ideal braking characteristics. This parameter change allows the system to adapt between energy efficiency and stability requirements.
2Stability of the object's composition
If friction braking is always favored over regenerative braking, then vehicle braking stability is maintained, but fuel economy deteriorates due to wasted kinetic energy
Solution Approach 1:
The system dynamically determines the optimal braking mode based on real-time conditions including vehicle speed, acceleration, and road surface characteristics. Instead of statically favoring friction braking, the system transitions between modes to maximize regenerative braking opportunities while maintaining stability, thereby improving fuel economy without sacrificing safety.
Solution Approach 2:
The patent changes the braking force distribution parameter by enabling regenerative braking dominance in appropriate conditions. By switching from stability priority to regeneration priority mode when conditions permit, the system recovers kinetic energy that would otherwise be wasted, improving fuel economy while maintaining adequate braking stability.
3Loss of energy
If regenerative braking torque is maximized without conditions, then energy recovery is optimized, but vehicle running stability deteriorates under certain driving conditions
Solution Approach 1:
The patent implements dynamic mode switching based on vehicle operating conditions such as speed, acceleration, and road surface state. The system transitions between regeneration priority and stability priority modes to ensure that regenerative braking torque is maximized only when it does not compromise running stability, thereby resolving the contradiction between energy recovery and stability.
Solution Approach 2:
The system changes the regenerative braking torque parameter by introducing conditional control logic. When in regeneration priority mode, the torque is maximized for energy recovery; when in stability priority mode, the torque is adjusted to maintain stable vehicle operation. This parameter adaptation allows the system to optimize energy recovery without sacrificing running stability.
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
This approach simultaneously enhances fuel economy, braking stability, and running stability by optimizing regenerative braking distribution, ensuring the vehicle operates within safe braking limits and maintains efficient energy recovery.
Implementation Method 1
a regenerative mode for recovering kinetic energy of the vehicle through power generation by the motor at the time of braking or coasting by inertia and hence charging a battery
Implementation Method 2
friction braking torque generated in brakes (i.e., friction braking force)
Data Source
AI summary
The present disclosure provides a method of controlling braking of an electric vehicle in which friction braking force generated by a friction braking unit is applied to front wheels and regenerative braking force generated by a motor is applied to rear wheels includes: determining driver's request braking force by a controller based on a driver's braking-input value; detecting driving information and state information of the vehicle by a detection unit; and determining a braking mode of the vehicle that satisfies the driver's request braking force by the controller based on the detected information and information of running state of the vehicle obtained from the detected information. In addition, the present disclosure provides a system of controlling braking of an electric vehicle.