Regenerative Braking System with Electro-Mechanical Actuation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional regenerative braking systems in electric vehicles face challenges in maximizing energy recovery and minimizing uncomfortable braking experiences due to fixed proportions of regenerative and frictional braking, leading to limited energy retrieval and responsiveness issues.
Innovation Solution
The implementation of an electro-mechanical brake (EMB) system that coordinates regenerative braking with hydraulic braking, using a central ECU to control both systems, allowing for variable frictional braking and enhanced responsiveness by installing EMB actuators on rear wheels, and hydraulic disc brakes on front wheels, with a motor-driven caliper to amplify braking force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the proportion of regenerative braking is increased to maximize energy recovery, then the energy recovery rate is improved, but the motor or battery may be damaged due to improper power control
Solution Approach 1:
The patent implements dynamic adjustment of regenerative braking power based on real-time monitoring of battery charge state and motor temperature. The control system continuously adapts the regenerative braking power level to match current system conditions, preventing damage while maximizing energy recovery when conditions permit.
Solution Approach 2:
The patent employs feedback control mechanisms where the control system monitors battery charge state, motor temperature, and other critical parameters, then adjusts regenerative braking power accordingly. This closed-loop control ensures that regenerative braking operates within safe limits while optimizing energy recovery.
2Loss of energy
If the proportion of regenerative braking is increased, then the energy recovery rate is improved, but the power of normal frictional braking must be reduced which may insufficiently satisfy driver demand for reducing vehicle speed
Solution Approach 1:
The patent dynamically adjusts the proportion of regenerative braking versus frictional braking based on driver demand and system conditions. The control system continuously optimizes the braking force distribution to satisfy driver requirements while maximizing energy recovery, rather than using a fixed proportion.
Solution Approach 2:
The patent changes the operating parameters of the braking system by adjusting the power distribution between regenerative and frictional braking based on multiple factors including driver demand, battery charge state, and vehicle speed. This allows flexible optimization of both energy recovery and braking performance.
3Device complexity
If a conventional hydraulic brake system is used with fixed proportion of regenerative and frictional braking, then the system structure is simple, but the amount of regenerative energy retrieved to the battery is limited
Solution Approach 1:
The patent replaces the fixed proportion braking system with a dynamic control system that continuously adjusts the ratio of regenerative to frictional braking. This allows the system to maximize energy recovery under varying operating conditions while maintaining reasonable structural complexity through electronic control.
Solution Approach 2:
The patent substitutes mechanical hydraulic braking control with electronic control systems that can dynamically adjust braking force distribution. This replacement of mechanical control with electronic control enables optimized energy recovery without proportionally increasing structural complexity.
4Device complexity
If regenerative braking transient occurs due to the difference in responsiveness between hydraulic braking force and regenerative driving force, then the braking system is simple to implement, but uncomfortable feeling is caused during braking operation
Solution Approach 1:
The patent implements dynamic coordination between hydraulic and regenerative braking systems to balance their different responsiveness characteristics. The control system continuously adjusts the contribution of each braking type to achieve smooth, comfortable braking transitions while maintaining simple overall system implementation.
Solution Approach 2:
The patent uses a control system as an intermediary that coordinates between the hydraulic braking system and regenerative braking system. This intermediary control mechanism smooths out the responsiveness differences between the two systems, eliminating uncomfortable transients while keeping the physical system structure relatively simple.
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 solution maximizes regenerative energy recovery, improves braking performance, and ensures safety by allowing precise control over braking forces, reducing the discomfort associated with regenerative braking transients and enhancing the overall braking experience.
Implementation Method 1
the regenerative braking system drives a motor by using the kinetic energy and charges a battery with electric energy generated from the motor
Implementation Method 2
an inverter converting DC voltage supplied from the fuel cell into 3-phase voltage to drive the driving motor
Implementation Method 3
an EMB (electro-mechanical braking) actuator installed to the rear wheel to generate braking force by operating a caliper using a motor
Implementation Method 4
a hydraulic disc brake installed to the front wheel and a hydraulic module supplying braking pressure to the hydraulic disc brake
Data Source
AI summary
Disclosed is a regenerative braking system capable of minimizing uncomfortable feeling during the braking operation while improving responsiveness and control performance by performing the braking operation using an electric motor. An electro-mechanical braking system is used when braking a rear wheel or front and rear wheels, so variable frictional braking is achieved, thereby maximizing the recovery rate of the regenerative energy.