Eco-Friendly Vehicle Braking Control Method
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Solution Overview
Problem
Conventional eco-friendly vehicles experience inaccuracy in braking distribution and deterioration of braking performance due to communication delays between controllers, leading to a considerable time lag in distributing braking power effectively.
Innovation Solution
The proposed braking control method calculates a motor torque command based on a regenerative braking permissible amount, allowing for reduced communication delay by using this command to determine the regenerative braking execution amount, thereby improving braking performance by directly controlling the motor torque through the vehicle controller, rather than relying on actual motor torque from the motor controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the conventional method of calculating regenerative braking execution amount using actual motor torque from motor controller is used, then the system maintains simplicity in control architecture, but communication delay between controllers causes inaccuracy in braking distribution and deterioration of braking performance
Solution Approach 1:
The vehicle controller calculates the regenerative braking execution amount in advance using the motor torque command before the motor controller executes the torque application. This preliminary calculation allows the brake controller to receive accurate regenerative braking execution amount information without waiting for actual motor torque feedback, thereby reducing communication delay and improving braking distribution accuracy
Solution Approach 2:
The system implements a feedback mechanism where the vehicle controller receives motor torque command information from the brake controller, calculates the regenerative braking execution amount, and feeds back this calculated value to the brake controller. This closed-loop feedback ensures accurate braking distribution while minimizing communication delays by using command values rather than waiting for actual torque measurements
2Productivity
If the regenerative braking execution amount is calculated from actual motor torque transmitted from motor controller, then the control system maintains straightforward architecture, but the feedback time to brake controller is considerably delayed
Solution Approach 1:
The vehicle controller performs preliminary calculation of the regenerative braking execution amount using the motor torque command value before the braking action is fully executed. This allows the brake controller to immediately receive accurate regenerative braking execution amount information without waiting for actual motor torque feedback, significantly reducing feedback time and improving braking control speed
Solution Approach 2:
The system skips the traditional sequence of waiting for actual motor torque measurement and transmission by directly calculating the regenerative braking execution amount from the motor torque command. This rushes through the communication delay period by using predictive calculation based on command values, thereby accelerating the feedback process to the brake controller
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 reduces the time required for feedback of the regenerative braking execution amount to the brake controller, enhancing the accuracy of braking distribution and overall braking performance by minimizing communication delay.
Implementation Method 1
a regenerative braking system converting kinetic energy of into electrical energy during braking of the vehicle and storing the converted energy in the battery
Data Source
AI summary
A braking control method of an eco-friendly vehicle includes calculating, if a braking manipulation performed by a driver is sensed, a motor torque command according to a regenerative braking permissible amount. If it is determined that a motor has been normally driven, a regenerative braking execution amount is calculated from the motor torque command. Motor control for regenerative braking is performed according to the motor torque command. A friction braking amount satisfying the total braking amount is calculated from the regenerative braking execution amount according to the braking manipulation performed by the driver, thereby controlling friction braking to generate braking power corresponding to the friction braking amount.