Vehicle Brake Control for Electric-to-Mechanical Torque Handover
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Solution Overview
Problem
Existing vehicle braking systems face challenges in providing precise control to prevent slipping backward and stalling of the drive motor, particularly in accurately determining when to transition from electric to mechanical braking.
Innovation Solution
A method and device that calculate and control the electric braking torque based on vehicle state information, including mass and deceleration, to determine the optimal time to unload electric braking torque and apply mechanical braking torque, using formulas to calculate exit speeds and unloading rates, ensuring precise control and preventing motor stalling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electric braking torque is applied continuously to ensure sufficient braking force, then braking effectiveness is improved, but the risk of vehicle slipping backward or motor stalling increases
Solution Approach 1:
The system calculates the electric braking exit speed in advance based on vehicle mass, deceleration requirements, and current speed, then proactively unloads the electric braking torque when approaching this calculated speed threshold, preventing the harmful effects before they occur
Solution Approach 2:
The system continuously monitors vehicle state information including current speed, vehicle mass, and deceleration requirements, uses this feedback to dynamically calculate the appropriate electric braking exit speed, and adjusts the braking torque accordingly to maintain optimal braking performance while avoiding adverse effects
2Object-affected harmful factors
If electric braking torque is unloaded early to prevent slipping backward, then safety is improved, but braking precision and control accuracy deteriorate
Solution Approach 1:
The system performs preliminary calculation of the electric braking exit speed using vehicle mass, deceleration requirements, and current speed before unloading the braking torque, ensuring that the unloading occurs at the optimal moment that maintains both safety and braking precision
Solution Approach 2:
The system dynamically adjusts the electric braking exit speed calculation based on real-time vehicle state information including changing mass and deceleration requirements, making the braking control adaptive and precise under varying operating conditions
Data Source
AI summary
A vehicle and a braking method and a device therefor are provided. The method includes the following steps: obtaining a first state information of the vehicle, where the first state information includes a vehicle mass and a deceleration required by braking; calculating a braking torque required by the vehicle according to the first state information, and controlling the vehicle to output an electric braking torque according to the braking torque required by the vehicle; obtaining a current vehicle speed of the vehicle and an electric braking exit protection speed; and calculating an electric braking exit speed according to the braking torque required by the vehicle and the deceleration required by braking, and controlling the vehicle to unload the electric braking torque when the current vehicle speed is less than a larger one of the electric braking exit speed and the electric braking exit protection speed.