EV Brake Torque Control for Regeneration and Grade Compensation
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Solution Overview
Problem
Existing electric vehicles face challenges in achieving consistent braking effects across various driving scenarios due to inconsistent energy regeneration, which can affect safety and user experience.
Innovation Solution
A control method that determines motor output torque based on accelerator pedal opening and gradient information, combined with hydraulic brake torque, to ensure consistent braking by distinguishing energy regeneration torque and gradient compensation torque, and adjusting torque allocation to multiple brake mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If energy regeneration function is used for braking, then energy utilization is improved, but braking effect consistency deteriorates
Solution Approach 1:
The motor output torque is segmented into two distinct components: energy regeneration torque (based on accelerator pedal opening and vehicle speed) and gradient compensation torque (based on gradient information). This segmentation allows independent optimization of each torque component, ensuring that energy regeneration effectiveness is maintained while gradient-specific adjustments improve braking consistency across different road conditions
Solution Approach 2:
The control system dynamically adjusts the motor output torque by combining energy regeneration torque with gradient compensation torque. The gradient compensation torque varies dynamically based on real-time gradient information, enabling the system to adapt to changing road conditions and maintain consistent braking effects while preserving energy regeneration benefits
2Reliability
If motor output torque is calibrated to improve braking effect, then braking consistency is improved, but system complexity increases
Solution Approach 1:
By segmenting motor output torque into energy regeneration torque and gradient compensation torque, the calibration process is simplified. The energy regeneration torque can be calibrated using standard procedures based on accelerator pedal opening and vehicle speed, while the gradient compensation torque is automatically calculated based on gradient information, reducing the overall calibration complexity
Solution Approach 2:
Gradient information serves as an intermediary parameter that automatically adjusts the motor output torque without requiring complex calibration procedures. The gradient compensation torque acts as a mediator that bridges the gap between energy regeneration and braking consistency, simplifying the control strategy while improving performance
Data Source
AI summary
A control method and apparatus are provided. The method includes: obtaining opening information of an accelerator pedal of a vehicle and gradient information; determining a motor output torque based on the opening information of the accelerator pedal and the gradient information; and determining a first hydraulic brake torque based on a required braking torque and the motor output torque. The control method and apparatus can be used in intelligent vehicles or electric vehicles, so that driving consistency of a user can be improved, and an unexpected hazard caused by inconsistent braking effects can be avoided.