Brake Control System for Electric Drive Vehicles
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Solution Overview
Problem
Existing braking control systems for electric drive vehicles in earth-moving machines lack stability and often interfere with vehicle performance, particularly during retarding or regenerating modes, and do not effectively handle system uncertainties.
Innovation Solution
A braking control system that senses actual and desired motor operating parameters to control both the motor and brake, using a control unit with a motor controller and a brake controller to determine outputs for motor and brake control, ensuring stability and non-interference with motor speed control within power limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brake control is applied to dissipate energy during retarding mode, then vehicle safety and performance are improved, but motor speed control may be interfered with and system stability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the brake controller receives the motor control output as input and uses it to determine the brake control output. This closed-loop feedback ensures that brake application is coordinated with motor control actions, preventing instability while maintaining safety during retarding mode operation.
Solution Approach 2:
The system determines the desired motor operating parameter before applying brake control. By planning the motor control output in advance and using it to guide subsequent brake control decisions, the system prevents interference with motor speed control while ensuring safe energy dissipation during retarding modes.
2Productivity
If brake control is applied to dissipate extra energy, then vehicle performance is improved, but interference with motor speed control increases
Solution Approach 1:
The patent merges motor control and brake control into a unified control system where the brake controller receives motor control output as input. This integration ensures that brake control actions are coordinated with motor control, allowing energy dissipation to improve vehicle performance without interfering with motor speed control within power limits.
3Extent of automation
If integrated motor/brake control is implemented, then automatic control capability is improved, but system complexity increases
Solution Approach 1:
The control system is segmented into distinct functional components: a motor controller that determines motor control output based on desired motor operating parameters, and a brake controller that determines brake control output based on motor control output. This segmentation provides automatic control capability while managing system complexity through modular design with clear interfaces between components.
Data Source
AI summary
A method is provided for controlling braking in a vehicle having a motor and a brake. The method includes sensing an actual operating parameter of the motor and receiving a desired operating parameter of the motor. The motor is controlled based on the actual operating parameter and the desired operating parameter of the motor. The brake is controlled based on the actual operating parameter and the desired operating parameter of the motor and an output from the motor control.