Electromechanical Brake Control with Redundant PWM Controllers
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Solution Overview
Problem
Conventional electromechanical brake systems face instability in braking force due to issues with electronic controllers, leading to inconsistent hydraulic pressure when one or both controllers fail.
Innovation Solution
The system employs two electronic controllers to independently calculate and output PWM duty using a shared current command value, ensuring stable braking even if one controller fails, with each controller handling a portion of the current command value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single electronic controller is used to control the motor for braking, then the device complexity is low, but the reliability deteriorates when the controller fails
Solution Approach 1:
The single electronic controller is segmented into two separate electronic controllers (first electronic controller and second electronic controller). Each controller independently controls a portion of the motor phases, distributing the control function to enhance reliability while maintaining manageable complexity through modular architecture
Solution Approach 2:
The system incorporates redundant controller configuration where both electronic controllers are prepared in advance. If one controller fails, the other can take over to maintain braking function, providing beforehand cushioning against controller failure
2Object-generated harmful factors
If one electronic controller outputs the complete PWM duty, then the control logic is simple, but the heat generation and current requirement increase
Solution Approach 1:
The PWM duty output is segmented between two electronic controllers. The first electronic controller outputs PWM duty for certain phases while the second electronic controller outputs PWM duty for remaining phases, distributing the current load and reducing heat generation in each individual controller
Solution Approach 2:
The two electronic controllers are merged into a coordinated system where both controllers work together to control the three-phase motor. The controllers share control responsibilities and coordinate their PWM outputs to achieve the desired braking torque while distributing thermal load
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
Ensures stable braking force by maintaining functionality with one controller operational, reducing heat generation and improving durability through reduced current demands.
Implementation Method 1
a motor configured to operate for braking of a vehicle
Implementation Method 2
calculate a pulse width modulation (PWM) duty using the calculated current command value
Data Source
AI summary
The present disclosure relates to an electromechanical brake system and a method of operating the same, and the electromechanical brake system includes a motor that operates for braking of a vehicle, a first electronic controller electrically connected to the motor and configured to control driving of the motor, and a second electronic controller electrically connected to the motor and configured to control the driving of the motor, wherein the first electronic controller may calculate a current command value using a pressure command for the braking and outputs a pulse width modulation (PWM) duty using the calculated current command value, and the second electronic controller may output the PWM duty using the current command value calculated by the first electronic controller.