Electronic Mechanical Brake Redundancy for Backup Wheel Braking
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Solution Overview
Problem
Conventional electronic mechanical brake systems fail to generate emergency braking when both center controllers and CAN communication lines experience errors, leading to instability and unreliability.
Innovation Solution
Incorporation of duplex controllers and redundant communication lines in the electronic mechanical brake system, allowing wheel controllers to independently generate braking commands and share wheel speed information to ensure emergency braking even in the event of controller or communication failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundancy is implemented in center controllers and CAN communication lines, then reliability is improved, but device complexity increases
Solution Approach 1:
The system divides the braking control function into two independent pathways: normal braking control through the center controller and CAN communication, and emergency braking control through the wheel controller's autonomous operation. This segmentation allows the system to maintain emergency braking capability even when the central control system fails, resolving the contradiction between reliability and complexity by distributing critical functions across multiple independent components.
Solution Approach 2:
The wheel controller is pre-programmed with emergency braking algorithms and parameters before failure occurs. When normal communication fails, the wheel controller can immediately execute pre-stored emergency braking commands without waiting for center controller instructions. This preliminary preparation ensures rapid response in emergency situations while maintaining system simplicity.
2Reliability
If wheel controllers can independently generate braking commands, then emergency braking capability is improved, but control stability worsens
Solution Approach 1:
The wheel controller dynamically switches between normal operating mode (receiving commands from center controller) and emergency operating mode (autonomous operation). This dynamic adaptability allows the system to maintain stability during normal operation while gaining emergency independence when needed, resolving the contradiction between emergency capability and operational stability.
Solution Approach 2:
The wheel controller continuously monitors communication status with the center controller and wheel speed sensor data, using this feedback to determine whether to operate in normal or emergency mode. This feedback mechanism ensures stable transition between operating modes and maintains braking stability while enabling emergency independence.
Data Source
AI summary
An electronic mechanical brake comprising: a pedal sensor for sensing a stepping force corresponding to a driver's intention to brake; a center controller for issuing a braking command corresponding to the stepping force and for securing braking redundancy based on a first controller and a second controller; a plurality of wheel controllers for receiving a braking command from the center controller and generating a braking force based on the received braking command using electronic mechanical brakes respectively disposed on a right front wheel, a left front wheel, a right rear wheel, and a left rear wheel; a plurality of wheel speed sensors respectively connected to the plurality of wheel controllers to measure the speed of the right front wheel, the left front wheel, the right rear wheel, and the left rear wheel; and a communications unit including a first communication line for transmitting and receiving signals between the center controller and the plurality of wheel controllers and a second communication line for securing communication redundancy with the first communication line, wherein the plurality of wheel controllers perform backup braking when an error occurs in either or both of the center controller and the communications unit.