Electro-Mechanical Brake Power Layout for Single-Line Failure
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Solution Overview
Problem
Existing power systems for electronic mechanical brake systems suffer a 50% loss in total braking force when an abnormality occurs in one of the power apparatuses, leading to inadequate deceleration.
Innovation Solution
A power supply apparatus with a redundant power line configuration that maintains minimum required deceleration by distributing braking force based on front and rear wheel ratios, using auxiliary controllers and low voltage batteries to ensure power delivery to critical components even in the event of a power line abnormality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a redundant power apparatus configuration is used, then system reliability is improved, but device complexity increases
Solution Approach 1:
The power system is segmented into multiple independent power lines (first, second, and third power lines), each capable of supplying power to specific wheel controllers. This segmentation allows the system to isolate failures to individual lines while maintaining functionality through other lines, thereby improving reliability without requiring a completely redundant parallel system that would increase complexity excessively.
Solution Approach 2:
Each power line is designed to potentially supply power to multiple wheel controllers, creating a multi-functional power distribution network. The first power line can supply to first and second wheel controllers, the second power line to third and fourth wheel controllers, and the third power line to any combination of wheel controllers. This universality allows the system to maintain braking functionality through various combinations of power lines, improving reliability while avoiding the complexity of dedicated redundant systems.
2Reliability
If backup braking with remaining power apparatus is performed, then system reliability is improved, but braking force is reduced by 50%
Solution Approach 1:
The system applies local quality by enabling different wheel controllers to operate at different braking force levels based on available power lines. When one power line fails, the system doesn't uniformly reduce all braking forces by 50%, but rather maintains full braking capability on wheels supplied by functional power lines while adjusting braking on wheels supplied by the failed line. This localized approach preserves overall braking effectiveness while accommodating the failure.
Solution Approach 2:
The braking force distribution is made dynamic rather than static. The system continuously monitors power line status and dynamically adjusts the braking force applied to each wheel based on which power lines are functional. This dynamic reallocation allows the system to maintain optimal braking performance under varying failure conditions, preventing the fixed 50% force reduction that would occur with static backup braking approaches.
3Reliability
If power is redistributed based on front and rear wheel braking distribution ratio, then braking performance is maintained, but control complexity increases
Solution Approach 1:
The system employs feedback mechanisms where the central controller monitors the operational status of each power line and receives feedback from wheel controllers about their power availability. Based on this feedback, the controller dynamically calculates and adjusts the braking force distribution ratio between front and rear wheels to ensure minimum required deceleration is maintained. This feedback-driven approach automates the complex control decisions, reducing the perceived complexity while maintaining reliable braking performance.
Data Source
AI summary
A power supply apparatus includes a battery and a DC-DC converter converting a voltage value of the battery; a main controller determining commands required for driving and braking of a vehicle; an auxiliary controller controlling driving and braking of the vehicle when the main controller is in a function degraded status or an unfunctional status; left front, right front, left rear and right rear wheel controllers generating a braking force using an electronic mechanical brake mounted on each wheel of the vehicle; a first power line supplying power to the main controller and the left front wheel controller from a power branch point starting from the DC-DC converter; a second power line supplying power to the auxiliary controller and the right front wheel controller from the power branch point; and a third power line supplying power to the left rear and right rear wheel controllers from the power branch point.