Redundant Brake Pressure Control With Shared Wheel Speed Sensing
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Solution Overview
Problem
Existing brake systems face challenges in stably obtaining sensing information, particularly when electrical failures occur in the hydraulic pressure supply or auxiliary supply devices, which can disrupt the reliable operation of the braking system.
Innovation Solution
A brake system is designed with a dual hydraulic pressure supply and control mechanism, where two controllers, connected to different power sources and wheel speed sensors, work in tandem to ensure continuous operation even if one fails, using switches and processors to manage current flow and sensor data, and a diode to prevent current flow issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sensor is used for sensing information, then device complexity is reduced, but reliability deteriorates when electrical failures occur
Solution Approach 1:
The patent merges the sensing information acquisition function into a single wheel speed sensor that serves both the first and second controllers. The sensor output is shared between two independent control systems, reducing component quantity while maintaining reliability through redundant control paths. The first controller receives sensing information directly from the sensor, and the second controller receives it either directly or through the first controller, ensuring both controllers have access to the same sensing data without requiring duplicate sensors.
2Reliability
If redundant controllers with separate power sources are used, then reliability is improved, but device complexity increases
Solution Approach 1:
The control system is segmented into two independent controller units, each with its own power source (first power source and second power source). This segmentation allows the system to maintain functionality even if one controller or power source fails. The first controller manages the first hydraulic pressure supplier while the second controller manages the second hydraulic pressure supplier, creating modular redundancy that improves reliability without requiring complete system duplication.
Solution Approach 2:
The single wheel speed sensor serves multiple functions by providing sensing information to both the first controller and the second controller. This multi-functionality reduces the need for duplicate sensors while ensuring both redundant controllers have access to necessary operational data. The sensor's output is universally utilized across both control paths, maintaining reliability with reduced complexity.
3Reliability
If switches are added to manage current flow between controllers, then reliability is improved, but device complexity increases
Solution Approach 1:
Switches are introduced as intermediary components between the first controller, second controller, and wheel speed sensor to manage current flow. The first switch controls current from the first power source to the sensor, while the second switch controls current from the second power source to the sensor. These intermediary switches enable reliable current management and failover capability without requiring complex circuit redesign, as they simply gate the existing current paths.
Data Source
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AI summary
A brake system including: a first hydraulic pressure supplier connected to a wheel cylinder; a second hydraulic pressure supplier connected to the wheel cylinder; a first controller configured to control the first hydraulic pressure supplier to provide a first hydraulic pressure to the wheel cylinder; and a second controller configured to control the second hydraulic pressure supplier to provide a second hydraulic pressure to the wheel cylinder. The first controller may be connected to a first power source and a wheel speed sensor, and supply first current of the first power source to the wheel speed sensor via the second controller. The second controller may be connected to a second power source and the wheel speed sensor, and allow or block the first current of the first power source to the wheel speed sensor and allow or block second current of the second power source to the wheel speed sensor.