Dual-Controller Brake Pressure Supply With Sensor Failover
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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 system, where two controllers and hydraulic pressure suppliers work in tandem, with one controller connected to a separate power source and wheel speed sensor, allowing or blocking currents to ensure stable operation even in failure states, and a diode is used to prevent current flow issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sensor is shared between the first controller and the second controller, then the device complexity is reduced, but the reliability of sensing information may deteriorate when electrical failures occur
Solution Approach 1:
The patent divides the control system into two independent controllers (first controller and second controller), each capable of independently controlling a hydraulic pressure supplier. This segmentation allows the system to maintain functionality even if one controller fails, thereby improving reliability while using a single shared sensor to reduce complexity.
Solution Approach 2:
The patent changes the operational state parameters of the single sensor by controlling which controller accesses the sensor through switches. The first switch controls current from the first power source to the sensor, and the second switch controls current from the second power source to the sensor. This allows dynamic parameter changes in sensor operation mode to ensure reliable sensing information under different failure conditions.
2Speed
If the first controller directly controls the wheel speed sensor, then the control response speed is improved, but the system becomes vulnerable to electrical failures in the first controller
Solution Approach 1:
The patent introduces switches as intermediary components between the controllers and the wheel speed sensor. The first switch and second switch act as mediators that can selectively connect or disconnect the sensor from different power sources and controllers. This intermediary mechanism allows rapid response when switches are closed while providing failover capability when switches need to redirect to backup paths.
Solution Approach 2:
The patent prepares backup control paths in advance by establishing the second controller and second power source as standby systems. The switches are configured to automatically or manually redirect sensor current to the backup path when the primary path fails, providing beforehand cushioning against electrical failures and ensuring continuous operation.
3Reliability
If dual hydraulic pressure suppliers and controllers are implemented, then the reliability is improved through redundancy, but the device complexity increases
Solution Approach 1:
The patent merges the sensing function into a single shared wheel speed sensor that serves both the first controller and the second controller. By combining the sensor resource while maintaining separate control paths, the system achieves redundancy in control and power supply without proportionally increasing the total component count, thus balancing reliability improvement with complexity management.
Data Source
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.