EPB Backup Braking via Steering Controller Redundancy
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Solution Overview
Problem
Hydraulic brake systems face limitations in reaction speed, accuracy, and efficiency due to complexity and weight, while electronic control brake systems like IDB lose essential brake functions when the electronic control unit fails.
Innovation Solution
The EPB module is integrated into the electronic power steering system to provide an independent brake function in case of electronic control brake controller failure, utilizing redundant controllers and wheel speed sensors to ensure braking control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an electronic control brake system is used to improve reaction speed and accuracy, then braking performance is improved, but the system loses all brake functions when the electronic control unit fails
Solution Approach 1:
The patent applies beforehand cushioning by integrating the EPB module into the steering system controller in advance, creating a backup braking capability before the brake controller failure occurs. This allows the system to maintain brake functions even when the primary electronic control unit fails, as the EPB module can independently control the hydraulic brake modules.
2Reliability
If a hydraulic brake system is used to provide braking force, then braking function is achieved, but the system complexity and weight increase, degrading efficiency
Solution Approach 1:
The patent applies universality by making the steering system controller perform multiple functions: it controls both the steering system and the electronic parking brake module. This multi-functionality eliminates the need for a separate dedicated EPB controller, thereby reducing system complexity and component count while maintaining brake function availability.
Solution Approach 2:
The patent applies merging by combining the EPB module with the steering system controller into a single integrated unit. This consolidation reduces the number of separate components and control units, simplifying the overall brake system architecture while ensuring that braking functions remain available even if the primary brake controller fails.
3Reliability
If the EPB module is integrated into the steering system to provide backup brake function, then reliability is improved, but the steering system complexity increases
Solution Approach 1:
The steering system controller is designed to perform multiple functions including both steering control and electronic parking brake control. This multi-functionality approach allows the same controller to manage different systems without requiring additional dedicated control units, thereby minimizing the increase in steering system complexity while ensuring backup brake functionality.
Data Source
AI summary
A brake system may include a plurality of wheel speed sensors respectively installed in a plurality of wheels of a vehicle, a plurality of hydraulic brake modules related to braking of the plurality of wheels, and a first controller configured to perform braking control on the plurality of hydraulic brake modules in response to at least one of a pedal displacement signal, which corresponds to a movement of a brake pedal, and wheel speed signals outputted from the wheel speed sensors, in which when a failure of the first controller is identified, a second controller, which is provided in a steering system of the vehicle, performs braking control on an electronic parking brake, which is provided in at least one of the plurality of wheels, in response to at least one of an operating signal of an EPB switch, the pedal displacement signal, and the wheel speed signals outputted from the wheel speed sensors.