Brake Control for Mixed ABS and Regenerative Axle Braking
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Solution Overview
Problem
Existing brake control systems in electric and hybrid vehicles fail to maximize deceleration and energy recuperation on low-friction surfaces by fully utilizing the available coefficient of friction, particularly when one axle is under anti-lock braking system (ABS) control and the other is not, leading to underbraking and deceleration fluctuations.
Innovation Solution
A brake control system that maintains regenerative braking on the axle not under ABS control while activating ABS on the other axle, ensuring smooth transition from regenerative to mechanical braking, thereby maximizing deceleration and energy recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake control system continuously monitors brake pad wear and communicates with the vehicle control unit, then the reliability and safety of the brake system is improved, but the device complexity and energy consumption increase
Solution Approach 1:
The brake control system is divided into independent functional modules: a wear detection unit that measures brake pad thickness, a communication unit that exchanges data with the vehicle control unit, and a control unit that processes information and generates warnings. This segmentation allows each module to perform its specific function efficiently while maintaining overall system reliability without excessive complexity.
Solution Approach 2:
The system implements a feedback mechanism where the wear detection unit continuously monitors brake pad thickness, communicates wear status to the control unit, which then communicates with the vehicle control unit. When wear exceeds a threshold, the system generates a warning signal that feeds back to the driver. This closed-loop feedback ensures reliable brake monitoring while keeping the control logic manageable.
2Measurement precision
If the brake control system implements continuous monitoring and communication protocols, then the measurement precision of brake pad wear is improved, but the use of energy increases
Solution Approach 1:
Instead of truly continuous monitoring, the system performs wear detection at periodic intervals during brake operations. The wear detection unit measures brake pad thickness at scheduled moments when the brake is applied, rather than maintaining constant measurement. This periodic action maintains measurement precision for safety-critical decisions while significantly reducing energy consumption compared to continuous operation.
Solution Approach 2:
The brake control system leverages existing brake operations to perform wear detection. The wear measurement is integrated into the normal brake application process, using the existing mechanical movement and electrical systems already present in the vehicle. This self-service approach allows precise wear measurement without requiring additional energy-consuming dedicated measurement operations.
3Productivity
If the system stores and processes large amounts of brake operation data, then the productivity and diagnostic capability are improved, but the device complexity and storage requirements increase
Solution Approach 1:
The system extracts and stores only the most critical brake operation parameters and wear data, rather than retaining all possible operational data. Key metrics such as brake pad thickness, brake application force, and wear rate are selectively captured and stored in the control unit. This extraction approach maintains high diagnostic capability for safety-critical issues while minimizing data storage requirements and processing complexity.
Solution Approach 2:
The system transforms raw brake operation data into meaningful diagnostic parameters through processing. Instead of storing and analyzing all raw sensor signals, the control unit converts them into standardized wear indicators, threshold comparisons, and diagnostic codes. This parameter transformation simplifies data storage requirements and reduces processing complexity while maintaining enhanced diagnostic capability through standardized, actionable metrics.
Data Source
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AI summary
The invention relates to a method for operating a brake control system for a vehicle comprising a first axle and a second axle that follows the first axle in the direction of travel of the vehicle, wherein a regenerative brake is associated with the axles and a brake having anti-lock control is associated with the first axle. The invention also relates to a corresponding brake control system, to a computer program, and to a computer-readable storage medium. In the method: a) an overrun signal representative of overrun is provided to the brake control system (S1); b) the regenerative braking is activated according to the overrun signal (S2); c) a braking signal representative of vehicle brake actuation is provided to the brake control system (S3); d) the brake is triggered according to the braking signal (S4); e) a locking signal representative of active anti-lock control of the brake is provided to the brake control system (S5); and f) the regenerative brake associated with the first axle is deactivated according to the locking signal, while maintaining the activation of the regenerative brake associated with the second axle (S6).