Brake Control Architecture for Additional Axle Diagnostics
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Solution Overview
Problem
In vehicles with higher levels of automation, especially commercial vehicles, there is a need for an improved diagnostic option for brake systems when the driver is not monitoring the operation, and existing systems face challenges with additional control units increasing installation space and costs.
Innovation Solution
A brake system with multiple wheel speed sensors on main and additional axles, connected to two control units via main and additional data lines, allowing for efficient generation and processing of brake control signals, enabling safe driving operations and extended diagnostic capabilities without the need for additional control units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional control units are installed to provide extended diagnostic options in automated vehicles, then diagnostic capability is improved, but installation space and costs increase
Solution Approach 1:
The brake control unit is designed to perform multiple functions: it controls the wheel brakes for braking operations and simultaneously evaluates wheel speed signals from all axles (main and additional) to detect faults and malfunctions. This multi-functionality eliminates the need for separate diagnostic control units, resolving the contradiction between improved diagnostic capability and increased device complexity
Solution Approach 2:
The evaluation function for diagnostic purposes is merged into the existing brake control unit. The control unit combines brake control operations with fault detection and diagnosis functions by processing wheel speed signals from additional axles, thereby integrating diagnostic capabilities without adding separate control units
2Reliability
If wheel speed sensors on additional axles are connected to both control units via main data lines, then diagnostic capability is improved, but wiring complexity increases
Solution Approach 1:
The wiring system is segmented into two types: main data lines connecting wheel speed sensors on main axles to the brake control unit, and additional data lines connecting wheel speed sensors on additional axles to the brake control unit. This segmentation allows the control unit to receive signals from all sensors while maintaining clear functional separation in the wiring architecture
Solution Approach 2:
The brake control unit acts as an intermediary that receives wheel speed signals from both main and additional axles through dedicated data lines. The control unit processes and evaluates all incoming signals to detect faults, thereby simplifying the overall system architecture by centralizing signal evaluation rather than requiring complex interconnections between multiple control units
Data Source
AI summary
A brake system is for the electronically controlled braking of wheels on at least two main axles. The system includes wheel speed sensors on the main axles and on at least one additional axle to output wheel speed signals and two control devices for generating and outputting brake signals. The wheel brakes on the main axles can be controlled according to the brake signals. The sensors on the main axles are connected to the control devices via main data lines such that each control device for each wheel on the main axles, which is assigned a wheel speed sensor, can receive a determined wheel speed via the wheel speed signals. Each wheel speed sensor on at least one additional axle is connected only to one of the control devices via an additional data line. Each control device is connected to at least one of the sensors on the additional axle.