By-Wire Brake System with Dual Control Modules
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Solution Overview
Problem
Conventional motor vehicle braking systems lack redundancy and independence in autonomous control, leading to potential failures in single-point actuation and mechanical interface dependencies, which can compromise braking performance and safety in advanced vehicle systems.
Innovation Solution
A fully by-wire braking system with dual hydraulic brake circuits and control modules, where a virtual driver sends deceleration requests to both control modules, allowing independent operation and redundancy to ensure consistent braking performance without mechanical driver input, utilizing upstream and downstream brake control modules to monitor and adjust pressure for stability and redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single-point actuation braking system is used, then the device complexity is reduced, but the reliability deteriorates due to lack of redundancy
Solution Approach 1:
The braking system is divided into two independent hydraulic brake circuits, where each circuit can independently actuate the brake sets. This segmentation allows one circuit to fail without compromising the other, thereby improving reliability while maintaining manageable complexity through modular design
Solution Approach 2:
The system incorporates redundant control modules and hydraulic circuits that serve as pre-prepared backup systems. When the primary control module or hydraulic circuit fails, the secondary system is already in place and can immediately take over, cushioning against the harmful effect of single-point failures before they compromise braking performance
2Reliability
If mechanical driver input interfaces are used, then the ease of operation is maintained, but the reliability deteriorates due to mechanical interface dependencies
Solution Approach 1:
The system replaces mechanical driver input interfaces with electronic sensors and by-wire actuation systems. These electronic systems detect driver intent through non-mechanical means (such as pedal position sensors) and transmit signals electronically to the control modules, eliminating mechanical interface dependencies while maintaining ease of operation and improving reliability
3Productivity
If autonomous control systems are integrated, then the productivity is improved through automated braking decisions, but the device complexity increases due to multiple control modules
Solution Approach 1:
The autonomous control system is segmented into separate control modules, each responsible for specific braking functions. This modular architecture allows independent development, testing, and maintenance of each control function, managing complexity while enabling sophisticated autonomous braking decisions that improve productivity
Solution Approach 2:
The control modules are designed with multi-functionality, capable of handling both autonomous braking decisions and responding to driver inputs. This universality reduces the need for separate dedicated systems, managing complexity while maintaining high productivity through automated responses
Data Source
AI summary
A brake system for a motor vehicle comprises a first brake set and second brake set. A first hydraulic brake circuit is connected to the first brake set and a second hydraulic brake circuit is connected to the second brake set. Further, a first control module is coupled to the first hydraulic brake circuit and the second hydraulic brake circuit. The first control module is configured to control fluid pressure within both the first hydraulic brake circuit and the second hydraulic brake circuit. A second control module is also coupled to the first hydraulic brake circuit and the second hydraulic brake circuit. The second control module is configured to control fluid pressure within both the first hydraulic brake circuit and the second hydraulic brake circuit independent of the first control module. The first control module is disposed in series with the second control module in the first and the second hydraulic brake circuits. Additionally, a virtual driver sends a deceleration request to the first control module and the second control module. The first control module and the second control module determine a desired pressure based upon the deceleration request. The first brake control module controls fluid pressure within both the first and the second hydraulic brake circuits to perform the deceleration request. The second control module monitors pressure downstream from the first control module and compares the monitored pressure to the desired pressure.