Dual Hydraulic Brake Circuit Layout for Fault-Tolerant Control
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Solution Overview
Problem
Existing electronic brake systems face challenges in efficiently generating and distributing braking force while being costly to manufacture and maintain.
Innovation Solution
The electronic brake system incorporates two independent hydraulic circuits and electric circuits, each with its own hydraulic pressure supply part, electronic control unit, and power supply, allowing for independent operation and improved control over braking force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single hydraulic circuit and electric circuit are used to control all wheel brakes, then the device complexity is reduced, but the reliability decreases because a failure in one circuit would affect all brakes
Solution Approach 1:
The braking system is divided into two independent hydraulic circuits (first and second circuits), each controlling different wheel brakes. Each circuit has its own electronic control unit and power supply, creating segmented independence that prevents failure propagation across the entire system while maintaining manageable complexity through modular design.
2Reliability
If two independent hydraulic circuits and electric circuits are used, then the reliability improves, but the device complexity increases
Solution Approach 1:
The system segments braking functions into two independent circuits, each with dedicated control units and power supplies, achieving reliability through independence while managing complexity via modular architecture
Solution Approach 2:
Each hydraulic circuit and electronic control unit is designed to perform multiple braking functions (normal braking, emergency braking, anti-lock braking) independently, allowing the duplicated components to serve universal purposes rather than requiring specialized different functions for each circuit
3Reliability
If a single power supply sources both electric circuits, then the manufacturing cost is reduced, but the reliability decreases because a power failure would disable all electronic control
Solution Approach 1:
The power supply system is segmented into two independent power sources, one for each electronic control unit. This segmentation ensures that a power failure or electrical fault in one circuit does not affect the other, maintaining braking control reliability while using standard off-the-shelf components to manage manufacturing costs
4Ease of operation
If hydraulic pressure is generated centrally and distributed to all brakes, then the ease of operation is improved, but the manufacturing precision requirements increase due to complex pressure distribution
Solution Approach 1:
The hydraulic pressure generation is segmented into two separate pressure supply units, one for each hydraulic circuit. Each unit generates and distributes pressure independently to its assigned wheel brakes, simplifying the pressure distribution network and reducing manufacturing precision requirements compared to a single centralized distribution system serving all brakes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the efficiency and reliability of the braking system, reduces manufacturing and maintenance costs, and allows for precise control of braking force, even in the event of a failure in one of the electric circuits.
Implementation Method 1
a first hydraulic pressure supply part generating hydraulic pressure
Data Source
AI summary
An electronic brake system is disclosed. The electronic brake system includes a pedal operation part connected to a brake pedal so as to provide better pedal feel to a driver of a vehicle; a first hydraulic circuit which includes two wheel brakes, a first hydraulic pressure supply part generating hydraulic pressure, and a plurality of valves, and is hydraulically connected to the pedal operation part; a second hydraulic circuit which includes the other two wheel brakes, a second hydraulic pressure supply part generating hydraulic pressure, and a plurality of valves, and is hydraulically connected to the pedal operation part; a first electric circuit configured to control the first hydraulic circuit; a second electric circuit configured to control the second hydraulic circuit; and a power-supply source configured to supply power to the first electric circuit and the second electric circuit. The first electric circuit and the second electric circuit are operated independently of each other.