Brake Valve Drive Circuit Isolation Against Common Mode Faults
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Solution Overview
Problem
Conventional brake control systems in vehicles suffer from a loss of entire system function when a common mode fault occurs between the main ECU and the redundant ECU, particularly due to overvoltage or short circuit in valve drive circuits.
Innovation Solution
The apparatus for brake control includes separate valve drive circuits with backward voltage prevention elements to prevent faults from being transmitted between circuits, ensuring that a fault in one circuit does not affect the others.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundancy design is applied to the ECU in brake control systems, then system reliability is improved, but the entire system function is lost when a common mode fault occurs between main ECU and redundant ECU
Solution Approach 1:
The patent divides the brake control system into multiple independent valve drive circuits (first valve drive circuit and second valve drive circuit), each with separate power sources and backward voltage prevention elements. This segmentation ensures that a fault in one circuit does not propagate to other circuits, eliminating common mode fault vulnerability while maintaining redundancy.
2Device complexity
If valve drive circuits are configured without isolation protection, then device complexity is reduced, but faults due to overvoltage or short circuit can be transmitted between circuits causing complete system failure
Solution Approach 1:
The patent introduces backward voltage prevention elements as intermediary components between power sources and valve drive circuits. These elements act as protective mediators that block fault transmission (overvoltage and short circuits) between circuits while allowing normal operation, thus improving reliability without significantly increasing complexity.
3Reliability
If backward voltage prevention elements are added to separate valve drive circuits, then fault isolation and system safety are improved, but device complexity increases
Solution Approach 1:
The patent segments the brake control system into independent valve drive circuits, each equipped with its own backward voltage prevention element. This segmentation strategy distributes the protective function across multiple simple units rather than requiring a single complex protection mechanism, achieving reliable fault isolation with minimal increase in overall system complexity.
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 solution effectively prevents the entire loss of braking force by isolating faults within individual valve drive circuits, thereby enhancing the fail-safe performance and safety reliability of the brake control system.
Implementation Method 1
a first backward voltage prevention element disposed between a power source of the first valve driving circuit and the first valve driving circuit to block backward voltage generated on the power source side of the first valve driving circuit
Data Source
AI summary
An apparatus for brake control may include a first valve group comprising valves included in a hydraulic circuit configured to supply hydraulic pressure for braking of a vehicle; a first valve drive circuit configured to drive the valves comprised in the first valve group; a first backward voltage prevention element connected between a power source and the first valve drive circuit to block backward voltage generated at a power source side of the first valve drive circuit; a second valve group included in the hydraulic circuit and comprising valves included in the hydraulic circuit; a second valve driving circuit configured to drive the valves comprised in the second valve group; and a second backward voltage prevention element connected between a power source and the second valve drive circuit to block backward voltage generated at a power source side of the second valve drive circuit.