Electric Brake Valve Current Hold During Controller Failover
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Solution Overview
Problem
In electric brake systems, an instantaneous current drop during controller transition can cause electronic valves to stop operating, leading to instability and compromised braking performance when a malfunctioning controller is replaced by a redundant controller.
Innovation Solution
The system includes a first processor controlling electronic valves and a second processor that corrects the target current of these valves, increasing it to a maximum current to ensure operability and then reducing it to a hold current, maintaining the on state, and can re-operate the valve by supplying a current greater than the cut-in current during controller failure transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a redundant controller is introduced to replace a malfunctioning controller, then system reliability is improved, but instantaneous current drop occurs during controller transition causing valve operation instability
Solution Approach 1:
The patent applies preliminary action by having the second processor pre-load and maintain valve control signals in standby state before the actual controller failure occurs. This allows the redundant controller to immediately take over without causing current drops or valve operation interruptions, thus maintaining valve stability while improving system reliability through redundancy.
2Reliability
If controller redundancy is implemented for failover, then braking system safety is improved, but current interruption occurs during controller switching causing valve release
Solution Approach 1:
The patent implements continuity of useful action by maintaining continuous current supply to the valve throughout the controller transition process. The second processor is configured to continuously provide control signals to the valve during the failover from the first processor, ensuring that the valve remains in its operational state without release, thus eliminating the harmful current interruption effect while maintaining braking system safety.
3Stability of the object's composition
If instantaneous current drop is prevented during controller transition, then valve operational stability is improved, but controller complexity increases due to dual processor architecture
Solution Approach 1:
The patent applies segmentation by dividing the controller into two independent processors with distinct functional roles: the first processor handles normal valve control operations while the second processor is dedicated to monitoring and preparing failover signals. This segmentation allows the system to maintain simple, deterministic control logic in each processor while achieving overall system stability through the coordinated division of labor, thus managing complexity rather than simply increasing it.
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 approach stabilizes the operation of electronic valves and ensures consistent braking performance by maintaining valve functionality even during instantaneous current drops, thereby securing the stability and effectiveness of the braking system.
Implementation Method 1
a hydraulic pressure supply device configured to operate a hydraulic piston by a motor and generate a hydraulic pressure of the pressurizing medium
Implementation Method 2
a hydraulic pressure supply device configured to operate a hydraulic piston by a motor
Data Source
AI summary
Disclosed herein is an electric brake system including a hydraulic circuit configured to guide a pressurizing medium to a wheel cylinder, a plurality of electronic valves configured to open or close a flow path of the hydraulic circuit, and a controller electrically connected to the plurality of electronic valves. The controller includes a first processor configured to control the plurality of electronic valves and a second processor configured to control the plurality of electronic valves based on state information received from the first processor. While the first processor maintains the opening or closing of at least one electronic valve, the second processor is configured to provide an electrical signal to open an opened at least one electronic valve or an electrical signal to close a closed at least one electronic valve based on the state information received from the first processor.