Electronic Brake System Hydraulic Circuit Failure Detection
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Solution Overview
Problem
Active hydraulic booster systems in vehicles face a dangerous situation where a braking force is not generated due to hydraulic circuit failures, such as leaks, leading to insufficient brake fluid pressure and potential accidents.
Innovation Solution
An electronic brake system with pressure sensors and a controller that detect hydraulic circuit failures by measuring pressure slopes and changes, and closes affected valves to reroute braking pressure to functioning circuits, ensuring continuous braking performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the HPU continuously generates hydraulic pressure to ensure braking availability, then braking readiness is improved, but the risk of brake fluid exhaustion and loss of braking force increases when hydraulic circuit failures occur
Solution Approach 1:
The system performs preliminary detection of hydraulic circuit failures by monitoring pressure changes in the BC before brake fluid exhaustion occurs. Pressure sensors detect abnormal pressure drops that indicate leaks or failures, allowing the system to identify problems before they lead to complete brake fluid depletion and loss of braking capability.
Solution Approach 2:
The system implements continuous feedback monitoring of hydraulic pressure in the BC and individual hydraulic circuits. When pressure deviations exceed predetermined thresholds, the system provides feedback signals to the control unit, which then adjusts HPU operation or activates warning systems to prevent brake fluid exhaustion and maintain braking safety.
2Reliability
If pressure sensors and continuous monitoring are added to detect hydraulic circuit failures, then safety and failure detection capability are improved, but device complexity increases
Solution Approach 1:
The pressure sensors serve multiple functions: they monitor BC pressure, detect hydraulic circuit failures, measure pressure changes for diagnostic purposes, and provide data for both driver warnings and automated system responses. This multi-functionality reduces the need for separate dedicated sensors for each monitoring task, thereby limiting the increase in device complexity.
3Reliability
If the system isolates failed hydraulic circuits and controls braking using only functioning circuits, then braking performance after failure is maintained, but braking force distribution and vehicle control capability are reduced
Solution Approach 1:
The hydraulic brake system is divided into separate hydraulic circuits (e.g., left and right sides, or front and rear axles). When a failure is detected in one circuit, the system isolates that circuit using isolation valves, allowing the remaining functional circuits to continue providing braking force. This segmentation enables partial braking functionality to be maintained even when part of the system fails.
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
Prevents accidents by anticipating and managing hydraulic circuit failures, maintaining necessary braking performance even after a hydraulic brake circuit failure occurs, ensuring safety and compliance with vehicle braking regulations.
Implementation Method 1
a pressure sensor including a first pressure sensor configured to measure a hydraulic pressure of the accumulator, a second pressure sensor configured to measure a hydraulic pressure of the first hydraulic circuit, and a third pressure sensor configured to measure a hydraulic pressure of the second hydraulic circuit
Implementation Method 2
a motor configured to drive a pump for pumping brake oil from a reservoir of a master cylinder
Implementation Method 3
an accumulator configured to store the pumped brake oil according to operation of the pump driven by the motor
Data Source
AI summary
Electronic brake system is disclosed. An electronic brake system includes, a pressure sensor including a first pressure sensor configured to measure a hydraulic pressure of the accumulator, a second pressure sensor configured to measure a hydraulic pressure of the first hydraulic circuit, and a third pressure sensor configured to measure a hydraulic pressure of the second hydraulic circuit, a driver including one or more apply valves and release valves configured to control the hydraulic pressures of the first hydraulic circuit and the second hydraulic circuit, a determiner configured to determine that at least one of the first hydraulic circuit and the second hydraulic circuit has failed when an absolute value of a slope of the pressure measured by the first pressure sensor is greater than a preset first threshold value and the pressure measured by the first pressure sensor is less than a preset second threshold value and a controller configured to close apply valves of the first hydraulic circuit and the second hydraulic circuit when the failure has been determined, determine that a leak has occurred in one of the first and second hydraulic circuits having an amount of pressure change greater than that of the other hydraulic circuit measured on the basis of the second pressure sensor and the third pressure sensor, and control braking using only the hydraulic circuit operating normally.