Electronic Brake System Valve Synchronization for Pressure Error Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The electronic brake system experiences a significant error between estimated and actual braking pressures due to repeated opening and closing of valves during ABS and TCS operations, leading to instability in braking control.
Innovation Solution
The system includes valves that control hydraulic pressure delivery to wheel cylinders, a pressure measurer, and a controller that synchronizes the measured hydraulic pressure with the pressure of all open valves by detecting and managing the number of valve openings and closures within a predetermined time, ensuring equilibrium and reducing pressure discrepancies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If valves are repeatedly opened and closed to control hydraulic pressure during ABS and TCS operations, then braking control functionality is improved, but error between estimated and actual braking pressure increases
Solution Approach 1:
The system performs preliminary synchronization of the pressure sensor reading with the actual wheel cylinder pressure by detecting when all valves are open. This preliminary calibration establishes an accurate baseline pressure value before ABS/TCS operations begin, ensuring that subsequent pressure measurements during valve operations remain accurate.
Solution Approach 2:
The controller continuously monitors valve states and pressure sensor readings, and provides feedback to determine when synchronization should occur. When all valves are detected to be open, the system uses the pressure sensor reading to synchronize and update the actual braking pressure value, creating a closed-loop feedback mechanism that maintains accuracy despite repeated valve operations.
2Reliability
If valves are repeatedly opened and closed during braking control, then wheel lock prevention is improved, but stability of braking pressure control deteriorates
Solution Approach 1:
The system performs preliminary synchronization of the pressure sensor reading with the actual wheel cylinder pressure by detecting when all valves are open. This preliminary calibration establishes an accurate baseline pressure value before ABS/TCS operations begin, ensuring that subsequent pressure measurements during valve operations remain accurate.
Solution Approach 2:
The controller continuously monitors valve states and pressure sensor readings, and provides feedback to determine when synchronization should occur. When all valves are detected to be open, the system uses the pressure sensor reading to synchronize and update the actual braking pressure value, creating a closed-loop feedback mechanism that maintains accuracy despite repeated valve operations.
3Reliability
If hydraulic pressure is frequently adjusted to prevent wheel locking, then safety is improved, but error between estimated and actual pressure increases
Solution Approach 1:
The system performs preliminary synchronization of the pressure sensor reading with the actual wheel cylinder pressure by detecting when all valves are open. This preliminary calibration establishes an accurate baseline pressure value before ABS/TCS operations begin, ensuring that subsequent pressure measurements during valve operations remain accurate.
Solution Approach 2:
The controller continuously monitors valve states and pressure sensor readings, and provides feedback to determine when synchronization should occur. When all valves are detected to be open, the system uses the pressure sensor reading to synchronize and update the actual braking pressure value, creating a closed-loop feedback mechanism that maintains accuracy despite repeated valve operations.
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 minimizes the error between estimated and actual braking pressures, enhancing the stability and accuracy of braking control by synchronizing hydraulic pressures across wheel cylinders, thereby improving the overall performance of the electronic brake system.
Implementation Method 1
a pressure sensor configured to measure a pressure of the hydraulic circuit
Implementation Method 2
the electronic control unit synchronizes a pressure of the hydraulic circuit with a pressure of the wheel cylinder having all of the inlet valves open
Data Source
AI summary
Disclosed herein is an electronic brake system, which includes at least one or more valves provided to control a hydraulic pressure delivered to wheel cylinders provided in wheels, a pressure measurer configured to measure the hydraulic pressure delivered to the wheel cylinders provided in the wheels, and a controller configured to open at least one or more valves that deliver the hydraulic pressure to a corresponding wheel cylinder and close at least one or more valves that deliver the hydraulic pressure to the remaining wheel cylinders other than the corresponding wheel cylinder when the at least one or more valves are detected as being opened or closed a predetermined number of times or more during a predetermined time period, and synchronize the measured hydraulic pressure with a hydraulic pressure of the wheel cylinder having all of the at least one or more valves open.