Electric Braking System Self-Test Method
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric braking systems lack an efficient method for self-testing, which is crucial for ensuring the reliability and integrity of the braking mechanism, particularly in detecting fluid leaks and air presence within the hydraulic circuit.
Innovation Solution
The proposed electric braking system incorporates a self-test method that operates the second piston while keeping specific valves closed and open, monitoring pressure and piston position measurements to compare with reference values, and includes a simulator unit to provide reaction force corresponding to pedal effort, ensuring efficient detection of fluid leaks and air presence without pressing the wheel brakes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a self-test method is implemented in the electric braking system, then system reliability is improved through detection of fluid leaks and air presence, but device complexity increases due to additional valves and control mechanisms
Solution Approach 1:
The self-test method performs preliminary detection of fluid leaks and air presence before actual braking operations. The system activates the second piston and controls valve configurations in advance to test the hydraulic circuit integrity, ensuring that potential issues are identified before they affect normal braking function.
Solution Approach 2:
The electric braking system performs self-diagnosis through the self-test method, where the system tests itself without requiring external testing equipment. The control unit automatically activates the second piston, monitors pressure changes, and detects abnormalities in the hydraulic circuit, enabling the system to self-verify its operational integrity.
2Difficulty of detecting and measuring
If the second piston is operated for self-testing, then detection capability is improved, but loss of time occurs during the self-test process
Solution Approach 1:
The self-test method employs periodic operation of the second piston, where the piston moves between extended and retracted positions in a cyclic manner. This periodic action allows the system to efficiently test the hydraulic circuit by creating pressure variations at regular intervals, enabling rapid detection of fluid leaks or air presence without requiring continuous operation.
3Measurement precision
If multiple valves are controlled during self-test, then measurement precision is improved for detecting fluid leaks and air presence, but device complexity increases
Solution Approach 1:
The self-test method segments the hydraulic circuit testing into distinct phases by controlling different valve configurations. The first valve configuration isolates the pump chamber for leak detection, while the second configuration tests for air presence. This segmentation allows precise measurement of pressure changes in specific circuit sections, improving detection accuracy without requiring a completely redesigned system.
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 enables effective self-testing of the electric braking system, allowing for the detection of fluid leaks and air presence without engaging the wheel brakes, thereby ensuring system reliability and integrity by comparing measured values with reference standards.
Implementation Method 1
a pressure applier having a second piston operating by receiving power and a pump chamber with the volume varying by displacement of the second piston, and hydraulically coupled to wheel brakes
Implementation Method 2
each inlet line comprises a check valve and an inlet valve allowing one-way flow from the pump chamber to the wheel brake
Data Source
AI summary
Am electric braking system is disclosed. The electric braking system comprising: a cylinder unit having a first piston connected to a brake pedal, a cylinder chamber with the volume varying by displacement of the first piston, and a pressing chamber with the volume varying by a pressing member, and sending an intention of braking to an electronic control unit; a reservoir storing a working fluid, a pressure applier having a second piston operating by receiving power and a pump chamber with the volume varying by displacement of the second piston, and hydraulically coupled to wheel brakes, a reservoir line connecting the cylinder chamber and the reservoir and having a reservoir valve; and a pump reservoir line connecting the pump chamber and the reservoir and having a dump valve.