Brake Judder Detection via Sensor Data Storage
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Solution Overview
Problem
Current methods for determining brake judder in vehicles are time-consuming and costly, often leading to unnecessary maintenance due to the need for separate driving reproduction tests and expensive disc thickness measurements, resulting in incorrect maintenance.
Innovation Solution
A system and method utilizing a hydraulic sensor, steering wheel torque sensor, acceleration sensor, and controller to detect brake judder by analyzing signals during braking, storing information in a storage device for easy recognition of judder occurrence, thereby eliminating the need for separate testing when maintaining the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If driving reproduction test is performed to determine brake judder, then accuracy of judder detection is improved, but time consumption and maintenance cost increase
Solution Approach 1:
The system performs preliminary detection of brake judder during normal vehicle operation using sensors and controller. The detection results are stored in advance, so when maintenance is needed, the pre-stored detection data can be directly retrieved without performing time-consuming driving reproduction tests, thus resolving the contradiction between detection accuracy and time consumption
Solution Approach 2:
Instead of performing actual driving reproduction tests during maintenance, the system uses copied data from sensors (hydraulic pressure, acceleration, steering torque) that were recorded during normal operation. This copying of operational data allows accurate judder assessment without repeating the actual braking conditions, reducing maintenance time while maintaining detection accuracy
2Measurement precision
If disc thickness measurement is performed to determine brake judder, then measurement precision is improved, but equipment cost and time consumption increase
Solution Approach 1:
The system replaces expensive mechanical disc thickness measurement equipment with electronic sensors (hydraulic pressure sensor, acceleration sensor, steering torque sensor) and a controller. The controller processes sensor signals to detect brake judder indirectly, eliminating the need for specialized mechanical measuring devices while maintaining diagnostic capability
Solution Approach 2:
The system uses intermediary parameters (hydraulic pressure fluctuations, acceleration variations, steering torque changes) to indirectly detect brake judder caused by disc thickness variation. Instead of directly measuring disc thickness, the sensors detect the effects of judder on other vehicle parameters, providing an alternative measurement approach that avoids expensive direct measurement equipment
3Productivity
If brake disc is replaced without checking procedure, then maintenance speed is improved, but maintenance accuracy deteriorates leading to incorrect maintenance
Solution Approach 1:
The system performs preliminary detection and stores brake judder status during normal vehicle operation. Before maintenance is performed, the pre-stored detection results are retrieved to confirm whether brake disc replacement is actually needed. This preliminary knowledge prevents unnecessary replacements while ensuring needed maintenance is performed, resolving the contradiction between maintenance speed and correctness
Solution Approach 2:
The system provides feedback about brake judder status to the maintenance process. The controller analyzes sensor data and provides clear indicators about whether judder is present, enabling mechanics to make informed decisions about whether brake disc replacement is necessary. This feedback mechanism prevents both unnecessary maintenance and missed repairs, improving overall maintenance reliability
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
Enables accurate and efficient identification of brake judder, distinguishing it from vibrations caused by uneven road surfaces, reducing excessive maintenance and costs by allowing real-time detection and storage of judder events for later verification.
Implementation Method 1
a hydraulic sensor configured for detecting hydraulic pressure which is distributed from a master cylinder to wheel cylinders of the vehicle
Implementation Method 2
a steering wheel torque sensor configured for detecting steering torque of a steering wheel of the vehicle
Implementation Method 3
an acceleration sensor configured for detecting transverse deceleration and longitudinal deceleration of the vehicle
Implementation Method 4
a controller determining whether judder was generated, on the basis of a detecting signal from the steering wheel torque sensor and a detecting signal from the acceleration sensor, including a detecting signal from the hydraulic sensor when the vehicle is braked
Data Source
AI summary
A system and method for detecting brake judder in a vehicle may include storing information related to determining whether judder was generated when a vehicle was braked, and facilitating easy recognition of a vehicle in which judder was generated, on the basis of stored information without performing methods such as a separate driving reproduction test and a disc thickness measurement test when maintaining later.