Brake Pad Wear Detection Using Stopping Distance Feedback
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Solution Overview
Problem
Existing brake pad wear monitoring systems require additional sensors and electrical wiring, increasing costs and complicating installation and assembly.
Innovation Solution
A brake pad wear monitoring system that utilizes existing vehicle sensors, such as a brake pedal sensor, wheel speed sensor, pressure sensor, and inclination sensor, to calculate expected and actual stopping distances and determine brake pad wear based on these measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a brake pad wear sensor is installed on a brake pad to detect wear amount, then wear detection capability is improved, but device complexity and cost increase due to additional sensors and electrical wiring
Solution Approach 1:
The patent reuses existing vehicle sensors (brake pedal sensor, wheel speed sensor, pressure sensor) that serve multiple functions. These sensors originally designed for other braking system functions are now also used for brake pad wear detection, eliminating the need for dedicated wear sensors and reducing overall system complexity
Solution Approach 2:
The system uses data already being collected by the vehicle's existing sensor network for wear detection purposes. The sensors serve themselves by providing wear detection capability as an additional function without requiring separate dedicated sensing components
2Measurement precision
If a brake pad wear sensor is installed on a brake pad, then wear detection capability is improved, but product cost increases due to additional sensor and wiring components
Solution Approach 1:
The patent reuses existing vehicle sensors (brake pedal sensor, wheel speed sensor, pressure sensor) that serve multiple functions. These sensors originally designed for other braking system functions are now also used for brake pad wear detection, eliminating the need for dedicated wear sensors and reducing overall system complexity
Solution Approach 2:
The patent combines wear detection functionality with the existing sensor system. By merging the wear detection function into the already-installed sensors and controller, the system eliminates separate wear sensing components and their associated wiring, thereby reducing manufacturing costs
3Device complexity
If existing vehicle sensors are used to monitor brake pad wear, then device complexity is reduced, but measurement precision may be affected
Solution Approach 1:
The system continuously monitors braking parameters (pedal displacement, wheel speed, braking pressure) and uses feedback from these measurements to calculate wear amount. The controller processes the relationship between braking force, stopping distance, and pedal displacement to accurately determine brake pad wear through computational analysis
Solution Approach 2:
The system changes the approach from direct physical measurement to indirect parameter-based calculation. By monitoring changes in braking parameters (stopping distance, pedal displacement, braking pressure) and using these parameter changes to infer wear amount, the system achieves accurate wear measurement without direct contact sensors
Data Source
AI summary
Disclosed herein is a brake pad wear monitoring system including a brake pedal sensor configured to detect the displacement of a brake pedal, a wheel speed sensor configured to detect each wheel speed of a vehicle, a pressure sensor configured to detect the braking pressure of the vehicle, and a controller electrically connected to the wheel speed sensor and the pressure sensor, wherein, when the braking pressure detected through the pressure sensor is higher than a preset pressure during braking of the vehicle, the controller calculates each of an expected stopping distance and an actual stopping distance of the vehicle according to the detected each wheel speed, and based on the expected stopping distance, the actual stopping distance, and the displacement of the brake pedal, the controller determines the wear of a brake pad.