Brake Pad State Estimation With Variable Sampling Frequency
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Solution Overview
Problem
Existing brake pad state estimation systems consume significant computational, storage, and communication resources due to continuous calculations and data transmission, especially when the impact on brake performance is low, leading to inefficient resource usage.
Innovation Solution
A brake pad state estimation device and method that variably sets the processing frequency based on vehicle speed and brake pressure, reducing resource consumption by lowering frequency when the impact on brake performance is low and increasing it when the impact is high, allowing for precise calculations without unnecessary resource expenditure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous calculation of brake pad state based on sensor detection information is performed, then measurement precision of brake pad state is improved, but use of energy by moving object increases
Solution Approach 1:
The patent implements periodic calculation of brake pad state instead of continuous calculation. The processor calculates the brake pad state at predetermined time intervals based on sensor detection information, thereby reducing computational resource consumption while maintaining sufficient measurement precision for safety monitoring.
Solution Approach 2:
The patent dynamically adjusts the calculation frequency based on vehicle operating conditions. When the vehicle is stationary or moving at low speed, the calculation interval is extended. When the vehicle moves at high speed, the calculation interval is shortened, optimizing the balance between measurement precision and energy consumption according to actual operational needs.
2Loss of information
If continuous storage of brake pad state calculation results is performed, then loss of information is reduced, but volume of stationary object increases
Solution Approach 1:
The patent extracts and stores only essential brake pad state information rather than continuously storing all calculation results. The storage device retains critical data needed for safety monitoring and failure detection, removing unnecessary data to minimize storage resource consumption while preventing information loss.
3Reliability
If continuous transmission of brake pad state results is performed, then reliability of information transfer is improved, but use of energy by moving object increases
Solution Approach 1:
The patent transmits brake pad state information periodically rather than continuously. The communication unit sends calculated brake pad state results at predetermined intervals to external devices, ensuring reliable information transfer for safety monitoring while significantly reducing communication resource consumption and energy usage.
4Measurement precision
If high processing frequency is maintained, then measurement precision of brake pad state is improved, but productivity of resource allocation deteriorates
Solution Approach 1:
The patent dynamically adjusts processing frequency based on vehicle speed and operational conditions. When the vehicle is stationary or moving at low speed, the processing frequency is reduced. When the vehicle moves at high speed, the processing frequency is increased, thereby improving resource allocation efficiency while maintaining measurement precision when it is most critical.
Data Source
AI summary
A brake pad state estimation device estimates a brake pad state including at least one of a wear volume and a temperature of a brake pad of a vehicle. The brake pad state estimation device performs: a brake pad state calculation process calculating the brake pad state based on sensor detection information during braking; and an information output process storing the brake pad state information in a storage and/or transmitting the brake pad state information to the outside. The brake pad state estimation device variably sets a processing frequency of at least one of the brake pad state calculation process and the information output process. The processing frequency when a vehicle speed is lower is lower than the processing frequency when the vehicle speed is higher, or the processing frequency when a brake pressure is lower is lower than the processing frequency when the brake pressure is higher.