Electronic Parking Brake Release Control for Temperature-Driven Dragging
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Solution Overview
Problem
Existing brake systems with electric actuators generate noise and experience dragging due to inappropriate release control based on inconsistent brake temperatures, leading to unnecessary operation and increased power consumption.
Innovation Solution
Implement a brake system with a release control mechanism that adjusts the retracting amount of the drive member based on the brake temperature, including first, second, and third release controls, where the second and third controls are tailored to specific temperature conditions to minimize dragging and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the drive member is retracted by a fixed amount regardless of brake temperature, then the release control is simple, but dragging occurs when brake temperature increases due to thermal expansion of the friction engagement member
Solution Approach 1:
The release control mechanism dynamically adjusts the retracting amount of the drive member based on brake temperature conditions. When brake temperature is high, a first release control retracts the drive member by a first amount. When brake temperature is low, a second release control retracts the drive member by a second amount greater than the first amount, preventing dragging caused by thermal expansion at different temperature states.
Solution Approach 2:
The system changes the release control parameter (retracting amount of drive member) based on brake temperature. The brake temperature serves as a variable parameter that determines the magnitude of retraction, allowing the system to adapt to thermal expansion effects at different temperatures and suppress dragging effectively.
2Reliability
If the drive member is retracted by a large amount to prevent dragging, then dragging is suppressed, but the electric actuator operates unnecessarily longer generating noise and increasing power consumption
Solution Approach 1:
The electric actuator's operation duration is dynamically optimized by adjusting the retracting amount based on brake temperature. The system determines the minimum necessary retraction amount required to prevent dragging, avoiding excessive operation of the electric actuator and thereby reducing noise and power consumption while maintaining reliable dragging suppression.
Solution Approach 2:
The release control parameter (retracting amount) is changed according to brake temperature conditions. By setting the retracting amount to exactly what is needed to prevent dragging rather than using a fixed large amount, the system optimizes electric actuator operation time, reducing energy consumption and noise without compromising dragging suppression effectiveness.
3Reliability
If the drive member is retracted by a large amount to prevent dragging, then dragging is suppressed, but operation noise of the electric actuator increases
Solution Approach 1:
The system dynamically adjusts the electric actuator's retracting action based on brake temperature. By determining the precise retraction amount needed to prevent dragging rather than using excessive retraction, the system suppresses operation noise while maintaining effective dragging suppression across different temperature conditions.
4Reliability
If the drive member is retracted more when brake temperature is low, then dragging is prevented during subsequent traveling, but the release control becomes more complex
Solution Approach 1:
The release control mechanism uses brake temperature as a parameter to determine the retracting amount. When brake temperature is low, the system applies a second release control with a larger retracting amount to prevent dragging during subsequent traveling. This parameter-based approach provides a clear, implementable control strategy that balances complexity with effective dragging prevention.
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
The system effectively suppresses noise and reduces power consumption by optimizing the release control based on brake temperature, ensuring appropriate operation time and minimizing dragging.
Implementation Method 1
If the brake temperature increases, the friction engagement member may thermally expand, and dragging may be caused
Data Source
AI summary
A brake system having a brake control portion configured to control an electronic parking brake, wherein the brake control portion includes a release control portion configured to execute a release control in different modes based on a brake temperature that is a temperature of the electronic parking brake, the release control being for releasing the electronic parking brake.