Electric Braking Device Returning Mechanism Self-Diagnosis
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Solution Overview
Problem
Existing electric braking devices for vehicles face challenges in determining whether the returning mechanism, crucial for fail-safe operation, operates properly, often requiring additional structural components and complicating the system.
Innovation Solution
The electric braking device incorporates a controller, a rotation angle sensor, and a pressing force sensor to determine the operation of the returning mechanism by measuring changes in rotation angle and pressing force after electricity supply is stopped, eliminating the need for new components and ensuring reliable fail-safe function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional structural components are added to determine the operation of the returning mechanism, then the reliability of fail-safe function checking is improved, but the device complexity and weight increase
Solution Approach 1:
The patent makes existing sensors (rotation angle sensor and pressing force sensor) serve dual functions: their primary functions for braking control plus an additional function for determining returning mechanism operation. The rotation angle sensor detects both braking operation angle and returning mechanism status, while the pressing force sensor measures both braking force and returning force, eliminating the need for dedicated monitoring components.
Solution Approach 2:
The existing sensor system automatically provides information about returning mechanism operation without requiring separate monitoring systems. The controller analyzes data from sensors already present in the system to self-diagnose the status of the returning mechanism, making the system self-monitoring and reducing overall complexity.
2Reliability
If additional structural components are added to determine the operation of the returning mechanism, then the reliability of fail-safe function checking is improved, but the weight of the device increases
Solution Approach 1:
The patent makes existing sensors (rotation angle sensor and pressing force sensor) serve dual functions: their primary functions for braking control plus an additional function for determining returning mechanism operation. The rotation angle sensor detects both braking operation angle and returning mechanism status, while the pressing force sensor measures both braking force and returning force, eliminating the need for dedicated monitoring components.
3Device complexity
If existing sensors are used to determine returning mechanism operation, then the device complexity is reduced, but the measurement precision for returning mechanism monitoring may be insufficient
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors sensor data (rotation angle and pressing force) and compares it against expected values for proper returning mechanism operation. When deviations are detected, the system can identify returning mechanism failures and alert the driver, ensuring adequate monitoring precision through intelligent data analysis rather than additional hardware.
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 approach allows for reliable checking of the returning mechanism's operation without adding complexity or weight, ensuring proper fail-safe function by using existing sensors, thus simplifying the system and maintaining effective braking performance.
Implementation Method 1
an electric motor (MTR) that makes the piston (PSN) press against the friction member (MS)
Implementation Method 2
a returning mechanism (MDK) that applies a returning force (Frt) to the piston (PSN) in a direction away from the rotation member (KT)
Data Source
AI summary
Provided is an electric braking device wherein a friction member is pressed, via a piston driven by an electric motor, against a rotary member that rotates integrally with a vehicle wheel, thus generating a braking force on the vehicle wheel. The electric braking device is provided with: a controller for controlling the electric motor; a rotation angle sensor for detecting a rotation angle of the electric motor; and a return mechanism for applying a return force to a piston in a direction away from the rotary member. Furthermore, the controller executes a proper/improper determination to determine whether the return mechanism is operating properly on the basis of a change in the rotation angle after conduction of electricity to the electric motor is stopped.