Brake Device Motor Current Detection for Pad Rotor Position
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Solution Overview
Problem
Existing brake devices lack a mechanism to maintain brake pads and rotors in a desired positional relationship, leading to inaccurate detection of contact and separation, which can result in improper braking force application and release.
Innovation Solution
A brake device with a detection unit that monitors the current changes in an electric motor to detect contact or separation between brake pads and rotors, inhibiting the execution of a second request until the desired positional relationship is confirmed, allowing for precise control without the need for additional position sensors or thrust-force sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a brake device uses an electric motor to move the piston for applying braking force, then the braking force application is improved, but the positional relationship between pads and rotor cannot be maintained accurately
Solution Approach 1:
The patent replaces mechanical position sensing mechanisms with an electrical detection method. The detection unit monitors current changes in the electric motor during operation to infer the contact or separation state between pads and rotor. This substitution eliminates the need for additional mechanical sensors while maintaining detection accuracy.
Solution Approach 2:
The execution unit receives real-time feedback from the detection unit about the contact or separation state between pads and rotor. Based on this feedback, the execution unit adjusts the control of the electric motor to maintain the desired positional relationship. The system continuously monitors current changes and modifies motor operation accordingly to prevent improper braking force application.
2Speed
If the brake device executes multiple braking requests continuously, then the braking response speed is improved, but the positional relationship between pads and rotor becomes unstable
Solution Approach 1:
The detection unit periodically monitors the current changes of the electric motor during braking operations to detect contact or separation states. This periodic detection allows the system to maintain stability by adjusting motor operation at appropriate intervals, preventing continuous unstable adjustments while still responding quickly to braking requests.
Solution Approach 2:
The execution unit preemptively inhibits the execution of a second braking request when contact or separation is detected during the first request execution. This preliminary action prevents unstable positional relationships from developing by stopping motor operation at critical moments, ensuring the pads and rotor maintain their desired positional relationship before accepting new commands.
3Measurement precision
If additional position sensors or thrust-force sensors are added to maintain positional relationship, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The electric motor serves multiple functions: it provides the driving force for piston movement to apply braking force, and simultaneously acts as a sensor through its current characteristics. By monitoring the current changes during motor operation, the system detects contact or separation states without requiring separate sensing components. This multi-functionality reduces device complexity while maintaining detection precision.
Solution Approach 2:
The electric motor self-provides detection capability through its inherent current characteristics during operation. The detection unit exploits the natural current changes that occur when the motor drives the piston into contact with or separates from the pads. This self-service approach eliminates the need for external sensors, reducing system complexity while achieving accurate positional relationship detection.
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 solution ensures accurate maintenance of the brake pads and rotors in a desired positional relationship, enhancing the precision of braking force application and release, and preventing shifting or misalignment, thus improving braking performance.
Implementation Method 1
an electric motor configured to move the piston when a current is fed to the electric motor
Implementation Method 2
a detection unit configured to detect contact or separation between the pad and the rotor
Data Source
AI summary
Provided is a brake device capable of maintaining pads and a rotor in a desired positional relationship. When receiving a release request within a time period from start of execution of an application request to detection of contact between brake pad and a disc rotor, a parking brake control device inhibits execution of the release request, and executes the release request after detection of the contact between the brake pad and the disc rotor. Further, when receiving the application request within a time period from start of execution of the release request to detection of separation between the brake pad and the disc rotor, the parking brake control device inhibits execution of the application request, and executes the application request after detection of the separation between the brake pad and the disc rotor.