Electric Parking Brake Current Threshold Control for Thrust Stability
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Solution Overview
Problem
Conventional electric parking brake systems experience variations in thrust force when holding a braking force, leading to inefficiencies and increased size and cost.
Innovation Solution
An electric parking brake apparatus with a control system that adjusts the target current threshold value of the electric motor based on rotational acceleration, ensuring accurate stopping and reducing maximum thrust force by correcting torque and current values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric motor drives the electric mechanism to press the braking member against the braking target member and hold the braking force, then the braking force is maintained, but the thrust force generated by the electric motor varies during the holding process
Solution Approach 1:
The control apparatus continuously monitors the current value of the electric motor and compares it with the target current threshold value. Based on this feedback, the control apparatus adjusts the driving state of the electric motor to maintain the braking force while suppressing thrust force variations. The feedback loop ensures that the system responds to changes in real-time, correcting deviations from the desired braking force.
Solution Approach 2:
The control apparatus changes the target current threshold value according to the rotational acceleration of the electric motor. By dynamically adjusting this parameter based on the motor's rotational state, the system compensates for variations in thrust force generation, ensuring stable braking force holding while adapting to changing operational conditions.
2Reliability
If a conventional electric motor system is used to hold braking force, then the braking function is achieved, but the maximum thrust force required is high, leading to larger and more expensive components
Solution Approach 1:
By dynamically adjusting the target current threshold value based on rotational acceleration, the system optimizes the current profile of the electric motor during braking force holding. This parameter adaptation allows the motor to generate the necessary braking force with reduced peak current requirements, thereby lowering the maximum thrust force and enabling smaller, more cost-effective component design.
Solution Approach 2:
The control apparatus implements dynamic control by continuously adjusting the target current threshold according to the real-time rotational acceleration of the motor. This dynamic approach replaces static current thresholds with adaptive values that match the actual operational demands, reducing unnecessary thrust force peaks and optimizing the overall system performance.
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 suppresses variations in thrust force, allowing for precise control of the braking force, reducing the maximum thrust force, and achieving size and cost reductions in the brake mechanism.
Implementation Method 1
an electric motor configured to drive an electric mechanism configured to press a braking member against a braking target member
Data Source
AI summary
A parking brake control apparatus (24) stops driving of an electric motor (7A) when a current value of the electric motor (7A) reaches a target current threshold value, when driving the electric motor (7A) to press brake pads (6C) against a disk rotor (4) and hold a braking force. The target current threshold value is a current value for stopping the driving of the electric motor (7A). The parking brake control apparatus (24) changes the target current threshold value according to a rotational acceleration of the electric motor (7A).