Motor-Driven Parking Brake Anti-Lock Control Against Re-Acceleration
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Solution Overview
Problem
The motor-driven parking brake device's anti-lock control during braking results in prolonged brake release operations, potentially leading to re-acceleration of the vehicle due to creep torque on low-friction roads.
Innovation Solution
The system determines whether the acceleration during brake release exceeds the deceleration during brake operation and restricts anti-lock control when this condition is met, ensuring the vehicle does not re-accelerate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the EPB performs braking control with anti-lock control, then the braking effectiveness is improved, but the brake release operation time is prolonged
Solution Approach 1:
The control device monitors wheel speed and vehicle deceleration in real-time during anti-lock braking, using this feedback to detect re-acceleration conditions and adjust brake release timing accordingly, thereby optimizing the balance between braking effectiveness and release speed
Solution Approach 2:
The system dynamically adjusts the brake release operation duration based on detected vehicle conditions (re-acceleration detection), transitioning from a fixed-duration release to a condition-responsive variable duration release, resolving the contradiction between maintaining braking effectiveness and reducing release time
2Reliability
If the brake release operation time is prolonged, then the anti-lock control can prevent wheel lockup, but the vehicle may re-accelerate due to creep torque on low-friction roads
Solution Approach 1:
The control device continuously monitors vehicle deceleration and compares it against threshold values to detect re-acceleration events, using this feedback to identify when creep torque is causing unwanted vehicle movement during brake release, enabling targeted correction
Solution Approach 2:
The system detects re-acceleration conditions during the brake release operation and applies a counteracting brake force to prevent the harmful effect of creep torque-induced re-acceleration, effectively neutralizing the problem before it compromises vehicle control
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 effectively suppresses re-acceleration of the vehicle during anti-lock braking control, enhancing safety by maintaining control on low-friction surfaces.
Implementation Method 1
The EPB converts the rotation of a motor into a linear movement and transmits the movement to a brake pad to move the brake pad, and the brake pad is close to or away from a brake rotor
Implementation Method 2
the brake pad is close to or away from a brake rotor. This applies a brake to a vehicle
Data Source
AI summary
A brake control method includes: determining whether the acceleration amount in a brake release operation of a vehicle is equal to or larger than the deceleration amount in a brake operation of the vehicle when a parking brake device that is driven by a motor performs braking control with anti-lock control for alternately repeating the brake operation and the brake release operation while the vehicle is travelling; and restricting the anti-lock control from being performed when the acceleration amount is equal to or larger than the deceleration amount.