Electromechanical Brake Booster Gradient Control
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Solution Overview
Problem
Electromechanical braking systems face issues with sudden changes in pedal force amplification due to large jumps in the characteristic curve, leading to hazardous underbraking or overbraking situations as drivers cannot react quickly enough, potentially resulting in uncontrollable driving states.
Innovation Solution
A method for controlling an electromechanical braking system that limits the change of the brake boosting force by determining and comparing the gradient of the target variable to a threshold value, using gradient limitation and smoothing filters to ensure controllable changes in the assistance force, thereby preventing sudden changes in the pedal force felt by the driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the brake boosting force is increased to provide sufficient braking assistance, then the braking effectiveness is improved, but sudden large changes in the boosting force cause hazardous underbraking or overbraking situations that drivers cannot react to quickly enough
Solution Approach 1:
The patent applies dynamics by making the brake boosting force adjustable and controllable in real-time based on driving conditions. The actuator motor dynamically modifies the pedal force amplification factor, allowing the system to adapt the boosting force to match current driving requirements while preventing sudden hazardous changes through controlled transition rates.
Solution Approach 2:
The patent changes the parameter of pedal force amplification factor dynamically. By modifying this parameter based on detected driving conditions and limiting the rate of change, the system achieves both sufficient braking assistance and safe, controllable transitions that drivers can react to appropriately.
2Productivity
If the characteristic curve of the brake boosting is adjusted to optimize braking performance, then the braking efficiency is improved, but large jumps in the characteristic curve lead to uncontrollable driving states
Solution Approach 1:
The system dynamically adjusts the characteristic curve of the brake boosting based on detected driving conditions, allowing optimization of braking efficiency for different scenarios. The dynamic nature enables smooth transitions between different operating points, maintaining driving controllability while improving overall braking efficiency.
Solution Approach 2:
The control unit continuously monitors driving conditions and adjusts the brake boosting characteristic curve accordingly. This feedback mechanism ensures that large jumps in the characteristic curve are prevented, maintaining driving controllability while optimizing braking efficiency for current conditions.
3Ease of operation
If the pedal force amplification is increased to reduce the physical effort required by the driver, then the ease of operation is improved, but sudden changes in amplification cause hazardous situations that compromise safety
Solution Approach 1:
The system provides high pedal force amplification to reduce driver effort while using dynamic control to limit the rate of change of amplification. This ensures that even though high amplification is available for ease of operation, sudden changes that would compromise safety are prevented through controlled transition rates.
Data Source
AI summary
A method for operating an electromechanical braking system for a transportation vehicle having a brake pedal, a brake master cylinder, and an electromechanical brake booster. The electromechanical brake booster includes an actuator motor for increasing or decreasing the pedal force on the brake master cylinder to boost or reduce the braking power accordingly. A change in the boosting force of the electromechanical brake booster is limited to avoid uncontrolled changes of the brake boosting.