Automated Locking Brake Shut-off Control for Consistent Deceleration
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Solution Overview
Problem
Current vehicle systems with electromechanical auxiliary braking mechanisms lack precision in activating and adapting to changing conditions such as load state, brake lining coefficient of friction, and temperature, leading to inconsistent vehicle deceleration during emergency braking.
Innovation Solution
A method for dynamically calculating the shut-off time of the locking brake's activation, taking into account predicted values and external influencing factors, to ensure consistent vehicle deceleration by determining the optimal shut-off point based on remaining time, overtravel time, and deceleration progress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the locking brake activation is maintained until the target motor current value is achieved, then the braking force reaches the target specification, but the vehicle deceleration becomes inconsistent when external factors such as load state, brake lining coefficient of friction, or temperature change
Solution Approach 1:
The system calculates a predicted value of the locking brake process in advance, considering the overtravel time required after activation shut-off. This preliminary calculation allows the system to determine the optimal shut-off point before the actual target is reached, compensating for external factors that will affect the final deceleration outcome.
Solution Approach 2:
The control system dynamically adjusts the activation shut-off point based on real-time conditions. Instead of using a fixed target current value, the system continuously calculates the predicted braking process and determines the optimal shut-off moment, making the system adaptable to changing external factors such as load state, friction coefficient, and temperature.
2Ease of operation
If the activation is shut off based on current motor current measurement, then the control is simple and responsive, but the vehicle deceleration is imprecise due to system overtravel and external influencing factors
Solution Approach 1:
The system performs preliminary calculation of the predicted locking brake process and overtravel time before shutting off activation. This advance calculation allows precise deceleration control without requiring complex real-time adjustments during the braking process, maintaining operational simplicity while improving precision.
Solution Approach 2:
The system uses feedback from the predicted braking process calculation to determine the optimal shut-off point. By considering the overtravel time and predicted deceleration curve, the system adjusts the activation shut-off timing to achieve precise vehicle deceleration while keeping the control logic relatively simple.
3Speed
If the activation is shut off immediately when the target value is reached, then the response time is short, but the system cannot compensate for overtravel and external factors affecting deceleration
Solution Approach 1:
The system calculates the predicted braking process and determines the optimal shut-off point in advance, considering the overtravel time. This allows the system to shut off activation slightly before the target current is reached, ensuring consistent deceleration without sacrificing response speed, as the calculation is performed continuously and rapidly.
4Stability of the object's composition
If characteristic diagrams with fixed force levels are used, then the control strategy is simple and stable, but the system cannot adapt to modified framework conditions such as increased vehicle load or reduced brake lining friction
Solution Approach 1:
The system replaces fixed characteristic diagrams with a dynamic calculation approach. Instead of relying on pre-defined force levels that cannot adapt to changing conditions, the system continuously calculates the predicted locking brake process and determines the optimal shut-off point based on current external factors such as load state, friction coefficient, and temperature, while maintaining control stability through systematic calculation methods.
Data Source
AI summary
A method for operating an automated locking brake in a motor vehicle includes setting a defined deceleration of the vehicle with the locking brake during a locking brake process, shutting-off activation of the locking brake when a shut-off condition has been satisfied, and taking into account at least one predicted value of the locking brake process in the shut-off condition.