Electromechanical Brake Braking Force Determination
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Solution Overview
Problem
Existing methods for determining braking force in electromechanical brake devices struggle to accurately measure braking force when the brake motor is actuated and the brake lining is already in contact with the brake disc, as current peaks from the switch-on current interfere with the motor current, making it difficult to evaluate the prevailing motor current directly.
Innovation Solution
A method that filters out the switch-on current peaks from the prevailing motor current to isolate the load current, which is then used to calculate the braking force by determining the motor time constant and recursive calculation of the switch-on current, allowing for precise determination of the braking force even when the brake lining is already in contact with the brake disc.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the brake motor is actuated to move the brake piston against the brake disc, then braking force is generated, but current peaks from switch-on current interfere with motor current measurement, making it difficult to accurately determine braking force
Solution Approach 1:
The motor current is segmented into two distinct components: switch-on current and load current. By calculating the switch-on current separately using motor constants and recursive algorithms, the method isolates the load current that truly reflects braking force, eliminating measurement interference.
Solution Approach 2:
The method performs preliminary calculation of the switch-on current before it interferes with measurement. By using previously determined motor constants and recursive algorithms to predict the switch-on current profile, the interference is accounted for in advance, allowing accurate extraction of load current.
2Productivity
If the brake lining is already in contact with the brake disc when the brake motor is switched on, then the brake system is ready for immediate braking, but the switch-on current peak overlaps with the force buildup current, preventing direct evaluation of motor current for braking force determination
Solution Approach 1:
The method uses feedback through recursive calculation, where previously determined motor constants and switch-on current profiles inform the calculation of current switch-on current. This continuous feedback loop allows real-time differentiation between switch-on current and load current, enabling accurate braking force determination during rapid response conditions.
Solution Approach 2:
The method replaces direct mechanical current measurement with an electrical calculation approach. By using electrical parameters (motor constants, resistance, recursive algorithms) to calculate and separate current components, the system substitutes complex mechanical measurement with cleaner electrical computation.
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 method enables more accurate determination of braking force, allowing for precise control of the electromechanical brake device, enabling additional braking force generation or reduction, and ensuring system functionality, such as anti-lock braking, by accurately calculating the load current and motor torque.
Implementation Method 1
an electric brake motor that influences a brake piston that is a carrier of a brake lining against a brake disc in order to generate braking force
Implementation Method 2
a brake piston that is a carrier of a brake lining against a brake disc in order to generate braking force
Data Source
AI summary
In the case of a method for determining the braking force in an electromechanical brake device having a brake motor, the braking force is determined from a prevailing load current that is determined from the difference between the measured motor current and the calculated switch-on current.