Electromechanical Brake Booster Force Control
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Solution Overview
Problem
Existing electromechanical brake boosters in vehicle braking systems face challenges in controlling pressure peaks and mechanical stresses, leading to potential damage and reduced service life, especially during antilock regulation operations, due to their high gearing ratio and friction, which results in delayed reaction times to changes in load.
Innovation Solution
A control apparatus that utilizes the electromechanical brake booster as a sensor system to monitor and adjust motor force based on the force difference between target and actual motor forces, preventing excessive pressure by controlling the motor's rotation speed and estimating actual forces through current intensity and rotation angle, allowing quicker reaction to load changes and reducing the risk of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the electromechanical brake booster uses high gearing ratio and high gearing friction to achieve high holding capability, then the brake application force is increased, but the reaction time to load changes is delayed
Solution Approach 1:
The control device continuously monitors the actual motor force through current intensity and rotation angle sensors, compares it with the target motor force, and adjusts the motor control in real-time based on the force difference. This feedback mechanism enables the system to react promptly to load changes despite the high gearing ratio, resolving the contradiction between force amplification and reaction time delay
Solution Approach 2:
The system dynamically adjusts the motor rotation speed based on the detected force difference between target and actual motor forces. By continuously adapting the motor operation to current load conditions, the system maintains high holding capability while improving responsiveness to load changes, overcoming the static limitations of high gearing friction
2Speed
If the motor rotation speed is increased to improve response time, then the reaction to load changes is faster, but excessive pressure peaks occur in the brake master cylinder
Solution Approach 1:
The control device uses feedback from force sensors to monitor the actual motor force and compares it with the target force. Based on the force difference, the control device adjusts the motor rotation speed to achieve the desired brake application force without exceeding pressure limits, thereby preventing pressure peaks while maintaining fast response
Solution Approach 2:
The system changes the motor rotation speed parameter dynamically based on the detected force difference. By adjusting this parameter in response to actual load conditions, the system achieves fast response times while controlling the brake master cylinder pressure within safe limits, avoiding excessive pressure peaks
3Measurement precision
If the electromechanical brake booster is used as a sensor system to quickly detect load changes, then the detection speed is improved, but the complexity of the control system increases
Solution Approach 1:
The electromechanical brake booster serves dual functions: it acts as both the actuator for brake application and as a sensor system for detecting load changes. By utilizing the existing motor's current intensity and rotation angle measurements for force estimation, the system achieves fast load detection without adding separate sensing components, thereby reducing overall system complexity
Solution Approach 2:
The system uses its own operational parameters (motor current intensity and rotation angle) to estimate the actual motor force and detect load changes. This self-service approach allows the brake booster to function as its own sensor system, improving detection speed while avoiding the need for additional external sensing equipment and complex control architecture
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
The solution effectively prevents pressure peaks and mechanical stresses, enhancing the service life of brake system components by enabling prompt recognition and response to load changes, reducing the risk of damage during antilock regulation and lowering repair costs.
Implementation Method 1
by operation of a motor of the respective electromechanical brake booster, at least one displaceable piston of the brake master cylinder is to be displaceable into the brake master cylinder
Implementation Method 2
estimating a present actual motor force of the motor or a present actual brake application force into the downstream brake master cylinder
Data Source
AI summary
A control apparatus/method for operating an electromechanical brake booster of a vehicle braking system, including: applying control to an electromechanical brake booster motor in consideration at least of a braking definition signal regarding a braking input of a driver and/or automatic speed control system of the vehicle (ACC); specifying, in consideration at least of the braking definition signal, a target motor force of the electromechanical brake booster motor or a target brake application force of the electromechanical brake booster into a brake master cylinder, downstream from the electromechanical brake booster, of the braking system; and applying control to the electromechanical brake booster motor in consideration of a force difference between the specified target motor force and an estimated/measured actual motor force of the motor, or between the specified target brake application force and an estimated/measured actual brake application force of the electromechanical brake booster into the downstream brake master cylinder.