Electromechanical Brake Booster Motor Control for Pressure Spike Prevention
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Solution Overview
Problem
Electromechanical brake boosters in vehicle brake systems face challenges in preventing undesirably high pressures and pressure spikes in the master brake cylinder, particularly during anti-lock braking control procedures, which can lead to damage and mechanical stress, and existing systems do not react promptly to changes in hydraulic rigidity.
Innovation Solution
An electromechanical brake booster is used as a sensor system to rapidly identify load changes and adjust its operation to prevent excessive pressure, utilizing current strength and rotation angle data to estimate braking force and load torque, thereby limiting motor energy and preventing pressure spikes, and incorporating a control device to specify the highest desired rotational speed of the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electromechanical brake booster operates with high motor rotational speed to increase master brake cylinder pressure, then braking performance is improved, but pressure spikes and mechanical damage risk increase
Solution Approach 1:
The control device performs preliminary detection of load changes in the brake system before commanding high motor rotational speed. By detecting hydraulic rigidity changes and load torque variations in advance, the system prepares appropriate motor control parameters to prevent pressure spikes while maintaining braking performance
Solution Approach 2:
The system continuously monitors motor current, rotational speed, and load changes, using this feedback to dynamically adjust motor control commands. The control device compares actual operating conditions against safe operating limits and modifies motor rotational speed in real-time to prevent pressure spikes while maintaining effective braking
2Reliability
If conventional signal transmission methods are used to detect wheel inlet valve closing, then system reliability is maintained, but response time increases to at least 30 ms
Solution Approach 1:
The electromechanical brake booster's motor control system serves dual purposes: it both controls braking and simultaneously detects load changes. The motor current and rotational speed measurements, already taken for control purposes, are also used to detect hydraulic rigidity changes and wheel inlet valve closing, eliminating the need for separate detection systems and reducing response time
3Speed
If the electromechanical brake booster is used as a sensor system to detect load changes, then response speed is improved, but system complexity increases
Solution Approach 1:
The motor control system is designed to perform multiple functions simultaneously: it controls motor rotational speed for braking, monitors motor current for load detection, detects hydraulic rigidity changes, and prevents pressure spikes. This multi-functionality eliminates the need for separate sensor systems while improving detection speed
4Speed
If high motor rotational speed is commanded without load change detection, then braking responsiveness is improved, but mechanical load on the brake booster increases
Solution Approach 1:
The control device detects load changes and hydraulic rigidity variations before commanding high motor rotational speed. By identifying unfavorable operating conditions in advance, the system avoids commanding motor speeds that would create excessive mechanical loads, thereby protecting the brake booster while maintaining braking responsiveness when conditions are favorable
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 solution effectively reduces the risk of damage to brake system components, extends the service life of the electromechanical brake booster, and allows for more prompt reaction to changes in hydraulic rigidity, ensuring safe and efficient operation during anti-lock braking procedures.
Implementation Method 1
By means of an operation of a motor of the respective electromechanical brake booster, at least one adjustable piston of the master brake cylinder is possibly to be moved into the master brake cylinder
Data Source
AI summary
The disclosure relates to a control device and a corresponding method for operating an electromechanical brake booster of a brake system of a vehicle, comprising an electronics unit that defines a target variable with respect to a target rotational speed of a motor of the electromechanical brake booster, taking into account a brake input signal with respect to a braking request, and that sends at least one control signal to the motor. The electronics unit defines a maximum target variable with respect to a maximum target rotational speed of the motor, taking into account a current intensity of a motor current of the motor and a current angle of rotation of a rotor of the motor, and defines the target variable with respect to the target rotational speed of the motor of the electromechanical brake booster to be at the most equal to the defined maximum target variable.