Electromechanical Brake Control Using Wheel Speed Instead of Force Sensors
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Solution Overview
Problem
Existing braking systems for motor vehicles face challenges in accurately measuring braking force due to temperature and wear dependencies, and the corresponding sensors are costly.
Innovation Solution
A braking system with electromechanical brake actuators and a vehicle motion control system that uses wheel rotational speed sensors to determine desired wheel rotational speeds, controlling the actuators to achieve safe braking without requiring sensors for braking force detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors for detecting braking force are used, then braking force measurement accuracy is improved, but system cost increases
Solution Approach 1:
The patent extracts the braking force measurement function from dedicated sensors and relocates it to the vehicle motion control system's existing computational resources. The control system calculates braking force indirectly using wheel rotational speed data and vehicle dynamics models, eliminating the need for separate braking force sensors and reducing system cost while maintaining measurement capability.
Solution Approach 2:
The patent introduces wheel rotational speed as an intermediary parameter to infer braking force. Instead of directly measuring braking force with expensive sensors, the system uses wheel speed changes as a mediator to calculate the applied braking force through physical relationships, providing accurate measurement information without direct force sensors.
2Manufacturing precision
If braking force sensors are installed, then braking control precision is improved, but temperature and wear dependencies increase
Solution Approach 1:
The patent replaces mechanical braking force sensors with a computational model-based approach. The vehicle motion control system uses mathematical models of vehicle dynamics combined with wheel rotational speed measurements to calculate braking force, substituting physical sensing elements with electronic computation that is not subject to temperature and wear effects.
Solution Approach 2:
The system uses its own existing sensors (wheel rotational speed sensors) and computational resources to determine braking force, rather than relying on separate dedicated force sensors. The vehicle motion control system self-calculates the braking force parameter using available data and physical models, making the system self-sufficient and avoiding additional vulnerable components.
3Device complexity
If wheel rotational speed control is used instead of braking force control, then sensor cost is reduced, but measurement precision for braking force is lost
Solution Approach 1:
The patent uses wheel rotational speed as an intermediary measurement that allows the system to infer braking force indirectly. The vehicle motion control system processes wheel speed data through vehicle dynamics models to obtain accurate braking force information, using speed as a mediator that connects measurable quantities to the desired force parameter without requiring direct force sensors.
Solution Approach 2:
The system implements feedback control where the vehicle motion control system continuously monitors wheel rotational speeds and adjusts brake actuator commands based on the difference between actual and desired wheel speeds. This feedback loop enables accurate braking force control through computational processing of speed measurements, replacing the need for direct force measurement sensors.
Data Source
AI summary
A method for braking a motor vehicle including a vehicle motion control system and a braking system with electromechanical brake actuators, wherein each wheel of the motor vehicle is assigned one of the electromechanical brake actuators, comprises the vehicle motion control system receiving a driving direction input comprising a deceleration input, an actual vehicle speed, and an actual wheel rotational speed for each wheel of the motor vehicle, the vehicle motion control system determining a reference driving line for the motor vehicle on the basis of the received driving direction input and the received actual vehicle speed, the vehicle motion control system determining a desired wheel rotational speed which is required to comply with the reference driving line and to implement the deceleration input, and the vehicle motion control system activating the brake actuators, taking into consideration the respectively received actual wheel rotational speed, in such a way that the actual wheel rotational speed is adjusted to the desired wheel rotational speed.