Brake Actuator Position Control Without Wheel Force Sensors
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Solution Overview
Problem
Existing brake systems for motor vehicles require complex force sensors to determine accurate braking positions, which can be costly and prone to inaccuracies, especially in situations where vehicle speed data is unavailable or unreliable.
Innovation Solution
A method for generating a target value for an actuator position using wheel speed data from another wheel, incorporating a slip scaling factor, allows for the correction of a starting value to determine the target position without the need for force sensors, by calculating a correction value based on wheel speed differences and vehicle speed, if available, and adjusting the actuator position accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If force sensors are used to determine accurate braking positions, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses wheel speed data from other wheels as an intermediary to infer the braking position of the target wheel. Instead of directly measuring the braking position with force sensors, the system uses wheel speed differences and slip scaling factors as mediators to calculate the target actuator position, thereby avoiding direct force measurement while maintaining accuracy
Solution Approach 2:
The patent copies wheel speed data from other wheels (where force sensors may already be present or where measurement is easier) to determine the braking position of the target wheel. By replicating the measurement approach across multiple wheels and using relative comparisons, the system achieves accurate braking position determination without requiring force sensors on every wheel
2Measurement precision
If force sensors are used to determine accurate braking positions, then measurement precision is improved, but cost increases
Solution Approach 1:
The patent replaces expensive force sensors with cheaper wheel speed sensors and computational algorithms. By using readily available wheel speed data and processing it through mathematical relationships (slip scaling factors, correction values), the system achieves comparable or superior accuracy at lower cost
Solution Approach 2:
The patent uses wheel speed data as a cost-effective intermediary to infer braking position information that would otherwise require expensive direct force measurement. This intermediary approach leverages existing sensor data and simple calculations to replace costly hardware
3Device complexity
If wheel speed data from other wheels is used to determine target position, then device complexity is reduced, but measurement precision may worsen
Solution Approach 1:
The patent implements feedback mechanisms where wheel speed data from other wheels is continuously monitored and used to adjust the target actuator position calculation. The system uses slip scaling factors and correction values that are dynamically adjusted based on observed wheel speed differences, ensuring accurate braking position determination despite using indirect measurements
Solution Approach 2:
The patent changes the measurement parameters from direct force measurement to wheel speed measurement. By transforming the problem into the domain of wheel speed data and using mathematical relationships (slip scaling, correction values), the system maintains measurement precision while simplifying the hardware requirements
Data Source
AI summary
A method for generating a target value of a position of an actuator of a brake of a wheel of a motor vehicle is disclosed. Values of another wheel are used and as a result a correction value which corrects a starting value is determined. As a result, a force sensor system on the wheel can be omitted. Further an associated method for controlling an actuator of a brake of a wheel of a motor vehicle and an associated control device are disclosed.