Braking Intention Detection via Output Rod Position
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Solution Overview
Problem
Conventional braking intention detection systems face significant deviations between input rod and output rod travel due to mass inertias and boosting characteristics of electromechanical brake boosters, requiring complex case-by-case distinctions and limiting accuracy.
Innovation Solution
The system detects braking intention by measuring the position and travel of the output rod, booster body, timing case, motor components, and reaction disk using sensors, eliminating the need for input rod travel measurements and allowing for system observation of driver and automatic vehicle control system intentions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If braking intention detection is based on input rod travel, then the system can detect driver input, but considerable deviations occur between input rod position and output rod position due to mass inertias and boosting characteristics
Solution Approach 1:
The patent extracts the measurement from the input rod and relocates it to the output rod, which directly reflects the braking force applied to the wheel. By measuring output rod travel instead of input rod travel, the system eliminates the complex relationship caused by booster characteristics and mass inertias, achieving accurate braking intention detection without requiring case-by-case distinctions.
Solution Approach 2:
The output rod serves as an intermediary measurement point that directly correlates with the braking force applied to the wheel. By using the output rod position as the measurement intermediary, the system avoids the complex transmission characteristics between the input rod and the braking mechanism, providing a direct and accurate representation of braking intention.
2Reliability
If the system uses input rod position for braking detection, then driver input can be monitored, but the boosting characteristic causes input rod to move more quickly or slowly than output rod
Solution Approach 1:
The measurement point is extracted from the input rod and placed directly on the output rod, eliminating the time delay caused by the boosting characteristic. The output rod position directly reflects the current braking force being applied, providing immediate and reliable braking intention detection without the lag or lead effects caused by the booster's mass inertias and boosting characteristics.
3Measurement precision
If braking intention detection requires case-by-case distinctions for different operating conditions, then accuracy can be maintained, but the electronics complexity and cost increase
Solution Approach 1:
The patent simplifies the measurement system by extracting the measurement from the input rod and placing it on the output rod. This single measurement point directly reflects braking intention across all operating conditions, eliminating the need for complex case-by-case evaluation logic in the electronics, thereby reducing manufacturing complexity and cost while maintaining high accuracy.
Solution Approach 2:
The output rod position measurement serves as a universal indicator for braking intention across all operating conditions, including different braking forces, vehicle speeds, and booster states. This single measurement approach replaces multiple specialized measurements and conditional logic, achieving universal applicability without increasing electronics complexity.
Data Source
AI summary
A method for detecting a braking intention in a vehicle includes: establishing at least one setpoint braking power for the braking intention specified by a driver and/or an automatic vehicle control system; and taking at least one ascertained sensor variable into consideration. The sensor variable includes: a variable regarding a position and/or an adjustment travel of an output rod of the braking system, a position and/or an adjustment travel of a booster body of the braking system, a position and/or an adjustment travel of a timing case of the braking system, a position, an adjustment travel and/or a rotation angle of a component of a motor of an electromechanical brake booster, a position, an adjustment travel and/or a rotation angle of a component of a thread of the brake booster, and/or a shape and/or a deformation of a reaction disk of the braking system.