Electronic Brake System Center of Gravity Calculation
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Solution Overview
Problem
Current electronic braking systems in commercial vehicles rely on estimated center of gravity height, leading to insufficient stability control and safety margins, as the height is not calculated precisely, affecting anti-lock braking and anti-slip functions.
Innovation Solution
The method iteratively calculates the center of gravity height using a reference signal derived from sensors, including lateral acceleration and wheel speed differences, and corrects for tire deformation and temperature changes, allowing for precise stability control and improved safety functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the center of gravity height is estimated as a fixed value, then the system complexity is reduced, but the stability control precision deteriorates
Solution Approach 1:
The system uses feedback from wheel speed sensors and lateral acceleration sensors to continuously monitor vehicle behavior and iteratively calculate the center of gravity height. The calculated values are fed back to adjust stability control parameters in real-time, resolving the contradiction by maintaining precision without requiring complex fixed-value estimation systems.
Solution Approach 2:
The electronic braking system uses its own existing sensors (wheel speed sensors and lateral acceleration sensors) to calculate the center of gravity height, rather than requiring external or additional complex measurement systems. This self-service approach maintains system simplicity while achieving precise stability control through iterative calculation.
2Measurement precision
If the center of gravity height is calculated iteratively using sensor data, then the stability control precision is improved, but the computational complexity increases
Solution Approach 1:
The iterative calculation of center of gravity height is performed continuously using ongoing sensor data from wheel speed and lateral acceleration measurements. This continuous calculation ensures precise stability control without requiring complex batch processing or intermittent measurements, maintaining computational efficiency while achieving high precision.
Solution Approach 2:
The existing wheel speed sensors and lateral acceleration sensors, originally designed for other braking functions, are also used for calculating center of gravity height. This multi-functional use of existing sensors reduces the need for additional specialized equipment while achieving precise iterative calculation.
3Measurement precision
If safety margins are reduced by using calculated center of gravity height, then the stability control accuracy is improved, but the system reliability at risk
Solution Approach 1:
The system dynamically adjusts stability control parameters based on the calculated center of gravity height rather than using fixed conservative margins. The control system adapts in real-time to actual vehicle conditions, improving accuracy while maintaining reliability through continuous monitoring and adjustment based on sensor feedback.
Data Source
Figure 1
AI summary
A method for operating an electronic brake system in a vehicle having at least two tires on an axle, wherein the vehicle has a center of gravity (SP) with a height (hSP), is disclosed. According to the method, the height (hSP) of the center of gravity (SP) is calculated and used as a parameter by the electronic brake system. An electronic control unit, an electronic brake system, and a vehicle including the same for carrying out the method are also disclosed.