Vehicle Brake Factor Estimation for Accurate Torque Control
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Solution Overview
Problem
Existing brake control systems, such as ABS and ESP, rely on imprecise calculations of braking torque due to the assumption of a constant braking factor, which is influenced by environmental conditions and vehicle characteristics, leading to inaccurate estimations.
Innovation Solution
A method and equipment for estimating a braking factor using the equation kbrk=a+b*vveh+c*pbrk+d*Tbrk+f*pbrk2, where kbrk is the braking factor, a, b, c, d, and f are model parameters, and vveh, pbrk, and Tbrk are vehicle velocity, braking pressure, and brake temperature, respectively, allowing adaptation to varying braking conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the braking factor is assumed as a constant, then the calculation is simple, but the braking force calculation is imprecise
Solution Approach 1:
The braking factor is transformed from a static constant to a dynamic variable that changes with braking pressure and brake temperature. The system continuously updates the braking factor based on real-time sensor measurements of pressure and temperature, allowing the calculation to adapt to varying operating conditions while maintaining computational feasibility through a defined mathematical relationship.
Solution Approach 2:
The braking factor is expressed as a function of two key parameters: braking pressure and brake temperature. By incorporating these parameters into the braking factor calculation, the system captures the physical reality that braking effectiveness changes with pressure application and thermal conditions, thereby improving precision without excessive complexity.
2Measurement precision
If the braking factor is adapted to varying braking conditions, then the braking force calculation becomes more accurate, but the system complexity increases
Solution Approach 1:
The system implements feedback by continuously measuring brake temperature and braking pressure, then using these measurements to update the braking factor in real-time. This closed-loop approach ensures the braking force calculation remains accurate under varying conditions while keeping the system architecture straightforward through the use of existing sensors and a clear computational relationship.
Solution Approach 2:
The braking factor serves as an intermediary variable that mediates between the measurable quantities (pressure, temperature) and the desired output (braking force). By introducing this intermediate calculation step with a well-defined mathematical relationship, the system achieves high precision without requiring direct complex measurement of braking force itself.
3Measurement precision
If more braking parameters are considered in the model, then the estimation accuracy improves, but the model complexity increases
Solution Approach 1:
The model focuses on capturing the locally most significant effects by selecting braking pressure and brake temperature as the key parameters. These two parameters represent the dominant local influences on braking factor variation, allowing the model to achieve high accuracy by concentrating on the most critical variables rather than attempting to model all possible影响因素.
Solution Approach 2:
The model incorporates slightly more parameters than the absolute minimum by including both pressure and temperature effects, along with their interaction terms. This partial expansion beyond a simple constant model provides sufficient accuracy for practical applications while avoiding the excessive complexity that would result from including all conceivable parameters.
Data Source
AI summary
Method and equipment for estimating a braking factor for a braking system for a vehicle. The method includes estimating a braking factor (kbrk) for a braking system for a vehicle, in which the braking factor (kbrk) is by applying the following equation: kbrk=a+b*vveh+c*pbrk+d*Tbrk+f*pbrk2, in which a, b, c, d and f are model parameters, vveh is a velocity of the vehicle, pbrk is a braking pressure, and Tbrk is a brake temperature.