Braking Control Device Gradient Adaptation for Windup Prevention
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Solution Overview
Problem
The existing braking system control methods in motor vehicles face challenges in preventing windup and fully utilizing system dynamics, particularly when the braking system's dynamics are lower than the closed-loop dynamic controller's, leading to increased control errors and inefficient braking performance.
Innovation Solution
A method that determines the maximum achievable temporal gradient of the braking operation parameter and checks if it meets a freezing criterion, limiting control operation parameters to prevent windup and ensure the braking system operates within its maximum dynamics, thereby preventing excessive control errors and optimizing braking performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the closed-loop dynamic controller sets a high gradient for the braking operation parameter to achieve fast braking response, then the braking response speed is improved, but the braking system cannot track the gradient due to its lower dynamics, leading to windup and increased control errors
Solution Approach 1:
The patent applies dynamics by making the controller's demand gradient adaptive to the braking system's actual capabilities. The controller dynamically adjusts the demanded gradient based on the difference between the actual gradient and the desired gradient, allowing the system to operate at high speeds when capable while preventing windup when the system cannot keep up, thus resolving the contradiction between fast response and control accuracy
Solution Approach 2:
The patent uses feedback by continuously monitoring the actual gradient of the braking operation parameter and comparing it with the desired gradient. This feedback mechanism allows the controller to detect when the braking system cannot track the demanded gradient and adjust the control signal accordingly, preventing windup and maintaining control accuracy while still enabling fast braking response when the system is capable
2Reliability
If the controller limits the gradient of the braking operation parameter to match the braking system's dynamics, then windup is prevented and control accuracy is improved, but the braking response becomes slower
Solution Approach 1:
The controller dynamically adjusts the demanded gradient based on the braking system's actual performance rather than using a fixed limit. This allows the system to achieve the fastest possible response that the braking system can actually track, optimizing both response speed and control accuracy by adapting to the system's dynamic capabilities in real-time
Solution Approach 2:
The patent changes the control parameter (demanded gradient) dynamically based on the system's tracking performance. By adjusting the gradient parameter according to the difference between actual and desired gradients, the system optimizes the balance between response speed and control accuracy, preventing windup while maintaining the fastest possible braking response
Data Source
AI summary
The invention relates to a method for operating a control device for a braking system of a motor vehicle, wherein the control device receives a braking request from a driver assistance system and determines a target value of a braking operation parameter of the braking system and determines an ideal temporal process for the braking operation parameter, which gradually leads to the target value, complying with a predetermined jerk criterion, and a determines a control fault of an actual value of the braking operation parameter in relation to the ideal process and determines a request value for a controller of a brake pressure pump of the braking system from the control fault on the basis of a controller unit. According to the invention, the control device determines a maximum achievable temporal gradient of the braking operation parameter by means of the brake pressure pump and examines whether the gradient fulfills a freezing criterion and, in the case of the freezing criterion being fulfilled, limits at least one control operation parameter of the controller unit and/or a gradient of the brake request.