Parking Brake Support Point Detection via Operating Parameter Curves
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Solution Overview
Problem
Existing vehicle brake systems face challenges in achieving precise control of parking brake units to generate desired brake forces and maintain appropriate clearance, leading to issues with actuating delays and residual grinding torques.
Innovation Solution
A method for operating a vehicle brake that involves moving the parking brake unit over two distinct movement ranges, detecting the course of operating parameters, and determining the support point where the brake force is varied, allowing for precise control and adjustment of brake forces and clearance without hydraulic pressure, using a controller and suitable detection devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a predetermined clearance is maintained between the brake disc and the friction lining, then residual grinding torques are avoided, but actuating delays occur
Solution Approach 1:
The control unit monitors the actual position of the parking brake unit during movement and compares it with the determined support point position. Based on this feedback, the control unit adjusts the movement to achieve precise positioning at the support point, enabling accurate clearance setting that avoids both residual grinding torques and excessive actuating delays
Solution Approach 2:
The system dynamically determines the support point position based on detected operating parameters (such as motor current, voltage, or speed) and adjusts the clearance parameter accordingly. This allows the clearance to be optimized for each specific operating condition, resolving the contradiction between avoiding grinding torques and minimizing actuating delays
2Measurement precision
If precise control instructions are provided to the parking brake unit, then desired brake forces and clearance are achieved, but system complexity increases
Solution Approach 1:
The control unit automatically determines the support point position by evaluating operating parameters detected during parking brake unit movement. The system self-adjusts the clearance and brake force control based on this determined position, eliminating the need for manual calibration or complex external control mechanisms while maintaining high precision
3Force
If the parking brake unit moves over a defined movement range, then brake force variation is achieved, but positioning accuracy at the support point is reduced
Solution Approach 1:
The system dynamically determines the support point position based on real-time detection of operating parameters during the movement of the parking brake unit. This dynamic adaptation allows the system to maintain high positioning accuracy at the support point even while the parking brake unit moves over a defined range to achieve the desired brake force variation
Data Source
AI summary
A method for operating a vehicle brake, wherein the vehicle brake comprises a service brake having an actuating piston, which can be moved into an actuation position in order to produce a braking force by the action of a hydraulic pressure, and wherein the vehicle brake also comprises a parking brake unit, which is designed to move over a first motion range without producing a braking force and is also designed to move over a second motion range, in which the parking brake unit is supported against the actuating piston and a braking force is thus changed, wherein the first and second motion ranges transition into each other at a support point, wherein the method is performed in the pressureless state or at a hydraulic pressure below a predefined threshold value and comprises the following steps: a) moving the parking brake unit from the first into the second motion range or vice versa; b) recording the curve of an operating parameter of the parking brake unit during step a); and c) determining the position of the support point on the basis of the curve of the operating parameter.