Parking Brake Control for Autonomous Maneuvers Under Brake Heating
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Solution Overview
Problem
During fully autonomous driving maneuvers, such as parking, the permanent activation of a vehicle's parking brake can lead to increased temperatures in brake components, causing an unintentional increase in braking effect, which impedes the vehicle's movement due to varying brake torque and friction, necessitating a method to detect and mitigate this effect.
Innovation Solution
A method that detects and evaluates operating parameters like drive torque and wheel rotation speed differences to determine unintentional increases in braking effect, adjusting the braking force accordingly, with thresholds correlated to longitudinal inclination and steering angle to ensure reliable continuation of the driving maneuver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the parking brake is permanently activated during autonomous driving maneuvers, then the vehicle can be held securely and reliably, but the braking effect unintentionally increases due to temperature variations in brake components, impeding vehicle movement
Solution Approach 1:
The control device continuously monitors operating parameters (wheel rotation speeds, drive torque, vehicle speed) and adjusts the braking effect in real-time based on detected deviations. When an unintentional increase in braking effect is detected through parameter evaluation, the control device compensates by reducing the braking force, creating a closed-loop feedback system that maintains reliable vehicle holding while preventing movement impairment
Solution Approach 2:
The system dynamically changes the braking effect parameter based on detected temperature variations and operating conditions. By monitoring operating parameters and evaluating deviations from expected values, the control device adjusts the braking force magnitude to compensate for thermal effects on brake components, transforming the braking system from static to adaptive
2Reliability
If the brake installation components heat up during prolonged driving maneuvers, then the braking effect is amplified due to varying friction, but this impedes the implementation of the driving maneuver
Solution Approach 1:
The control device uses feedback from operating parameters (wheel rotation speeds, drive torque requirements, vehicle speed) to detect when heating causes braking effect amplification. When the system detects that the drive torque exceeds expected values or wheel speed differences indicate increased braking resistance, it reduces the braking force to maintain driving maneuver productivity
Solution Approach 2:
The system uses the vehicle's own operating parameters (wheel speeds, drive torque, speed differences) as indicators of brake heating effects, allowing the braking system to self-diagnose and self-adjust without external intervention. The control device automatically compensates for thermal effects by evaluating real-time operational data
3Productivity
If the drive operates counter to the braking effect to maintain vehicle movement, then the driving maneuver can continue, but the drive torque requirement increases significantly
Solution Approach 1:
The control device applies a counteracting action by reducing the braking effect in response to detected unintentional increases. When the system identifies that the drive is working excessively hard against brake resistance (through parameter evaluation), it reduces the braking force to balance the forces, allowing the drive to operate more efficiently and maintain vehicle movement with reduced power demand
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the reliable continuation of autonomous driving maneuvers by reducing unintended braking effects, maintaining vehicle movement despite component heating and varying friction conditions, thus enhancing the robustness and reliability of fully autonomous driving.
Implementation Method 1
the temperature can in particular increase by virtue of the prevailing friction
Data Source
AI summary
The disclosure relates to a driver assistance method, in which a vehicle performs a driving manoeuvre automatically, and a braking device, in particular a parking brake, is at least partially actuated during the performance of the driving manoeuvre so that a braking action is constantly exerted on the wheels of at least one axle so that a drive of the vehicle operates counter to the braking action of the braking device in order to move the vehicle. According to the disclosure, during the driving manoeuvre at least one operating parameter which is related to an undesired increase in the braking action exerted on at least one wheel is detected and evaluated, and a braking action on at least one wheel is reduced in accordance with the result of said evaluation.