Brake Regulation Torque Segmentation for Slope Retention
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Solution Overview
Problem
Existing automatic parking brake systems in motor vehicles often prematurely deactivate due to unintended increases in drive torque, leading to early vehicle roll-off on slopes and reduced comfort, as they fail to differentiate between driver-initiated and non-driver-initiated torque changes.
Innovation Solution
A brake regulating system with an electronic control unit that monitors and differentiates between driver-initiated and non-driver-initiated drive torque increases, adjusting the braking torque accordingly to prevent premature deactivation of the parking brake during standstill, using a flow chart method to determine when to suppress deactivation and maintain braking force based on predetermined torque thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the parking brake function is deactivated based on drive torque threshold, then the vehicle can start smoothly without brake retention, but the vehicle may roll prematurely on slopes if drive torque increases automatically
Solution Approach 1:
The patent segments the drive torque signal into different components by identifying and separating automatic drive torque increases (e.g., from engine idle control or transmission slip regulation) from driver-initiated torque increases. This segmentation allows the system to apply different deactivation logic: suppressing deactivation for automatic increases while allowing it for driver-initiated increases, thus resolving the contradiction between smooth starting and secure retention.
Solution Approach 2:
The system continuously monitors drive torque and provides feedback to the control unit, which adjusts the parking brake deactivation decision based on the source of torque increase. By implementing feedback control that distinguishes between different torque sources, the system maintains reliable vehicle retention while enabling smooth starts when appropriate, preventing premature roll-off on slopes.
2Reliability
If the parking brake function is maintained for longer duration, then vehicle retention security is improved, but vehicle starting comfort deteriorates due to excessive brake retention
Solution Approach 1:
The patent implements dynamic adjustment of the parking brake retention duration based on real-time drive torque analysis. Instead of using a fixed retention time, the system dynamically determines when to deactivate the brake by evaluating whether the torque increase is automatic (requiring longer retention) or driver-initiated (allowing earlier release). This dynamic approach optimizes both retention security and starting comfort.
Solution Approach 2:
The system changes the deactivation parameter (brake release timing) based on the detected torque source. When automatic drive torque increase is detected, the deactivation threshold is adjusted to maintain longer retention; when driver input is detected, the threshold allows earlier release. This parameter adaptation resolves the contradiction by optimizing retention duration for each specific operating condition.
Data Source
AI summary
A brake regulating system for motor vehicles is provided having an electronic control unit, by which an automatic parking brake function is activatable at a standstill of the motor vehicle, whose deactivation is performed as a function of the instantaneous drive torque, is implemented in such a way that in the event of activated parking brake function, a deactivation of the parking brake function may be suppressed if, on the basis of a function executed at a standstill of the motor vehicle, an automatic increase of the drive torque which does not result from a starting command of the driver is necessary.