Dynamic Brake Holding Threshold Adjustment
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Solution Overview
Problem
The existing vehicle brake holding systems face challenges in setting an optimal activating braking pressure threshold value that balances maintaining the vehicle at a standstill with minimizing driver effort and avoiding unwanted movements or noise, especially on inclined roads and with automatic transmissions.
Innovation Solution
A method to automatically adjust the activating braking pressure threshold value by monitoring vehicle movements and braking pressure during a standstill, incrementing and decrementing a movement counter to adjust the threshold value based on observed movements, thereby adapting to individual operating circumstances and external influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the activating braking pressure threshold value is set sufficiently high to guarantee the vehicle is kept at a standstill even with diminishing braking effect, then the reliability of maintaining vehicle standstill is improved, but the ease of operation deteriorates as the driver must exert intense pressure on the brake pedal
Solution Approach 1:
The activating braking pressure threshold value is made dynamic rather than static. The control device automatically adjusts the threshold value based on monitored vehicle movements during brake holding states. If movements exceed a threshold, the activating braking pressure threshold value is increased for subsequent brake holding activations, adapting to actual brake system performance and environmental conditions.
Solution Approach 2:
The system implements feedback by monitoring vehicle movements during activated brake holding states and using this information to adjust the activating braking pressure threshold value. The control device counts movements and compares them against a movement threshold value, then modifies the threshold accordingly to ensure reliable vehicle hold while maintaining ease of operation.
2Stability of the object's composition
If the activating braking pressure threshold value is set sufficiently high to counteract creeping torque on inclined roads, then the vehicle stability is improved, but the device complexity increases due to the need for automatic adjustment mechanisms
Solution Approach 1:
The control device performs multiple functions: it monitors braking pressure, detects vehicle movements, counts movements during brake holding states, and adjusts the activating braking pressure threshold value. This multi-functional approach avoids adding separate dedicated systems for each function, thereby limiting the increase in device complexity while achieving improved vehicle stability.
Solution Approach 2:
The brake holding system performs self-adjustment by automatically modifying its own activating braking pressure threshold value based on monitored performance. The system uses its existing monitoring capabilities to detect when adjustment is needed and autonomously adjusts the threshold, eliminating the need for external manual calibration or complex additional control systems.
3Reliability
If the activating braking pressure threshold value is increased to prevent unwanted vehicle movements, then the vehicle control reliability is improved, but the ease of operation worsens as the driver experiences reduced system responsiveness
Solution Approach 1:
The threshold value adjusts dynamically based on actual vehicle movements rather than being statically high from the start. This allows the system to remain responsive to driver input under normal conditions while automatically increasing the threshold only when movements indicate a need for higher braking pressure, thus maintaining both reliability and responsiveness.
Solution Approach 2:
The system changes the parameter (activating braking pressure threshold value) based on monitored conditions. Rather than maintaining a constantly high threshold, the parameter is adjusted only when vehicle movements during brake holding states exceed acceptable levels, preserving system responsiveness while ensuring control reliability when needed.
Data Source
AI summary
A method is provided to adjust an activating braking pressure threshold value of an automatic vehicle brake holding system of a vehicle. If a braking pressure that is generated through actuation of a vehicle brake of the vehicle exceeds an activating braking pressure threshold value while the vehicle is at a standstill, a brake holding state of the vehicle brake holding system is activated and a procedure for ascertaining time is started. A vehicle movement is ascertained during an activated brake holding state within a monitoring procedure period of time since starting the procedure to ascertain time. If a movement occurs within the monitoring procedure period of time, a value of a number of ascertained movements is increased. If this value exceeds a movement threshold value, the activating braking pressure threshold value is increased and the value of the number of ascertained movements is reduced.