Hill Hold Control Using Distance Sensors to Prevent Roll Collisions
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Solution Overview
Problem
Existing motor vehicle brake systems, such as Automated Vehicle Hold (AVH) and Hill Hold Control (HHC), do not account for the vehicle's environment, leading to potential collisions when stationary on inclined roadways due to unintentional movement, as they lack the ability to react to changes in surrounding vehicles.
Innovation Solution
A driver-independent brake force retention method using distance sensors to monitor the distance to neighboring vehicles in both uphill and downhill directions, adjusting brake pressure to prevent collisions by reducing or increasing brake force based on predetermined limit values, thereby maintaining vehicle stability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If driver-independent brake force retention is maintained on inclined roadways, then vehicle stability is improved, but collision risk with neighboring vehicles increases due to unintentional movement
Solution Approach 1:
The system performs preliminary actions by reducing brake force before a collision occurs. When the distance to a neighboring vehicle falls below a predetermined limit value, the brake control device proactively reduces brake force to prevent unintentional rolling movement that could cause a collision, rather than waiting for the collision to occur first.
Solution Approach 2:
The system uses feedback from distance sensor systems to continuously monitor the distance to neighboring vehicles and adjusts brake force accordingly. The brake control device receives distance information and modifies brake force retention based on the real-time spatial relationship with other vehicles, creating a closed-loop control system that prevents collisions.
2Stability of the object's composition
If driver-independent brake force retention is maintained, then vehicle remains stationary, but ability to react to environmental changes is reduced
Solution Approach 1:
The system incorporates feedback from distance sensor systems that continuously monitor the environment (distance to neighboring vehicles). This feedback enables the brake control device to adapt brake force retention to environmental changes while maintaining stationary position, resolving the contradiction between stability and adaptability.
Solution Approach 2:
The system performs self-service by automatically detecting environmental changes and adjusting brake force without driver intervention. The brake control device monitors distance to neighboring vehicles and autonomously modifies brake force retention to prevent collisions, enabling the vehicle to react to environmental changes while remaining stationary.
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
This method enhances the functionality of existing brake systems by preventing collisions with neighboring vehicles by proactively adjusting brake pressure, ensuring the vehicle remains stationary or moves safely, thus reducing the risk of damage to both vehicles involved.
Implementation Method 1
the brake system reduces the brake pressure and releases the vehicle for driving again
Data Source
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Figure 3
AI summary
The invention relates to a method for carrying out a driver-independent brake force holding function in a motor vehicle when same is stationary on a road angled in the longitudinal direction of the vehicle, wherein the driver-independently maintained brake force is reduced when a release condition is fulfilled, wherein, in the method, the uphill distance is determined by a first distance sensor system, said uphill distance corresponding to the gap or distance to the neighbouring vehicle in the uphill direction, and if a predetermined limit value is not met by the uphill distance, the brake force is reduced before the release condition is fulfilled, so that the motor vehicle moves.