Vehicle Brake Override via Differential Pedal Angle
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Solution Overview
Problem
Existing vehicle collision avoidance systems face issues with incorrect interpretations of driver intentions due to faulty sensor data or intervention timing, leading to unintended activation of the accelerator during emergency braking, which can result in prolonged collision consequences.
Innovation Solution
A method that automatically decelerates a vehicle by triggering the brake system at a determined intervention point-in-time, with automatic deactivation of the braking intervention based on an actuation of the accelerator that depends on the actual driving dynamics, specifically using a differential pedal angle calculated from the remaining accelerator travel, to accurately recognize the driver's override intention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the accelerator actuation is used as an overriding mechanism, then the override is intuitive and corresponds to the logical counter effect to braking, but unintentional actuation during hard braking may be erroneously interpreted as an intention to override
Solution Approach 1:
The system changes the evaluation parameter from simple accelerator position to differential pedal angle (change in accelerator angle over time). This allows the system to distinguish between intentional override (deliberate accelerator movement) and unintentional actuation (passive falling into the pedal during hard braking), resolving the contradiction between intuitiveness and reliability.
2Reliability
If the kick-down switch actuation is used as an overriding mechanism, then the system can distinguish intentional override, but it requires extensive accelerator travel that may have undesirably accelerating effect and consumes time
Solution Approach 1:
Instead of requiring full kick-down switch actuation (excessive action), the system uses a partial action threshold - a specified differential pedal angle that is sufficient to indicate override intention but does not require the full travel distance. This reduces the time loss while maintaining reliable intention recognition.
3Device complexity
If a fixed threshold for accelerator actuation is used to detect override intention, then the system is simple to implement, but it cannot adapt to different driving situations and deceleration levels
Solution Approach 1:
The system transitions from a static fixed threshold to a dynamic threshold that adapts to current driving conditions. The differential pedal angle threshold is adjusted based on actual deceleration levels and driving situation, allowing the system to maintain simplicity while gaining adaptability to different scenarios.
Data Source
AI summary
A method is provided for automatically decelerating a vehicle to avoid a collision or reduce the consequences of a collision with a detected collision object, wherein, at a determined intervention point-in-time, a brake system of the vehicle is automatically triggered such that a deceleration of the vehicle is caused, and wherein an automatic deactivation of the automatic braking intervention can take place by an increased actuation of the accelerator. A deactivation is carried out as a function of an override maneuver that depends on the actual driving dynamics, particularly an actuation of the accelerator that depends on the actual driving dynamics.