Asymmetric Control Logic for Vehicle Driver Assistance
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Solution Overview
Problem
Vehicle driver assistance systems using transmitter/receiver sensors often experience false positives, leading to unnecessary automatic interventions, such as emergency braking, which can be problematic, especially in low-speed scenarios where such interventions interfere with intended vehicle movement.
Innovation Solution
A control system that uses different conditions for activating and deactivating the driver assistance system, allowing for asymmetric transitions between active and inactive states, thereby reducing the likelihood of incorrect interventions by relying on multiple sub-conditions and parameters indicative of specific vehicle states, such as parking or on-road situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transmitter/receiver sensor is used for detecting the environment, then the system can detect objects and provide automatic intervention, but false positives occur leading to unnecessary automatic interventions
Solution Approach 1:
The patent applies asymmetry by using different conditions for activating and deactivating the driver assistance system. The activation condition (first condition) differs from the deactivation condition (second condition), creating an asymmetric state transition mechanism that prevents false positives from causing unnecessary interventions while maintaining reliable hazard detection.
Solution Approach 2:
The patent changes the parameters governing system state transitions by introducing distinct activation and deactivation conditions. Instead of using the same threshold or condition for both entering and exiting the active state, the system uses different parameter sets that account for the directional nature of state changes, thereby reducing false positive interventions.
2Reliability
If the driver assistance system activates automatically on detecting a hazard, then collision avoidance is improved, but incorrect interventions occur interfering with intended vehicle movement
Solution Approach 1:
The asymmetric state transition mechanism ensures that the system activates under specific hazard conditions but requires different, more stringent conditions for deactivation. This prevents the system from incorrectly deactivating during intended vehicle movements while maintaining collision avoidance capability when hazards are present.
Solution Approach 2:
The patent introduces an intermediary control layer that mediates between hazard detection and system activation/deactivation. This intermediary layer evaluates multiple conditions and parameters before transitioning system states, acting as a buffer that prevents direct, potentially erroneous responses to sensor inputs while maintaining safety.
3Device complexity
If the system uses the same condition for both activation and deactivation, then the control logic is simple, but false positives cause unnecessary deactivation during intended movements
Solution Approach 1:
The patent deliberately introduces asymmetry into the control logic by using different conditions for activation and deactivation. While this increases complexity compared to symmetric control, it significantly improves reliability by preventing false positives from causing unnecessary deactivation during intended vehicle movements.
Solution Approach 2:
The control logic is made dynamic by allowing different conditions to apply depending on the current system state. When the system is inactive, one set of conditions applies for activation; when active, a different set applies for deactivation. This dynamic approach improves reliability while keeping the control logic manageable through state-dependent rules.
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 approach enhances the accuracy of driver assistance system interventions by ensuring that the system remains active only when necessary, minimizing false positives and improving the driving experience by maintaining the system's state based on distinct and unrelated conditions.
Implementation Method 1
The transmitter transmits a signal that is reflected by the environment near to a vehicle. The reflected signal is detected by the receiver.
Implementation Method 2
The transmitter may transmit electro-magnetic waves (e.g. radio detection and ranging (radar))
Implementation Method 3
The transmitter may transmit electro-magnetic waves (e.g. radio detection and ranging (radar) or light detection and ranging (lidar))
Implementation Method 4
the transmitter may transmit ultrasonic sound waves and the receiver may then detect the reflected ultrasonic sound waves
Data Source
AI summary
A control system (100) for an emergency braking system (200) using at least one transmitter/receiver sensor (210) comprising: means for causing automatic transition, from a first state (310) in which the emergency braking system (200) is inactive to a second state (320) in which the emergency braking system (200) is active, in dependence upon satisfaction of a first condition (412); and means for causing automatic transition from the second state (320) to the first state (310) in dependence upon satisfaction of a second condition (421) different to the first condition (412) wherein transition from the second state (320) to the first state (310) does not occur in dependence upon the first condition (412) no longer being satisfied, and/or transition from the first state (320) to the second state (310) does not occur in dependence upon the second condition (421) no longer being satisfied.