Vehicle Velocity Control Detecting Deviations Without External Sensors
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Solution Overview
Problem
Advanced Driver Assistance Systems (ADAS) face challenges in reliably detecting unexpected situations where they cannot maintain desired vehicle velocity values, particularly during automated parking maneuvers, and require effective measures to address these deviations without relying on external sensor data.
Innovation Solution
A method for closed-loop vehicle velocity control that analyzes movement status signals, such as differences between desired and actual vehicle velocities, to detect deviations from predetermined threshold ranges, allowing for immediate countermeasures like interrupting or terminating maneuvers, and requesting driver input or braking, without requiring external sensor data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the closed loop control maintains vehicle velocity within a predetermined value range, then the vehicle control stability is improved, but the system cannot reliably detect unexpected situations where velocity deviations occur
Solution Approach 1:
The patent implements feedback by continuously monitoring the actual vehicle velocity and comparing it with the desired velocity value. When the deviation exceeds the tolerance range for a predetermined time period, the system triggers an unexpected situation detection. This feedback mechanism enables reliable detection of velocity deviations without requiring complex additional sensors, as it utilizes existing velocity measurement capabilities.
Solution Approach 2:
The system performs self-diagnosis by using its own velocity measurement and control data to detect unexpected situations. Instead of relying on external sensor data or complex additional monitoring systems, the vehicle control system analyzes its own operational parameters (actual velocity, desired velocity, deviation magnitude and duration) to identify when something unexpected occurs, thereby maintaining detection reliability while avoiding increased device complexity.
2Adaptability or versatility
If the system allows short time period deviations from velocity range to accommodate maneuvers, then the maneuverability is improved, but the reliability of velocity control deteriorates
Solution Approach 1:
The patent applies dynamics by introducing a time-based criterion for unexpected situation detection. The system dynamically evaluates whether velocity deviations persist for a predetermined time period before triggering an alarm. This allows temporary deviations during normal maneuvers (improving adaptability) while reliably detecting sustained deviations that indicate unexpected situations (maintaining control reliability). The tolerance range and time period parameters enable the system to adapt its response based on the duration and magnitude of velocity deviations.
Data Source
AI summary
A method for a vehicle control procedure, wherein in the case of this vehicle control procedure a closed loop control of the vehicle velocity is performed on the basis of a predetermined desired value, may comprise the following steps: determining on the basis of at least one predetermined criterion whether in the case of the closed loop control the vehicle velocity leaves a value range that is defined by at least one velocity threshold value while taking into consideration a tolerance range that defines predetermined, permitted deviations from this value range; and implementing a corresponding measure while modifying the vehicle control procedure in dependence upon the result of this determination procedure, wherein the determination procedure is performed on the basis of a signal analysis of at least one measurement signal that describes the movement status of the vehicle.