Vehicle Sensor Echo Interference Detection Through Group Comparison
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Solution Overview
Problem
Interference in echo signals from a common electrical supply to vehicle sensors leads to incorrect object detection, particularly in driving assistance systems, due to ripple currents and high power demands, which existing circuit-based solutions are costly and inefficient.
Innovation Solution
A method for identifying and mitigating interference in echo signals by comparing echo signals within and between sensor groups with temporal offsets, allowing for reliable object detection without direct intervention in the supply source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sensors are connected to a common electrical supply via the control unit, then wiring complexity is reduced and installation is simplified, but interference in echo signals occurs due to ripple currents and high power demands
Solution Approach 1:
The sensor groups are divided into different sub-groups that operate in alternating time intervals. Sensors in one sub-group emit sensor signals during a first time interval while sensors in another sub-group receive echo signals during the same interval. This temporal segmentation prevents simultaneous transmission and reception that causes interference through the common supply line.
Solution Approach 2:
The sensor groups operate in periodic cycles with alternating transmission and reception phases. Each group emits sensor signals during its designated time interval and then switches to receiving mode. This periodic operation allows the common electrical supply to stabilize between transmission events, reducing ripple currents and interference in the echo signals.
2Measurement precision
If sensors emit sensor signals simultaneously in their respective group transmission phases, then measurement coverage is improved, but interference increases due to overlapping power demands on the common supply
Solution Approach 1:
Sensor groups are segmented into sub-groups that operate in alternating time intervals. During the first time interval, one sub-group transmits sensor signals while another sub-group receives echo signals. During the second time interval, the roles are reversed. This temporal segmentation ensures that transmission and reception do not overlap, eliminating interference while maintaining comprehensive environmental monitoring coverage.
Solution Approach 2:
The system dynamically switches between transmission and reception modes for different sensor sub-groups based on the current time interval. This dynamic operation allows the system to adapt the active state of each sensor group, ensuring that no two groups are in transmission mode simultaneously, thereby preventing interference while maintaining measurement coverage.
Data Source
AI summary
The invention relates to a method for operating a sensor arrangement (12) having a control unit (14) and a plurality of sensors (16) which are arranged in at least one group (18, 20), wherein the sensors (16) are connected to a common electrical supply, in particular via the control unit (14), comprising the steps of using the sensors (16) to emit sensor signals, wherein the sensors (16) in each group (18, 20) emit the sensor signals thereof in the particular group transmission phase thereof, receiving echo signals on the basis of reflections of the sensor signals, transmitting the received echo signals from the sensors (16) to the control unit (14), and identifying interference (38) in the received echo signals from the at least one group (18, 20) on the basis of a comparison of at least two of the received echo signals from the corresponding group (18, 20). The invention also relates to a corresponding sensor arrangement (12) for a vehicle (10) for operation according to the above method. The invention also relates to a driving assistance system for a vehicle (10) having a sensor arrangement (12) as described above.