Ultrasonic Object Detection Crosstalk Prevention Timing Control
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Solution Overview
Problem
Existing object detection apparatuses using ultrasonic waves face challenges with crosstalk, leading to errors in distance calculation and potential malfunctions in driver assistance systems, particularly when multiple devices are present, and current solutions like infrared sensors increase costs and are impractical for existing systems.
Innovation Solution
An object detection apparatus that introduces a temporary waiting time between transmission/reception periods when a crosstalk identification condition is met, allowing for differentiation between actual reflection waves and interfering waves, thereby reducing the likelihood of malfunctions without the need for additional hardware like infrared sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an infrared sensor is added to prevent crosstalk, then crosstalk prevention capability is improved, but device cost and complexity increase
Solution Approach 1:
The patent changes the timing parameter of ultrasonic wave transmission by introducing a temporary waiting time between transmission/reception periods when crosstalk is detected. This temporal parameter adjustment allows the system to distinguish between reflection waves and crosstalk waves without adding hardware, thereby resolving the contradiction between reliability improvement and cost increase.
2Reliability
If the transmission interval is varied randomly to prevent crosstalk, then crosstalk identification capability is improved, but the transmission/reception cycle becomes longer
Solution Approach 1:
The patent dynamically adjusts the transmission timing by introducing a temporary waiting time only when crosstalk identification conditions are met, rather than randomly varying the transmission interval. This conditional dynamic adjustment maintains short transmission/reception cycles during normal operation while enabling crosstalk identification when necessary, resolving the contradiction between reliability and time loss.
3Measurement precision
If a temporary waiting time is inserted between transmission/reception periods to identify crosstalk, then measurement precision is improved, but the transmission/reception cycle increases
Solution Approach 1:
The patent applies preliminary anti-action by inserting a temporary waiting time before the next transmission/reception period when crosstalk is identified. This waiting time allows the system to clear the crosstalk interference from the reception buffer, ensuring that subsequent distance measurements are not contaminated by previous crosstalk events, thereby improving measurement precision while minimizing time loss through conditional application.
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 minimizes the possibility of driver assistance system malfunctions due to crosstalk, reduces costs by avoiding the need for additional sensors, and shortens the transmission/reception cycle by inserting temporary waiting times only when necessary.
Implementation Method 1
a transceiver that repeatedly transmits a wave as an ultrasonic wave and receives a reflection wave of the transmission wave reflected by an object
Implementation Method 2
a distance calculator that calculates a distance to the object, based on a time interval from a moment when the transceiver transmits the wave to a moment when the reflection wave is received
Data Source
AI summary
An object detection apparatus is arranged to detect the distance to the object and includes: a transceiver repeatedly transmitting a wave as an ultrasonic wave and receives a reflection wave of the transmission wave; a transmission controller controlling the transceiver to transmit the transmission wave; a distance calculator calculating a distance to the object, based on a time interval from a moment when the transceiver transmits the wave to a moment when the reflection wave is received; and a transmission timing controller controlling timing at which the transmission controller controls the transmission wave to be transmitted. Moreover, the transmission timing controller inserts at least one type of temporary waiting time between a transmission/reception period in which the transceiver transmits the transmission wave and receives the reflection wave and a next transmission/reception period, when a predetermined crosstalk identification condition is established based on the distance to the object.