Vehicle Ultrasonic Detection Timing for Interference Avoidance
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Solution Overview
Problem
Conventional object detection devices in vehicles face interference issues when both vehicles equipped with the same interference avoidance method synchronize their transmission timings, leading to ineffective interference avoidance.
Innovation Solution
An object detection device that adjusts transmission timing of ultrasonic waves based on a random time determined by the shift position of the vehicle's shift lever, differentiating the timing for transmission units at the front and rear of the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both vehicles use the same interference avoidance method, then each vehicle can avoid interference individually, but the transmission timings coincide and interference occurs
Solution Approach 1:
The patent applies local quality by differentiating the random time adjustment based on the shift position (front or rear transmission units). Each transmission unit uses a different random time delay corresponding to its location, ensuring that even though both vehicles use the same interference avoidance method, their actual transmission timings do not coincide, thus preventing interference.
2Ease of manufacture
If random time is determined without considering shift position, then the method is simple, but transmission timings may coincide with other vehicles
Solution Approach 1:
The patent applies dynamics by making the random time adjustment dynamic based on the shift position. Instead of using a fixed or purely random time, the system dynamically selects the random time according to which transmission unit (front or rear) is active, as detected by the shift position sensor. This dynamic adjustment ensures effective interference avoidance while maintaining reasonable control logic complexity.
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
Effectively avoids ultrasonic wave interference by delaying transmission timing according to shift position, ensuring accurate object detection even when other vehicles with the same device are present.
Implementation Method 1
receives a reception wave generated by reflection of the transmission wave against the object
Data Source
AI summary
An object detection device according to an embodiment is an object detection device installed in a vehicle to detect an object present around the vehicle, the object detection device including: a control unit that controls a transmission/reception unit that transmits a transmission wave and receives a reception wave generated by reflection of the transmission wave against the object, the control unit controlling the transmission/reception unit to transmit the transmission wave at a predetermined transmission timing; and a determination unit that determines a random time as a standby time for shifting the transmission timing, the random time being determined in accordance with a shift position that is a position of a shift lever for switching a transmission of the vehicle. The control unit controls the transmission/reception unit to transmit the transmission wave at a new transmission timing obtained by delaying the transmission timing by the determined random time.