Wave Transmission Circuits Timing Alignment ECU Load
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Solution Overview
Problem
Existing object detection systems in vehicles face functional restrictions due to high communication loads between the ECU and multiple wave transmission/reception circuits, such as sonar modules, which can impede efficient object detection and vehicle control.
Innovation Solution
The system includes a plurality of wave transmission/reception circuits that autonomously align start timings for wave transmission and reception using time adjustment information, reducing the need for frequent ECU intervention and minimizing communication loads, with each circuit comprising a timing circuit, wave transmission/reception control circuit, and a processing circuit that outputs time adjustment information and detects objects based on distance measurement data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the ECU instructs each wave transmission/reception circuit to start wave transmission and wave reception to align start timings, then the start timings between circuits are aligned, but the communication load on the ECU increases significantly
Solution Approach 1:
Each wave transmission/reception circuit is equipped with a timing circuit that autonomously measures time and adjusts its own start timing based on time adjustment information stored in its memory circuit. This self-service mechanism eliminates the need for continuous ECU intervention, reducing communication load while maintaining precise timing alignment across all circuits
Solution Approach 2:
The ECU outputs time adjustment information to each wave transmission/reception circuit in advance, before actual wave transmission begins. Each circuit stores this information in its memory circuit and uses it to pre-adjust its timing, ensuring synchronized start times without requiring real-time communication during operation
2Adaptability or versatility
If multiple sensors are integrated into the ECU, then sensor functionality is consolidated, but the ECU becomes more complex and communication requirements increase
Solution Approach 1:
The system segments the timing control functionality by providing each wave transmission/reception circuit with its own timing circuit and memory circuit. This segmentation distributes the timing management burden from the central ECU to individual circuits, allowing sensor integration while reducing ECU complexity and communication requirements
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 allows for efficient object detection and reduced communication burdens on the ECU, even when multiple sensors are integrated, thereby enhancing vehicle control and reducing the risk of functional restrictions.
Implementation Method 1
detecting a surrounding object by transmitting and receiving ultrasonic waves by a sonar module
Implementation Method 2
measures time by using time adjusted based on time adjustment information
Data Source
AI summary
An object detection device according to the present disclosure includes: wave transmission/reception circuits which, in operation, detect a received wave transmitted to and reflected from an object; and a processing circuit connected to the wave transmission/reception circuits. Each of the wave transmission/reception circuits includes a timing circuit which, in operation, measures time by using time adjusted based on time adjustment information, and a wave transmission/reception control circuit which, in operation, performs wave transmission or wave reception based on the time measured by the timing circuit. The processing circuit includes: an output circuit which, in operation, outputs the time adjustment information to at least one of the wave transmission/reception circuits; and an object detection circuit which, in operation, detects the object by using distance measurement information based on the wave transmission and the wave reception input from the wave transmission/reception circuits.