Master-Slave PDC Ultrasonic Sensor Architecture
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Solution Overview
Problem
Conventional parking distance control (PDC) systems with master and slave sensors face high costs due to the presence of microprocessors in each sensor, leading to increased complexity and interference issues with long data cables, which affect detection distance, energy efficiency, and anti-interference performance.
Innovation Solution
A master-slave compatible PDC system is developed, where the master sensor includes a CPU module, ultrasonic transducers, and drive modules, while slave sensors are digital probes with ultrasonic ICs and boost drive modules, allowing for integrated signal and power transmission, and configurable parameters for improved detection and interference resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If each sensor is equipped with a microprocessor (CPU), then each sensor can independently process signals and make decisions, but the system cost increases significantly
Solution Approach 1:
The system divides sensors into master sensors (with CPU) and slave sensors (without CPU). Master sensors perform centralized signal processing and control, while slave sensors only execute simple detection and signal transmission functions. This segmentation eliminates the need for microprocessors in slave sensors, significantly reducing system cost while maintaining automated detection capabilities through the master sensors.
Solution Approach 2:
The CPU functionality is extracted from individual slave sensors and centralized in master sensors. Slave sensors are reduced to simple transducers that convert physical quantities to electrical signals, delegating all complex signal processing, decision-making, and control functions to the master sensors. This extraction eliminates unnecessary microprocessors from slave sensors, reducing overall system complexity and cost.
2Adaptability or versatility
If long data cables are used to connect multiple sensors to the control box, then all sensors can be connected, but signal interference increases and detection precision deteriorates
Solution Approach 1:
The system segments the sensor network into master-slave groups where slave sensors are closely positioned near master sensors. This spatial segmentation reduces cable lengths significantly, as slave sensors connect to nearby master sensors rather than requiring long cables to reach a centralized control box. The segmentation maintains comprehensive sensor coverage while minimizing interference-prone cable lengths.
3Device complexity
If multiple sensors are connected via shared cables, then the system structure is simplified, but signal interference increases due to integrated power and signal transmission
Solution Approach 1:
The cable system is segmented into separate power cables and signal cables. Power cables transmit electrical power from the power supply to sensors, while signal cables transmit detection signals from sensors to the control unit. This physical separation prevents power frequency interference and electrical noise from coupling into signal lines, eliminating the interference problems associated with integrated cable designs while maintaining structural simplicity.
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
The system achieves a longer detection distance, enhanced anti-interference capabilities, and reduced interference, with separate signal and power cables providing more reliable and stable signals, while maintaining system functionality similar to traditional PDC systems with or without a host.
Implementation Method 1
a first ultrasonic transducer (32), a master drive module (33)
Implementation Method 2
the first ultrasonic transducer (32), a master drive module (33)
Data Source
AI summary
A master-slave compatible PDC system, comprising a master sensor, at least one slave sensor, which comprises an ultrasonic IC, a boost drive module, and a second ultrasonic transducer; the CPU module drives the first ultrasonic transducer via the master drive module, the first ultrasonic transducer amplifies and transmits echoed signals to a A/D conversion module of the CPU module via a master amplifier module, the CPU module drives the ultrasonic IC of the corresponding slave sensor via a slave drive module, the ultrasonic IC drives the second ultrasonic transducer via the boost drive module, and the second ultrasonic transducer feeds back the echoed signal to the A/D conversion module of the CPU module via the ultrasonic IC. In the Invention, the ultrasonic IC is employed for each slave sensor, enabling a farther detection distance and stronger anti-interference capability of the whole system.