Ultrasonic range finding obstacle avoidance system

Abstract

The invention belongs to the field of ultrasonic range finding and particularly relates to an ultrasonic range finding obstacle avoidance system, comprising a control processing unit, a serial port circuit, a power management module, a multichannel ultrasonic transceiver circuit and a CAN transceiver circuit, wherein the control processing unit is connected with the ultrasonic transceiver circuit,the serial port circuit, the power management module, and the CAN transceiver circuit; the power management module is used for supplying power to the ultrasonic transceiver circuit, the CAN transceiver circuit, and the control processing unit; the control processing unit is configured to communicate with a main control system and to control the operation of each module; the ultrasonic transceivercircuit is used for detecting an obstacle and measuring a distance; an isolation transformer drives a ultrasonic transmission circuit to match an adaptive transmission pulse control algorithm, so that the detection distance of the ultrasonic range finding obstacle avoidance system is increased, a transducer is driven by ultra-high voltage, and the power for transmitting ultrasonic waves is sufficiently large, thereby achieving higher detection sensitivity than that of a conventional driving method.

Description

technical field [0001] The invention belongs to the field of ultrasonic distance measurement, and in particular relates to an ultrasonic distance measurement and obstacle avoidance system. Background technique [0002] With the development of sensor technology, in the field of ranging sensors, there are three commonly used technical solutions as follows: infrared ranging, laser ranging and ultrasonic ranging. The infrared ranging sensor has the advantages of low cost and simple circuit structure, but its detection distance is relatively short and its accuracy is low; the laser ranging sensor has the highest detection distance and accuracy among the above three sensors, but its use cost is too high; The effect of the ultrasonic ranging sensor is between the infrared and laser ranging schemes. It has a moderate detection distance and high detection accuracy, and has high adaptability to the environment, especially for transparent objects (such as glass, etc.) Effective detect...

AI Technical Summary

Problems solved by technology

The echo processing circuit of the existing scheme adopts the method of first amplification and then filtering processing. Due to the difference in measurement distance, the echo signal fluctuates and changes, which also makes the signal have a large error.

like figure 2 As shown; the resulting problem is that while amplifying the echo signal, it also amplifies other noise signals, thus increasing the difficulty of the filter processing circuit, making the follow-up circuit more complicated, and reducing the response rate

Therefore, it brings the shortcomings of large detection blind area (the common minimum blind area is 20cm ~ 30cm) and low sensitivity; at the same time, the existing ultrasonic ranging mostly appears as a single module, only the serial port is reserved for debugging, and it cannot be used in long wired communication. The scene use of transmission distance is not conducive to integration with other systems

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