Ultrasonic automobile anti-collision system having temperature compensation function and adopting pulse counting

Abstract

The invention discloses an ultrasonic automobile anti-collision system having a temperature compensation function and adopting pulse counting. The system comprises a microcontroller module as well as an ultrasonic transmitting module, an ultrasonic receiving module, a temperature measuring module, a display module, an alarm module, a brake speed-reducing module and a power module which are connected with the microcontroller module, wherein the microcontroller module comprises a counting unit, a data processing unit, a parameter comparing unit and a control unit, the ultrasonic transmitting module comprises an oscillator, a constant-current transmitting circuit, a first instruction transmitting circuit and an ultrasonic transmitting probe which are sequentially connected, and the ultrasonic receiving module comprises an ultrasonic receiving probe, an amplifying circuit, a shaping circuit and a second instruction transmitting circuit which are sequentially connected. The system can effectively avoid effects caused by temperature changes on the distance measuring accuracy and remind a driver timely through calculating the automobile distance accurately, so that automobile accidents are effectively avoided.

Description

technical field [0001] The invention relates to an automobile anti-collision system, in particular to an ultrasonic automobile anti-collision system with temperature compensation and pulse counting, which belongs to the field of automobile anti-collision control. Background technique [0002] Ultrasound is a kind of mechanical vibration in elastic medium, which is caused by the vibration source in contact with the medium, and its frequency is above 20kHz. Since the speed of ultrasonic waves is much smaller than the speed of light, its propagation time is easier to detect, and it is easy to directional emission, with good directionality and good intensity control, so the use of ultrasonic ranging is very important in many distance detection applications. Including non-destructive testing, process measurement, robot measurement and positioning, and fluid level measurement, etc. [0003] In the air, the propagation velocity of ultrasonic waves at normal temperature is 334m / s, ...

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Problems solved by technology

However, the influence of temperature has not been considered and the measurement accuracy needs to be further improved

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