초록 ▼

Car collision prevention apparatus and method comprises a slave processor for transmitting and receiving a laser beam or an ultrasonic wave signal to extract distance information between a car and a car in front, and a master processor for comparing the extracted distance information from the slave

Car collision prevention apparatus and method comprises a slave processor for transmitting and receiving a laser beam or an ultrasonic wave signal to extract distance information between a car and a car in front, and a master processor for comparing the extracted distance information from the slave processor with a safety distance between the car and the front car based on a car speed and performing car accelerating or decelerating and alarm functions in accordance with the compared result. The slave processor comprises a long-distance sensing laser sensor and a short-distance sensing ultrasonic wave sensor disposed in a front side of the car, the long-distance sensing laser sensor consisting of a laser trigger circuit, a laser transmitter and a laser receiver, the short-distance sensing ultrasonic wave sensor consisting of an ultrasonic wave trigger circuit, an ultrasonic wave transmitter and an ultrasonic wave receiver. The long-distance sensing laser sensor is driven in long-distance mode of the car in which the car speed is higher than a reference speed. The short-distance sensing ultrasonic wave sensor is driven in short-distance mode of the car in which the car speed is lower than the reference speed.

대표청구항 ▼

A car collision prevention apparatus mountable in a car, comprising: slave processing means for transmitting and receiving one of a laser beam and an ultrasonic wave signal to extract distance information corresponding to a distance between said car and a car in front of said car; and master process

A car collision prevention apparatus mountable in a car, comprising: slave processing means for transmitting and receiving one of a laser beam and an ultrasonic wave signal to extract distance information corresponding to a distance between said car and a car in front of said car; and master processing means for comparing the distance information from said slave processing means with a predetermined safety distance corresponding to a desired distance between said car and said car in front based on a car speed of said car and performing car accelerating or decelerating and alarm functions in accordance with a compared result, and for initiating one of a long-distance operation mode and a short-distance operation mode based upon said car speed and a reference speed; said slave processing means including: laser trigger means for generating a laser trigger pulse signal in response to a drive signal from said master processing means, the laser trigger pulse signal being produced during said long-distance operation mode selected by said master processing means when said car speed is higher than said reference speed; laser transmission means for emitting said laser beam externally in response to said laser trigger pulse signal from said laser trigger means; laser reception means for receiving said laser beam after said laser beam is reflected off of said car in front; ultrasonic wave trigger means for generating an ultrasonic wave trigger pulse signal in response to said drive signal from said master processing means, the ultrasonic wave trigger pulse being produced during said short-distance operation mode selected by said master processing means when said car speed is less than or equal to said reference speed; ultrasonic wave transmission means for emitting said ultrasonic wave signal externally in response to said ultrasonic wave trigger pulse signal from said ultrasonic wave trigger means and an ultrasonic wave control signal; ultrasonic wave reception means for receiving said ultrasonic wave signal after said ultrasonic wave signal is reflected off of said car in front; counting means for generating time data by starting a counting operation in response to the laser trigger pulse signal from said laser trigger means or the ultrasonic wave trigger pulse signal from said ultrasonic wave trigger means and stopping the counting operation in response to an output signal from a respective one of said laser reception means or said ultrasonic wave reception means; and distance information transmission means for converting said time data from said counting means into said distance information and transmitting said distance information to said master processing means; and said ultrasonic wave reception means including: an ultrasonic wave receiving sensor for receiving the ultrasonic wave signal emitted from said ultrasonic wave transmission means and reflected off of said car in front; a first amplifier for amplifying said output signal from said ultrasonic wave receiving sensor to produce an amplified output signal; a band pass filter for band pass filtering said amplified output signal from said first amplifier to remove a noise component therefrom; a second amplifier for amplifying an output signal from said band pass filter; a detector for detecting an output signal from said second amplifier and outputting a detected signal in a digital form; a comparator for comparing said detected signal from said detector with said ultrasonic wave control signal from said ultrasonic wave transmission means; a reference time operating circuit for generating a reference time period signal in response to the ultrasonic wave control signal from said ultrasonic wave transmission means; a time comparator for comparing an output signal from said comparator with the reference time period signal from said reference time operating circuit; and a signal adjustment unit for adjusting an output signal from said time comparator to permit processing by said distance information transmission means.