CN2142804Y - Front or rear-distance measuring device for automobile - Google Patents

Abstract

The utility model relates to a front or rear distance measuring device for automobiles, which comprises a host machine, two ultrasonic probes and a distance displaying device, wherein the ultrasonic probes and the distance displaying device are connected with the host machine. A panel of the host machine is provided with a digital display screen (5), and the ultrasonic probes are respectively provided with transmitting transducers and receiving transducers. The distance measuring device has the circuit that oscillators send out the electrical oscillation signals of 40 K, the signals are amplified to drive the transducers to covert the electrical signals into ultrasonic signals for sending out. The receiving transducers receive ultrasonic reflected signals and convert the ultrasonic reflected signals into the electric signals. After the electric signals are amplified, the electric signals are transmitted to a driving switching circuit to convert electric pulse into the digitals for the measured distance. The digitals are displayed on the distance displaying device which can prompt the driver of an automobile and the driver of the hinder automobile to prevent the overtaking collision accidents of the automobiles from happening.

Description

Front or rear-distance measuring device for automobile

The utility model belongs to a kind of vehicle body fittings, is meant a kind of macrometer that is assemblied in the automobile front and back especially.

Automobile driver is when driving a car, with regard to line-of-sight distance, the sight line of automobile both sides can be observed situation by the both sides light deflector, but vehicle front subregion and subregion, automobile rear are chaufeur vision blind areas, and the back vision area of some vehicle be cannot see at all, for example all kinds special vehiclees such as truck, carryall, van cooler, cash transport van, because the back vision area blind area of these vehicles is too big, chaufeur mainly is by rule of thumb when reversing, thus dangerous big, the accident probability height.

The purpose of this utility model provides a kind of macrometer that is installed in before and after the automobile, utilizes the ultrasonic ranging principle, measures automatically and the distance of display automobile and its front and back obstacle.

The utility model macrometer comprises a main frame, two ultrasonic probes and a telltale, the driving change-over circuit that is equiped with ultrasonic emitting and acceptor circuit, benchmark oscillating impulse circuit in this main frame and is attached thereto, drive change-over circuit in beginning to be emitted to the time interval that receives reflected signal certainly, reference pulse signal is counted, and convert thereof into apart from number, its output links to each other with telltale, with show range finding from.

Two ultrasonic probes of the utility model macrometer can be installed in the front and back of automobile respectively, the distance indication screen is arranged on the host panel, another telltale is contained on the vehicle rear window glass, chaufeur can be understood the distance of own spacing front and back car or preceding obstacle easily, but also the distance between car chaufeur two cars after can pointing out, thereby can guarantee safety traffic.

The utility model macrometer is reasonable in design, and is easy to use, install simply, and intuitive display, highly versatile can be installed on the various vehicles, and not need former car is reequiped.And this macrometer is cheap, and production technology is simple, need not great amount of investment.

Describe the utility model embodiment in detail below in conjunction with accompanying drawing.

Fig. 1 is the utility model macrometer outward appearance front elevational schematic.

Fig. 2 is the utility model macrometer functional-block diagram.

Fig. 3 is the utility model macrometer schematic circuit diagram.

The utility model macrometer as shown in Figure 1, comprises main frame (1), two ultrasonic probes (2) that link to each other with main frame (1), (3), range display (4); Digital display screen (5), front and back change-over swith (6) and source switch (7) and power light (8) etc. are housed on the host panel; Ultrasonic probe (2) (3) is connected on main frame (1) rear panel, and probe respectively is equiped with on (2) (3) and transmits and receives transducer (2-1) (2-2) and (3-1) (3-2);

The basic functional principle of the utility model macrometer as shown in Figure 2, oscillator A sends 40K electric oscillation signal, amplifies through amplifying circuit B, promotes ultrasound transmitting transducer C and the electric oscillation signal is converted to ultrasonic signal launches; Ultrasonic signal runs into obstacle X back reflection returns, and is received and switching electrical signals by super sonic receiving transducer D, amplifies through amplifying circuit E, delivers to driving change-over circuit F and converts electric pulse to range finding from numeral, is shown in telltale G.

The ranging circuit principle as shown in Figure 3, frequency be 40K oscillator (11) the emission oscillation control circuit (10) control under, intermittently send transmitter pulse, as per second emission once, this transmitter pulse through shaping circuit (12) or (13) shaping deliver to transmitting transducer (2-1) (3-1) (schematic diagram 3 illustrates) launch ultrasonic signal; Benchmark oscillation source (14) is supplied with conversion driving circuit (15) (16) basic pulse, and conversion driving circuit (15) (16) links to each other with digital display (4) (5) respectively; Countdown circuit (100) is sending emissioning controling signal simultaneously, send synchronous triggering signal and give bistable circuit (19), the output signal control transformation driving circuit (15) (16) of bistable circuit (19) is started working under this energizing signal effect, promptly begins basic pulse is counted; Be installed in before and after the probe on super sonic receiving transducer (2-2) (3-2) receive the ultrasonic signal that is reflected by obstacle after, converting thereof into electric signal delivers to amplifier (22) (23) respectively and amplifies, deliver to another trigger end of bistable circuit (19) through change-over switch K, make bistable circuit (19) upset, its output quits work conversion driving circuit (15) (16), conversion driving circuit (15) (16) will begin that the basic pulse number conversion of counting becomes tested range data during quit work, and deliver to digital display (4) (5) (promptly being installed in digital display screen (5) and digital display (4) on main frame (1) panel) respectively and show; Described each circuit and transducer all adopt commercially available integrated circuit commonly used, wherein 40K oscillating circuit (11), emission shaping circuit (12,13), basic pulse hunting of frequency source (14), bistable circuit (19) all adopt integrated circuit 4069, drive change-over circuit (15) (16) and adopt integrated circuit 4511, ultrasonic emitting and receiving transducer (2-1,3-1) and (2-2) (3-2) be T40-16 and R40-16, the method for attachment of circuit connects by the common method of used integrated circuit; Countdown circuit (10) is a low-frequency oscillatory network.

When macrometer was used in before and after the utility model automobile, main frame (1) can be installed on the indoor chaufeur of the vehicle drive operating panel in front, after probe (2) (3), front and back are installed in the car front truck respectively; When chaufeur need to be grasped oneself car and front truck or preceding obstacle between apart from the time, can be by change-over swith K(6) be transformed into preceding probe, thereby directly read range data from the digital display screen (5) of main frame (1); Digital display (4) can be installed on the car back window glass, directly shows apart from the distance of back car, and prompting back car chaufeur is to prevent to compel the tail accident.

Claims (1)

1, the forward and backward macrometer of a kind of automobile comprises main frame (1), two ultrasonic probes (2) that link to each other with main frame (1) and (3), range display (4); Digital display screen (5), front and back change-over swith (6) are housed on the host panel; Be equipped with respectively on the ultrasonic probe (2) (3) and transmit and receive transducer (2-1) (2-2) and (3-1) (3-2); The interior ranging circuit of main frame (1) is: output and the frequency of emission oscillation control circuit (10) is that the oscillator (11) of 40K links to each other, control generator (11) intermittently sends transmitter pulse, and this impulse singla is delivered to transmitting transducer (2-1) through shaping circuit (12,13) shaping and (3-1) changed and launch ultrasonic signal; Reference oscillator (14) links to each other with conversion driving circuit (15) (16) input end, supplies with its basic pulse, and conversion driving circuit (15) (16) links to each other with digital display (4) (5) respectively; Another mouth of countdown circuit (10) links to each other with bistable circuit (19), sending emissioning controling signal simultaneously, send synchronous triggering signal and give bistable circuit (19), the work of the output signal control transformation driving circuit (15) (16) of bistable circuit (19) begins basic pulse is counted under this energizing signal effect; Be installed in before and after the probe on super sonic receiving transducer (2-2) (3-2) receive the ultrasonic signal that is reflected by obstacle after, converting thereof into electric signal delivers to amplifier (22) (23) respectively and amplifies, deliver to another trigger end of bistable circuit (19) again through change-over switch K, make bistable circuit (19) upset, its output quits work conversion driving circuit (15) (16), conversion driving circuit (15) (16) will begin that the basic pulse number conversion of counting becomes tested range data during quit work, and deliver to digital display (4) (5) respectively and show.

Images