CN2139702Y

CN2139702Y - Digital backsight meter for vehicle

Info

Publication number: CN2139702Y
Application number: CN 92233505
Authority: CN
Inventors: 吴望夏
Original assignee: Individual
Current assignee: Wu Wangxia
Priority date: 1992-09-16
Filing date: 1992-09-16
Publication date: 1993-08-04
Anticipated expiration: 2002-09-16

Abstract

The utility model relates to a digital backsight meter for a vehicle. The device is composed of a host machine 2 and an ultrasonic transducer 3; the host machine 2 is arranged in an operator cabin, and the ultrasonic transducer 3 is arranged at the tail of the vehicle. When the vehicle which is provided with the utility model keeps under steam, the utility model can carry out the real-time display for the distance between the vehicle and the object behind the vehicle. When the distance between the vehicle and the object behind the vehicle is less than the prescribed value, the backsight meter can automatically control the tail lamp and the brake lamp to flicker. At the backing time, the backsight meter can automatically detect the object behind the vehicle; when the distance between the vehicle and the object behind the vehicle is less than the prescribed distance, the backsight meter can send out the alarm sound with hurrying rhythm to remind the driver to immediately brake; therefore, the generating possibility of contingency is reduced. The utility model which is suitable for various vehicles has the advantages of reasonable structure.

Description

Digital backsight meter for vehicle

The utility model is a kind of motor vehicles backsight safety feature.

At present, often can see on the road that various vehicle afterbodys are with " maintaining safe distance ", printed words such as " attention brakes " remind driver and this car of trailing driving to maintain a certain distance, in the hope of reducing accident rate, but this changeless prompting, because inflexible form and writing fades, suffer reasons such as mud dirt coverage, do not play due effect.In addition, adopting " noting; reversing " reminiscences of voice technology can only be to the safe a kind of passive measure of moveing backward, as little barrier or any object that can not make a response to voice such as little livestock etc. are arranged in the Che Houzai driver blind area, remaining in the reversing driving makes the driver worry about part the most, car body bigger or night, rain, greasy weather, this worry about also bigger.

The purpose of this utility model provide a kind of can show in real time with car after the distance of object, and can when travelling and move backward, can control taillight and brake lamp flicker, the digital vehicle rearview instrument of reporting to the police automatically automatically.

The digital vehicle rearview instrument of the utility model, by the main frame 2 that is contained in the pilothouse optional position, the ultrasonic transducer 3 that is contained in motor vehicle tail is formed in the main frames and is comprised: a ultrasonic transmit circuit 43, and by being connected on the ultrasonic transducer emission ultrasound wave on this circuit.A ultrasound wave receiving circuit 44 receives echo by the ultrasonic transducer that is connected on this circuit.A range timer 45 is used to produce the range timing signal.A logic storbing gate 46, echoed signal or range timing signal are carried out clock-pulse generator 41 of logic gating, produce synchronizing signal, start ultrasonic transmit circuit 43 emission ultrasound waves and range timer 45 and produce the range timing signal, and make digital counter 47 begin counting.The basic pulse counting that 47 pairs of basic pulse generators of digital counter 42 produce, digital counter 47 stops counting by 46 controls of logic storbing gate.Count results by digital counter 47 shows the digital indicator of measured back distance with object.One is preset the digital comparator 51 of judging comparison to digital counter 47 output results and binary-coded decimal.An executive circuit 52 of pointing out according to the result of digital comparator 51.

The utility model can show the distance of object behind the car in real time, reminds the driver suitably to control the speed of a motor vehicle and brake time.During vehicle ', when after with spacing less than predetermined distance, it is luminous that rear-view device is controlled taillight and brake lamp or other light sources automatically, reminding subsequently, the driver notes spacing.The ruddiness that also glimmers synchronously of the light emitting diode on the host panel simultaneously.But manually stopping on the main frame gets out of the way pass hand off prompting light source scintillation, to adapt to the needs of different occasions, also this switch can be connected on the speedometer, makes it connect the light source scintillation circuit automatically after certain speed of a motor vehicle.Greater than the regulation spacing, light source extinguishes.During reversing, light emitting diode sends sodium yellow, when hind sight distance less than setting, fast Chinese percussion instrument sends rapid rhythmical chimes of doom, the prompting brake driver has reduced the possibility that mishap takes place.

Be described as follows with reference to the accompanying drawings:

Fig. 1 is the utility model assembly synoptic diagram.

Fig. 2 is the ultrasonic transducer front view.

Fig. 3 is the ultrasonic transducer left view.

Fig. 4 is the utility model theory diagram.

Fig. 5 is the utility model circuit diagram.

As shown in Figure 1, the utility model is by battery power inlead 1, main frame 2, and ultrasonic transducer 3 is formed.Main frame 2 can be fixed on the pilothouse optional position, and transducer 3 can be fixed on tailstock portion.As shown in Figure 2, transducer 3 is by ultrasonic sensor 8, outer cover 9, and terminal block 10, pedestal 11 and hold-down nut 12 are formed.

Run into object and be reflected when ultrasonic transducer sends ultrasound wave, after being received, measure the time interval T between emission and the reception, by Principles of Acoustics S=(1/2) TC, wherein C is the airborne velocity of sound, just can draw distance.

The basic pulse generator 15 transmitted reference pulses of forming by 1/2NE556, export the 1CP end of the basic counter 23 that constitutes by CD4518 to by VO1,23 pairs of basic pulse counting numbers of basic counter, select suitable basic pulse frequency, the numerical value that makes basic counter 23 counting and range finding from numerical value identical, so, count pulse number distance values just.Clock-pulse generator 16 emission synchronizing pulses by other 1/2NE556 forms trigger d type flip flop 31, allow counter-controller 22 countings that are made of CD4017.Synchronizing pulse exports the range timer of being made up of CD4538 34 simultaneously to, produces the range timing signal.Synchronizing pulse starts ultrasonic transmit circuit 43 emission ultrasound waves synchronously.Ultrasonic transmit circuit 43 comprises that the two-way switch 27A control that is made of CD4066 produces ultrasound wave by the ultrasonic oscillator 18 that NE555 constitutes, and through the power amplifier of being made up of triode 19, coil 20 is delivered to ultrasonic sensor 8B emission ultrasound wave.Owing to receive, send out the coupling of sensor, transponder pulse is fed to ultrasound wave receiving circuit 44.Ultrasound wave receiving circuit 44 comprises: ultrasonic sensor 8A, amplify by triode 35 with by the echo amplifier that the ultrasonic simulation circuit 21 that NYKD1B forms constitutes, through triode 32 shapings.Export to by the logic storbing gate of forming with door 33A and 33B 46, emission coupling signal and range timing signal are carried out the logic gating, make counter-controller 22 control basic counters 23 begin basic pulse is counted.Ultrasound wave receiving circuit 44 receives echo, exports logic storbing gate 46 to, and echo arbitrary time in range occurs effectively, and the signal of no to scale is with closing the shielding with door 33A.With after signal or range on limited signal through or a door 33B input counter-controller 22 control basic counters 23 stop counting, counter-controller 22 resets, make d type flip flop 31 sets simultaneously, the input of counter-controller 22 inhibiting pulses is found range up to the next synchronous pulse arrival next time.The digital counter that synchronizing pulse control is made up of d type flip flop and counter-controller 22 and basic counter 23 is once tested echo for 47 1 seconds.The digital indicator 48 that display driver of being made up of MC14511 24,25 and charactron 17 are formed shows measured back distance with object according to the count results of basic counter 23.In a measuring period, the binary-coded decimal of basic counter 23 is input to the A0-A3 end of the digital comparator of being made up of CD4585 26 simultaneously, and B0-B3 compares by turn with preset code.Executive circuit 52 is pointed out according to the FA＜FB as a result of digital comparator 26.Executive circuit comprises diode 40, by the flicker oscillator 36A that CD4069 forms, the 36B starting of oscillation is owing to manually stop to get out of the way the permission of pass 6, through two-way switch 27D and resistance 37, after 38 dividing potential drops, control makes it intermittently conducting by the

power switch

28,29 that TWH8778 forms, thereby make taillight, brake lamp 30 or other light sources flicker, simultaneously, the light emitting diode 14 on the host panel sends synchronous ruddiness.Manually stopping to get out of the way 6 the effect of closing is to close or the hook switch flash signal path, and whether make needs to start the prompting light source and determined by the driver.During reversing, because the connection of switch 5, by two-way switch 27B, resistance 39 has changed the BCD preset code of digital comparator 26, has promptly changed the command range of comparer, and two-way switch 27C is connected, make

flicker oscillator

36A, 36B, 36C, 36D, 36E, 36F has formed the oscillator of rapid rhythm jointly, makes fast Chinese percussion instrument 13 send the chimes of doom of rapid rhythm, reminds the driver to brake immediately.Preset code can change arbitrarily in the integer range of 0-9, reports to the police with the control that adapts to different distance.

Claims

1, a kind of digital vehicle rearview instrument is characterized in that:

1.1 by the main frame 2 that is contained in the pilothouse optional position, the ultrasonic transducer 3 that is contained in motor vehicle tail is formed,

1.2 comprise in the main frame:

1.2.1 a ultrasonic transmit circuit 43 is launched ultrasound wave by the ultrasonic transducer that is connected on this circuit,

1.2.2 a ultrasound wave receiving circuit 44 receives echo by the ultrasonic transducer that is connected on this circuit,

1.2.3 a range timer 45 is used to produce the range timing signal,

1.2.4 a logic storbing gate 46 provides echoed signal or range to limit signal to digital counter 47,

1.2.5 clock-pulse generator 41, produce synchronizing signal, start ultrasonic transmit circuit 43 emission ultrasound waves and range timer 45 and produce the range timing signal, and make digital counter 47 begin counting, the basic pulse counting that 47 pairs of basic pulse generators of digital counter 42 produce, digital counter 47 stops counting by 46 controls of logic storbing gate

1.2.6 count results by digital counter 47 shows the digital indicator 48 of measured back distance with object,

1.2.7 one is preset 50 digital comparators 51 of judging comparison to digital counter 47 output results and binary-coded decimal,

1.2.8 executive circuit 52 of pointing out according to the result of digital comparator 51.

2, digital vehicle rearview instrument as claimed in claim 1, it is characterized in that: described binary-coded decimal preset 50 certain preset termination and have and carry out " 0 ", the on-off circuit of " 1 " conversion, this on-off circuit is connected into by switch 5, resistance 39, two-way switch 27B, and described switch 5 is connected with the pilothouse reverse lever.

3, digital vehicle rearview instrument as claimed in claim 1 is characterized in that: be connected in the circuit of light sources in executive circuit 52 manually to stop to get out of the way and close 6.