CN2343031Y - Alarm for backing car and preventing collision - Google Patents
Alarm for backing car and preventing collision Download PDFInfo
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- CN2343031Y CN2343031Y CN 98233344 CN98233344U CN2343031Y CN 2343031 Y CN2343031 Y CN 2343031Y CN 98233344 CN98233344 CN 98233344 CN 98233344 U CN98233344 U CN 98233344U CN 2343031 Y CN2343031 Y CN 2343031Y
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Abstract
The utility model relates to an alarm for car backing and collision prevention, comprising an ultrasonic sensor part, a host machine unit and a sound / visual alarm part. The host machine unit is operated by using a single chip microcomputer (CPU) as a main control system. Driving signals with different frequencies are emitted by the main control system via a software analogue method, and a window type integrated operational amplifying voltage comparator and a dynamic scanning frequency are adopted to make the utility model adapt to various different ambient temperature conditions. An emitting head and a receiving head are simultaneously packed in an ultrasonic sensor by the utility model which is compact in volume. A filtering voltage stabilizing circuit with a power supply is adopted by input and output which namely is earthing, and interference rejection ability is effectively enhanced.
Description
The utility model relates to a kind of reversing proximity warner, especially a kind of reversing automobile and proximity warner that utilizes ultrasonic ranging.
The driver in time found the obstacle of back to improve the accuracy and the safety of falling, stopping in when reversing, the minimizing accident be very important.It is the 40KHZ oscillator with dual time-base ic NE556 that utility model ZL95245331.2 discloses a kind of, the tablet machine is a core control and treatment device, with dibit charactron range of a signal, behind car, launch ultrasonic pulse by sonac, record the reversing automobile safety alarm device of the tailstock apart from obstacle distance according to reflection echo.Its shortcoming is to overcome the influence of external temperature to ultrasonic sensor sensibility, i.e. the variation of external temperature can cause the ultrasonic transduter change of resonance frequency.The emission efficiency of ultrasonic transduter also can decrease so, and originally the obstacle that can normally survey just might can't be found out.In addition, it is independent with emitting head that this annunciator receives head, and adjustment difficulty and the low problem of antijamming capability are installed.
The purpose of this utility model is to provide a kind of adaptation various external temperature conditions, reversing small and exquisite, that interference resistance is strong and proximity warner.
The utility model is to realize like this, it comprises the ultrasonic transduter part, main computer unit and sound/light crossing-signal part, ultrasonic transduter partly comprises ultrasonic transduter, ultrasonic transduter emission driving circuit, ultrasonic transduter acceptor circuit and ultrasonic emitting state-feedback circuit, main computer unit is based on single-chip microprocessor (CPU), sound/light crossing-signal part is by three-color LED light, amplification driving circuit, the direct current buzzer phone is formed, CPU is the core of whole alarm system, the running of its control total system, the square wave that produces by software simulation in the ultrasonic transduter emission driving circuit, the direct drive ultrasonic transduter, making system is the single clock system, the dynamic scan frequency is adopted in the hypracoustic emission, has adopted window type integrated transporting discharging voltage comparator in the ultrasonic emitting state-feedback circuit.
The utility model is further improved, and this device is directly plugged on the automobile+the 12V direct supply, is packaged with emitting head simultaneously and receives head in a ultrasonic transduter.
The utility model is further improved, and this device input, output are that ground connection is all adopted the power filter mu balanced circuit.
The utility model produces drive signal by software simulation method, can be according to actual needs, send the drive signal of different frequency, and adopt the software and hardware of window type integrated transporting discharging voltage comparator and the dynamic scan frequency technology that combines, make annunciator adapt to various external temperature condition.In addition, this device is directly plugged on the automobile+the 12V direct supply, in a ultrasonic transduter, be packaged with emitting head simultaneously and receive head, volume is small and exquisite and easy for installation, this device input, output are that ground connection is all adopted the power filter mu balanced circuit, both guaranteed self the device do not disturb other electronic machine, the interference of other consumer also can't seal in this device by power supply, has effectively improved antijamming capability.
Below in conjunction with drawings and Examples the utility model is described in detail.
Fig. 1 is the module map of the utility model;
Fig. 2 is the cpu function module map of the utility model;
Fig. 3 is the ultrasonic transmit circuit figure of the utility model;
Fig. 4 is the super sonic acceptor circuit figure of the utility model:
Fig. 5 is the sound/light drive circuit figure of the utility model;
Fig. 6 is the window type integrated transporting discharging voltage comparator figure of the utility model;
Fig. 7 is power supply input, the output filtering figure of the utility model;
Fig. 8 is the temperature frequency diagram of curves of the utility model;
Fig. 9 is the ultrasonic transduter constructional drawing of the utility model.
As shown in Figure 1, the utility model can be divided into 6 modules altogether by its function.
Function to CPU in the accompanying drawing 2 is described further, and constitutes: 4MHz XT crystal oscillator, and capacitor C 1, C2, reset transistor N1, R1, A, b emission/reception, sound/optical drive are reported to the police, the input of Vcc power supply, Vss ground connection.
In the accompanying drawing 3, the ultrasonic emitting driving circuit constitutes:
Transistor: N1, D1, D2, D3
Resistance: R1, R2, R3, R4, R5, R6
Capacity cell: C1, C2
Inductance element: I1, I2 and voltage transformer E1
Driving voltage N1, E1 through the output of CPU pin amplify, and after the pressure-raising, pass through R5 again, C2, and D2, D3,13,14, R3, R4 sends into ultrasonic transduter after the C1 shaping and drives emission.
Here particularly it is to be noted R6, the effect of I5, as noted earlier, if the last ground connection of hypracoustic does not add any shielding and directly goes here and there ground end, then can disturb the normal operation of other consumer, I5, R6 plays shielding action just, high-frequency harmonic is consumed at I5 as far as possible, on the R6, accomplish the power conditioner effect.In the accompanying drawing 4, circuit is comparatively complicated, the circuit structure.Have:
Transistor: N1, N2, N3
Resistance: R1 ~ R19
Capacity cell: C1 ~ C8
Inductance element: I1
Integrated component: CA324
Ultrasonic transduter converts electric signal to receiving the ultrasonic signal of returning, but this electric signal is must need this signal is carried out filtering, shaping and amplification directly into CPU as final incoming signal.Incoming signal filters the direct current signal of incoming signal through capacitor C 1 back, and N1 carries out doing after one-level is put in advance the input port of the inverse feedback input end of CA324 integrated transporting discharging to this signal.There is individual independently integrated transporting discharging CA324 inside, so can be connected into the inverse feedback integrated transporting discharging comparator of secondary, incoming signal is connected into negative feedback type can brings two benefits: 1. amplification quantity is unlikely to excessive.2. inverse feedback has and follows function automatically, and this point is very important to successfully detecting correct received signal.At first, the signal of reception can cause the power of signal to differ widely owing to the far and near different of distance, but the circuit of negative feedback type can be adjusted to signal certain intensity, guarantees the correctness of signal.
After two-stage integrated transporting discharging comparator, signal can carry out sending into CPU at last after a grade circuit that amplifies amplifies at last and detect mouth, finishes its task.Equally, the effect of I1, R2 be with transmission circuit in I5 play the same effect with R5, specifically can be with reference to the transmission circuit part.
In the accompanying drawing 5: the circuit structure.Have:
Transistor: N1, N2, N3
Resistance: R1, R2, R3, R4, R5, R6
Capacity cell: C1
Buzzer phone and three-color LED light
CPU detects after the effective ultrasonic wave reflected signal, just compares according to this signal value and TO counting machine, and this value can become 4 parts:
1. obstacle outside the dangerous area, is not reported to the police outside 1.4 meters.
2. obstacle is within 1.4 meters, and outside 1 meter, in the dangerous area, the green light buzzer phone of reporting to the police simultaneously pipes with speed comparatively slowly.
3. within 1 meter, outside 0.5 meter, in moderate risk, amber light is played the police, and buzzer phone is reported to the police with fast speeds simultaneously.
4. within 0.5 meter, at this moment in high-risk danger zone, simultaneity factor drives red light, and buzzer phone is rapid simultaneously reports to the police.
The light warning device here adopt the combination lantern alarm lamp promptly combination lantern can send the light of three kinds of different colours by different control methods, the effect of capacitor C 1 is that high-frequency harmonic is filtered out.
In the accompanying drawing 6: window type integrated transporting discharging voltage comparator circuit structure.Have:
Feedback voltage voltage transformer: E1
Crystal stabilivolt: D1, D2
Integrated transporting discharging: A1
Resistance: R1, R2, R3, R4, R5, R6
The drive signal that feedback voltage voltage transformer E1 will be sent to ultrasonic transduter is extracted and is sent to window voltage comparator behind the voltage signal and compares, wherein the U of window comparator
TH1=4.5V, U
TH2=1V, if feedback voltage signal is not to+4.5V window voltage comparator to be overturn with height, then CPU just can judge because current temperature traverse has made the resonant frequency point drift too much, so CPU just must search for resonant frequency point again, D among the figure, D2, R4, D2 prevent that overcurrent or overvoltage two from damaging integrated transporting discharging and design-calculated.
In the accompanying drawing 7: power supply is supplied with and the filter circuit structure.Have:
The crystal stabilivolt: 4007, D1
Integrated regulator spare: 7812,7808,78L05
Resistance: R1, R2
Electric capacity: C1, C2, C3, C4, C5
Inductance: L1
After carrying out the unit design of total system, and then the input power supply that the power supply of main frame is supplied with adopts the power purification circuit, we know, the stability of power supply has important effect to machine system, the driving voltage of ultrasonic transduter very high (being about 120V) and have high order Fourier harmonic wave.If the signal of native system does not add any shielding directly and power supply directly link, not only own system can't normal operation, also can influence the normal operation of other consumer on the automobile, so this clean circuit has the amphicheirality, even the signal of this machine can not seal among other electric equipmenies by power supply.
Its circuit diagram principle is as follows:
Inductance L 1 can be filtered high-frequency harmonic, play every friendship and lead straight effect, 4007 voltage stabilizers can play two effects, and the one, it is unidirectional that power supply is flowed to, and promptly plays diode action, the 2nd, can play pressure stabilization function, treated voltage can be the output of three tunnel different voltages :+12V at last ,+8V, and+5V is to satisfy the different electricity consumption requirements of different components and parts, the driving of right+12V also must be gone up a diode D1 again and be shielded it.
Fig. 9 is the ultrasonic transduter constructional drawing that the utility model adopts.
Ultrasonic transduter is very important in a system link, and its quality is the accuracy of decision systems directly.To automobile product, the index of selection must satisfy following some:
1. integrated level and light;
2. sensitivity and acoustic pressure want high;
3. humidity and temperature there are very strong resistivity, promptly can produce obvious variation owing to the variation of external temperature and humidity;
4. price is low;
5. directive property wants big.
The sensitivity of ultrasonic transduter and antijamming capability are a pair of contradiction, highly sensitive then antijamming capability will reduce, the antijamming capability height, then sensitivity will reduce, as the cost of the sensitivity that how do not reduce or reduce a little to obtain high anti-jamming capacity Here it is characteristics of the present utility model.Some like products of market are to obtain high sensitivity on the basis of sacrificing its antijamming capability.Its means that adopt have:
● increase useful signal detection time, make that more interfering signal is confirmed.
● the signal of feedback is taked excessive amplification.Enlarge its directive property to reduce " dead band "
The consequence that this " highly sensitive " brought is that to external world interfering signal input is powerless.Or reaction is too sensitive.According to our experimental result as can be known:
A. when we beat iron sheet, annunciator just sent " warning ";
B. when we nearby when start a car, motor engine, equally also this thing happens.And this several interference source is to outer appreciiable in reality.
Another makes its amplification deficiency and signal detection time long for obtaining high anti-jamming capacity, causes numerous real feedback signals can not obtain confirming.The consequence that this defect is brought is more serious: at first being that the dead band is excessive, making the object be in " dead band " not report to the police, secondly is for the object that super sonic is had strong absorption power (as people's clothing etc.), owing to a little less than the feedback signal, can't report to the police.It three is can send the phenomenon of disorderly reporting to the police in the very near distance of 0cm ~ 25cm.
At the defect of these two kinds of maximums, the method that the utility model utilizes soft or hard to combine has successfully solved this contradiction.
The hardware that perfect in shape and function has been arranged just can be brought into play the advantage of alerting ability on the software as solid foundation.The front is mentioned, in order to solve this contradiction on sensitivity and the antijamming capability, what we adopted is the method that software and hardware combines, emphasis embodies the characteristics on the software, there have several annunciators to can be rated as on its hardware on the market to be good, shop characteristic is also good, just because of the cooperation of not carrying out on the software, makes its result of use not good.
The technical description that is adopted is as follows: produce the square wave that drives, direct drive ultrasonic transduter by software simulation 1..
This ultrasonic transduter is at resonant frequency 38KHz ~ 42KHz of+80 degrees centigrade to-40 degrees centigrade, and the used high-frequency clock of this and system is not complementary.And, just can save a special oscillator with behind the software generation square wave, and make system become the single clock system from the doubleclocking system, reduced cost, improved reliability.
Produce drive signal by software in addition, can bring a bit that is difficult to accomplish with oscillator, promptly can send the drive signal of different frequency according to actual needs, this is very important improving on the system self-adaption ability, specifically can be with reference to the description of adaptive technique main points.Here need to mention a bit, when super sonic stopped to launch, sensor can not stop emission immediately, and a period of time of can continuing under with surplus energy to vibrate just can stop.This section period is called " remained shock time ", can't transfer detection signal immediately to after so stop emission signal, must time-delay a period of time could detection signal, the concrete remained shock time is decided by the ultrasonic transduter that adopted, this remained shock time just can be found out by field experiment, in order to guarantee correctness, must add the remained shock nargin of remained shock time * 10%.
Owing to have in the remained shock time, this just means that there is distance last " dead band " in system, promptly will lose effectiveness at very near apart from inner sensor.This distance roughly is to eliminate this dead band between 5 ~ 10cm to need the double end phase shift technology.Owing to cost dearly, and programming is complicated, and the Installation and Debugging difficulty is not so temporarily possess in the utility model.2. about disturbance rejection and sensitivity compounding technique
1. dynamic focus technology is taked in the detection of object, improved the scanning accuracy, its technical description is as follows:
Entered a certain dangerous area when having predicted an object, then CPU just notes the condition code in this district, takes scan method based on this district in scanning process subsequently.Emphasis scans the state of this district's object.Be regardless of the scan method of the equality of primary and secondary compared with those, can improve accuracy greatly, this technology resembles the middle focusing of taking pictures very much, so we are called dynamic focus technology.Software description is as follows:
Initial condition: dangerous area: moderate risk district: the ratio of high-risk domain scanning frequency be 1: 2: 3 be that trizonal scanning times is unequal, the dangerous area scanning times is many more more, this meet reality needs.After finding obstacle: the ratio of redistributing sweep rate, the possibility that obstacle occurs has three kinds: one. and have only a district that obstacle is arranged, then the distribution ratio rule has two, the highest its number of times of getting of the priority in the district at obstacle place is 3, distribute number of times according to the hazard level in each district then, its possibility has three kinds: 1: 2: 31: 3: 23: 1: 2 two. and all there is obstacle in two districts, then distribution ratio is 2: 2: 1, and three kinds of possibilities 2: 2: 12: 1: 21: 2: 2 three are promptly arranged. three districts all have obstacle then to distribute the sweep rate ratio at 1: 2: 3.Above analysis all is suitable for concerning any independent probe. 2. multiple sampling technology, we know, most extraneous disturbing pulses are of short duration, ccasuals, discontinuous, seldom might occur on a large scale, big dynamically, strong jamming pulse (this situation will really occur, so any software and hardware method all will lose efficacy) for a long time.So, according to this situation, we take dual to feedback signal or three resample after, just confirm its validity, its antijamming capability can greatly strengthen like this.Adopt after this technology, ran in the past and strike iron sheet, the sort of flase alarm phenomenon that is taken place when engine engine starts has no longer occurred.The discovery obstacle counting machine of removing each dangerous area is zero → scan successively each district whether exist obstacle → which district have obstacle then the counting machine in which district add 1 → once more and scan each district → draw the location obstacle is arranged as twice scanning result, then confirm the validity in this district, then think to cause if the front and back result in this district is inconsistent, then do not confirm its validity by interfering signal.3. distance priority: during reversing, the obstacle behind the car perhaps also more than one or left side sensor and the right sensor detect simultaneously finds that all there is obstacle on both sides, and at this moment CPU must judge, and the nearest point of chosen distance is as alarm set point, in order to avoid disorderly report to the police.Through after the multiple sampling, CPU judges final result, makes this and with which kind of form reports to the police, and judgement must be through two steps: one. to distance the most dangerous of selection in oneself three dangerous area of left road probe, right wing probe is tabulation.Two. the danger range that left road probe and right wing probe are selected is judged, is the anti-attitude of warning with the nearer distance of selection.4. adaptive technique: in current conditions, which type of abominable situation all might take place, from scorching summer to cold ice-cold severe winter, from dry cold air to moistening warm air, from calm, gentle breeze to strong wind, how to guarantee the conformability of annunciator sensitivity, this just needs CPU to have adaptive ability.In these factors, temperature factor has the greatest impact, so must carry out the temperature correction, takes the dynamic scan frequency but not changeless sweep rate, and its sensitivity and external temperature are complementary, and its temperature and sensitivity curve are seen accompanying drawing 8.
We know: for ultrasonic transduter, its equivalent circuit when not connecting electric wire _ Cable be one by resistance R, the circuit that inductance L and capacitor C are connected into.So, can use the phasor method to analyze one by resistance R, the service condition of the circuit that inductance L and capacitor C are connected under sinusoidal stable state.Have by Kirchoff law and each element equation:
F0=(1/2 π) * (LC)
1/2That is to say, under specified criteria, make emission efficiency the highest, then transmitting frequency must satisfy above-mentioned formula also to have only transmitting frequency be f
0The time, reactance=0 promptly is in the series resonance point.So the center transmitting frequency is not to set arbitrarily.The ultrasonic transduter that native system adopted just is preset to before dispatching from the factory by producer that the center transmitting frequency is 40KHz when 25 ℃ of the room temperatures.From the temperature frequency diagram of curves as can be known, along with variation of temperature, its impedance | Z| also increases thereupon, and sensitivity also reduces thereupon.It is the also drift thereupon of center transmitting frequency.If at this moment system still continues with f
0During=40KHz unmodified frequency emission, emission efficiency will descend, and along with temperature traverse strengthens, then efficient can drop to unacceptable degree.Originally the object that can normally survey nowadays can not be perceived, and this is unacceptable.So must readjust transmitting frequency, seek the series resonance point again, to guarantee conformability, the unitarity of system effectiveness.Be that system must have the adaptive ability that changes to external world.The system of accomplishing has adaptive ability must cooperatively interacting of software and hardware.Technical description is as follows: in the ordinary course of things, the time of reversing has only lasting a few minutes, big variation generally can not take place in condition extraneous in this time a few minutes, thus need only be after the native system start reset, and CPU is through just entering the work of search resonance point after the self check.When searching resonance point, later on just according to this frequency drives ultrasonic transduter.No longer again, search for resonance point, can significantly reduce the complexity of software program like this.
Be cost-cutting in addition, the sensor on each road do not taken a sample that only select Lu Wei representative wherein, other each road is a benchmark with the resonance point on this road all.
From temperature one frequency curve chart, we can learn super sonic when resonance point, | the Z| value is minimum, and sensitivity is that driving voltage is the highest.Around this principle, adopt window type integrated transporting discharging voltage comparator can learn the work efficiency of current sonac.
Utilize the sampling voltage transformer that the driving voltage of ultrasonic transduter is sampled, adjust transformer ratio, feedback voltage signal is higher than threshold voltage V when making near resonance point
TH1=4.5V makes the output voltage U of voltage comparator
0Change (because the sensitivity of the voltage comparator of employing positive feed back formula is very high, so need not worry the sensitivity deficiency), make CPU that the number of times that back record generation is interrupted take place to interrupt, if the signal that once sends 20 times makes CPU interrupt more than 16 times, then can think current frequency very near resonance point, thus be that resonant frequency point withdraws from circulation just with this Frequency point, if be lower than 16 times, then current frequency adds that step-length 200Hz continues search, till searching resonance point.When CPU searches 42KHZ when not finding resonance point yet from 38KHz, external temperature overstepped the extreme limit operating temperature-40 ℃ and+80 ℃ are described, at this moment can only select 40KHz to be the operation point.3. the treatment technology during about program out of control system
CPU probably will be out of control under the effect of strong jamming pulse, and just program " flies ", and this phenomenon terms of settlement is had three.
1. hardware " house dog " technology makes program produce a hardware reset operation through the regular hour by " house dog " under situation out of control, carries out the normal operation of program again.
2. in the worst case, program is after out of control, and house dog can't provide hardware reset, at this moment can only take the method for software that it is automatically reset, what adopt is the method for software " trap ", when program was made mistakes, program was just made a forcible entry into default reduction point after " jumping into trap " and " is resetted ", continues normally operation.
3. for avoiding owing to strong jamming causes the sudden change of I/O mouth state or initial condition as interrupting, the sudden change of counting machine etc., every operation a period of time of program is with regard to " refreshing " once.
Claims (4)
1. move backward and proximity warner for one kind, it comprises the ultrasonic transduter part, main computer unit and sound/light crossing-signal part, ultrasonic transduter partly comprises ultrasonic transduter, ultrasonic transduter emission driving circuit, ultrasonic transduter acceptor circuit and ultrasonic emitting state-feedback circuit, main computer unit is based on single-chip microprocessor (CPU), sound/light crossing-signal part is by three-color LED light, amplification driving circuit, the direct current buzzer phone is formed, CPU is the core of whole alarm system, the running of its control total system, it is characterized in that: produce square wave direct drive ultrasonic transduter by software simulation in the ultrasonic transduter emission driving circuit, making system is the single clock system, the dynamic scan frequency is adopted in the hypracoustic emission, adopted window type integrated transporting discharging voltage comparator in the ultrasonic emitting state-feedback circuit, in a ultrasonic transduter, be packaged with emitting head simultaneously and receive head, this device is directly plugged on the automobile+the 12V direct supply, input, output is that ground connection is all adopted the power filter mu balanced circuit.
2. reversing according to claim 1 and proximity warner is characterized in that: window type integrated transporting discharging voltage comparator circuit is configured with:
Feedback voltage voltage transformer: E1
Crystal stabilivolt: D1, D2
Integrated transporting discharging: A1
Resistance: R1, R2, R3, R4, R5, R6
The drive signal that feedback voltage voltage transformer E1 will be sent to ultrasonic transduter is extracted and is sent to window voltage comparator behind the voltage signal and compares, wherein the U of window comparator
TH1=4.5V, U
TH2=1V, if feedback voltage signal is not to+4.5V window voltage comparator to be overturn with height, then CPU just can judge because current temperature traverse has made the resonant frequency point drift too much, so CPU just must search for resonant frequency point again, D among the figure, D2, R4, D2 prevent that overcurrent or overvoltage from damaging integrated transporting discharging.
3. reversing according to claim 1 and proximity warner, it is characterized in that: main computer unit comprises single-chip microprocessor (CPU), quartz-crystal unit, reset circuit and electric source filter circuit, CPU is by 4MHz XT crystal oscillator, capacitor C 1, C2, reset transistor N1, R1, A, b emission/reception, sound/optical drive are reported to the police, the input of Vcc power supply, and Vss ground connection constitutes.
4. reversing according to claim 1 and proximity warner is characterized in that: power supply is supplied with and filter circuit comprises
The crystal stabilivolt: 4007, D1
Integrated regulator spare: 7812,7808,78L05
Resistance: R1, R2
Electric capacity: C1, C2, C3, C4, C5
Inductance: L1
Inductance L 1 is filtered high-frequency harmonic in the circuit, play every friendship and lead straight effect, it is unidirectional that 4007 voltage stabilizers flow to power supply, promptly play diode action, can play pressure stabilization function in addition, treated voltage is the output of two tunnel different voltages :+12V at last, + 8V, + 5V is to satisfy the different electricity consumption requirements of different components and parts, and the driving of right+12V shields with a diode D1 again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98233344 CN2343031Y (en) | 1998-12-04 | 1998-12-04 | Alarm for backing car and preventing collision |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98233344 CN2343031Y (en) | 1998-12-04 | 1998-12-04 | Alarm for backing car and preventing collision |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2343031Y true CN2343031Y (en) | 1999-10-13 |
Family
ID=33982108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98233344 Expired - Fee Related CN2343031Y (en) | 1998-12-04 | 1998-12-04 | Alarm for backing car and preventing collision |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2343031Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102485535A (en) * | 2010-12-03 | 2012-06-06 | 北京汽车研究总院有限公司 | Auxiliary device for backing |
| CN106990407A (en) * | 2017-02-24 | 2017-07-28 | 联创汽车电子有限公司 | Anti-collision alarm system ultrasonic blind zone processing method and anti-collision alarm system |
| CN111133332A (en) * | 2017-09-29 | 2020-05-08 | 传感器技术有限公司 | Ultrasonic sensor drive device for improving temperature reliability |
-
1998
- 1998-12-04 CN CN 98233344 patent/CN2343031Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102485535A (en) * | 2010-12-03 | 2012-06-06 | 北京汽车研究总院有限公司 | Auxiliary device for backing |
| CN106990407A (en) * | 2017-02-24 | 2017-07-28 | 联创汽车电子有限公司 | Anti-collision alarm system ultrasonic blind zone processing method and anti-collision alarm system |
| CN111133332A (en) * | 2017-09-29 | 2020-05-08 | 传感器技术有限公司 | Ultrasonic sensor drive device for improving temperature reliability |
| CN111133332B (en) * | 2017-09-29 | 2024-03-12 | 传感器技术有限公司 | Ultrasonic sensor driving device for improving temperature reliability |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |