CN201075129Y - Two-wire tri-state parking auxiliary device - Google Patents
Two-wire tri-state parking auxiliary device Download PDFInfo
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- CN201075129Y CN201075129Y CNU2007200074922U CN200720007492U CN201075129Y CN 201075129 Y CN201075129 Y CN 201075129Y CN U2007200074922 U CNU2007200074922 U CN U2007200074922U CN 200720007492 U CN200720007492 U CN 200720007492U CN 201075129 Y CN201075129 Y CN 201075129Y
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Abstract
The utility model provides a two-line three-state parking auxiliary device, relating to a positioning or existing detection system which utilizes ultrasonic reflection. The utility model provides the two-line three-state parking auxiliary device which adopts two-line three-state full digital transmission design proposal and solves the contradiction of low cost and high stability in parking auxiliary system. The utility model is provided with a host machine, a sensor and a transmission line; the host machine is provided with a sensor feeding circuit, a host machine emitting circuit, a singlechip, a three-state level extracting circuit and an echo processing circuit. The sensor is provided with a power supply circuit, a receiving signal isolation circuit, an emitting driving circuit, a piezoelectric ceramic sensor, a receiving amplifying circuit, a digital signal converting circuit and a three-state signal driving circuit; the transmission line is commonly used by the feeding line between the host machine and the sensor and the communication signal line between the host machine and the sensor.
Description
Technical field
The utility model relates to and a kind ofly utilizes the location of ultrasonic reflections or have detection system, especially relates to a kind of parking assist apparatus that adopts the two-line three-state digital communication.
Background technology
Automobile is to launch ultrasonic signal by had the bifunctional ultrasonic sensor of transmitting-receiving by host computer control with the ultrasound wave parking assisting system, and receives the same frequency ultrasonic signal that is reflected by the barrier of automobile back or front.The mistiming that main frame is sent out and receives by the judgement ultrasound wave is judged the obstacle distance of motor vehicle environment, and main frame is reminded human pilot by modes such as audible alarm or distance display, plays the purpose that auxiliary security is driven.
The ultrasound wave parking assisting system is generally formed (referring to Fig. 1) by one group of sensor 1, main frame 2, audible alarm unit 3, distance display unit 4 and power supply and automobile interface 5 parts such as (various buses or data line are connected).Wherein distance display unit 4 is optionally, does not establish the distance display unit in some simple system.The number of sensor 1 is variant for different systems, at least 2 of general requirements.Number of sensors is many more, and system performance is more superior, and the blind area is few more.
Sensor all requires cloth in the vehicle body of the automobile outside, and generally on the bumper bar of front and back, and main frame is located at interior of body.Because number of sensors often and is relatively disperseed, the signal of sensor and main frame transmits and the power feed more complicated that can become like this.Present ubiquitous design proposal has following several:
1) directly connects
Concrete mode be in sensor without any electronic circuit, have only piezoelectric ceramic piece, all ultrasonic transmit circuits and receiving circuit are all in main frame inside, shielding line is adopted in being connected of main frame and sensor.Its advantage is that system design is simple; Its shortcoming is because the ultrasonic signal that returns of sensor is very weak, though used shielding line still to be easy to be interfered, system stability, consistance are bad.
2) four-wire system
Concrete mode is to increase ultrasonic emitting and receive amplifying circuit in sensor.Adopt power supply, ground wire, main frame to sensor signal lines, sensor adopts plain conductor to connect to the connected mode of 4 lines of host signal line.Its advantage is that system's interference free performance improves, and shortcoming is to adopt wire harness too much, and wiring is complicated, and cost increases.
3) three-wire system
Concrete mode is to have done improvement on the basis of four-wire system, and main frame is merged into single line to sensor and sensor to two lines of main frame.Its advantage is to have simplified wire harness than four-wire system.But, two kinds of implementations are arranged because data line is two-way.A kind of mode is to increase MCU to realize in sensor, brings cost to increase; Another kind of mode is that the sensor echoed signal adopts analog signal transmission, is disturbed easily, and system stability is poor.
4) two-wire system
Concrete mode is power lead and the shared line of data line on the basis of three-wire system.Its advantage is that the car load wire harness is fairly simple.The sensor echoed signal adopts analog transmission, and system's interference free performance is relatively poor.
This shows that all there are some defectives in above-mentioned existing design proposal at aspects such as system stability or costs.Low-cost and high stability is the design object that Automobile Electronic Industry is pursued always.
The existing many reports of device such as relevant reversing automobile or the warning of parking, distance display.
A kind of vehicle backing warning system is provided in the application for a patent for invention of publication number for CN1598614, this system uses and is installed in the reference voltage module built-in able to programme that CPU inside can produce various reference voltage values according to the loading routine constant value, detects the barrier that needs alarm fully and accurately detects the barrier that need not alarm.
Provide a kind of reversing radar of vehicle in the application for a patent for invention of publication number for CN1818714, comprise main control system, one or more probe, main frame comprises power supply stabilization circuit, in the main frame, center processor connects ultrasound emission circuit and ultrasonic receiving circuit, every road ultrasound emission circuit comprises the converter that transmits, the amplifier that transmits, with the emission superimposer that the A of transmission line end is connected, ultrasonic receiving circuit comprises electronic switch and Echo Processing circuit.Radar for backing car also comprises sensor module, it comprises the emission separation vessel and the stepup transformer that transmits, the B end of transmission line connects the emission separation vessel, and probe connects the stepup transformer that transmits, also comprise echo superimposer and echo frequency-selecting prime amplifier, ultrasonic receiving circuit comprises the echo separation circuit that is connected between transmission line A end and the electronic switch.
Notification number provides a kind of radar installations of active reversing automobile for the utility model patent of CN2202678, by power circuit, pre-amplification circuit, filtering and oscillator amplifier circuit, emitter following and amplitude limiter circuit, phase-locked loop circuit, central authorities' control section and auxiliary, warning circuit, ultrasound wave takes place and power driving circuit, analog switching circuit, booster circuit and form from gain control circuit, it adopts the central cpu control of high integration, reflection and the reflection wave of finishing ultrasonic signal with 1 ultrasonic sensor detect, by calculating reflection wave definite obstacle distance time of arrival.
Summary of the invention
The purpose of this utility model be for solve above-mentioned existing design proposal at aspects such as system stability or costs more existing defectives, the shortcoming of interference free performance difference when overcoming the complicated and analog signal transmission of multiple-way system wire harness in the existing system, provide a kind of contradiction that solves in the parking assisting system low-cost and high stability, the two-line three-state parking servicing unit of the digital transmission design proposal of employing two-line three-state.
The technical solution of the utility model is that the power lead and the connection of sensor adopts the multiplexing shared common transmission line of mode, come to two lines with ground wire, data communication method adopts ternary numerical coding mode, represents the feed attitude, receives 3 kinds of different states of attitude and control state with noble potential, 3 kinds of different potentials of middle current potential and electronegative potential respectively.
Described 3 kinds of different potentials are:
1. noble potential: the expression main frame is called the feed attitude to the sensor feed.
2. middle current potential: the signal that the expression sensor receives returns to main frame, is called the reception attitude.
3. electronegative potential: expression host computer control sensor emission ultrasound wave is called control state.
The utility model is provided with main frame, sensor and transmission line.
Main frame is used to control the ultrasound wave of sensor emission characteristic frequency, the echo of processes sensor, the distance of disturbance in judgement thing.
Main frame is provided with control and receiving unit and audible alarm part, and control is provided with sensor feed circuit, main frame radiating circuit, single-chip microcomputer, ternary level extraction circuit and Echo Processing circuit with receiving unit.The input end of main frame radiating circuit connects single-chip microcomputer, the output terminal of main frame radiating circuit extracts circuit with ternary level respectively and is connected with the sensor feed circuit, the output terminal of main frame radiating circuit is connected with sensor by signal wire, the output terminal that ternary level extracts circuit takes back the input end of ripple treatment circuit, and the output terminal of Echo Processing circuit connects single-chip microcomputer.
Sensor is launched ultrasound wave under host computer control, and becomes ternary digital signal to return to main frame through the sensor internal processing of circuit ultrasound wave that receives.
Sensor is provided with power circuit, receiving and transmitting signal buffer circuit, emission driving circuit, piezoceramic transducer, reception amplifying circuit, digital signal change-over circuit and ternary signal driving circuit.The input end of power circuit is connected with the input end of receiving and transmitting signal buffer circuit and the output terminal of ternary signal driving circuit respectively, the input end of power circuit is connected with main frame by signal wire, the output terminal of receiving and transmitting signal buffer circuit is connected with the input end of emission driving circuit, the output terminal of emission driving circuit is connected with piezoceramic transducer, the output termination of piezoceramic transducer receives the input end of amplifying circuit, receive the input end of the output termination digital signal change-over circuit of amplifying circuit, the input end of the output termination ternary signal driving circuit of digital signal change-over circuit.
Main frame adopts the multiplexing shared transmission line of mode to the signal wire of communication between feed line, main frame and the sensor of sensor, comes to 2 lines with ground wire.Transmission signals adopts ternary digitally encoded signal on the signal wire, and ternary digitally encoded signal is represented the feed attitude, received 3 kinds of different states of attitude and control state with noble potential, 3 kinds of different potentials of middle current potential and electronegative potential respectively.Noble potential is represented main frame to the sensor feed, is the feed attitude; Middle current potential represents that the signal that sensor receives returns to main frame, is to receive attitude; Electronegative potential is represented host computer control sensor emission ultrasound wave, is control state.Approaching constant by sensor to the voltage amplitude of the echoed signal of main frame, can not change along with the distance of barrier.
Described main frame can be provided with distance display circuit and communication device.
Compare with existing parking assisting system, the utlity model has following outstanding advantage.
1. echoed signal voltage amplitude substantially constant (for example 1V), the distance with barrier does not change.
2. sensor is connected two connecting lines of employing with main frame, and system connects simple, and cost is low.
3. ternary digital transmission, system's strong interference immunity are adopted in each parts transmission between system.
Description of drawings
Fig. 1 is existing car parking accessory system structured flowchart.
Fig. 2 is the circuit composition frame chart of the utility model embodiment.
Fig. 3 is the voltage waveform view on the signal wire of the utility model embodiment.
Fig. 4 uses the example composition frame chart for the utility model embodiment adopts 4 sensor strip bus communications.
Fig. 5 is the virtual voltage oscillogram of Fig. 4.
Fig. 6 is that the circuit of the utility model embodiment is formed schematic diagram.
Embodiment
Following examples will be further described the utility model in conjunction with the accompanying drawings.
Referring to Fig. 2, the utility model is provided with main frame 101, sensor 102 and transmission line 103.
Shared 1 transmission line 103 of the signal wire of the power lead of sensor 102 and connection and main frame 101, main frame 101 provides working power for sensor 102 by signal wire (being transmission line 103).
In the feed attitude, main frame continues to be noble potential on the transmission line to the sensor power supply by feed circuit.
In control state, main frame output electronegative potential control sensor emission ultrasound wave is electronegative potential on the transmission line.
Receiving attitude, sensor output intermediate potential is given main frame, and the expression sensor has the ultrasonic signal of the reflection of receiving, and is middle current potential on the transmission line.
Referring to Fig. 2 and 3, reception and radiating circuit are distributed in main frame and the sensor, are connected two parts circuit by transmission line 103 with ground wire 104, and transmission line 103 is power lead, also is data communication line (being signal wire).Single-chip microcomputer 113 output emissioning controling signals, this signal converts control state to by main frame radiating circuit 112, and promptly the voltage on the transmission line is less than V2 (referring to Fig. 3).This voltage signal is transferred to sensor by transmission line 103, receiving and transmitting signal buffer circuit 124 extracts the ultrasonic emitting control signal, trigger emission driving circuit 125 and drive outwards transmission ultrasound wave of piezoceramic transducer 128, having finished slave controller is that single-chip microcomputer 113 sends the process of emission control orders to sensor emission.
When not having data-signal on the signal wire (being transmission line 103), be in feed condition.Feed circuit 111 provides power supply to sensor.
Fig. 3 provides the voltage waveform on the signal wire of the utility model embodiment, and noble potential, middle current potential and 3 kinds of different potentials of electronegative potential are:
1. noble potential A: when voltage greater than V
1The time, the expression main frame is called the feed attitude to the sensor feed.
2. middle current potential B: when voltage at V
1With V
2Between, the signal that the expression sensor receives returns to main frame, is called the reception attitude.
3. electronegative potential C: when voltage less than V
2The time, expression host computer control sensor emission ultrasound wave is called control state.
In Fig. 3, earth potential is D.
Fig. 4 provides one and is with 4 sensors, and the wiring diagram of a parking system of CAN bus is adopted in system and car load communication, owing to adopted two-wire system, has simplified the wiring of system.System is made up of the main frame that includes the sounding parts 201,4 sensors 202,203,204,205 and system's wire harness 206.System power supply provides power supply by power positive end 221 and power supply negative terminal 222, and CAN connection 231,232 is used for and the car load data communication.Sensor signal lines 211,212,213,214 is responsible for main frame and sensor signal transmission and probe power to be provided.After linking together, 4 sensor ground wires are connected to main frame inside by 1 line.
The real work waveform of Fig. 4 is referring to the waveform 301 of Fig. 5.When voltage during, be in the feed attitude, as the waveform among Fig. 5 313 greater than threshold voltage 321.When voltage is between thresholding 321 and 322, be in the reception attitude, as the waveform among Fig. 5 312 and 314.When voltage is lower than thresholding 322, be in control state, as the waveform among Fig. 5 311.
Because the characteristic of piezoelectric ceramic ultrasound sensor, also there are faint mechanical vibration in piezoelectric ceramic piece after having launched ultrasonic signal, and this vibration also can think to receive ultrasonic signal, claims that this is the sensor aftershock.Waveform 312 is exactly the aftershock behind the sensor emission ultrasonic signal.
L＝vt/2
In the formula, L is the distance of barrier from sensor, and v is the speed that ultrasound wave is propagated in air, and t launches ultrasound wave to the mistiming that receives reflection wave, is exactly 311 and 314 mistiming.
Fig. 6 provides an application example, the sensor passage that in Fig. 6, only draws, and other channel types are seemingly.
In the main control system circuit, resistance R 4 is as feed circuit 111, and resistance R 2 is formed main frame radiating circuit 112 with R3 and triode Q1.Ternary level extracts circuit 114 and is made up of comparer U1A and other peripheral components.Resistance R 7 is formed bleeder circuit with R8 and capacitor C 1, produces the reference voltage level that ternary level extracts circuit 114.Echo Processing circuit 115 is made up of resistance R 1 and capacitor C 11.
Diode D1 and capacitor C 4 constitute sensor electrical source circuit 122 with C5 in the sensor.Signal transmitting and receiving buffer circuit 124 adopts voltage stabilizing diode ZD1 to realize, triode Q3, and middle all transformer T1, resistance R 12, R16, R19 and capacitor C 10 constitute emission driving circuit 125.Amplifier U2A and feedback resistance R17 and peripheral circuit constitute reception amplifying circuit 127.Amplifier U2B, resistance R 11 constitute digital signal change-over circuit 126 with R13 and capacitor C 6.Triode Q2 and resistance R 9 constitute ternary signal driving circuit 123.The voltage that receives echo is obtained by feed resistance R4 in the main frame and 9 dividing potential drops of the resistance R in the sensor.
When needs emission ultrasound wave, the square-wave signal of single-chip microcomputer output fixed frequency drives triode.When single-chip microcomputer output high level, triode Q1 conducting is in low level on the transmission line, be control state; When the single-chip microcomputer output low level, triode Q1 ends, and is in high level on the transmission line, is control state, obtains waveform 311 as shown in Figure 5 on the transmission line, and this waveform is an emissioning controling signal.(control state) drives triode Q3 conducting by ZD1 and R16 when being low level on the transmission line, and VCC charges to C10; (feed attitude) triode Q3 ends when being high level on the transmission line, and capacitor C 10 is by resistance R 19 discharges.The primary coil of the charging and discharging currents of C10 by middle all transformers, this signal is through transformer rear drive ultrasonic sensor emission ultrasound wave that boosts.
When receiving the ultrasound wave that reflects, ultrasonic sensor produces faint electric signal, and this electric signal converts digital signal to digital signal change-over circuit 126 through receiving after amplifying circuit 127 amplifies.When digital signal is high level, drive triode Q2 conducting by resistance R 10 ,+12V supply voltage arrives ground through R4, R9 and Q2.Voltage on the transmission line is the medium voltage that R4 and R9 dividing potential drop obtain, for receiving attitude.When digital signal was low level, triode Q2 ended, and was that high voltage is the feed attitude on the transmission line.Obtain on the transmission line as the waveform among Fig. 5 314, this waveform is to receive the waveform of ultrasonic echo signal on transmission line.This signal waveform is extracted circuit through ternary level and is taken out echoed signal, send the single-chip microcomputer input port after the shaping of Echo Processing circuit.Single-chip microcomputer reflects the distance of hyperacoustic mistiming dyscalculia thing from sensor by judging the emission ultrasound wave and receiving.
The reference model of the main components and parts among Fig. 6 and referential data are referring to table 1.
Table 1
| Numbering | With reference to model or reference parameter | Numbering | With reference to model or reference parameter |
| R1 | Resistance 10K ohm | R20 | Resistance 1K ohm |
| R2 | Resistance 4.7K ohm | C1 | Ceramic condenser 10nF |
| R3 | Resistance 4.7K ohm | C2 | Ceramic condenser 10nF |
| R4 | 470 ohm of resistance | C3 | Ceramic condenser 10nF |
| R5 | Resistance 10K ohm | C4 | Alminium electrolytic condenser 470uF |
| R6 | Resistance 10K ohm | C5 | Ceramic condenser 100nF |
| R7 | Resistance 15K ohm | C6 | Ceramic condenser 10nF |
| R8 | Resistance 10K ohm | C7 | Ceramic condenser 10nF |
| R9 | 470 ohm of resistance | C8 | Ceramic condenser 10nF |
| R10 | Resistance 4.7K ohm | C9 | Ceramic condenser 1nF |
| R11 | Resistance 20K ohm | C10 | Ceramic condenser 150nF |
| R12 | Resistance 4.7K ohm | C11 | Ceramic condenser 10nF |
| R13 | Resistance 22K ohm | Q1 | PNP triode 2SC1623 |
| R14 | Resistance 20K ohm | Q2 | PNP triode 2SC1623 |
| R15 | Resistance 20K ohm | Q3 | NPN triode 2SA1162 |
| R16 | Resistance 1K ohm | U1 | Comparer LM2903 |
| R17 | Resistance 1M ohm | U2 | Amplifier OP292 |
| R18 | Resistance 1K ohm | ZD1 | The 7V stabilivolt |
| R19 | 100 ohm of resistance | T1 | 1: 40 step-up transformer |
Claims (6)
1. the two-line three-state parking servicing unit is characterized in that being provided with main frame, sensor and transmission line;
Main frame is used to control the ultrasound wave of sensor emission characteristic frequency, the echo of processes sensor, the distance of disturbance in judgement thing; Main frame is provided with sensor feed circuit, main frame radiating circuit, single-chip microcomputer, ternary level extraction circuit and Echo Processing circuit, the input end of machine radiating circuit connects single-chip microcomputer, the output terminal of main frame radiating circuit extracts circuit with ternary level respectively and is connected with the sensor feed circuit, the output terminal of main frame radiating circuit is connected with sensor by signal wire, the output terminal that ternary level extracts circuit takes back the input end of ripple treatment circuit, and the output terminal of Echo Processing circuit connects single-chip microcomputer; Sensor is used for launching ultrasound wave under host computer control, becomes ternary digital signal to return to main frame through the sensor internal processing of circuit ultrasound wave that receives;
Sensor is provided with power circuit, the receiving and transmitting signal buffer circuit, the emission driving circuit, piezoceramic transducer, receive amplifying circuit, digital signal change-over circuit and ternary signal driving circuit, the input end of power circuit is connected with the input end of receiving and transmitting signal buffer circuit and the output terminal of ternary signal driving circuit respectively, the input end of power circuit is connected with main frame by signal wire, the output terminal of receiving and transmitting signal buffer circuit is connected with the input end of emission driving circuit, the output terminal of emission driving circuit is connected with piezoceramic transducer, the output termination of piezoceramic transducer receives the input end of amplifying circuit, receive the input end of the output termination digital signal change-over circuit of amplifying circuit, the input end of the output termination ternary signal driving circuit of digital signal change-over circuit;
Main frame is to the shared transmission line of the signal wire of communication between feed line, main frame and the sensor of sensor.
2. two-line three-state parking servicing unit as claimed in claim 1 is characterized in that main frame adopts the multiplexing shared transmission line of mode to the signal wire of communication between feed line, main frame and the sensor of sensor, comes to 2 lines with ground wire.
3. two-line three-state parking servicing unit as claimed in claim 1 is characterized in that transmission signals adopts ternary digitally encoded signal on the signal wire.
4. two-line three-state parking servicing unit as claimed in claim 3 is characterized in that described ternary digitally encoded signal represents the feed attitude, receives 3 kinds of different states of attitude and control state with noble potential, 3 kinds of different potentials of middle current potential and electronegative potential respectively.
5. two-line three-state parking servicing unit as claimed in claim 4 is characterized in that described noble potential represents main frame to the sensor feed, is the feed attitude; Middle current potential represents that the signal that sensor receives returns to main frame, is to receive attitude; Electronegative potential is represented host computer control sensor emission ultrasound wave, is control state.
6. two-line three-state parking servicing unit as claimed in claim 1 is characterized in that described main frame is provided with distance display circuit and communication device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200074922U CN201075129Y (en) | 2007-06-29 | 2007-06-29 | Two-wire tri-state parking auxiliary device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200074922U CN201075129Y (en) | 2007-06-29 | 2007-06-29 | Two-wire tri-state parking auxiliary device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201075129Y true CN201075129Y (en) | 2008-06-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200074922U Expired - Lifetime CN201075129Y (en) | 2007-06-29 | 2007-06-29 | Two-wire tri-state parking auxiliary device |
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| Country | Link |
|---|---|
| CN (1) | CN201075129Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100561253C (en) * | 2007-06-29 | 2009-11-18 | 厦门吉致电子有限公司 | Two-line three-state parking assistant system |
-
2007
- 2007-06-29 CN CNU2007200074922U patent/CN201075129Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100561253C (en) * | 2007-06-29 | 2009-11-18 | 厦门吉致电子有限公司 | Two-line three-state parking assistant system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20070629 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |