CN101866004B - Car parking accessory system having volt-limited radar sensor - Google Patents
Car parking accessory system having volt-limited radar sensor Download PDFInfo
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- CN101866004B CN101866004B CN2010102150594A CN201010215059A CN101866004B CN 101866004 B CN101866004 B CN 101866004B CN 2010102150594 A CN2010102150594 A CN 2010102150594A CN 201010215059 A CN201010215059 A CN 201010215059A CN 101866004 B CN101866004 B CN 101866004B
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Abstract
The invention discloses a car parking accessory system having a volt-limited radar sensor, which comprises a host computer and a radar sensor. The radar sensor comprises a power supply circuit, an amplification circuit, an amplification control circuit and a piezoelectric ceramic sensor, a comparison circuit, an emitter driving circuit and a collector amplification output driving circuit. The collector amplification output of the collector amplification output driving circuit ensures that the signal output to the host company has a volt limiting function and can ensure useful signal output amplitude. The host computer need not amplify the signal so the cost of system can be lowered. A signal on a communication wire has enough strength so the capacity of resisting disturbance of the communication wire is enhanced, the stability is high and the assembly is convenient. The invention solves the problems of the prior art that the system stability is inferior and the cost is high, overcomes the defects that the multi-wire system has complex wires and the capacity of resisting disturbance is inferior when an analog signal is transmitted. Besides, the cost is low and the stability is high.
Description
Technical field the present invention relates to a kind of car parking accessory system, particularly a kind of car parking accessory system with volt-limited radar sensor.
Background technology is in order to remind the vehicle drive personnel, generally through mode driver assistance personnel such as audible alarm or distance display, to reach the purpose of safe driving.Existing ultrasound wave parking assisting system generally is made up of sensor, main frame, audible alarm unit, distance display unit, power circuit and automobile interface etc.Wherein require sensor to be laid in outside the vehicle body of automobile, for example on the bumper bar of front and back or on the vehicle body of side.Main frame then is located in the car.Because the sensor number of using is more; And relatively disperse; Therefore transmission of the signal of sensor and main frame and power feed are very complicated; The technical scheme that adopts at present mainly contains direct connection, four-wire system, three-wire system and two-wire system, but the ubiquity system stability is relatively poor and cost than problems such as height.
Publication number is in the application for a patent for invention of CN1818714 a kind of reversing radar of vehicle to be provided; Comprise main control system, one or more probe; Main frame comprises power supply stabilization circuit, and 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 transmits stepup transformer; The B end of transmission line connects the emission separation vessel; And probe connects the stepup transformer that transmits, and also comprises echo superimposer and echo frequency-selecting prime amplifier, and ultrasonic receiving circuit comprises the echo separation circuit that is connected between transmission line A end and the electronic switch.This circuit can't carry out trigonometric function and calculate, and the EMC ability, and cost is high.
Publication number is the two-line three-state parking assistant system of CN101078766, relates to a kind ofly utilizing the location of ultrasonic reflections or having detection system.A kind of contradiction low-cost and high stability, two-line three-state parking assistant system of the digital transmission design proposal of employing two-line three-state of solving in the parking assisting system is provided.Be provided with main frame, sensor and transmission line; Main frame is provided with sensor feed circuit, main frame radiating circuit, single-chip microcomputer, ternary level extraction circuit and Echo Processing circuit.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, and main frame is to the shared transmission line of the signal wire of communication between feed line, main frame and the sensor of sensor.This system should export and not be envelope output, so EMI is higher, and cost is high.
Summary of the invention the object of the invention is exactly the deficiency to prior art, provides a kind of
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
A kind of car parking accessory system with volt-limited radar sensor; Comprise main frame, reach sensor; Radar sensor comprises power circuit, amplifying circuit, the big circuit of folding and unfolding, piezoceramic transducer, it is characterized in that: said radar sensor also is provided with comparison, emitter-base bandgap grading input driving circuit and collector and amplifies output driving circuit;
The input end of power circuit is connected with the communicating circuit of main frame through signal wire, and the output terminal of power circuit is connected with the input end of comparison, emitter-base bandgap grading input driving circuit; The output terminal of comparison, emitter-base bandgap grading input driving circuit is connected with the input end of amplifying circuit; The output terminal of amplifying circuit is connected with the input end of piezoceramic transducer; The output terminal of piezoceramic transducer is connected with the input end that receives amplifying circuit; The output terminal that receives amplifying circuit is connected with the input end that collector amplifies output driving circuit; The output terminal that collector amplifies output driving circuit is connected with the communicating circuit of main frame.
Above power circuit, amplifying circuit, the big circuit of folding and unfolding, piezoceramic transducer, comparison, emitter-base bandgap grading input driving circuit, collector amplify output driving circuit and constitute volt-limited radar sensor jointly.The collector that collector amplifies output driving circuit amplifies output, can make the signal that outputs on the main frame have limited volt effect, can also guarantee useful signal output amplitude simultaneously.
Technical scheme of the present invention is to adopt the two-wire system ultrasonic ranging sensor of grade input mode work of penetrating and export envelope signal with the limit volt.
The present invention is provided with comparator circuit, emitter-base bandgap grading input driving circuit and collector amplified output signals driving circuit in the ultrasonic ranging sensor.
In the present invention, can adopt 4 radar sensors, be separately positioned on automobile all around, each radar sensor all is connected with main frame and receives in the automobile power supply.
Preferably, what said collector amplified output driving circuit output is the envelope signal that pressure limiting output is arranged, and the envelope signal of output is set with high-amplitude, the high-amplitude≤4V of said output envelope signal; Said radar sensor output to be connected the host communication line on the amplitude>=0.7V of envelope signal.Collector amplifies the envelope signal that the output driving circuit output device has pressure limiting, guarantees the amplitude of useful signal output, makes main frame on processing signals, need not do very big processing and amplifying, therefore can reduce system cost.Signal on the order wire has enough intensity simultaneously, has strengthened the antijamming capability on order wire, and therefore stability is high.
Further preferred, said comparison, emitter-base bandgap grading input driving circuit comprise resistance R 2, R4, R7, R6, triode Q1, Q2, diode D1A; The emitter of triode Q1 is connected with power circuit, and the collector of triode Q1 is connected with amplifying circuit, and the base stage of triode Q1 is connected with the collector of triode Q2 through resistance R 6; Resistance R 4 is connected across between the emitter and base stage of triode Q1; Resistance R 2 is connected across between the emitter of base stage and triode Q1 of triode Q2; The emitter of triode Q2 is connected with the communicating circuit of main frame with signal wire through diode D1A.
Further preferred, said collector amplifies output driving circuit and comprises resistance R 13, R5, triode Q4, and capacitor C 8, the collector of triode Q4 is connected with resistance R 5, and resistance R 5 is connected with the communicating circuit of main frame; It is envelope signal to the signal of the communicating circuit transmission of main frame that said collector amplifies output driving circuit.
Compare with existing parking assisting system, the present invention has following outstanding advantage:
In the driving of sensor internal, be provided with the emitter-base bandgap grading input driving circuit; The emitter-base bandgap grading input driving circuit can carry out collector and amplify output; Make the signal that outputs on the main frame produce a limit volt, but can guarantee the amplitude of useful signal output simultaneously, amplify output owing to be provided with collector; So main frame need not done very big processing and amplifying on processing signals, therefore can reduce system cost.Signal on the order wire has enough intensity, has strengthened the antijamming capability on order wire, and therefore stability is high.Install more convenient.Traditional circuit all drives with the base stage input.
A kind of beneficial effect with car parking accessory system of volt-limited radar sensor of the present invention is; Solved in the existing design proposal the relatively poor and cost of existing system stability than problems such as height; Overcome the complicated shortcoming of interference free performance difference during with analog signal transmission of multiple-way system wire harness in the existing system, solved the contradiction of low-cost and high stability in the parking assisting system.
Description of drawings Fig. 1 is a circuit structure block diagram of the present invention;
Fig. 2 adopts 4 ultrasonic ranging sensor application example composition frame charts for the embodiment of the invention;
Fig. 3 is circuit theory diagrams of the present invention;
Fig. 4 is a signal of communication synoptic diagram of the present invention.
Embodiment is further described the present invention below in conjunction with accompanying drawing, but does not therefore limit the present invention among the described scope of embodiments.
Referring to Fig. 1; A kind of car parking accessory system with volt-limited radar sensor; Comprise main frame 1, radar sensor 11; Radar sensor 11 comprises the big circuit of power circuit 111, amplifying circuit 114, folding and unfolding 116, piezoceramic transducer 117, and it is characterized in that: said radar sensor 11 also is provided with comparison, emitter-base bandgap grading input driving circuit 113 and collector and amplifies output driving circuit 115; Power circuit 111, emitter-base bandgap grading input driving circuit 113, amplifying circuit 114, comparison, collector amplify output driving circuit 115, the big circuit 116 of folding and unfolding, piezoceramic transducer 117 constitutes volt-limited radar sensor.
Referring to Fig. 1, Fig. 3, the input end of power circuit 111 is connected with the communicating circuit of main frame 1 through signal wire, and the output terminal of power circuit 111 is connected with the input end of comparison, emitter-base bandgap grading input driving circuit 113; The output terminal of comparison, emitter-base bandgap grading input driving circuit 113 is connected with the input end of amplifying circuit 114; The output terminal of amplifying circuit 114 is connected with the input end of piezoceramic transducer 117; The output terminal of piezoceramic transducer 117 is connected with the input end that receives amplifying circuit 116; The output terminal that receives amplifying circuit 116 is connected with the input end that collector amplifies output driving circuit 115; The output terminal that collector amplifies output driving circuit 115 is connected with the communicating circuit of main frame 1.Fig. 2 provides the embodiment of the invention and adopts 4 radar sensor 11 applying examples composition frame charts.In Fig. 2, be provided with 4 radar sensors 11; Radar sensor 11 is provided with input/output terminal, in addition earth terminal.Radar sensor 11 is connected with main frame 1 and receives in the automobile power supply.
Referring to Fig. 4, what said collector amplified output driving circuit 115 outputs is the envelope signal that pressure limiting output is arranged, and the envelope signal of output is set with high-amplitude, the high-amplitude≤4V of said output envelope signal; Said radar sensor 11 output to be connected main frame 1 connection on the amplitude>=0.7V of envelope signal; What Fig. 4 provided is signal of communication synoptic diagram of the present invention.
Referring to Fig. 3, said comparison, emitter-base bandgap grading input driving circuit 113 comprise resistance R 2, R4, R7, R6, triode Q1, Q2, diode D1A; The emitter of triode Q1 is connected with power circuit 111, and the collector of triode Q1 is connected with amplifying circuit 114, and the base stage of triode Q1 is connected with the collector of triode Q2 through resistance R 6; Resistance R 4 is connected across between the emitter and base stage of triode Q1; Resistance R 2 is connected across between the emitter of base stage and triode Q1 of triode Q2; The emitter of triode Q2 is connected with the communicating circuit of signal wire with main frame 1 through diode D1A.
Referring to Fig. 3, said collector amplifies output driving circuit 115 and comprises resistance R 13, R5, triode Q4, and capacitor C 8, the collector of triode Q4 is connected with resistance R 5, and resistance R 5 is connected with the communicating circuit of main frame 1; It is envelope signal to the signal of the communicating circuit transmission of main frame 1 that said collector amplifies output driving circuit 115.That Fig. 3 provides is the ultrasonic ranging sensor circuit theory of constitution figure of the embodiment of the invention, in Fig. 3, only provides a ultrasonic ranging sensor, and other ultrasonic ranging sensor is similar.
In Fig. 3, diode D1B, capacitor C 14 is formed power circuit 111, for the ultrasonic ranging sensor provides the working point power supply.
Amplifier T1 and R3 form amplifying circuit 114.
SEN1 is a piezoceramic transducer 117
Resistance R 11, R10, VR1, R15, R12, R18, R19, capacitor C 10, C11, C6, diode D2, integrated circuit U1 form reception amplifying circuit 116.
Resistance R 13, R5, triode Q4, capacitor C 8 grades are formed collector and are amplified output driving circuit 115.
The system works principle:
Main frame 1 charges to sensor electrical source circuit 111 through communication interface 2, and power circuit 111 provides working power with this each one to sensor 11; Main frame 1 is through 2 pairs of comparisons of communication interface, emitter-base bandgap grading input driving circuit 113 input drive signals simultaneously, and comparison, emitter-base bandgap grading input driving circuit 113 input drive signals amplify driving, and piezoceramic transducer 117 is driven, and outwards launches ultrasound wave.Reflected back ultrasound wave when ultrasound wave is run into barrier; Piezoceramic transducer 117 receives driving to convert electric signal to and is input to reception amplifying circuit 116; Amplify output driving circuit 115 through collector and export to main frame 1; Handle back warning reminding human pilot by main frame 1, play the purpose that auxiliary security is driven.
The principle of work of volt-limited radar sensor 11 is following:
Main frame 1 charges to C14 through D1B through 2 pairs of communication interfaces; Main frame 1 also passes through the signal wire input signal to the Q2 emitting stage; Q2 drives Q1 work after relatively, amplifies through amplifier T1 to drive piezoceramic transducer 117 work again, and piezoceramic transducer 117 sends faint ultrasound wave.
When driving piezoceramic transducer 117 receives the ultrasound wave that reflects; Piezoceramic transducer 117 produces faint electric signal; Output to collector after reception amplifying circuit 116 amplifications of this electric signal through U1A, U1B and peripheral circuit and amplify output driving circuit 115, amplify through Q4 and export to main frame.
Though in conjunction with accompanying drawing embodiment of the present invention has been described, those of ordinary skill in the art can make various distortion or modification within the scope of the appended claims.The technician of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the instructions just explains principle of the present invention; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications, and these variations and improvement all fall in the scope of the invention that requires protection.The present invention requires protection domain to be defined by appending claims and equivalent thereof.
Claims (4)
1. car parking accessory system with volt-limited radar sensor; Comprise main frame (1), radar sensor (11); Radar sensor (11) comprises power circuit (111), amplifying circuit (114), receives amplifying circuit (116), piezoceramic transducer (117), it is characterized in that: said radar sensor (11) also is provided with comparison, emitter-base bandgap grading input driving circuit (113) and collector and amplifies output driving circuit (115);
The input end of power circuit (111) is connected with the communicating circuit of main frame (1) through signal wire, and the output terminal of power circuit (111) is connected with the input end of comparison, emitter-base bandgap grading input driving circuit (113); Comparison, emitter-base bandgap grading input driving circuit (113) comprise 2 input ends and 1 output terminal; Wherein, Output terminal is connected with the input end of amplifying circuit (114); An input end is connected with the output terminal of power circuit (111), and another input end is connected with the communicating circuit of main frame (1) through signal wire, and this input end also is connected with the output terminal of collector amplification output driving circuit (115) simultaneously; The output terminal of amplifying circuit (114) is connected with the input end of piezoceramic transducer (117); The output terminal of piezoceramic transducer (117) is connected with the input end that receives amplifying circuit (116); The output terminal that receives amplifying circuit (116) is connected with the input end that collector amplifies output driving circuit (115); The output terminal that collector amplifies output driving circuit (115) is connected with the communicating circuit of main frame (1).
2. the car parking accessory system with volt-limited radar sensor according to claim 1; It is characterized in that: what said collector amplified output driving circuit (115) output is the envelope signal that pressure limiting output is arranged; The envelope signal of output is set with high-amplitude, the high-amplitude≤4V of the envelope signal of said output; Said radar sensor (11) outputs to the amplitude>=0.7V of the envelope signal on main frame (1) communicating circuit.
3. the car parking accessory system with volt-limited radar sensor according to claim 1 and 2 is characterized in that: said comparison, emitter-base bandgap grading input driving circuit (113) comprise resistance R 2, R4, R7, R6, triode Q1, Q2, diode D1A; The emitter of triode Q1 is connected with power circuit (111), and the collector of triode Q1 is connected with amplifying circuit (114), and the base stage of triode Q1 is connected with the collector of triode Q2 through resistance R 6; Resistance R 4 is connected across between the emitter and base stage of triode Q1; Resistance R 2 is connected across between the emitter of base stage and triode Q1 of triode Q2, and the R2 end that links to each other with the base stage of Q2 also is connected the end of R7 simultaneously, and the other end of R7 is connected to ground; The emitter of triode Q2 is connected with the communicating circuit of signal wire with main frame (1) through diode D1A.
4. the car parking accessory system with volt-limited radar sensor according to claim 1 and 2; It is characterized in that: said collector amplifies output driving circuit (115) and comprises resistance R 13, R5; Triode Q4, capacitor C 8, the collector of triode Q4 is connected with resistance R 5 one ends; Triode Q4 emitter is connected to ground, and the other end of resistance R 5 is connected with the communicating circuit of main frame (1); R13 one end is connected to the output terminal that receives amplifying circuit (116).The other end is connected to an end of capacitor C 8, and the other end of C8 connects the base stage of triode Q4; It is envelope signal to the signal of the communicating circuit transmission of main frame (1) that said collector amplifies output driving circuit (115).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102150594A CN101866004B (en) | 2010-07-01 | 2010-07-01 | Car parking accessory system having volt-limited radar sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102150594A CN101866004B (en) | 2010-07-01 | 2010-07-01 | Car parking accessory system having volt-limited radar sensor |
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| CN101866004A CN101866004A (en) | 2010-10-20 |
| CN101866004B true CN101866004B (en) | 2012-07-25 |
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| CN2010102150594A Expired - Fee Related CN101866004B (en) | 2010-07-01 | 2010-07-01 | Car parking accessory system having volt-limited radar sensor |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN85201675U (en) * | 1985-09-03 | 1986-10-15 | 北京工业学院电子工程系 | Automatic discrete frequency-controlling system |
| CN101068051A (en) * | 2006-11-09 | 2007-11-07 | 中国科学院电子学研究所 | Stripline large power microwave amplitude limiter |
| CN201732164U (en) * | 2010-07-01 | 2011-02-02 | 重庆光前汽车零部件制造有限公司 | Automobile parking assist system with surge suppressing radar sensor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010109708A (en) * | 2008-10-30 | 2010-05-13 | Fujitsu Ten Ltd | Triangular wave signal generating circuit, and radar device |
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2010
- 2010-07-01 CN CN2010102150594A patent/CN101866004B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85201675U (en) * | 1985-09-03 | 1986-10-15 | 北京工业学院电子工程系 | Automatic discrete frequency-controlling system |
| CN101068051A (en) * | 2006-11-09 | 2007-11-07 | 中国科学院电子学研究所 | Stripline large power microwave amplitude limiter |
| CN201732164U (en) * | 2010-07-01 | 2011-02-02 | 重庆光前汽车零部件制造有限公司 | Automobile parking assist system with surge suppressing radar sensor |
Non-Patent Citations (3)
| Title |
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| JP特开2010-109708A 2010.05.13 |
| 刘国靖等.HPM短脉冲雷达接收机保护装置设计方法探讨.《电子机械工程》.2001,(第04期),8-12. * |
| 刘国靖等.高功率微波短脉冲雷达接收机保护装置设计.《西安电子科技大学学报(自然科学版)》.2002,第29卷(第02期),236-240. * |
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