CN1195367C

CN1195367C - Several multiple physical quantity sensor dignal bus transmission system

Info

Publication number: CN1195367C
Application number: CNB03124565XA
Authority: CN
Inventors: 唐德尧; 杨政明; 吴拥军; 王巍松
Original assignee: Beijing Tanzhi Science & Technology Development Co Ltd
Current assignee: Beijing Tanzhi Science & Technology Development Co Ltd
Priority date: 2003-06-20
Filing date: 2003-06-20
Publication date: 2005-03-30
Anticipated expiration: 2023-06-20
Also published as: CN1460838A

Abstract

The present invention relates to a bus transmission system for a plurality of signals of a multi-physical quantity sensor. In the bus transmission system, a large quantity of signals of a compound sensor 1 comprising various physical quantity sensing devices and a built-in conditioner are detected by a single compound bus 3 and a plurality of active junction boxes 2. The present invention has the characteristics of simple and saving wiring of a sensor, rich obtained information and high detection speed; voltage and current conversion can be converted in an active junction box in order to increase transmission distance and improve frequency response and interference resistance, and pollution resistance processing can be carried out in an active junction box. The present invention has favorable application effects in tests of a vehicle fault diagnosis system.

Description

A kind of a plurality of many physical quantity transducers signal bus transmission system

Technical field

The present invention relates to a kind of a plurality of many physical quantity transducers signal bus transmission system, it belongs to system monitoring and testing apparatus.

Background technology

Existing relating in the system that multiple physical quantity detected and used the sensor of a plurality of same physical quantitys and test, has plenty of the transmission separately of each transducer, for example the transducer that a large amount of vibratory impulses that use detect in single-point and multiple spot detect in the past; Have plenty of the output variable of each transducer of same physical quantity is carried out digitlization, particularly the differentiation number of transducer carries out digitlization, transmits by sensor bus then, for example digital temperature sensor 18b20, it carries out digitlization to the temperature that detects, with I ²The C mode sends, and in such transducer each all has a unique numbering of being preserved by 64 laser ROM, and temperature-detecting device passes through I ²The C bus is called out certain the 18B20 number of sensor that is connected on the bus, and corresponding sensor is passed through I after receiving this numbering ²C bus passback temperature data is given temperature-detecting device, and other transducers of running counter to calling are not then to I ²The C bus sends data.The typical application example is an existing detection train bearing temperature " axle temperature annunciator ".These technology still can not solve the problem of a plurality of, multiple physical quantity detecting sensor bus transfer.

Summary of the invention

Purpose of the present invention, be to design a kind of technology that detects a plurality of compound sensor signals of multiple physical quantity by the sensor bus transmission, solve in the engineering site application owing to a large amount of problems of using a plurality of, many physical quantity transducers to use a large amount of cables separately to the monitoring instrument transmission.

Another object of the present invention is to solve the compound sensor of the many physical quantitys detections that connect with sensor bus and the problem of signal conditioner thereof.

Another purpose of the present invention is to solve the terminal box technical problem that the relatively more concentrated transducer of distribution connects with sensor bus.

The present invention realizes as follows.

It comprises transducer 1, and terminal box 2 and bus 3 is characterized in that:

Described transducer 1 is a kind of compound sensor that contains a plurality of physical quantity Sensitive Apparatuses and built-in conditioner;

Described terminal box 2 be a kind of contain a plurality of sensor plug seats 20 (201～20M), the active terminal box of computer 21, a plurality of physical quantity diverter switch 22, communication interface 23, bus hub 24 (241～242);

Each terminal box 2 by sensor plug seat 20 (201～20M) be equal to or less than M transducer 1 and be connected;

Described bus 3 is a kind of compound buses that contain power line 31, analog communications lines 32, digital communication line 33,34 and ground wire 35;

Bus hub 24 (as 241) by the active terminal box 2 of connector assembly and any one is connected from the compound bus 3 of monitoring instrument, and the bus hub (as 241) of another bus hub (as 242) of this active terminal box 2 by connector assembly and another active terminal box is by compound bus cascade.

Description of drawings

Fig. 1 is a principle of the invention block diagram;

Fig. 2 is the compound sensor schematic diagram that contains a plurality of physical quantity Sensitive Apparatuses and built-in conditioner;

Fig. 3 is the conditioner schematic block circuit diagram;

Fig. 4 is the conditioner circuit theory diagrams;

Fig. 5 is active terminal box theory diagram;

Fig. 6 is the voltage current adapter schematic diagram;

Fig. 7 is the antipollution circuit theory diagrams.

Embodiment

Shown in Fig. 1-7:

It comprises transducer 1, terminal box 2 and bus 3, wherein

As Fig. 2 is the compound sensor schematic diagram that contains a plurality of physical quantity Sensitive Apparatuses and built-in conditioner; It is characterized in that this compound sensor 1 contains vibratory impulse Sensitive Apparatus 11, temperature sensor 12, conditioner circuit 13 and binding post 14, wherein

The supply pin 141 of binding post 14 is received the supply pin 131 of conditioner circuit,

The foot of the ground wire 145 of binding post 14 is received the foot of the ground wire 137 of conditioner circuit,

The analog output 142 of binding post 14 connects the analog output 132 of conditioner 13,

The gain-adjusted end 144 of binding post 14 connects the gain-adjusted end 136 of conditioner 13,

The digital I end 122 of the digital I end 143 jointing temp Sensitive Apparatuses 12 of binding post 14,

The supply pin 121 of temperature sensor 12 connects the power output end 135 of conditioner 13,

The foot of the ground wire 123 of temperature sensor 12 connects the ground terminal 137 of conditioner 13,

Two ends Z2, the Z1 of vibratory impulse Sensitive Apparatus 11 connects 133,134 ends of conditioner 13.

Described temperature sensor 12 can be the 18B20 digital temperature sensor.Described vibratory impulse Sensitive Apparatus can be piezoelectric ceramic or its combination.

As Fig. 3, described conditioner circuit 13 comprises reference power supply 138, differential circuit 139, sensitivity channel 13A and terminal 131～137, power supply terminal 131 and ground wire terminal 137 are received reference circuit 138, differential circuit 139, the power end D of sensitivity channel 13A and ground terminal G, the reference voltage of the output O output of reference circuit is received the benchmark input end J of terminal 135 and differential circuit 139, the vibratory impulse sensor input Z1 of differential circuit, Z2 receives

terminal

134 and 133, the signal output part O0 of differential circuit 139 receives the input I of sensitivity channel, the output O1 of sensitivity channel, O2 receives terminal 132,136, at terminal 132,136 external resistance R L that carry out the sensitivity adjusting.

Fig. 4 is the physical circuit of conditioner circuit 13.Form reference circuit by resistance R 1, R2 and voltage-stabiliser tube Z, one end of resistance R 1 is the power end D that links to each other with terminal 131 of this circuit, the anode of other end connecting resistance R2 and voltage-stabiliser tube Z, the negative terminal of resistance R 2 other ends and voltage-stabiliser tube Z meets the ground terminal G of this circuit, ground terminal G connecting terminal 137, the tie point of R1 and R2 promptly is the output O of reference circuit, receives the benchmark input end J of terminal 135 and differential circuit 139, and the reference voltage of conditioner circuit 13 equals the operating voltage of voltage-stabiliser tube;

By resistance R 3, R4, R5, R6, R7, R8, amplifier N1, N2, N3 (with N4 be with a slice four high guaily unit, use identical power supply) composition differential circuit 139, its input port J receives the output O of reference circuit, be also connected to resistance R 3, R4, the end of R6, the other end of resistance R 3 is received anode and the Z2 port of amplifier N1, be connected to terminal 133 through Z2, anode and the Z1 port of another termination amplifier N2 of resistance R 4, be connected to terminal 134 through Z1, amplifier N1, the negative terminal of N2 is received the output of oneself, the other end of resistance R 6 is received the anode of amplifier N3, the output of amplifier N1 is received the anode of amplifier N3 through resistance R 5, the output of amplifier N2, process resistance R 7 is received the negative terminal of amplifier N3, and the negative terminal of amplifier N3 is also received its output through resistance R 8, and the output of amplifier N3 promptly is the output O0 of differential circuit, wherein resistance R 5, the resistance of R7 equates, resistance R 6, the resistance of R8 equates;

By resistance R 9, RL and amplifier N4 form sensitivity channel 13A, the power end of amplifier promptly is the power end D of circuit, receive terminal 131, the negative power end of amplifier promptly is the ground terminal G of circuit, receive terminal 137, the positive input terminal of amplifier is received the benchmark input end J of differential circuit, one end of resistance R 9 is input I of described conditioner circuit 13, receive the output O0 of differential circuit, the other end is received the negative input end of amplifier N4, also receives terminal 136, by terminal external or in the resistance R L that connects receive terminal 132, terminal 132 is received the output of amplifier, by changing the sensitivity that RL/R9 changes conditioner.

For example shown in Figure 5 as implementing, described active terminal box 2 be comprise a plurality of sensor plug seats 20 (201～20M), the active terminal box of computer 21, diverter switch 22, communication interface 23, bus hub 24 (241～242), the quantity of the diverter switch of active terminal box, equal need to separate from the contained physical quantity number of sensor signal, this example is 2, the port number of diverter switch is equal to or greater than the number M of number of sensors and sensor plug seat 20, and this routine port number is 8.Sensor plug seat 21 (201～20M) with the relation of sensor terminal by cable connection, be for example following table with 201 sockets:

Connect signal content	Power supply just	Analog signal	Digital I	Transfer sensitivity	Ground wire
Connect signal content	Power supply just	Analog signal	Digital I	Transfer sensitivity	Ground wire	Sensor terminal number	141	142	143	144	145
Terminal block receptacle pin number	2011	2012	2013		2015	Sensor terminal number	141	142	143	144	145

The diverter switch 22 of the active terminal box 2 of present embodiment contains analog switch 221, digital switch 222;

Passage 1～the M of described analog switch 221 is connected with pin number 2012～20M2 of sensor plug seat 201～20M respectively, the analog output signal O1 that this analog switch 221 switches and the pin of bus hub 241, No. 242 2412,2422 is connected, and these analog switch 221 channel address and sheet select and ternary control port K1 is connected to the PO0 mouth of computer 21;

Passage 1～the M of digital switch 222 is connected with pin number 2013～20M3 of sensor plug seat 201～20M respectively, the digital I signal O2 of its switching is connected with the PIO1 mouth of computer, and its channel address, sheet choosing and ternary control and IO direction control port K2 also are connected to the PIO1 mouth of computer 21; At the port number of (PIO1) of computer (21) interface during more than or equal to described transducer digital signal port number M, directly with (PIO1) mouthful as digital switch (222); Because computer 21 can pass through the digital information that communication interface sends transducer that this terminal box is had jurisdiction over fast at ordinary times by the digital signal of digital switch detecting sensor when detecting instrument needs, greatly improved detection speed.

The PIO2 mouth of computer 21 is connected to the data I end of

communication interface

23, and 1 or 2 order wires of communication interface 23 are connected to the

corresponding pin numbers

2413,2423 and 2414,2424 of bus hub 241,242,

The foot of the

ground wire

2415,2425 of bus hub 241,242 is connected with the ground wire of all circuit, is also connected to foot of the ground wire number 2015～20M5 of sensor plug seat 201～20M.

After the

supply pin

2411,2421 of bus hub 241,242 is regulated directly or by the correspondent voltage trim, be connected to the power end of each circuit and be connected to supply pin number 2011～20M1 of sensor plug seat 201～20M.

Compound bus 3 sees the following form with the annexation of the bus hub 241,242 of active terminal box 2:

Connect signal content	Power supply	Analog signal	Communication	1	Communication 2	Ground wire
Connect signal content	Power supply	Analog signal	Communication	1	Communication 2	Ground wire	The bus sequence number	31	32	33	34	35
Bus hub pin number	2411	2412	2413	2414	2415		The bus sequence number	31	32	33	34	35
Bus hub pin number	2411	2412	2413	2414	2415	Bus hub pin number	2421	2422	2423	2424	2425

As Fig. 6,, increase the voltage current adapter that analog voltage signal is converted to the current signal teletransmission for frequency response and the antijamming capability that improves the analog signal teletransmission.This voltage current adapter is connected between the

2412,2422 of the output O1 of analog switch 221 and bus plug seat 24.Described voltage current adapter contains amplifier N5, N6, resistance R 10～R14 and diode V1, the output O1 of analog switch 221 meets the positive input terminal I3 of amplifier N5, the output of N5 is received the positive input terminal of N6 through resistance R 11, the positive input terminal of N6 also passes through resistance R 12 ground connection, the output of N5 is connecting resistance R10 also, the other end connecting resistance R13 of R10 and the anode of diode V1, the pin 2412 of bus plug seat 24 is received in the negative terminal output of V1,2422, the negative input end of another termination N6 of resistance R 13, the negative input end process resistance R 14 of N6 is received the output of N6, and the output of N6 is also received the negative input end of N5; Resistance R 12, R14 resistance equate that resistance R 13, R11 resistance equate that the output current I of V1 and the input voltage U of I3 have functional relation: I=U (R13/R14)/R10.

As Fig. 7, make the contaminated load effect of digital level of transducer and digital quantity diverter switch in order to prevent that transducer and connector assembly are contaminated and lost efficacy, increase the antipollution circuit.Described antipollution circuit is connected in parallel on before the digital quantity diverter switch 222 of active terminal box 2, it comprises identical with digital quantity diverter switch port number M, each passage input is in parallel with the passage input of digital quantity diverter switch, its channel address, sheet choosing and ternary control, IO direction control port K3 is second analog switch 25 of synchronous working with the corresponding control port K2 parallel connection of digital quantity diverter switch also, resistance R 20～R21, capacitor C 20, amplifier N7 and benchmark VCC, the output O3 of second analog switch 25 receives controlling resistance R20, detect an end of resistance R 21, the output of another termination amplifier N7 of R20, the negative input end of another termination amplifier N7 of R21, the negative input end of N7 is to output integrating capacitor C20, the positive input termination benchmark VCC of N7 of inserting also in parallel.The second analog switch DG408 of embodiment, R20=0.56k, R21=100k, C20=0.1uf, VCC=5V, N7 uses 0～10V power supply.The level at ordinary times of the IO line that diverter switch 222 is connected with transducer is VCC, during communication, 0 level pulse of high frequency is arranged, this circuit synchronous detecting IO line level, and the N7 output also is the VCC level when the IO line is the VCC level, does not influence IO line level; When the IO line frequency of occurrences is 0 level pulse of F, time constant R22*C20 is greater than the integrating circuit output 1.5VCC high level of 1/F, by R20 to the IO line inject still can guarantee IO line logic level qualified on draw constant current, if the IO line is subjected to the more pollution of high-voltage power supply electric leakage, then send drop-down constant current to resist this pollution to the IO line by R20, if the IO line is subjected to the pollution to Leaked Current of Line to Ground, then on sending, the IO line draw constant current to resist this pollution by R20.

The present invention is by single compound bus 3 and a plurality of active terminal box 2, detect the signal of the compound sensor 1 that contains multiple physical quantity Sensitive Apparatus and built-in conditioner in a large number, has simple, the saving of sensor wiring, obtain abundant information, detection speed is fast, can in active terminal box, carry out the electric current and voltage conversion to improve transmission range, improve frequency response and resistance interference and in active terminal box, carry out the characteristics that antipollution is handled.Effect is outstanding in the vehicle-mounted fault diagnosis system test.

Claims

1, a kind of a plurality of many physical quantity transducers signal bus transmission system, it comprises transducer (1), terminal box (2) and bus (3) is characterized in that:

Described transducer (1) is a kind of compound sensor that contains a plurality of physical quantity Sensitive Apparatuses and built-in conditioner;

Described terminal box (2) is a kind of active terminal box that contains a plurality of sensor plug seats (20), computer (21), a plurality of physical quantity diverter switch (22), communication interface (23), bus hub (24);

Each terminal box (2) by sensor plug seat (20) be equal to or less than M transducer (1) and be connected;

Described bus (3) is a kind of compound bus that contains power line (31), analog communications lines (32), digital communication line (33,34) and ground wire (35);

Bus hub (24) by the active terminal box of connector assembly and any one (2) is connected from the compound bus (3) of monitoring instrument, and the bus hub of another bus hub of this active terminal box (2) by connector assembly and another active terminal box is by compound bus cascade.

2, a kind of a plurality of many physical quantity transducers signal bus transmission systems as claimed in claim 1, it is characterized in that described transducer (1) contains vibratory impulse Sensitive Apparatus (11), temperature sensor (12), conditioner circuit (13) and binding post (14), wherein:

The supply pin (141) of binding post (14) is received the supply pin (131) of conditioner circuit,

The foot of the ground wire (145) of binding post (14) is received the foot of the ground wire (137) of conditioner circuit,

The analog output (142) of binding post (14) connects the analog output (132) of conditioner (13),

The gain-adjusted end (144) of binding post (14) connects the gain-adjusted end (136) of conditioner (13),

The digital I end (122) of digital I end (143) the jointing temp Sensitive Apparatus (12) of binding post (14),

The supply pin (121) of temperature sensor (12) connects the power output end (135) of conditioner (13),

The foot of the ground wire (123) of temperature sensor (12) connects the ground terminal (137) of conditioner (13),

The two ends of vibratory impulse Sensitive Apparatus (11) (Z2, Z1) connect (133,134) end of conditioner (13).

3, a kind of a plurality of many physical quantity transducers signal bus transmission systems as claimed in claim 2 is characterized in that described temperature sensor (12) is the 18B20 digital temperature sensor, and described vibratory impulse Sensitive Apparatus is a piezoelectric ceramic.

4, a kind of a plurality of many physical quantity transducers signal bus transmission systems as claimed in claim 2, it is characterized in that: described conditioner circuit (13) is by resistance (R1, R2) and voltage-stabiliser tube (Z) form reference circuit, one end of resistance (R1) is the power end (D) that links to each other with terminal (131) of this circuit, the anode of other end connecting resistance (R2) and voltage-stabiliser tube (Z), the negative terminal of resistance (R2) other end and voltage-stabiliser tube (Z) connects the ground terminal (G) of this circuit, ground terminal (G) connecting terminal (137), the tie point of resistance (R1) and resistance (R2) promptly is the output (O) of reference circuit, receive the benchmark input end (J) of terminal (135) and differential circuit (139), the reference voltage of conditioner circuit (13) equals the operating voltage of voltage-stabiliser tube;

By resistance (R3, R4, R5, R6, R7, R8), amplifier (N1, N2, N3) form differential circuit (139), its input port (J) is received the output (O) of reference circuit, be also connected to resistance (R3, R4, R6) a end, the other end of resistance (R3) is received the anode and the port (Z2) of amplifier (N1), be connected to terminal (133) through (Z2), the anode of another termination amplifier (N2) of resistance (R4) and port (Z1), be connected to terminal (134) through (Z1), amplifier (N1, N2) negative terminal is received the output of oneself, the other end of resistance (R6) is received the anode of amplifier (N3), the output of amplifier (N1) is received the anode of amplifier (N3) through resistance (R5), the output of amplifier (N2), receive the negative terminal of amplifier (N3) through resistance (R7), the negative terminal of amplifier (N3) also passes through resistance (R8) and receives its output, the output of amplifier (N3) promptly is the output (O0) of differential circuit, wherein resistance (R5, R7) resistance equates, resistance (R6, R8) resistance equates;

By resistance (R9, RL) and amplifier (N4) form sensitivity channel (13A), the power end of amplifier promptly is the power end (D) of circuit, receive terminal (131), the negative power end of amplifier promptly is the ground terminal (G) of circuit, receive terminal (137), the positive input terminal of amplifier is received the benchmark input end (J) of differential circuit, one end of resistance (R9) is the input (I) of described conditioner circuit (13), receive the output (O0) of differential circuit, the other end is received the negative input end of amplifier (N4), also receive terminal (136), by terminal external or in the resistance (RL) that connects receive terminal (132), terminal (132) is received the output of amplifier, changes the sensitivity of conditioner by the ratio that changes resistance R L and resistance R 9.

5, a kind of a plurality of many physical quantity transducers signal bus transmission systems as claimed in claim 1, it is characterized in that: described terminal box (2) is the active terminal box that comprises a plurality of sensor plug seats (20), computer (21), diverter switch (22), communication interface (23), bus hub (24), the quantity of the diverter switch of active terminal box, equal need to separate from the contained physical quantity number of sensor signal, the port number of diverter switch is equal to or greater than the number M of number of sensors and sensor plug seat (20);

Described diverter switch (22) contains analog switch (221), digital switch (222);

(number (2012～20M2) are connected 201～20M) pin the passage 1～M of described analog switch (221) with the sensor plug seat respectively, the analog output signal (O1) that described analog switch (221) switches is connected with the pin number (2412,2422) of bus hub (241,242), and this analog switch (221) channel address and sheet choosing and ternary control end (K1) are connected to (PO0) mouth of computer (21);

(number (2013～20M3) are connected 201～20M) pin the passage 1～M of digital switch (222) with the sensor plug seat respectively, numeral (IO) signal (O2) of these digital switch 222 switchings is connected with (PIO1) of computer mouthful, these digital switch 222 channel address, sheet choosing and (PIO1) mouth that three-state is controlled and (IO) direction control port (K2) also is connected to computer (21); At the port number of (PIO1) of computer (21) interface during more than or equal to described transducer digital signal port number M, directly with (PIO1) mouthful as digital switch (222);

(PIO2) of described computer (21) mouth is connected to data (IO) end of communication interface (23), and 1 or 2 order wires of communication interface (23) are connected to the corresponding pin number (2413,2423) and the pin number (2414,2424) of bus hub (241,242);

The foot of the ground wire (2415,2425) of described bus hub (241,242) is connected with the ground wire of all circuit, is also connected to sensor plug seat (201～20M) foot of the ground wire numbers (2015～20M5);

After the supply pin (2411,2421) of bus hub (241,242) is regulated directly or by the correspondent voltage trim, be connected to the power end of each circuit and be connected to sensor plug seat (201～20M) supply pin numbers (2011～20M1).

6, a kind of a plurality of many physical quantity transducers signal bus transmission systems as claimed in claim 1, it is characterized in that: the output (O1) of the analog switch (221) of described a plurality of physical quantity diverter switches (22) and the pin (2412 of bus hub (24), 2422) also be in series with voltage current adapter between, this voltage current adapter contains amplifier (N5, N6), resistance (R10～R14) and diode (V1), the output (O1) of analog switch (221) connects the positive input terminal (I3) of amplifier (N5), the output of amplifier (N5) is received the positive input terminal of amplifier (N6) through resistance (R11), the positive input terminal of amplifier (N6) also passes through resistance (R12) ground connection, the output of amplifier (N5) is connecting resistance (R10) also, the other end connecting resistance (R13) of this resistance (R10) and the anode of diode (V1), (V1) pin (2412 of bus plug seat (24) is received in negative terminal output, 2422), the negative input end of another termination amplifier (N6) of resistance (R13), the negative input end process resistance (R14) of amplifier (N6) is received the output of amplifier (N6), and the output of amplifier (N6) is also received the negative input end of amplifier (N5); Resistance (R12, R14) resistance equates that resistance (R13, R11) resistance equates.

7, a kind of a plurality of many physical quantity transducers signal bus transmission systems as claimed in claim 1, it is characterized in that: the digital quantity diverter switch (222) of described active terminal box (2) is parallel with the antipollution circuit before, this antipollution circuit comprises second analog switch (25), resistance (R20～R21), electric capacity (C20), amplifier (N7) and benchmark (VCC), described second analog switch (25) is identical with digital quantity diverter switch port number M, this each passage input of second analog switch (25) is in parallel with the passage input of digital quantity diverter switch, and the channel address of second analog switch (25), sheet choosing and ternary control, IO direction control port (K3) is the synchronous working with corresponding control port (K2) parallel connection of digital quantity diverter switch also; The output (O3) of second analog switch (25) is received controlling resistance (R20), is detected an end of resistance (R21), the output of another termination amplifier (N7) (R20), the negative input end of another termination amplifier (N7) of resistance (R21), the negative input end of amplifier (N7) is to output integrating capacitor (C20), the positive input termination benchmark (VCC) of amplifier (N7) of inserting also in parallel.

8, as a kind of a plurality of many physical quantity transducers signal bus transmission systems of claim 1 or 7, second analog switch that it is characterized in that the antipollution circuit of described terminal box (2) is used (DG408), resistance (R20) resistance is 0.56k, resistance (R21) resistance is 100k, electric capacity (C20) capacitance is 0.1uf, benchmark (VCC) adopts 5V direct current supply, and amplifier (N7) is used 0～10V power supply.