CN101560918B

CN101560918B - Control circuit for detecting oil mist

Info

Publication number: CN101560918B
Application number: CN200910103914XA
Authority: CN
Inventors: 詹朝润; 赵新武
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-05-21
Filing date: 2009-05-21
Publication date: 2012-03-14
Anticipated expiration: 2029-05-21
Also published as: CN101560918A

Abstract

The invention relates to a control circuit for detecting oil mist which comprises a central processing unit CPU, a DC/DC converter, wherein the DC/DC converter has two output ends, and the 5V output end of the DC/DC converter is connected with the central processing unit CPU; the control circuit further comprises a flue detection control circuit connected with the DC/DC converter, an oil mist concentration detection circuit, a blower detection control circuit, a stepping motor driving circuit and a fault alarm control circuit. The signal end of the flue detection control circuit is connected with the central processing unit CPU through an A/D converter; and the signal ends of the oil mist concentration detection circuit, the blower control circuit, the stepping motor driving circuit and the fault alarm control circuit are all connected with the central processing unit. The control circuit for detecting oil mist can automatically control the detection of oil mist concentration in each crankcase of an internal combustion engine, and give an alarm when the oil mist concentration in the crankcase of the internal combustion engine exceeds a calibration value, thereby saving the maintenance time and prolonging the service life of the internal combustion engine. The control circuit can also realize remote monitoring at a distance of 1000m, and a display can be arranged at a place outside a machine room for monitoring the internal combustion engine.

Description

The control circuit that is used for oil mist detection

Technical field

The present invention relates to a kind of oil mist detection control circuit.

Background technique

Large-scale diesel engine is as the power of boats and ships, locomotive, generator set and be widely used; In use can break down unavoidably; Major failure derives from the wearing and tearing and the part injury of diesel engines movement parts, and the wearing and tearing of diesel engines movement parts and part injury cause the lubricating oil heating easily and cause forming in the crankcase mist of oil to blast, like untimely discovery reparation; Will cause bigger loss; Even can cause whole diesel engine to be scrapped, the existing a kind of system that can detect mist of oil size in each crankcase of design that needs detects the oil mist concentration that each crankcase takes place.

Summary of the invention

The object of the invention just provides a kind of control circuit that is used for oil mist detection, and it can control the detection to oil mist concentration in each crankcase of internal-combustion engine automatically, when the crank case of internal combustion engine oil mist concentration exceeds calibration value; Send warning, internal-combustion engine is protected, stop internal combustion engine operation automatically; Judge exactly the crankcase that oil mist concentration exceeds calibration value takes place; Provide and fix a breakdown a little, practice thrift engineering time, prolong the working life of internal-combustion engine.

The objective of the invention is to realize through such technological scheme; Comprise central processor CPU and DC/DC transducer; The DC/DC transducer is provided with the output terminal of 24V and 5V; The 5V output terminal of DC/DC transducer links to each other with central processor CPU; It is characterized in that: it comprises that also flue detects control circuit, oil mist concentration testing circuit, blower fan detection control circuit, stepper motor driving circuit and malfunction alarm control circuit; The power input that flue detects control circuit, oil mist concentration testing circuit, draught fan control circuit, stepper motor driving circuit and malfunction alarm control circuit all links to each other with the power output end of DC/DC transducer; Flue detects the control circuit signal end and links to each other with central processor CPU through A/D converter, and the signal end of oil mist concentration testing circuit, draught fan control circuit, stepper motor driving circuit and malfunction alarm control circuit all links to each other with central processor CPU.

Central processor CPU of the present invention is existing commercially available prod; Its model is AT89S52; In use; Central processor CPU, DC/DC transducer and above-mentioned circuit are arranged on the printed circuit board (PCB) with integrated mode; When the DC/DC transducer with after storage battery 24V is connected, the 5V output terminal of DC/DC transducer is that central processor CPU provides power supply, the 24V/5V output terminal of DC/DC transducer is that flue detects control circuit, oil mist concentration testing circuit, blower fan detects control circuit, stepper motor driving circuit and malfunction alarm control circuit provides power supply; In central processor CPU, export early warning, the alarming value of application program and oil mist concentration again, this application program can realize following function:

1, can control flue detection control circuit automatically the crankcase in the diesel engine is carried out cycle detection; 2, instruction blower fan detection control circuit is extracted the mist of oil in the crankcase out continuously; 3, induce the electrical signal of oil mist concentration according to the oil mist concentration testing circuit; After central processor CPU is scaled the oil mist concentration value with the electrical signal that receives; Make comparisons with preset alarming value; 4, the value that is converted into oil mist concentration when the electrical signal that receives is during greater than preset alarming value, and central processor CPU sends instruction and gives the malfunction alarm control circuit, makes its warning; If the value that the electrical signal that receives is converted into oil mist concentration is during less than preset alarming value, then central processor CPU control flue detects control circuit and continues crankcase is detected.

Owing to adopted technique scheme, the present invention to have easy to operate advantage, it can control the detection to oil mist concentration in each crankcase of internal-combustion engine automatically; When the crank case of internal combustion engine oil mist concentration exceeds calibration value, send warning, internal-combustion engine is protected; Automatically stop internal combustion engine operation; Judge exactly the crankcase that oil mist concentration exceeds calibration value takes place, provide and fix a breakdown a little, practice thrift engineering time; Prolong the working life of internal-combustion engine, it can also be connected with liquid crystal display panel can make the long-range demonstration of oil mist concentration size more directly perceived.The telemonitoring distance can reach 1000 meters, can other place that display screen is placed in beyond the machine room be kept watch on internal-combustion engine.

Description of drawings

Description of drawings of the present invention is following:

Fig. 1 is a circuit block diagram of the present invention;

Fig. 2 detects the circuit diagram of control circuit for flue among the present invention;

Fig. 3 is the circuit diagram of oil mist concentration testing circuit among the present invention;

Fig. 4 is the circuit diagram of apoplexy machine testing control circuit of the present invention;

Fig. 5 is the circuit diagram of stepper motor driving circuit among the present invention;

Fig. 6 is the circuit diagram of repeat circuit drive circuit of the present invention;

Fig. 7 is the circuit diagram of malfunction alarm control circuit, passage and gain drive circuit among the present invention;

Fig. 8 is the circuit diagram of reset circuit among the present invention;

Fig. 9 is the circuit diagram of medium-long range controlling output circuit of the present invention;

Figure 10 is the circuit diagram of central processor CPU among the present invention;

Figure 11 is a user mode reference drawing of the present invention.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is described further:

As shown in Figure 1; The present invention includes central processor CPU 1 and DC/DC transducer 2; DC/DC transducer 2 is provided with the output terminal of DC24V and DC5V; The 5V output terminal of DC/DC transducer 2 links to each other with central processor CPU 1; It is characterized in that: it comprises that also flue detects control circuit 3, oil mist concentration testing circuit 4, blower fan detection control circuit 5, stepper motor driving circuit 6 and malfunction alarm control circuit 7; The power input that flue detects control circuit, oil mist concentration testing circuit, draught fan control circuit, stepper motor driving circuit and malfunction alarm control circuit all links to each other with the power output end of DC/DC transducer; Flue detects the control circuit signal end and links to each other with central processor CPU through A/D converter, and the signal end of oil mist concentration testing circuit, draught fan control circuit, stepper motor driving circuit and malfunction alarm control circuit all links to each other with central processor CPU.

Like Fig. 2, shown in 10, flue detects control circuit and comprises the one or three end power supply V1, the first integrated operational amplifier U17A, the second integrated operational amplifier U17B, first resistance R 63, second resistance R 64, the 3rd resistance R 65, the 4th resistance R 66, the 5th resistance R 67, the 6th resistance R 73, the 7th resistance R 72, the 8th resistance R 74, the 9th resistance R 75, the tenth resistance R 85, first capacitor C 5, second capacitor C 13, the 3rd capacitor C 14, the 4th capacitor C 18, the 5th capacitor C 19, the 6th capacitor C 20, the first diode D24, the second diode D25, the first potentiometer VR1, the second potentiometer VR2, electrochemical capacitor E8, wherein; 1 foot one of the one or three end power supply V1 is to link to each other with 2 foots of the one or three end power supply V1 through the 7th resistance R 72; 1 foot one of the one or three end power supply V1 is to link to each other with movable contact 3 foots of the first potentiometer VR1, and stationary contact 1 foot of the first potentiometer VR1 is unsettled, and 2 foots one of the first potentiometer VR1 are to link to each other with 1 foot of the one or three end power supply V1 through the tenth resistance R 85; The one, link to each other with 2 foots of the one or three end power supply V1 through electrochemical capacitor E8; 2 foots of the first potentiometer VR1 are ground connection also, and 2 foots one of the one or three end power supply V1 are to link to each other with the first integrated operational amplifier U17A, are that the first integrated operational amplifier U17A provides+the 6V power supply; 2 foots one of the one or three end power supply V1 are to link to each other with an end of the 3rd capacitor C 14; The other end one of the 3rd capacitor C 14 is a ground connection, the one, link to each other with 3 foots of the one or three end power supply V1 through

second capacitor C

13, and 3 foots of the one or three end power supply V1 connect the 24V power supply; One end of first resistance R 63, the 6th resistance R 73 and the 4th capacitor C 18 links to each other with central processor CPU; The equal ground connection of the other end of the 6th resistance R 73 and the 4th capacitor C 18, the other end of first resistance R 63 links to each other with the input end in the same way of the first integrated operational amplifier U17A, and the reverse input end one of the first integrated operational amplifier U17A is through second resistance R, 64 ground connection; The one, link to each other with the output terminal of the first integrated operational amplifier U17A through the second potentiometer VR2; The 5th capacitor C 19 is attempted by the two ends of the second potentiometer VR2, and the output terminal of the first integrated operational amplifier U17A links to each other with the reverse input end of the second integrated operational amplifier U17B through the 4th resistance R 66, and the input end in the same way of the second integrated operational amplifier U17B is through the 5th resistance R 67 ground connection; The one, be connected with the output terminal of the second integrated operational amplifier U17B through the 3rd resistance R 65; The 6th capacitor C 20 is attempted by the input end in the same way of the second integrated operational amplifier U17B and the output terminal of the second integrated operational amplifier U17B, and the output terminal one of the second integrated operational amplifier U17B is through the 9th resistance R 75 ground connection, and the one, link to each other with A/D converter through the 8th resistance R 74; A/D converter is provided with eight terminal; Its first terminal link to each other with 37 sufficient ADCCS of central processor CPU, and second terminal link to each other with the 8th resistance R 74, and the 3rd terminal are unsettled; The 4th terminal ground connection; The 5th terminal all link to each other with 35 sufficient DIO of central processor CPU with the 6th terminal, and the 7th terminal link to each other with 36 sufficient ADCCLK of central processor CPU, and the 8th terminal one are through capacitor C 6 ground connection; The one, connect+the 24V power supply through resistance R 21, the one, through thyristor Q15 ground connection.

The first integrated operational amplifier U17A model that flue detects in the control circuit is LM317, and the second integrated operational amplifier U17B model is LM358, when work; Adjust the first potentiometer VR1, can the operating voltage of+6V be imported the first integrated operational amplifier U17A, photoelectric sensor is passed to A/D converter through amplifier U17A, U17B by after the first integrated operational amplifier U17A and the amplification of the second integrated operational amplifier U17B two-stage calculation; After the A/D converter conversion, send CPU to read; Output voltage values is directly proportional with light intensity, be inversely proportional to oil mist concentration, promptly light intensity more a little less than; Electrical signal converted then can be low, and then oil mist concentration is big more.

Like Fig. 3, shown in 10; The oil mist concentration testing circuit comprises the first photo coupler Q1, Darlington triode U19, the 7th capacitor C the 11, the 23 end power supply V2, the 11 resistance R the 24, the 12 resistance R the 37, the 13 resistance R the 54, the 14 resistance R the 55, the 15 resistance R 56, phototube TP2, photoemissive element TP3 and the first joint CZ3; The positive pole of the first photo coupler Q1 connects+the 5V power supply; The negative pole of the first photo coupler Q1 meets central processor CPU U16 chip 34 sufficient IR through resistance R 11; The collector electrode of the first photo coupler Q1 connects+the 24V power supply, and the emitter one of the first photo coupler Q1 is through the 14 resistance R 55 ground connection, and the one, connect the base stage of Darlington triode U19 through the 11 resistance R 24; Darlington triode U19 collector electrode one is to connect+the 24V power supply; The one, through the 7th capacitor C 11 ground connection, Darlington triode U19 collector electrode links to each other with 3 foots of the two or three end power supply V2, and 2 foots of the two or three end power supply V2 link to each other with 1 foot of the two or three end power supply V2 through the 13 resistance R 54; 1 foot of the two or three end power supply V2 meets phototube TP2; Photoemissive element TP3 links to each other with second terminal of the first joint CZ3, first terminal of the first joint CZ3 and the equal ground connection of the 4th terminal, and the 3rd terminal of the first joint CZ3 connect+the 5V power supply through the 12 resistance R 37; The 5th terminal one of the first joint CZ3 are to connect+the 5V power supply through the 15 resistance R 56, the one, link to each other with 8 sufficient FIR of central processor CPU.

The photosignal that phototube TP2 and photoemissive element TP3 produce, and convert optical signal into electrical signal and be sent to central processor CPU and differentiate, weaken like light intensity; Electrical signal converted then can reduce; Then oil mist concentration is big more, when electrical signal is reduced to a minimum, when promptly oil mist concentration surpasses predefined value; Central processor CPU will send alarm command and reported to the police by warning circuit, instruct complete machine to quit work automatically simultaneously.

Like Fig. 4, shown in 10; Draught fan control circuit comprises the three or three end power supply V3, the second photo coupler Q2, the 16 resistance R 25, the 8th capacitor C 12, the second joint CZ2; The second joint CZ2 is provided with four terminal; 1 foot of the three or three end power supply V3 links to each other with the 4th terminal 4 foots of the second joint CZ2; 2 foots of the three or three end power supply V3 link to each other with second terminal, 2 foots of the second joint CZ2, and 3 foots one of the three or three end power supply V3 are to be connected the A12V power supply with first terminal, 1 foot of the second joint CZ2, and the one, link to each other with 2 foots of the three or three end power supply V3 through the 8th capacitor C 12; The 3rd terminal 1 foot of the second joint CZ2 links to each other with the negative pole of the second photo coupler Q2; The positive pole of the second photo coupler Q2 connects A24V ' power supply through the 16 resistance R 25, and the collector electrode of the second photo coupler Q2 connects 18 sufficient FFJ of central processor CPU, the grounded-emitter connection of the second photo coupler Q2.

When the control blower fan actuating of relay, the blower fan feedback signal will make second photo coupler Q2 output consecutive pulses to CPU under the normal condition in the foregoing circuit, will think fan trouble if central processor CPU can not detect consecutive pulses.

Like Fig. 5, shown in 10; Stepper motor driving circuit comprises control joint CZ1, power interface CZ4, and control joint CZ1 is provided with five terminal, and first terminal, 1 foot connects the positive pole of phototube SI; Second terminal, 2 sufficient ground connection; The 3rd terminal 3 foots meet 40 sufficient CP of central processor CPU, and the 4th terminal 4 foots connect 41 sufficient CV of central processor CPU, the 5th wiring termination+5V power supply; Power interface CZ4 is provided with six terminal; Its first terminal, 1 foot connects 24V ' power supply; Second terminal, 2 foots meet 19 sufficient DCF of central processor CPU, and the 3rd terminal 3 foots, the 4th terminal 4 foots all are connected with 24V ' power supply, and the 5th terminal 5 foots and the 6th terminal 6 foots are ground connection all.

Connect stepper motor through control joint CZ1, two plug-in units of power interface CZ4 in the foregoing circuit, when central processing unit (CPU) CPU send step-by-step impulse, and given sense of rotation after, will be by the automatic rotation sweep of predetermined manner; Only if equipment failure.

Like Fig. 7, shown in 10, the malfunction alarm control circuit second chip U2, the 3rd chip U3 are provided with 16 terminal on the second chip U2 and the 3rd chip U3; Wherein, the 11 terminal of the second chip U2 all link to each other with 11 sufficient RRCLK of central processor CPU with the 11 terminal of the 3rd chip, and the 12 terminal of the second chip U2 all link to each other with 10 sufficient SRCLK of central processor CPU with the 12 terminal of the 3rd chip U3; The 8th terminal of the second chip U2 and the 3rd chip U3, the tenth terminal, the equal ground connection of the 13 terminal, 9 sufficient SER of the 14 terminal of the second chip U2 and central processor CPU, the 16 terminal one of the second chip U2 are to connect+the 5V power supply; The one, through capacitor C 1 ground connection, the negative pole of the 15 wiring termination the 7th light emitting diode D7 of the second chip U2, the positive pole of the 7th light emitting diode D7 connects+the 5V power supply through resistance; The negative pole of the first wiring termination the 6th light emitting diode D6 of the second chip U2, the 6th light emitting diode D6 resistance connects+the 5V power supply, the negative pole of the second wiring termination the 5th light emitting diode D5 of the second chip U2; The positive pole of the 5th light emitting diode D5 connects+the 5V power supply through resistance, the negative pole of the 3rd wiring termination the 4th light emitting diode D4 of the second chip U2, and the positive pole of the 4th light emitting diode D4 connects+the 5V power supply through resistance; The negative pole of the 4th wiring termination the 3rd light emitting diode D3 of the second chip U2, the positive pole of the 3rd light emitting diode D3 connects+the 5V power supply through resistance, the negative pole of the 5th wiring termination second light emitting diode D2 of the second chip U2; The positive pole of the second light emitting diode D2 connects+the 5V power supply through resistance, the negative pole of the 6th wiring termination first light emitting diode D1 of the second chip U2, and the positive pole of the first light emitting diode D1 connects+the 5V power supply through resistance; The negative pole of the 7th terminal sending and receiving optical diode D0 of the second chip U2, the positive pole of light emitting diode D0 connects+the 5V power supply through resistance, and the 9th terminal of the second chip U2 link to each other with the 14 terminal of the 3rd chip U3; The 16 terminal one of the 3rd chip U3 are to connect+the 5V power supply; The one, through capacitor C 2 ground connection, the negative pole of the 3rd chip U3 the 15 wiring termination the 15 light emitting diode D15, the positive pole of the 15 light emitting diode D15 connects+the 5V power supply through resistance; The negative pole of the 3rd chip U3 first wiring termination the 14 light emitting diode D14; The positive pole of the 14 light emitting diode D14 connects+the 5V power supply through resistance, the negative pole of the 3rd chip U3 second wiring termination the 13 light emitting diode D13, and the positive pole of the 13 light emitting diode D13 connects+the 5V power supply through resistance; The negative pole of the 3rd chip U3 the 3rd wiring termination the 12 light emitting diode D12; The positive pole of the 12 light emitting diode D12 connects+the 5V power supply through resistance, the negative pole of the 3rd chip U3 the 4th wiring termination the 11 light emitting diode D11, and the positive pole of the 11 light emitting diode D11 connects+the 5V power supply through resistance; The negative pole of the 3rd chip U3 the 5th wiring termination the tenth light emitting diode D10; The positive pole of the tenth light emitting diode D10 connects+the 5V power supply through resistance, the negative pole of the 3rd chip U3 the 6th wiring termination the 9th light emitting diode D9, and the positive pole of the 9th light emitting diode D9 connects+the 5V power supply through resistance; The negative pole of the 3rd chip U3 the 7th wiring termination the 8th light emitting diode D8, the positive pole of the 8th light emitting diode D8 connects+the 5V power supply through resistance.

The second chip U2, the 3rd chip U3 model are 74HC595, when breaking down, instruct the second chip U2, the 3rd chip U3 control output to make light emitting diode bright entirely by central processor CPU.

Like Fig. 7, shown in 10, the present invention also comprises passage and gain drive circuit, and this circuit comprises four-core sheet U4, the 5th chip U5, display led 1, the first triode Q1 and the second triode Q2; Four-core sheet U4 and the 5th chip U5 are provided with 16 terminal; Display led 1 is provided with 10 foots, 8 foots of the first wiring termination display led 1 of four-core sheet U4,3 foots of the second wiring termination display led 1 of four-core sheet U4; 2 foots of the 3rd wiring termination display led 1 of four-core sheet U4; 1 foot of the 4th wiring termination display led 1 of four-core sheet U4,10 foots of the 5th wiring termination display led 1 of four-core sheet U4,3 foots of the 6th wiring termination display led 1 of four-core sheet U4; 4 foots of the 7th wiring termination display led 1 of four-core sheet U4; The 8th terminal of four-core sheet U4 and the 5th chip U5, the tenth wiring termination, the equal ground connection of the 13 terminal, four-core sheet U4 all links to each other with 11 sufficient RRCLK of central processor CPU with the 11 terminal of the 5th chip U5, and four-core sheet U4 all links to each other with 10 sufficient SRCLK of central processor CPU with the 12 terminal of the 5th chip U5; The 9th terminal of the 14 wiring termination the 3rd chip U3 of four-core sheet U4; The 16 terminal one of four-core sheet U4 are to connect+the 5V power supply, the one, and through capacitor C 3 ground connection, the 9th terminal of the 14 wiring termination four-core sheet U4 of the 5th chip U5; The 16 terminal one of the 5th chip U5 are to connect+the 5V power supply; The one, through capacitor C 21 ground connection, the 15 terminal of the 5th chip U5 connect the base stage of the first triode Q1 through resistance R 22, and the collector electrode of the first triode Q1 connects+the 5V power supply; The emitter of the first triode Q1 connects 9 foots of display led 1 through resistance; First terminal of the 5th chip U5 connect the base stage of the second triode Q2 through resistance R 23, and the collector electrode of the second triode Q2 connects+the 5V power supply, and the emitter of the second triode Q2 connects 6 foots of display led 1 through resistance R 71.

Adjustment is advanced mist detection channels 1-N cylinder number and is selected and the shared digital display of gain adjustment; Exporting display led 1 to by four-core sheet U4 control shows; Automatically switch to the passage adjustment from gain during adjustment passage button, when the adjustment gain+,-time automatically switch to the gain adjustment from channel selecting again.

The adjustment gain is exactly the sensitivity that is used for the alarm signal judgement in fact.Export display led 1 to by the 5th chip U5 control and show that improve gain, reduce gain by '-' by '+' during the adjustment gain, digital display can show the 0-100%db scope.

Like Fig. 6, shown in 10, the present invention includes relay drive circuit, this circuit comprises the first chip U11, the 3rd photo coupler Q5, the 4th photo coupler Q7, the 5th photo coupler Q8, the 6th photo coupler Q9, the tenth photo coupler Q11, the 17 resistance R the 26, the 18 resistance R the 27, the 19 resistance R the 28, the 20 resistance R the 29, the 21 resistance R the 30, the 22 resistance R the 32, the 23 resistance R the 33, the 24 resistance R the 34, the 25 resistance R the 35, the 26 resistance R 36, first relay J 1, second relay J 2, the 3rd diode D22, the 4th diode D23, the 4th joint CZ5; The first chip U11 is provided with 18 terminal, the 9th terminal ground connection, the tenth wiring termination A24V power supply; Be parallel with 1 foot of the 18 wiring termination the 4th joint CZ5 of capacitor C 10, the first chip U11 between the 9th terminal and the tenth terminal, 2 foots of the 17 wiring the 4th joint CZ5 of the first chip U11; 3 foots of the 16 wiring the 4th joint CZ5 of the first chip U11, wherein, the collector electrode of three photo coupler Q5, the 4th photo coupler Q7, the 5th photo coupler Q8, the 6th photo coupler Q9 and the tenth photo coupler Q11 all connects the A24V power supply; The positive pole of the 3rd photo coupler Q5 connects+the 5V power supply through the 22 resistance R 32, and the negative pole of the 3rd photo coupler Q5 connects 23 foots of central processor CPU, and the emitter one of the 3rd photo coupler Q5 is through the 17 resistance R 26 ground connection; The one, link to each other with first terminal of the first chip U11, the positive pole of the 4th photo coupler Q7 connects+the 5V power supply through the 23 resistance R 33, and the negative pole of the 4th photo coupler Q7 meets 22 sufficient SLIGHT of central processor CPU; The emitter one of the 4th photo coupler Q7 is through the 18 resistance R 27 ground connection, the one, link to each other with second terminal of the first chip U11, and the positive pole of the 5th photo coupler Q8 connects+the 5V power supply through the 24 resistance R 34; The negative pole of the 5th photo coupler Q8 meets 21 sufficient TROUBLE of central processor CPU, and the emitter one of the 5th photo coupler Q8 is through the 21 resistance R 30 ground connection, and the one, link to each other with the 3rd terminal of the first chip U11; The positive pole of the 6th photo coupler Q9 connects+the 5V power supply through the 25 resistance R 35; The negative pole of the 6th photo coupler Q9 meets 20 sufficient BLOWE of central processor CPU, and the emitter one of the 6th photo coupler Q9 is through the 19 resistance R 28 ground connection, and the one, link to each other with the 4th terminal of the first chip U11; The positive pole of the tenth photo coupler Q11 connects+the 5V power supply through the 26 resistance R 36; The negative pole of the tenth photo coupler Q11 meets 19 sufficient DCF of central processor CPU, and the emitter one of the tenth photo coupler Q11 is through the 20 resistance R 29 ground connection, and the one, link to each other with the 5th terminal of the first chip U11; 1 foot of first relay J 1 connects A24V ' power supply; 2 foots of first relay J 1 are unsettled, and 3 foots of first relay J 1 connect the negative pole of the 3rd diode D22, the plus earth of the 3rd diode D22; 5 foots of first relay J 1 connect the A24V power supply; 4 foots of first relay J 1 connect the 15 terminal of the first chip U11,1 sufficient ground connection of second relay J 2; 2 foots of second relay J 2 are unsettled; 3 foots of second relay J 2 connect A24V ' power supply through the 4th diode D23, and 4 foots of second relay J 2 connect the 14 terminal of the first chip U11, and 5 foots of second relay J 2 connect the A24V power supply.

Control relay circuit has increased backward dioded; Improved the electromagnetic compatibility principle of system; Completion is to the control of warning, early warning, fault, blower fan, solenoid valve, and taked photoelectric isolation technology, improved the reliability of system; By the 4th joint CZ5 output, or export the driving plate tenminal block to.

Like Fig. 8, shown in 10; It also comprises reset circuit; This reset circuit comprises triode Q10, the 9th capacitor C the 15, the 27 resistance R the 57, the 28 resistance R the 58, the 29 resistance R 59, the first electrochemical capacitor E1, touch-switch K, and the base stage one of triode Q10 is to connect+the 5V power supply through the 28 resistance R 58, the one, and K is connected with touch-switch; The collector electrode one of triode Q10 is through the 9th capacitor C 15 ground connection; The one, connect+the 5V power supply through the 29 resistance R 59, the emitter one of triode Q10 is a ground connection, the one, K is connected with touch-switch; The first electrochemical capacitor E1 is connected in parallel between the base stage and emitter of triode Q10, and the 27 resistance R 57 is connected in parallel on the two ends of touch-switch K.

Like Fig. 9, shown in 10; Be connected with the telecontrol output circuit on the central processor CPU; This telecontrol output circuit comprises chip U22, the 7th photo coupler Q3, the 8th photo coupler Q4, the 9th photo coupler Q6, the 30 resistance R the 62, the 31 resistance R the 61, the 32 resistance R the 76, the 36 resistance R the 80, the 37 resistance R the 81, the 38 resistance R the 82, the 39 resistance R the 83, the 40 resistance R 84, the first reference diode D26, second voltage stabilizing, two utmost point D27, the 3rd joint CZ8, the second electrochemical capacitor E10, the four or three end power supply V4, the five or three end power supply V5, and wherein, chip U22 is provided with eight terminal; First terminal are connected with the negative pole of the 9th photo coupler Q6; The positive pole of the 9th photo coupler Q6 connects the A5V power supply through the 31 resistance R 61, the grounded-emitter connection of the 9th photo coupler Q6, and collector electrode connects+the 5V power supply through the 34 resistance R 78; Second terminal one of chip U22 are to be connected with the 3rd terminal of chip U22; The one, connect the A5V power supply through the 35 resistance R 79, the 3rd terminal of chip U22 are connected with the emitter of the 8th photo coupler Q4, and the collector electrode of the 8th photo coupler Q4 connects the A5V power supply; Logical the 30 resistance R 62 of the positive pole of the 8th photo coupler Q4 connects+the 5V power supply; The negative pole of the 8th photo coupler Q4 meets 12 sufficient EN485 of central processor CPU, and the 4th terminal one of chip U22 are through the 33 resistance R 77 ground connection, and the one, be connected with the collector electrode of the 7th photo coupler Q3; The grounded-emitter connection of the 7th photo coupler Q3; The positive pole of the 7th photo coupler Q3 connects+the 5V power supply through the 32 resistance R 76, and the negative pole of the 7th photo coupler Q3 meets 7 sufficient TX of central processor CPU, the 5th terminal ground connection of chip U22; The 6th terminal one of chip U22 are through the second reference diode D27 ground connection; The one, connect the A5V power supply through the 37 resistance R 81, the one, be connected through second termination of the 39 resistance R 83 with the 3rd joint CZ8, the 7th terminal one of chip U22 are through the first reference diode D26 ground connection; The one, through the 36 resistance R 80 ground connection; The one, be connected through first termination of the 38 resistance R 82 with the 3rd joint CZ8, between first termination of the 3rd joint CZ8 and second termination, be parallel with the 40 resistance R 84, the 8th terminal one of chip U22 are to connect the A5V power supply; The one, through the tenth capacitor C 29 ground connection; Input end 1 foot one of the four or three end power supply V4 is to connect the V24 power supply, the one, and through the second electrochemical capacitor E10 ground connection, the output terminal of the four or three end power supply V4 is connected with the input end of the five or three end power supply V5; The equal ground connection of common port of the common port of the four or three end power supply V4 and the five or three end power supply V5, the five or three end power supply V5 output A5V power supply.

The 7th photo coupler Q3, the 8th photo coupler Q4, the 9th photo coupler Q6 that foregoing circuit adopts three road photoelectricity to isolate will receive and dispatch, receive and dispatch ability control chip U22 and remote computer communication; Also increased the safety that the first reference diode D26, second voltage stabilizing, two utmost point D27 have protected interface on the circuit.

Shown in figure 10, the central processor CPU among the present invention has 44 and connects foot, its 15th sufficient earthing capacitor C 17 ground connection, and the third party's 4 foots are parallel with crystal oscillator pipe X1 through capacitor C 16 ground connection between the 15th foot and the 14th foot.

In sum; The present invention is integrated in the back use that matches with oil mist detector on the printed circuit board (PCB); Referring to Figure 11, mist of oil detection device comprises that mist of oil suction pump 8, flue divide survey device 9, oil mist concentration detector 10, and the outlet of flue branch survey device 9 detects 10 devices with oil mist concentration and communicates; The outlet of oil mist concentration detector 10 is communicated with mist of oil suction pump 8; The relief opening of mist of oil suction pump 8 communicates with the external world, and the mist of oil suction pump provides working power by printed circuit board (PCB) 11, and printed circuit board (PCB) 11, mist of oil suction pump 8, flue divide survey device 9 and oil mist concentration detector 10 all to be positioned on the casing 12; The oil mist concentration detector is connected with central processor CPU through datawire, makes the instruction of whether reporting to the police after being judged by central processor CPU.

Claims

1. control circuit that is used for oil mist detection; Comprise central processor CPU (1) and DC/DC transducer (2); DC/DC transducer (2) is provided with the output terminal of 24V and 5V; The 5V output terminal of DC/DC transducer (2) links to each other with central processor CPU (1), it is characterized in that: it comprises that also flue detects control circuit (3), oil mist concentration testing circuit (4), blower fan detection control circuit (5), stepper motor driving circuit (6) and malfunction alarm control circuit (7), and the power input that flue detects control circuit, oil mist concentration testing circuit, draught fan control circuit, stepper motor driving circuit and malfunction alarm control circuit all links to each other with the power output end of DC/DC transducer; Flue detects the control circuit signal end and links to each other with central processor CPU through A/D converter; The signal end of oil mist concentration testing circuit, draught fan control circuit, stepper motor driving circuit and malfunction alarm control circuit all links to each other with central processor CPU, and flue detects control circuit and comprises the one or three end power supply (V1), first integrated operational amplifier (U17A), second integrated operational amplifier (U17B), first resistance (R63), second resistance (R64), the 3rd resistance (R65), the 4th resistance (R66), the 5th resistance (R67), the 6th resistance (R73), the 7th resistance (R72), the 8th resistance (R74), the 9th resistance (R75), the tenth resistance (R85), first electric capacity (C5), second electric capacity (C13), the 3rd electric capacity (C14), the 4th electric capacity (C18), the 5th electric capacity (C19), the 6th electric capacity (C20), first diode (D24), second diode (D25), first potentiometer (VR1), second potentiometer (VR2), electrochemical capacitor (E8), wherein; 1 foot one of the one or three end power supply (V1) is to link to each other with 2 foots of the one or three end power supply (V1) through the 7th resistance (R72); 1 foot one of the one or three end power supply (V1) is to link to each other with movable contact 3 foots of first potentiometer (VR1), and stationary contact 1 foot of first potentiometer (VR1) is unsettled, and 2 foots one of first potentiometer (VR1) are to link to each other with 1 foot of the one or three end power supply (V1) through the tenth resistance (R85); The one, link to each other with 2 foots of the one or three end power supply (V1) through electrochemical capacitor (E8); 2 foots of first potentiometer (VR1) are ground connection also, and 2 foots one of the one or three end power supply (V1) are to link to each other with first integrated operational amplifier (U17A), are that first integrated operational amplifier (U17A) provides+the 6V power supply; 2 foots one of the one or three end power supply (V1) are to link to each other with an end of the 3rd electric capacity (C14); The other end one of the 3rd electric capacity (C14) is a ground connection, the one, link to each other with 3 foots of the one or three end power supply (V1) through second electric capacity (C13), and 3 foots of the one or three end power supply (V1) connect the 24V power supply; One end of first resistance (R63), the 6th resistance (R73) and the 4th electric capacity (C18) links to each other with central processor CPU; The equal ground connection of the other end of the 6th resistance (R73) and the 4th electric capacity (C18), the other end of first resistance (R63) links to each other with the input end in the same way of first integrated operational amplifier (U17A), and the reverse input end one of first integrated operational amplifier (U17A) is through second resistance (R64) ground connection; The one, link to each other through the output terminal of second potentiometer (VR2) with first integrated operational amplifier (U17A); The 5th electric capacity (C19) is attempted by the two ends of second potentiometer (VR2), and the output terminal of first integrated operational amplifier (U17A) links to each other with the reverse input end of second integrated operational amplifier (U17B) through the 4th resistance (R66), and the input end in the same way of second integrated operational amplifier (U17B) is through the 5th resistance (R67) ground connection; The one, be connected through the output terminal of the 3rd resistance (R65) with second integrated operational amplifier (U17B); The 6th electric capacity (C20) is attempted by the input end in the same way of second integrated operational amplifier (U17B) and the output terminal of second integrated operational amplifier (U17B), and the output terminal one of second integrated operational amplifier (U17B) is through the 9th resistance (R75) ground connection, and the one, (R74) links to each other with A/D converter through the 8th resistance.