CN108255112A - Nitrogen oxide sensor heating unit - Google Patents
Nitrogen oxide sensor heating unit Download PDFInfo
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- CN108255112A CN108255112A CN201810106549.7A CN201810106549A CN108255112A CN 108255112 A CN108255112 A CN 108255112A CN 201810106549 A CN201810106549 A CN 201810106549A CN 108255112 A CN108255112 A CN 108255112A
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 93
- 238000010438 heat treatment Methods 0.000 title claims abstract description 41
- 238000001514 detection method Methods 0.000 claims abstract description 36
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 13
- 230000003321 amplification Effects 0.000 claims abstract description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 239000011324 bead Substances 0.000 claims description 5
- 238000004088 simulation Methods 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 14
- 238000010586 diagram Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 238000013519 translation Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0073—Control unit therefor
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P.I., P.I.D.
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1917—Control of temperature characterised by the use of electric means using digital means
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21137—Analog to digital conversion, ADC, DAC
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25257—Microcontroller
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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Food Science & Technology (AREA)
- Combustion & Propulsion (AREA)
- Medicinal Chemistry (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Control Of Temperature (AREA)
Abstract
Technical field more particularly to a kind of nitrogen oxide sensor heating unit the present invention relates to nitrogen oxide sensor.Signal amplifying part divides the A/D conversion portions of connection microcontroller, the PWM that the TIM timer sections of microcontroller generate controls the constant current portion of connection heat driven module and voltage detection module simultaneously, voltage detection module and heat driven module connect the heating platinum resistance of nitrogen oxide sensor, the FSMC parts connection display module TFTLCD of microcontroller simultaneously.The design provides stable, constant current using voltage detection module is independent to heating platinum resistance, effectively differential amplification is carried out to the terminal voltage signal of platinum resistance simultaneously, and output voltage signal after reasonable amplification is supplied to micro controller module, inhibit the common-mode noise of signal, voltage signal signal-to-noise ratio is significantly improved, improves the precision of temperature survey.
Description
Technical field
The present invention relates to a kind of heating unit more particularly to a kind of nitrogen oxide sensor heating units.
Background technology
With the high speed development of world economy, Global Auto total amount persistently rises, and the development of auto industry is largely
The progress of human society is promoted, but due to the limitation of its power resources, also largely exacerbates environmental pollution and the energy
Shortage.Automobile nitrogen oxide sensor improves engine combustion performance, together by detecting in vehicle exhaust oxynitride concentration
When reduce pernicious gas discharge.
In order to realize the abundant use of fuel, raising fuel availability, while the discharge of oxynitrides in tail gas is reduced,
Need nitrogen oxide sensor oxynitride concentration in different air-fuel ratios measures tail gas in real time.In nitrogen oxide sensor work
During work, the real-time working temperature of nitrogen oxide sensor has decisive role to its measurement accuracy, accuracy etc..Therefore, it realizes
Accurately and fast control to nitrogen oxide sensor heating, on fine-tuning with extremely important influence for its temperature.
Invention content
Present invention seek to address that drawbacks described above, provides a kind of nitrogen oxide sensor heating unit.
In order to overcome defect present in background technology, the technical solution adopted by the present invention to solve the technical problems is：
This nitrogen oxide sensor heating unit includes micro controller module, heat driven module, voltage detection module and display module, electricity
Detection module is pressed to include signal amplifying part point and constant current portion, the micro controller module includes TIM timer sections, A/
D conversion portions and FSMC parts, signal amplifying part divide the A/D conversion portions of connection microcontroller, the TIM timers of microcontroller
The PWM that part generates controls the constant current portion of connection heat driven module and voltage detection module, voltage detecting mould simultaneously
Block and heat driven module connect the heating platinum resistance of nitrogen oxide sensor, the FSMC parts connection display module of microcontroller simultaneously
TFTLCD。
According to another embodiment of the invention, further comprise that the circuit composition of the heat driven module includes resistance
The pwm signal of R16 one end connection micro controller module output, the B poles of the other end connecting triode T1 of resistance R16, triode
The E poles connection simulation ground of T1, one end of the C poles connection resistance R14 of triode T1, the other end of resistance R14 simultaneously with capacitance C20
One end, one end of resistance R13, the anode of zener diode P_D2 and power MOS pipe Q1 the connection of G poles, power MOS pipe Q1
S poles connect 24V voltages, work(jointly with the cathode of the other end of capacitance C20, the other end of resistance R13, zener diode P_D2
The D poles connection heating platinum resistance of rate metal-oxide-semiconductor Q1.
According to another embodiment of the invention, further comprise that the circuit composition of the voltage detection module includes resistance
The pwm signal of one end connection micro controller module output of R33, one end of resistance R33 other ends connection resistance R19, resistance R19
Other end connecting triode T3 B poles, the E poles connection of triode T3 digitally, the C poles of triode T3 connection resistance R17's
One end, one end of resistance R18, the B poles of the other end connecting triode T2 of resistance R18, the C poles of triode T2 are with resistance R17's
The other end connects 24V supply voltages, one end of E poles connection resistance R20, one end of magnetic bead P_L4 and the constant current of triode T2 simultaneously
Source chip U4（LC1920）1 pin, the other end connection constant current source chip U4 of resistance R20（LC1920）3 pins and resistance
One end of R24, the other end connection constant current source chip U4 of resistance R24（LC1920）2,4 pins and output resistance R32, magnetic
One end of other end connection resistance R21 of pearl P_L4 and constant current source chip U3（LC1920）1 pin, the other end of resistance R21
Connect constant current source chip U3（LC1920）3 pins and resistance R25 one end, resistance R25 the other end connection constant current source chip
U3（LC1920）2,4 pins and output resistance R32.
According to another embodiment of the invention, further comprise that the signal is input to one end of resistance R12, resistance
One end of other end connection resistance R9 of R12 and 3 pins of amplifier U1A, the other end of resistance R9 and 4 pins of U1A connect
To digitally, one end of 2 pins connection resistance R11 of U1A and one end of resistance R10, the other end of resistance R11 connect number
Ground, 1 pin of output of the other end connection U1A of resistance R10, the 8 pins connection 3.3V power supplies of amplifier U1A.
The invention has the advantages that
（1）The micro-control module that the design uses（STM32）The functions such as high-speed clock signal, high-precision A/D acquisitions, energy can be provided
The temperature controlled precision of nitrogen oxide sensor and accuracy, the promptness of temperature feedback adjusting is effectively ensured.
（2）The design provides heating platinum resistance stable, constant current, while to platinum electricity using voltage detection module is independent
The terminal voltage signal of resistance carries out effectively differential amplification, and output voltage signal after reasonable amplification is supplied to microcontroller mould
Block, it is suppressed that the common-mode noise of signal significantly improves voltage signal signal-to-noise ratio, improves the precision of temperature survey；
（3）In addition, the temperature control of nitrogen oxide sensor is realized using PWM controls in the design, heating is made to be cut with the stabilization detected
It changes, while can accurately adjust heating time, heating frequency so that temperature controlled precision higher；
（4）The real-time voltage signal of acquisition is shown have preferable by nitrogen oxide sensor heating design with temperature by TFTLCD
Human-computer interaction function.
Description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the structure diagram that the present invention designs；
Fig. 2 is the operating diagram that the present invention designs；
Fig. 3 is heat driven module main circuit diagram；
Fig. 4 is voltage detection module current switch circuit figure.
Fig. 5 is that the signal amplifying part of voltage detection module divides U1A differential amplifier circuit figures.
Specific embodiment
If Fig. 1 is the structure diagram of the present invention, figure includes micro controller module, heat driven module, voltage detecting
Module and display module.The signal amplifying part of voltage detection module divides the A/D conversion portions of connection microcontroller, microcontroller
The PWM that TIM timer sections generate controls the constant current portion of heat driven module and voltage detection module, voltage inspection simultaneously
It surveys module and heat driven module connects the heating platinum resistance of nitrogen oxide sensor, the FSMC parts of microcontroller and display mould simultaneously
Block connects, and the flow direction of signal is as shown in Fig. 1 arrow directions.
Microcontroller（STM32F103 series）Module includes：
PWM is generated by the timer of STM32 itself（Pulse Width Modulation, pulse width modulation）Output, PWM
The parameters such as frequency, the duty ratio of output are adjustable；
The ADC of STM32（Analog-to-Digital Converter, analog-digital converter）Realize the electricity to voltage detection module
Pressure output carries out accurate number conversion, obtains real-time voltage value；
The A/D translation interfaces of STM32 are connect with voltage detection module, and PWM output interfaces and the heat driven module of STM32 connect
It connects, the FSMC interfaces of STM32 are connect with display module.
Microcontroller to A/D convert as a result, by corresponding operation, obtain corresponding temperature value；
Obtained voltage value, temperature value etc. are passed through the TFTLCD of itself FSMC Interface Controller by microcontroller（Thin Film
Transistor-Liquid Crystal Display, Thin Film Transistor-LCD）Display.
The A/D translation interfaces of STM32 are connect with voltage detection module, PWM output interfaces and the heat driven module of STM32
Connection, the FSMC interfaces of STM32 are connect with display module.
Heat driven module can recognize that the PWM outputs of micro controller module, and according to PWM frequency, duty ratios exported etc.
Parameter accurately adjusts heating cycle and heating time.
In order to realize real-time monitoring temperature, voltage detection module is worked at the same time with heat driven module, but is carried out at times
Input, the output of data.
Display module TFTLCD can show that the voltage value of real-time voltage detection module output and micro controller module are defeated simultaneously
The temperature value gone out.
Microcontroller mainly includes：
TIM timers：For generating while controlling the pwm signal of voltage detection module and heat driven module, frequency, duty ratio
Etc. parameters can fine-tune；
A/D is converted：For the output of receiving voltage detection module, there are more acquisition channels, 12 precision, meet design need
It asks；
FSMC interfaces：For connecting TFTLCD display screens.
As shown in Fig. 2, heater overall operation flow diagram.After heater heating starting, the initial of system is carried out first
To change, the heating and temperature feedback for then carrying out system are adjusted, meanwhile, the voltage signal for proceeding by sensor parts is adopted
Collection, at the same time, it is also necessary to carry out the display of data.During heter temperature is adjusted, recycle progress be real time temperature with
The comparison of set temperature if not up to setting value, carries out PID adjustings, is carried out at the same time data acquisition and is shown with data；If reach
Desired temperature then keeps Current Temperatures.In the different operating stage of nitrogen oxide sensor, the setting value of temperature can also become therewith
Change.The acquisition of this real time temperature and the continuous comparison with setting value realize the closed loop detection of system, adjust.Thus may be used
Know, it is synchronous progress that the heating of control system, information collection, data, which are shown, this has just fully ensured that the real-time of system.
Fig. 3-5 is main circuit design drawing in novel nitrogen oxide sensor heating design.
As shown in figure 3, for main heat driven circuit.In Fig. 3, resistance R16 one end connection micro controller module output
Pwm signal, the other end connection T1（NPN is managed）B poles.The E poles connection simulation ground of T1, the C poles connection resistance R14 of T1.Resistance
The other end of R14, while connect with the G poles of capacitance C20, resistance R13, zener diode P_D2 and power MOS pipe Q1.Q1's
S poles connect 24V voltages jointly with capacitance C20, resistance R13, zener diode P_D2.The D poles connection heating platinum resistance of Q1.Its
In, Q1 is P-channel power MOS pipe, and C20, R13 form discharge circuit, and zener diode is as protection circuit.When PWM outputs are low
During level, T1 is not turned on, and Q1 is also not turned on, without heating；When PWM exports high level, T1 conductings, Q1 is also open-minded, carries out
Heating.In heating process, it is only necessary to control the period of PWM and the time of low and high level, you can control the on, off of Q1
Time, so as to control the heating of platinum electrode.
Fig. 4 is the current switch circuit of current detection section.In Fig. 4, the pwm signal of microcontroller output is transferred to resistance
R33, resistance the R33 other end connection resistance R19.Resistance R19 connecting triodes T3（NPN is managed）B poles, T3 E poles connection number
Ground, C poles connection resistance R17, the resistance R18 of T3.The other end connecting triode T2 of resistance R18（NPN is managed）B poles.Meanwhile T2
C poles connect 24V supply voltages simultaneously with the other end of resistance R17.E poles connection resistance R20, the magnetic bead P_L4 of triode T2 and
Constant current source chip U4（LC1920）1 pin.The other end connection resistance R21 and constant current source chip U3 of magnetic bead P_L4（LC1920）
1 pin.U3 and resistance R20, resistance R24 form a constant-current circuit, provide the constant current of about 20mA；U4 and resistance R21,
Resistance R25 forms a constant-current circuit, provides the constant current of about 20mA.This two-part output connects sampling resistor simultaneously
The both ends of R32.
4 circuit of analysis chart it is found that when PWM output for low level when, triode T3 is not turned on, triode T2 conducting, U4 and
U3 works, the constant current of circuit output about 40mA；When PWM outputs is high level, triode T3 conductings, triode T2 is not led
Logical, U4 and U3 do not work, and circuit is without output.
It follows that heat driven circuit is completely opposite with the current switching portion working condition of voltage detection module.Cause
This, in order to avoid influence of the heater circuit for temperature detection, improves temperature control precision, in the design, heating and detection
It is parallel circuit, carries out at times, i.e., heater circuit is all connected to sensor heating line end with detection circuit.When control chip
When PWM is exported（PWM cycle is 10ms）, high level state, heater circuit conducting, detection circuit is not turned on, and realizes that sensor adds
Heat；Low level state, heater circuit are not turned on, and sensor temperature detection is realized in detection circuit conducting.Heater circuit turns off and inspection
Program time delay is designed between slowdown monitoring circuit conducting, ensures that system stablizes switching.
Fig. 5 is U1A differential amplifier circuits.In circuit design, signal is input to resistance R12, the other end connection of resistance R12
3 pins of resistance R9 and amplifier U1A.The other end of resistance R9 and 4 pins of U1A are connected to digitally.2 pins of U1A connect
Connecting resistance R11 and resistance R10.Digitally, the output 1 of the other end connection U1A of resistance R10 is managed for the other end connection of resistance R11
Foot.The 8 pins connection 3.3V power supplies of amplifier U1A.
It, can be in a certain range by the resistance value size of regulation resistance R11 and resistance R10 in this section in amplifying circuit
It is interior, the arbitrary amplification factor for adjusting amplifying circuit.Meanwhile the resistance value of build-out resistor R12 and resistance R9 are needed, so as to fulfill difference
Amplification.The utilization of differential amplifier circuit restrained effectively common-mode signal, amplifies difference mode signal, significantly reduces noise
It influences, improves the signal-to-noise ratio of circuit.
Meanwhile it will be noted that heating part ground wire need with signal amplifying part divide ground wire be isolated, avoid ground
Interference of the line to signal reduces system noise, improves signal-to-noise ratio.
Heat driven circuit is required to connect the heating platinum resistance of nitrogen oxide sensor with voltage detecting circuit, for according to temperature
Degree control signal control heater.
Based on the new design, voltage detection module realizes the signal acquisition to nitrogen oxide sensor, instead of based on general
The signal acquisition circuit that separating component is formed, microcontroller then only need to receive module acquisition internal resistance measurement voltage signal,
Corresponding calculation process is carried out, realizes and the closed loop of nitrogen oxide sensor temperature is accurately controlled.Therefore, based on designed by the present invention
Nitrogen oxide sensor heating design simplifies the control of the signal acquisition and temperature of nitrogen oxide sensor, improves nitrogen oxide sensor heating
The temperature control energy and accuracy of detection of system.
Described above to be merely exemplary for the purpose of the present invention, and not restrictive, those of ordinary skill in the art understand,
In the case where not departing from spirit and scope as defined in the appended claims, many modifications, variation or equivalent can be made, but all
It will fall within the scope of protection of the present invention.
Claims (4)
1. a kind of nitrogen oxide sensor heating unit, including micro controller module, heat driven module, voltage detection module and display
Module, it is characterised in that：The voltage detection module includes signal amplifying part point and constant current portion, the microcontroller mould
Block includes TIM timer sections, A/D conversion portions and FSMC parts, and signal amplifying part divides the A/D converter sections of connection microcontroller
Point, the PWM that the TIM timer sections of microcontroller generate controls the perseverance for connecting heat driven module and voltage detection module simultaneously
Constant current part, voltage detection module and heat driven module connect the heating platinum resistance of nitrogen oxide sensor, microcontroller simultaneously
FSMC parts connection display module TFTLCD.
2. nitrogen oxide sensor heating unit as described in claim 1, it is characterised in that：The circuit group of the heat driven module
Into the pwm signal for including resistance R16 one end connection micro controller module output, the B of the other end connecting triode T1 of resistance R16
Pole, the E poles connection simulation ground of triode T1, one end of the C poles connection resistance R14 of triode T1, the other end of resistance R14 is simultaneously
It is connect with the G poles of one end of capacitance C20, one end of resistance R13, the anode of zener diode P_D2 and power MOS pipe Q1, work(
The S poles of rate metal-oxide-semiconductor Q1 are connect jointly with the cathode of the other end of capacitance C20, the other end of resistance R13, zener diode P_D2
24V voltages, the D poles connection heating platinum resistance of power MOS pipe Q1.
3. nitrogen oxide sensor heating unit as described in claim 1, it is characterised in that：The circuit group of the voltage detection module
Into the pwm signal of one end connection micro controller module output including resistance R33, the resistance R33 other ends connect the one of resistance R19
End, the B poles of the other end connecting triode T3 of resistance R19, digitally, the C poles of triode T3 connect for the E poles connection of triode T3
One end of resistance R17, one end of resistance R18, the B poles of the other end connecting triode T2 of resistance R18, the C poles of triode T2 with
The other end of resistance R17 connects 24V supply voltages simultaneously, one end of the E poles connection resistance R20 of triode T2, magnetic bead P_L4
One end and constant current source chip U4（LC1920）1 pin, the other end connection constant current source chip U4 of resistance R20（LC1920）3
One end of pin and resistance R24, the other end connection constant current source chip U4 of resistance R24（LC1920）2,4 pins and output
One end of other end connection resistance R21 of resistance R32, magnetic bead P_L4 and constant current source chip U3（LC1920）1 pin, resistance
The other end connection constant current source chip U3 of R21（LC1920）3 pins and resistance R25 one end, resistance R25 the other end connection
Constant current source chip U3（LC1920）2,4 pins and output resistance R32.
4. nitrogen oxide sensor heating unit as described in claim 1, it is characterised in that：The signal of the voltage detection module is put
Most circuit includes one end that signal is input to resistance R12, one end of the other end connection resistance R9 of resistance R12 and amplification
3 pins of device U1A, the other end of resistance R9 and 4 pins of U1A are connected to digitally, and the one of the 2 pins connection resistance R11 of U1A
End and one end of resistance R10, digitally, the output 1 of the other end connection U1A of resistance R10 is managed for the other end connection of resistance R11
Foot, the 8 pins connection 3.3V power supplies of amplifier U1A.
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| CN201810106549.7A CN108255112A (en) | 2018-02-02 | 2018-02-02 | Nitrogen oxide sensor heating unit |
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| CN201810106549.7A CN108255112A (en) | 2018-02-02 | 2018-02-02 | Nitrogen oxide sensor heating unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110735699A (en) * | 2019-10-23 | 2020-01-31 | 华中科技大学 | controller for nitrogen oxide sensor |
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| CN204650321U (en) * | 2015-06-04 | 2015-09-16 | 西安创联电气科技（集团）有限责任公司 | The heating control apparatus of NOx sensor |
| CN105892529A (en) * | 2016-06-12 | 2016-08-24 | 上海感先汽车传感器有限公司 | Heating control circuit for nitrogen oxygen sensor and method |
| CN107453193A (en) * | 2017-09-21 | 2017-12-08 | 中国科学院长春光学精密机械与物理研究所 | The high efficiency temperature controlled circuit of laser based on thermoelectric cooling |
| CN207937811U (en) * | 2018-02-02 | 2018-10-02 | 常州联德电子有限公司 | Nitrogen oxide sensor heating device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110735699A (en) * | 2019-10-23 | 2020-01-31 | 华中科技大学 | controller for nitrogen oxide sensor |
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