CN109738108A - A kind of automobile-used resistance-type baroceptor and its working method - Google Patents
A kind of automobile-used resistance-type baroceptor and its working method Download PDFInfo
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- CN109738108A CN109738108A CN201910012584.7A CN201910012584A CN109738108A CN 109738108 A CN109738108 A CN 109738108A CN 201910012584 A CN201910012584 A CN 201910012584A CN 109738108 A CN109738108 A CN 109738108A
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Abstract
The invention discloses a kind of automobile-used resistance-type baroceptors, including Hall pressure sensor, backward voltage amplifier, non-linear compensation circuit, variable resistance output circuit.When air pressure changes, when elastic element generates displacement in sensor, Hall element will be driven to move in the magnetic field with uniform gradient, to generate Hall voltage, it completes pressure alteration to be voltage signal output, and the backward voltage amplifier that is powered obtains a negative pressure output, after being compensated by non-linear compensation circuit, variable resistance output circuit is driven, an artifical resistance signal is exported；The present invention is when braking system air pressure changes, Hall element displacement is driven by the displacement of elastic element in sensor, generate a voltage, the voltage of output is passed through after signal condition and after carrying out compensation accordingly, drive monopole type field-effect tube, so that equivalent resistance of the work between the drain-source of the field-effect tube in variable resistance area is changed, is finally completed resistance simulation function.
Description
Technical field
The invention belongs to automobile technical fields, are related to a kind of automobile sensor, specifically a kind of automobile-used resistance-type air pressure transmission
Sensor.
Background technique
Currently, the pressure sensor overwhelming majority for being applied to brake system of car barometric surveying is all using resistance-strain type
Baroceptor, resistance strain type pressure sensor are also known as solid state pressure sensor, and pressure sensor is mainly by being fixed on silicon
Silicon cup diaphragm and shell composition, the upper and lower of silicon diaphragm on cup have low pressure chamber and high pressure chest, tested by silicon diaphragm direct feeling
Pressure, silicon diaphragm is pressure piping with tested pressure communication on one side, and another side is low pressure chamber.Low pressure chamber is communicated with atmosphere.
Under by measuring pressure or differential pressure effect, silicon diaphragm generates strain, and the resistance value of diffusion resistance changes with strain.Its advantage is that precision
Height, measurement range is wide, and long service life, structure is simple, it the shortcomings that be for having strained biggish non-linear, output signal greatly
Weaker, in more demanding measurement occasion, there is the signal of output certain non-linear and hysteresis quality to affect sensor just
It is often used, and the consistency of sensor is poor, the unfavorable factors such as higher cost.
Summary of the invention
In order to overcome above-mentioned technical problem, the purpose of the present invention is to provide a kind of automobile-used resistance-type baroceptor,
When brake system of car air pressure changes, when elastic element generates displacement in sensor, Hall element will be driven to have
It is moved in the magnetic field of uniform gradient, to generate Hall voltage, completes pressure alteration to be voltage signal output, and it is reversed to be powered
Voltage amplifier obtains a negative pressure output, after being compensated by non-linear compensation circuit, drives variable resistance output circuit, defeated
An artifical resistance signal out reflects current air pressure change.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of automobile-used resistance-type baroceptor, including air pressure detecting unit, backward voltage amplifier, nonlinear compensation electricity
Road and variable resistance output circuit；
The air pressure detecting unit is connected with backward voltage amplifier, exports a negative pressure by backward voltage amplifier
Signal；
The backward voltage amplifier is connected with non-linear compensation circuit, non-thread for compensating variable resistance output circuit
Property degree, improve resistance both end voltage dynamic range；
The non-linear compensation circuit is connected with variable resistance output circuit, when the output voltage of non-linear compensation circuit
When changing, corresponding change occurs for the loop resistance of variable resistance output circuit.
Further, the air pressure detecting unit is Hall chip pressure sensor, and the air pressure detecting unit is using suddenly
The displacement of the elastic element as caused by pressure is converted into Hall voltage by that element, to realize the measurement of pressure；
When air pressure change, Hall pressure elements exports a weak voltage signals；It will by the backward voltage amplifier
Voltage of the Hall pressure sensor output greater than 0V amplifies, and is converted to one 0 to -5V voltage signal.
Further, the voltage signal of -5V to 0V of the backward voltage amplifier output is transferred to nonlinear compensation electricity
On the road；The non-linear compensation circuit includes that the voltage follower of two electric connections is connected and constitutes, the non-linear benefit
Circuit is repaid for adapting to the voltage dynamic range at simulation output resistance both ends.
Further, the variable resistance output circuit is a series connection junction field effect transistor output circuit, is passed through
Change gate source voltage VGSSize come change series connection junction field effect transistor drain-source between equivalent resistance, by non-thread defeated compensation
One variable voltage of circuit output, to reach accurate control output resistance.
A kind of working method of automobile-used resistance-type baroceptor, this method comprises the following steps:
Step 1: when air pressure changes, elastic element is experienced pressure and is subjected to displacement in sensor, and by pressure conversion
For displacement, Hall element is fixed on elastic element, when elastic element generates displacement, Hall element is driven to have
It is moved in the magnetic field of even gradient, to generate Hall voltage, realizes the process by pressure alteration for voltage change.Hall pressure member
Part exports a weak voltage signals, which is the voltage of 0V or more, and voltage value is increased with it with the increase of pressure；
Step 2: the positive value voltage signal of Hall element output is carried out Hall voltage instead by a sign-changing amplifier
To amplification, the voltage signal an of -5V to 0V is obtained, which is connected with two voltage followers, constitutes non-linear
Compensation circuit, to adapt to the voltage dynamic range at simulation output resistance both ends；
Step 3: the voltage-drop loading of voltage follower output to artifical resistance output circuit, artifical resistance output circuit by
One series connection junction field effect transistor output circuit composition, by changing gate source voltage VGSSize is imitated to change series connection junction type field
The equivalent resistance between transistor drain-source is answered, and is compensated by non-thread defeated compensation circuit, to improve artifical resistance both end voltage
Dynamic range realizes accurate control output resistance.
Beneficial effects of the present invention: the configuration of the present invention is simple, design are reasonable, when brake system of car air pressure changes,
Hall element displacement is driven by the displacement of elastic element in sensor, a voltage is generated, the voltage of output is passed through into signal
It after conditioning and carries out after compensating accordingly, drives monopole type field-effect tube, make field-effect tube of the work in variable resistance area
Equivalent resistance between drain-source changes, and is finally completed resistance simulation function.Output voltage and air pressure due to Hall element
The linear corresponding relationship of pressure, polar form field-effect pipe work in variable resistance area, the linearity is higher, the output of sensor
Precision and sensitivity are higher, more can really reflect actual pressure value, and product can realize micromation, highly integrated, Gao Ling
Sensitivity, temperature tolerance are preferable.Sensor has overall structure secured, and small in size, light-weight, the service life is long, easy for installation, small power consumption,
The advantages that frequency is high, vibration resistance, by corresponding optimization design, can be widely used in space flight, aviation, petrochemical industry, power
The fields such as machinery, biomedical engineering, meteorology, geology, work measurement.
Detailed description of the invention
In order to facilitate the understanding of those skilled in the art, the present invention will be further described below with reference to the drawings.
Fig. 1 is a kind of structural block diagram of automobile-used resistance-type baroceptor of the present invention；
Fig. 2 is a kind of Hall sensor schematic diagram of automobile-used resistance-type baroceptor of the present invention；
Fig. 3 is a kind of variable resistance output circuit schematic diagram of automobile-used resistance-type baroceptor of the present invention；
Fig. 4 is a kind of working principle diagram of automobile-used resistance-type baroceptor of the present invention.
Specific embodiment
As shown in Figure 1, the present invention is a kind of automobile-used resistance-type baroceptor, including Hall pressure sensor, reversed electricity
Press amplifier, non-linear compensation circuit, variable resistance output circuit；
The Hall type pressrue transducer is the Hall effect using material, by the pressure conversion of impression at variable electricity
Press the sensor of signal output.Its working principle is as shown in Fig. 2, Hall plate is thin slice made of semiconductor material, when there is pressure
When power generates, the displacement of the elastic element as caused by pressure, when electronics moves in Hall plate, due to the work by electromagnetic force
With, and the tracks of electronics is made to shift, cause have electron accumulation on an end face of Hall plate, on another end face just
Charge excess, then appearance potential is poor on Hall plate, this potential difference is known as Hall voltage, permanent by applying to Hall element
Fixed electric current simultaneously remains unchanged, then in uniform magnetic field, displacement locating for Hall element is different, suffered magnetic induction intensity
Will be different, it can be obtained by the Hall voltage proportional to displacement in this way.Realize the linear transformation for being displaced to potential.I.e. pressure becomes
Change the process for being changed into output voltage variation.
The variable resistance output circuit of baroceptor is as shown in figure 3, variable resistance output circuit uses a unipolarity
Junction field effect transistor, junction field effect transistor have 3 workspaces, and variable resistance area, pinch off region and constant current area work as junction type
As long as field effect transistor is met
VGS>VGS(off), | VDS|<VGS-VGS(off)
When condition, it can work in variable resistance area.At this point, its drain current IDFor
Equivalent resistance between drain-source is RDS
In formula, K is the correspondence constant of unipolarity junction field effect transistor, VTIts approximate threshold values controls voltage.
Field effect transistor works at variable resistance area, as the V of inputGSWhen constant, RDSVoltage with voltage V increase
And increase, in order to make VDSThe voltage dynamic range at both ends is stablized, and a resistance R is sealed in this programme, to improve variable resistance
System performance.
As shown in figure 4, Hall pressure elements output voltage variation range is smaller, when brake system of car air pressure is lower,
The weak voltage signals of output are not enough to drive late-class circuit, and rear class variable resistance output circuit is a junction field crystalline substance
Body pipe, driving voltage realize the function of thyrite, Hall pressure elements is defeated by controlling gate source voltage for negative pressure driving
Voltage is the voltage of 0V or more out, and voltage value is increased with it with the increase of pressure.A reversed electricity is used in this programme
Device UA is pressed, while Hall pressure elements output voltage is entered amplification, changes its output polarity, becomes negative pressure output,
It is input to the input terminal of voltage follower UB.
As shown in figure 4, a non-linear compensation circuit is in series with, by operation amplifier in the output circuit of variable resistance
The voltage follower UB and UC that device is constituted, in order to improve the non-linear behaviour of field-effect tube variable resistance, core is to eliminate
When grid voltage changes to RDSInfluence, the variation of RDS is by VDSIncrease and increase, R3 in Fig. 4, R4 is equal, field-effect tube
Source electrode ground connection, according to principle of stacking, then V when a littleGSVoltage:
At this point, grid current is smaller, it can be ignored, then grid voltage is relative constant
VinFor input voltage, then drain-source resistance is
Then RDSVariation not by VDSIt influences, eliminates nonlinear problem, meanwhile, in order to extend variable resistance RDSRange,
This programme additionally uses the mode of series connection output, and two monopole type field-effect tube are connected, and equivalent output resistance is field
The drain electrode of effect pipe J1 and the resistance at J2 source electrode both ends, extend the dynamic range of its output resistance.
A kind of working method of automobile-used resistance-type baroceptor, includes the following steps:
Step 1: when brake system of car air pressure changes, elastic element is experienced pressure change and is sent out in sensor
Raw displacement, and be linear displacement amount by pressure conversion, Hall element is fixed on elastic element, when elastic element generates displacement
When, it drives Hall element to move in the magnetic field with uniform gradient, to generate Hall voltage, realizes that by pressure alteration be electricity
The process of buckling.Hall pressure elements exports a weak voltage signals, and pressure is bigger, and output potential is bigger, which is
The voltage of 0V or more, voltage value are increased with it with the increase of pressure.
Step 2: the positive value voltage signal of Hall element output passes through one due to the potential difference very little that Hall element generates
A sign-changing amplifier is amplified Hall voltage signal is inputted, and anti-phase output, and the size of output voltage depends on resistance R1,
The proportionate relationship of R3, by changing R3, the resistance ratio of R1 finally obtains the negative voltage signal between one 0 to -5V, can
The simulation output end of power transformation resistance, works as VGSWhen constant, RDSWith VDSIncrease and increase, become the non-linear behaviour of field-effect control
Difference, in order to improve the non-linear behaviour of field-effect tube variable resistance, core is eliminated when grid voltage changes to RDS's
It influences, the variation of RDS is by VDSIncrease and increase, the voltage of input is carried out by current limliting and partial pressure by a voltage follower,
The R3 in Fig. 4, R4 is equal, the source electrode of field-effect tube ground connection, according to principle of stacking, then V at this timeGSVoltage is lower, and grid current subtracts
Small, then grid voltage is due to VDSSuperposition and relative constant, RDSVariation not by VDSIt influences, eliminates nonlinear problem, with suitable
Answer the voltage dynamic range at simulation output resistance both ends.
Step 3: the voltage-drop loading of voltage follower output is to artifical resistance output circuit, in order to extend variable resistance RDS
Range, this programme additionally uses the mode of series connection output, two monopole type field-effect tube connected, and equivalent output is electric
The drain electrode and the resistance at J2 source electrode both ends that resistance is field-effect tube J1, by changing gate source voltage VGSSize come change series connection JFET
Equivalent resistance between drain-source, and compensated by non-thread defeated compensation circuit, to improve artifical resistance both end voltage dynamic model
It encloses, realizes accurate control output resistance, extend the dynamic range of its output resistance.
The configuration of the present invention is simple, design rationally, when brake system of car air pressure changes, pass through elasticity member in sensor
The displacement of part drives Hall element displacement, generates a voltage, by the voltage of output by after signal condition and carrying out corresponding
After compensation, monopole type field-effect tube is driven, equivalent resistance of the work between the drain-source of the field-effect tube in variable resistance area is made
It changes, is finally completed resistance simulation function.Due to the output voltage of Hall element and the linear corresponding pass of the pressure of air pressure
System, polar form field-effect pipe work in variable resistance area, and the linearity is higher, and the output accuracy of sensor and sensitivity are higher,
Actual pressure value more can be really reflected, product can realize that micromation, highly integrated, highly sensitive, temperature tolerance is preferable.It passes
Sensor has overall structure secured, and small in size, light-weight, the service life is long, easy for installation, small power consumption, and frequency is high, and vibration resistance etc. is excellent
Point, by corresponding optimization design, can be widely used in space flight, aviation, petrochemical industry, dynamic power machine, biomedical engineering,
The fields such as meteorology, geology, work measurement.
Above content is only to structure of the invention example and explanation, affiliated those skilled in the art couple
Described specific embodiment does various modifications or additions or is substituted in a similar manner, without departing from invention
Structure or beyond the scope defined by this claim, is within the scope of protection of the invention.
Claims (5)
1. a kind of automobile-used resistance-type baroceptor, which is characterized in that including air pressure detecting unit, backward voltage amplifier, non-
Linear compensation circuit and variable resistance output circuit；
The air pressure detecting unit is connected with backward voltage amplifier, exports a negative pressure letter by backward voltage amplifier
Number；
The backward voltage amplifier is connected with non-linear compensation circuit, non-linear for compensating variable resistance output circuit
Degree improves resistance both end voltage dynamic range；
The non-linear compensation circuit is connected with variable resistance output circuit, when the output voltage of non-linear compensation circuit occurs
When variation, corresponding change occurs for the loop resistance of variable resistance output circuit.
2. a kind of automobile-used resistance-type baroceptor according to claim 1, which is characterized in that the air pressure detecting unit
For Hall chip pressure sensor, the air pressure detecting unit utilizes Hall element by the position of the elastic element as caused by pressure
Transfer changes Hall voltage into, to realize the measurement of pressure；
When air pressure change, Hall pressure elements exports a weak voltage signals；By the backward voltage amplifier by Hall
Voltage of the pressure sensor output greater than 0V amplifies, and is converted to one 0 to -5V voltage signal.
3. a kind of automobile-used resistance-type baroceptor according to claim 1, which is characterized in that the backward voltage amplification
The voltage signal of-the 5V to 0V of device output is transferred on non-linear compensation circuit；The non-linear compensation circuit includes two electricity
Property connection voltage follower be connected and constitute, the non-linear compensation circuit is used to adapt to the electricity at simulation output resistance both ends
Press dynamic range.
4. a kind of automobile-used resistance-type baroceptor according to claim 1, which is characterized in that the variable resistance output
Circuit is a series connection junction field effect transistor output circuit, by changing gate source voltage VGSSize come change series connection junction type field
Equivalent resistance between effect transistor drain-source exports a variable voltage by non-thread defeated compensation circuit, to reach accurate control
Output resistance processed.
5. a kind of working method of automobile-used resistance-type baroceptor, which is characterized in that this method comprises the following steps:
Step 1: when air pressure changes, elastic element is experienced pressure and is subjected to displacement in sensor, and is position by pressure conversion
Shifting amount, Hall element is fixed on elastic element, when elastic element generates displacement, Hall element is driven to have uniformly ladder
It is moved in the magnetic field of degree, to generate Hall voltage, realizes the process by pressure alteration for voltage change.Hall pressure elements is defeated
A weak voltage signals out, the voltage are the voltage of 0V or more, and voltage value is increased with it with the increase of pressure；
Step 2: the positive value voltage signal of Hall element output is reversely put Hall voltage by a sign-changing amplifier
Greatly, the voltage signal an of -5V to 0V is obtained, which is connected with two voltage followers, constitutes nonlinear compensation
Circuit, to adapt to the voltage dynamic range at simulation output resistance both ends；
Step 3: the voltage-drop loading of voltage follower output is to artifical resistance output circuit, and artifical resistance output circuit is by one
Junction field effect transistor output circuit of connecting forms, and passes through and changes gate source voltage VGSSize is brilliant to change series connection junction field
Equivalent resistance between body pipe drain-source, and compensated by non-thread defeated compensation circuit, to improve artifical resistance both end voltage dynamic
Range realizes accurate control output resistance.
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| CN201910012584.7A CN109738108B (en) | 2019-01-07 | 2019-01-07 | Vehicle resistance type air pressure sensor and working method thereof |
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| CN201910012584.7A CN109738108B (en) | 2019-01-07 | 2019-01-07 | Vehicle resistance type air pressure sensor and working method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112104205A (en) * | 2020-08-14 | 2020-12-18 | 西安工程大学 | Full-bridge inverter circuit grid driving circuit with midpoint voltage tracking function |
| CN113375853A (en) * | 2021-06-09 | 2021-09-10 | 上海钧嵌传感技术有限公司 | Air pressure sensor module and calibration method thereof |
| CN113494978A (en) * | 2020-04-08 | 2021-10-12 | 上海柯舜科技有限公司 | Oil-gas pressure measuring system and method based on Hall effect |
| CN115127720A (en) * | 2022-07-01 | 2022-09-30 | 北京善养健康科技有限公司 | Air pressure detection device and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1395310A (en) * | 2001-07-04 | 2003-02-05 | 三星电子株式会社 | Internal power supply for IC with temp. compensating pedestal generator |
| CN2802487Y (en) * | 2005-06-07 | 2006-08-02 | 潘堂平 | Vehicle gas pressure meter |
| CN101739051A (en) * | 2008-11-20 | 2010-06-16 | 上海华虹Nec电子有限公司 | Dynamic resistance-capacitance compensating device for bipolar low-pressure difference linear voltage regulator |
| CN101995903A (en) * | 2010-09-21 | 2011-03-30 | 上海大学 | Nonlinear function generator, function converter and universal linear corrector |
| CN102519660A (en) * | 2011-12-15 | 2012-06-27 | 武汉理工大学 | Spring tube digital compression gauge based on Hall effect |
-
2019
- 2019-01-07 CN CN201910012584.7A patent/CN109738108B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1395310A (en) * | 2001-07-04 | 2003-02-05 | 三星电子株式会社 | Internal power supply for IC with temp. compensating pedestal generator |
| CN2802487Y (en) * | 2005-06-07 | 2006-08-02 | 潘堂平 | Vehicle gas pressure meter |
| CN101739051A (en) * | 2008-11-20 | 2010-06-16 | 上海华虹Nec电子有限公司 | Dynamic resistance-capacitance compensating device for bipolar low-pressure difference linear voltage regulator |
| CN101995903A (en) * | 2010-09-21 | 2011-03-30 | 上海大学 | Nonlinear function generator, function converter and universal linear corrector |
| CN102519660A (en) * | 2011-12-15 | 2012-06-27 | 武汉理工大学 | Spring tube digital compression gauge based on Hall effect |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113494978A (en) * | 2020-04-08 | 2021-10-12 | 上海柯舜科技有限公司 | Oil-gas pressure measuring system and method based on Hall effect |
| CN112104205A (en) * | 2020-08-14 | 2020-12-18 | 西安工程大学 | Full-bridge inverter circuit grid driving circuit with midpoint voltage tracking function |
| CN113375853A (en) * | 2021-06-09 | 2021-09-10 | 上海钧嵌传感技术有限公司 | Air pressure sensor module and calibration method thereof |
| CN113375853B (en) * | 2021-06-09 | 2022-03-11 | 上海钧嵌传感技术有限公司 | Air pressure sensor module and calibration method thereof |
| CN115127720A (en) * | 2022-07-01 | 2022-09-30 | 北京善养健康科技有限公司 | Air pressure detection device and method |
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