CN204719462U - A kind of manifold pressure sensor microcomputer measuring and controlling plug-in card able to programme - Google Patents
A kind of manifold pressure sensor microcomputer measuring and controlling plug-in card able to programme Download PDFInfo
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- CN204719462U CN204719462U CN201520145296.6U CN201520145296U CN204719462U CN 204719462 U CN204719462 U CN 204719462U CN 201520145296 U CN201520145296 U CN 201520145296U CN 204719462 U CN204719462 U CN 204719462U
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Abstract
The utility model discloses a kind of manifold pressure sensor microcomputer measuring and controlling plug-in card able to programme, directly be inserted in the pci bus (1) of microcomputer, it is characterized in that: this plug-in card by pci bus interface (2), programmable parallel expansion interface (3), analog signals Survey control module (4), simulating signal input selection module (5), output switch parameter control module (6) totally five parts form; The bus signals of pci bus (1) comprises address/data multiplexing line AD31-0 (11), bus line command and byte and allows multiplexed signals CB/E3-0 (12), part control signal wire (13) and status signal lines (14); Interface conversion chip CH365 (21) connects into pci bus interface circuit (200), described interface conversion chip CH365 (21) is converted to the bus signals of pci bus (1) bus signals that data-signal (22) is separated with address signal, be used for controlling and being connected programmable parallel expansion interface (3), analog signals Survey control module (4), simulating signal input selection module (5), output switch parameter control module (6).The utility model realizes controlling sensor automatic Calibration, alleviates working strength, improves test and stated accuracy, accelerate scalar period and efficiency.
Description
Technical field
The present invention is used for micro computer and compensates and timing signal programmable vehicle manifold pressure sensor, to automatic measurement and the control of the working environment pressure and temperature of this sensor, relates to a kind of manifold pressure sensor microcomputer measuring and controlling plug-in card able to programme.
Background technology
Automobile inlet manifold pressure transducer is very important sensor in D type (speed density type) fuel injection system, and its effect converts the pressure change in inlet manifold to voltage signal.The air capacity entered in cylinder determined by vehicle-mounted control computer (ECU) according to this signal and engine speed, the load condition of reflection engine.Manifold pressure sensor to be calibrated is that a standard CMOS produced by Melexis company realizes and has the programmable integrated pressure sensor of MEMS micro mechanical technology.This sensor is made up of the analog signal link that can match with digital signal processor and built-in temperature sensor, its outside connected mode is identical, the pin connected only has three (Vdd (power supply), Vss (), Out (Signal transmissions)), there is a disposable programmable read only memory (OTP One Time Programmable ROM) inside.User can carry out programming operation to programming unit according to demand, is all undertaken by OUT pin its programming and demarcation.Storer contains 64 storage unit, i.e. 64 OTP registers.The content that register cell reads is electric current, and producer specifies to represent with logical zero lower than the electric current of 10mA, otherwise the electric current higher than 30mA represents with logical one.User can compensate this sensor and correct, correction result is obtained by inner OPT programming the calibration result meeting accuracy requirement, calibrated sensing overall performance meets the requirement of pressure transducer, and can eliminate the drift of temperature parameter, its output voltage is directly proportional to institute applied pressure.
Before this, the demarcation of this pressure transducer adopts manual control method to carry out programming to it to demarcate, and calibration process and method are:
1, pressure transducer to be calibrated is placed in an airtight container;
2, the pressure and temperature in inspection instrument, and according to calibration request, by regulating gas admittance valve, air outlet valve, vacuum valve, air compressor machine, heating device and fan in container, regulating the pressure and temperature in container, on Room-temperature low-pressure, normal temperature high voltage, high-temperature low-pressure, High Temperature High Pressure 4 points, adjust to the temperature and pressure value of setting respectively by artificial means;
3, with the pressure and temperature in the pressure transducer of standard and standard temperature sensor tracking measurement container;
4, the same force value that presses that the normal pressure of 4 points, temperature and the pressure transducer to be calibrated of not programming collect is sent to the PTC-04 programmable device that Melexis company provides;
5, PTC-04 programmable device is according to the difference between the normal pressure measured and the pressure of sensor measurement to be calibrated, by the computing of inside, generate for nursing one's health the parameter with compensating-pressure transducer, again these parameter values are loaded in the register in pressure transducer, thus change pressure transducer mapping algorithm (compensation), make its pressure alteration value close to actual pressure value;
6, to the voltage-pressure curve after compensation, evenly choose 5 points within the scope of it, force value in adjustment container arrives these spot pressures successively, the force value of measurement and standard of comparison force value and the sensor measurement after compensating, if the two error meets accuracy requirement, then control PTC-04 programmable device is programmed to pressure transducer, otherwise again compensates or be judged as substandard product.
Above 1 ~ 6 is the current staking-out work process to pressure transducer, and environment temperature, the pressure of whole process change by manual control.
Summary of the invention
The invention discloses a kind of manifold pressure sensor microcomputer measuring and controlling plug-in card able to programme, plug-in card is directly inserted in the pci bus of microcomputer, user can pass through this plug-in card, by microcomputer automatic control, computing machine automatic measurement and control was used by originally adopting manually operated 1 ~ 6 method to change into the demarcation of manifold pressure sensor able to programme, to its carry out programming demarcate, make manifold pressure sensor detection and calibration process microcomputer software control under automatically complete.
The technical solution used in the present invention comprises: a kind of manifold pressure sensor microcomputer measuring and controlling plug-in card able to programme, directly be inserted in the pci bus (1) of microcomputer, it is characterized in that: this plug-in card by pci bus interface (2), programmable parallel expansion interface (3), analog signals Survey control module (4), simulating signal input selection module (5), output switch parameter control module (6) totally five parts form; The bus signals of pci bus (1) comprises address/data multiplexing line AD31-0 (11), bus line command and byte and allows multiplexed signals CB/E3-0 (12), part control signal wire (13) and status signal lines (14); Interface conversion chip CH365 (21) connects into pci bus interface circuit (200), described interface conversion chip CH365 (21) is converted to the bus signals of pci bus (1) bus signals that data-signal (22) is separated with address signal, be used for controlling and being connected programmable parallel expansion interface (3), analog signals Survey control module (4), simulating signal input selection module (5), output switch parameter control module (6).
Further, described programmable parallel expansion interface (3) comprises programmable parallel mouth extended chip 8255 (31), described programmable parallel mouth extended chip 8255 (31) extends three-channel parallel expansion interface circuit (300), and a road is used for temperature adjusting control circuit output temperature control signal (32); One tunnel is used for carrying out temperature, pressure mould analog quantity A//D change after input signal (34); Also have a road interface to be used for carrying out the control cue (33) of each several part circuit specially, described three road signals connect each other form temperature, the control and measurement signalling channel of pressure carries out I/O control by microcomputor program.
Further, described analog signals Survey control module (4) comprises metering circuit (401), and described metering circuit (401) is used to measure by the self-test signal of the pressure and temperature in the manifold pressure sensor test container demarcated and plug-in card itself; Described metering circuit (401) is made up of A/D conversion chip ADS7085 (41), function generator ICL8038 (46) and simulating signal input selection circuit (5); Described ADS7085 (41) receives the simulating signal that simulating signal input selection circuit (5) is sent here, and is read by programmable parallel mouth extended chip 8255 after described simulating signal is converted to 16 position digital signals.
Further, described analog signals Survey control module (4) also comprises control circuit (402,404), described control circuit (402,404) is used for controlling the well heater in container, and described control circuit (402,404) is made up of microprocessor AT89C2051 (42), pulse width modulating signal (43), D/A converter control signal (44) and D/A converter TLC5617 (45); Microprocessor AT89C2051 (42) produces according to the intensification instruction that microcomputer is sent here the speed that pulse width modulating signal controls the intensification of vessel in heating device, controls D/A converter export different analog voltage signals according to the difference of heating target.
Further, described simulating signal input selection module (5) is used for selecting different simulating signal input channel, and described simulating signal input selection module (5) selects output signal (55) to form by the temperature-voltage input signal (53) that analog switch MAX309 (51), manifold pressure sensor demarcate the pressure-voltage input signal (52) of container, manifold pressure sensor demarcates container, plug-in card self-inspection input signal (54), analog quantity; Simulating signal input selection circuit (500) comprises described simulating signal input selection module (5) and controls cue (33), described simulating signal input selection circuit (500) is controlled by microcomputor program, realizes from three road input signals, select a road to deliver to ADS7085 (41) as output and carries out changing and measuring.
Further, described output switch parameter control module (6) is used for output 8 way switch amount control signal, described output switch parameter control module (6) exports control signal (62) by 8D latch 74373 (61) and 8 tunnel and form, and described 8 tunnels export control signal (62) and control the large gas admittance valve in the demarcation hermatic door switch of container and container, little gas admittance valve, greatly air outlet valve, little air outlet valve, vacuum valve, compressor, electric fan 8 control objects respectively; Output switch parameter control module (600) comprises described output switch parameter control module (6).
Further, this plug-in card produces outside manifold pressure sensor test and the various measuring control signals demarcating container, by signal connector (700), realize the transmission of plug-in card and external signal, this plug-in card uses the 25D type socket of standard, as the connector of the various output of plug-in card, input signal, described signal comprises 8 way switch amount output signals, container pressure-current input signal, vessel temp-thermal resistance input signal, PWM output signal, D/A converted output signal.
Further, this plug-in card adopts the thick two-sided copper foil plate of 2.5mm to make microcomputer PCI bus plug-in card form.
The measurement of manifold pressure sensor able to programme and demarcation are the adjustment and the measurement that adopt manual type to carry out pressure and temperature in container before this, to programming data also by manually inputting PTC-04 programmable device, control procedure very complicated, control and the nominal time longer, the precision that parameter regulates is difficult to balanced guarantee.The present invention changes original measurement and demarcation mode, become from the method for manually carrying out regulating and measuring and undertaken regulating and measuring by microcomputer automatic control, and send programmable device to after measurement data is processed automatically, alleviate working strength, improve test and stated accuracy, accelerate scalar period and efficiency.This plug-in card realizes the basic element of character that microcomputer automatically measures manifold pressure sensor able to programme and demarcate, this plug-in card is inserted at microcomputer PCI bus, carry out microcomputor program control, just can realize automatically controlling manifold pressure sensor test able to programme, compensation and the whole of demarcation.
Accompanying drawing explanation
Fig. 1 is manifold pressure sensor microcomputer measuring and controlling plug-in card theory diagram able to programme;
Fig. 2 is manifold pressure sensor microcomputer measuring and controlling card insertion circuit schematic diagram able to programme.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
1, Fig. 1 is card plugging structure, this plug-in card directly inserts microcomputer PCI bus, by pci bus interface (2), programmable parallel expansion interface (3), analog signals Survey control module (4), simulating signal input selection module (5), output switch parameter control module (6) totally five parts form.Because there has been this plug-in card, achieve full automatic calibration with microcomputer to the manifold pressure sensor able to programme putting into container to control, the process of demarcating is: the control signal of microcomputer sends programmable parallel expansion interface to by pci bus interface, analog signals Survey control module is sent to respectively again by its different control signal, simulating signal input selection module and output switch parameter control module, each module is according to the control signal received, the execution unit of Work container is controlled, normal pressure simultaneously in collecting work container, temperature signal sends microcomputer to and processes, the process that whole control is demarcated, according in " background technology " 2 to 6 order realize microcomputer automatic control.Fig. 2 is the side circuit principle of the plug-in card of the present invention, uses and specific descriptions have all been made in parameter, the connection of circuit, the transmission of signal to the components and parts of each several part circuit of Fig. 1 block diagram.By the embodiment of accompanying drawings with this explanation, as long as one of ordinary skill in the art is shone and to be done, just goal of the invention can be realized: by this plug-in card, connected with computer and staking-out work container, transmit microcomputer control signal, gather and conversion bins in pressure, temperature signal, realize the Automatic Control to manifold pressure sensor calibration process able to programme.Below functions and relation thereof are specifically described.
2, pci bus adopts the bus of 32bit@33MHz, and the bus signals that this plug-in card uses comprises: address/data multiplexing line AD31-0, bus line command and byte allow multiplexed signals CB/E3-0, part control signal wire and status signal lines.
3, pci bus interface uses interface conversion chip CH365 to connect into pci bus interface circuit, with it, pci bus signal is converted to the bus signals that data-signal is separated with address signal, is used for controlling and being connected programmable parallel expansion interface, analog signals circuit of measurement and control, simulating signal input selection circuit, output switch parameter control circuit.Data bus and each several part circuit data connection, address wire selects signal as the address decoding of each several part module.
4, programmable parallel expansion interface programmable parallel mouth extended chip 8255A extends three-channel parallel interface, with PA mouth to temperature adjusting control circuit output temperature control signal; With PA, PB mouth as the input signal after the A//D conversions such as temperature measured in container, pressure; The control that PC mouth is used for carrying out each several part circuit is specially got in touch with, and this three roads signal can carry out I/O control by microcomputor program.
5, analog signals Survey control module comprises metering circuit and control circuit two part.
Metering circuit is used to measure by the self-test signal of the pressure and temperature in the manifold pressure sensor test container demarcated and plug-in card itself.Circuit is made up of A/D conversion chip ADS7085, function generator ICL8038 and simulating signal input selection circuit.ADS7085 receives the simulating signal (temperature, pressure, self-inspection) that simulating signal input selection circuit is sent here, and it is converted to 16 position digital signals, is read by 8255 by microcomputer.According to the circuit parameter calculation of actual design, the measurement fundamental error of this plug-in card to pressure reaches 0.0054%, reaches 0.01527% to the measurement fundamental error of temperature, all much smaller than 0.1%, meets the accuracy requirement of 0.1 grade to manifold pressure sensor timing signal.
Control circuit is used to control the well heater in container, and circuit is made up of microprocessor AT89C2051, pulse-length modulation (PWM) signal, D/A converter control signal and D/A converter TLC5617.Wherein, the intensification instruction that single-chip microcomputer is sent here according to microcomputer, produces pwm signal, controls the speed that vessel in heating device heats up; According to the difference of well heater object, also can control D/A converter and export controllable voltage, then produce transformable 4-20mA current signal through V/I translation circuit and carry out computer heating control.
6, simulating signal input selection module is used for selecting different simulating signal input channels, it turns voltage input signal by analog switch MAX309, the manifold pressure sensor pressure demarcated in container, the manifold pressure sensor temperature of demarcating in container turns voltage input signal, plug-in card self-inspection input signal and analog quantity and selects output signal to form, controlled by microcomputor program, from three road input signals, select a road to deliver to ADS7085 as output, after carrying out A/D conversion, become the digital signal that microcomputer can directly process.
7, output switch parameter control module is used for output 8 way switch amount control signal, and it exports control signal by 8D latch 74373 and 8 tunnel and forms.8 tunnel control signals control to demarcate the large gas admittance valve in the door switch of container and container, little gas admittance valve, large air outlet valve, little air outlet valve, vacuum valve, compressor, electric fan totally 8 control objects respectively.Door switch controls the sealing of container and opens; Air valve and vacuum valve control air pressure size in container; Cooling in compressor control container, electric fan impels homogeneous temperature in container.
8, this plug-in card produces outside manifold pressure sensor test and the various measuring control signals demarcating container, realized the transmission of plug-in card and external signal by the connector 25D type socket of standard, these signals comprise 8 way switch amount output signals, container pressure-current input signal, vessel temp-thermal resistance input signal, PWM output signal, D/A converted output signal.
Embodiment 1:PCI interface is selected the decoding of each module's address of plug-in card
The pci interface (2) of Fig. 1, pci bus interface circuit (200) is connected into by interface conversion chip CH365 (21), it is converted to pci bus (1) signal the bus signals that data-signal (22) is separated with address signal A15-A0, be used for controlling and being connected programmable parallel expansion interface (3), analog signals Survey control module (4), simulating signal input selection module (5), output switch parameter control module (6).
Signal after pci bus interface circuit (200) conversion in fig. 2 mainly contains: data bus D7-D0; Address bus A15-A0; Control signal/IOP_WR (IO writes) ,/IOP_RD (IO reads) ,/MEM_WR (storer is write) ,/MEM_RD (storer is read).Address " line decoding " is adopted to carry out the different module work of gating in plug-in card: A12 chooses simulating signal input selection circuit (500), A13 chooses switching value output circuit (600), A14 chooses A/D change-over circuit (401), A15 chooses parallel-expansion interface circuit (300).Accordingly, the operation that computer program carries out each module by different addresses controls.
Embodiment 2: parallel-expansion interface circuit is to plug-in card Function Extension
Parallel-expansion interface circuit (300) is used to the expanded function realizing multi-signal input, export, the extension of parallel port chip 8255A (31) is chosen by the address wire A15 of PC bus interface circuit (200), controls read-write by/IOP_RD ,/IOP_WR signal.The data bus of its data line D7-D0 with CH365 is connected, and the function that PA, PB, PC tri-parallel ports of expansion realize respectively is:
PA mouth: timesharing, as the input and output passage of data, is the least-significant byte of input A/D transformation result during input, output transmits container intensification order and PWM control data by 8D latch U13 to single chip computer AT C89C2051
PB mouth: only as the input channel of data, is used for inputting the most-significant byte of A/D transformation result.
PC mouth: 8 leg signal respectively as the contact control signal of each circuit devcie, wherein: PC0-is for subsequent use; PC1-sends out interruption to single chip computer AT C89C2051, request msg transmission; PC2-single chip computer AT C89C2051 resets control; PC3-U13 latches controls; PC4-U6 latches allows to control; The A0 pin of PC5-analog switch MAX309; The A1 pin of PC6-analog switch MAX309; The enable control of PC7-analog switch MAX309.
Embodiment 3: to the adjustment of pressure in container
In container, the adjustment of pressure is after closing containers hermatic door, by pressure survey, measurement result and required value is compared, and comes supercharging or decompression according to comparing difference.
The standard pressure transducer used in container is current mode absolute pressure transducer, and range is 0-500kPa, and corresponding 4-20mA electric current exports.The pressure conditioning scope of the manifold pressure sensor be detected and demarcate is 0-250kPa, and corresponding 4-12mA exports.Pressure adjustment process is:
1, in simulating signal input selection circuit (500), the sample resistance R21 of pressure measurement circuitry is 830 Ω, converts electric current to voltage signal, makes input voltage V=830 Ω × 12mA=9.96V, close to the full scale input voltage of ADS7805; R1 and C1 forms first-order low-pass wave circuit, and R22 gets 4.7k Ω, and C11 gets 1uF; Through filtered voltage signal by voltage follower, utilize the characteristic of operational amplifier high input impedance and low output impedance, buffer action is played to signal.This voltage signal is connected to A/D change-over circuit (401) through analog switch MAX309 and is converted to digital signal by ADS7085.
2, this digital signal can by microcomputer reading process, and required pressure value compares.
3, measured value > required value, then send large reduction valve or little reduction valve control signal by switching value output circuit (600), controls reduction valve and connect, reduce container inner pressure; Measured value < required value, then send large pressure charging valve or little pressure charging valve control signal by switching value output circuit (600), controls pressure charging valve and connect, improve container inner pressure.
Above process is the closed loop control process relying on this plug-in card to realize, and measures and controls air pressure valve, make the pressure in container reach requirement.The output of input and valve control signal that container pressure transfers current signal to is all be connected by signal connector (700) 25D socket.
Embodiment 4: to the adjustment of temperature in container
In container, the adjustment of temperature is after closing containers hermatic door, by temperature survey, measurement result and required value is compared, according to comparing difference to carry out the control that heats up or lower the temperature.
Working temperature in container is between 0 DEG C-100 DEG C, and adopt the thermistor Pt100 platinum resistance of standard to reflect temperature variation in container in a reservoir, determined by PT100 phasing meter, temperature adjustment process is:
1, in the road (500) of simulating signal input selection, the sample resistance of temperature, pressure metering circuit is thermistor (installing in a reservoir), the resistance of thermistor changes within the scope of 100 Ω ~ 138.51 Ω, this resistance value access plug-in card, then 12V voltage is through R53 and thermistor dividing potential drop, the magnitude of voltage that thermal resistance obtains is 1.09V ~ 1.459V, this signal sends A/D change-over circuit (401) to after being selected by MAX309 again after an in-phase amplifier U10 amplifies, only need change in-phase proportion enlargement factor, make the upper voltage limit value after amplification close to the full scale input voltage 10V of ADS7085.
2, the digital signal after ADS7085 conversion is by microcomputer reading process, and the temperature value required compares.
3, measured value > required value, then send air conditioner by switching value output circuit (600) and start control signal, carry out refrigeration cool-down.Measured value < required value, to voltage-controlled type well heater, sends pwm control signal by single-chip microcomputer and pwm control circuit (402) and controls to heat up; To current-control type well heater, control to heat up by D/A change-over circuit (404) output current control signal.
Above process is the closed loop control process relying on this plug-in card to realize, and measures and controls air compressor machine or well heater, make the temperature in container reach requirement.The output of input and heating-cooling control signal that vessel temp transfers resistance signal to is all be connected by signal connector (700) 25D socket.
Embodiment 5: the measuring accuracy realizing pressure, temperature
Manifold pressure sensor timing signal able to programme requires to be less than 0.1% to the container inner pressure of this sensor and the measuring error of temperature, and for this reason, the present invention adopts following methods:
1, high-precision a/d converter ADS7805 (41) is adopted, the highest sample frequency can reach 100kHz, input analog amount scope is-10V to+10V, transformation result 16 bit parallel exports, in the A/D change-over circuit (401) of this plug-in card, ADS7805 conversion range is positive range 0 ~ 9.999695V.
2, to pressure survey.Pressure conditioning scope is 0-250kPa, corresponding standard pressure transducer 4-12mA exports, the sampled voltage that sampling precision resistance R21 obtains is 3.32V ~ 9.96V, this signal is through ADS7805 conversion (positive range 15), then input voltage signal can be divided into x shelves: (9.96-3.32)/10=x/2
15x=21757.952, minimum pressure change (maximum absolute error) that can survey is less than 250000/21757=11.49Pa, the fundamental error then measured=(maximum absolute error/instrument range) * 100%=(11.49/250000) * 100%=0.00459%, fundamental error, much smaller than 0.1%, meets the accuracy requirement of 0.1 grade.
3, to temperature survey.In order to eliminate the impact of line resistance on measuring accuracy, adopt the three-wire system metering circuit in simulating signal input selection circuit (500), this circuit have employed the computing method of resnstance transformer, can eliminate the impact of conductor resistance on measurement result completely.Because temperature variation in container is at 0 ~ 100 DEG C, the resistance of thermistor changes within the scope of 100 Ω ~ 138.51 Ω, then 12V voltage is through R53 and thermistor dividing potential drop, the magnitude of voltage that thermal resistance obtains is 1.09V ~ 1.459V, this signal sends A/D change-over circuit (401) to after being selected by MAX309 again after an in-phase amplifier U10 amplifies, only need select precision resistance R13 and R12, make in-phase proportion enlargement factor be 6.8, then input voltage signal can be divided into x shelves: (1.459-1.09) × 6.8/10=x/2
15x=8222.15, detectable minimum temperature change (i.e. maximum absolute error) is 100/8222.15=0.01216 DEG C, fundamental error=(maximum absolute error/instrument range) * 100%=(0.01216/100) * 100%=0.01216%, fundamental error, much smaller than 0.1%, meets the accuracy requirement of 0.1 grade.
Embodiment 6: plug-in card externally connects
Plug-in card externally connects and comprises 2 parts:
A part is the connection of plug-in card and microcomputer PCI bus, this connection inserts pci bus by plug-in card, the connection signal of pci bus (100) and pci bus interface circuit (200) comprising: AD31 ~ AD0, CBE3 ~ CBE0, PAR, IDSEL, FARME, IRDY, TRDY, DEVSEL, INTA, CLK, RST, by interface conversion chip CH365 (21), pci bus signal is converted to separately independently address, data, control signal, and the concrete connection of various signal shows in fig. 2.
Another part is the connection that plug-in card and manifold pressure sensor demarcate the observing and controlling object in container, this connection connects (700) by the 25D plugs and sockets of a standard, socket is directly welded on plug-in card, and plug is soldered to the respective signal line of container, and the connection of signal is in table 1:
Table 1 signal connector connection signal
| 25D pin | Connection signal | I/O | 25D pin | Connection signal | I/O |
| 1 | Container gate | Export | 10 | Thermistor line 2 | Input |
| 2 | Large reduction valve | Export | 11 | Thermistor line 3 | Input |
| 3 | Little reduction valve | Export | 12 | Pressure measurement signal | Input |
| 4 | Large pressure charging valve | Export | 13 | Temperature PWM controls | Export |
| 5 | Little reduction valve | Export | 14 | Temperature D/A controls | Export |
| 6 | Compressor | Export | 15 | Temperature D/A controls | Export |
| 7 | Vacuumize | Export | 16-20 | Direct current ground | |
| 8 | Electric fan | Export | 21-22 | +12V | |
| 9 | Thermistor line 1 | Input | 23-25 | +5V |
Claims (8)
1. a manifold pressure sensor microcomputer measuring and controlling plug-in card able to programme, directly be inserted in the pci bus (1) of microcomputer, it is characterized in that: this plug-in card by pci bus interface (2), programmable parallel expansion interface (3), analog signals Survey control module (4), simulating signal input selection module (5), output switch parameter control module (6) totally five parts form; The bus signals of pci bus (1) comprises address/data multiplexing line AD31-0 (11), bus line command and byte and allows multiplexed signals CB/E3-0 (12), part control signal wire (13) and status signal lines (14); Interface conversion chip CH365 (21) connects into pci bus interface circuit (200), described interface conversion chip CH365 (21) is converted to the bus signals of pci bus (1) bus signals that data-signal (22) is separated with address signal, be used for controlling and being connected programmable parallel expansion interface (3), analog signals Survey control module (4), simulating signal input selection module (5), output switch parameter control module (6).
2. one according to claim 1 manifold pressure sensor microcomputer measuring and controlling able to programme plug-in card, it is characterized in that: described programmable parallel expansion interface (3) comprises programmable parallel mouth extended chip 8255 (31), described programmable parallel mouth extended chip 8255 (31) extends three-channel parallel expansion interface circuit (300), and a road is used for temperature adjusting control circuit output temperature control signal (32); One tunnel is used for carrying out temperature, pressure mould analog quantity A/D change after input signal (34); Also have a road interface to be used for carrying out the control cue (33) of each several part circuit specially, described three road signals connect each other form temperature, the control and measurement signalling channel of pressure carries out I/O control by microcomputor program.
3. one according to claim 1 manifold pressure sensor microcomputer measuring and controlling able to programme plug-in card, it is characterized in that: described analog signals Survey control module (4) comprises metering circuit (401), described metering circuit (401) is used to measure by the self-test signal of the pressure and temperature in the manifold pressure sensor test container demarcated and plug-in card itself; Described metering circuit (401) is made up of A/D conversion chip ADS7085 (41), function generator ICL8038 (46) and simulating signal input selection circuit (5); Described ADS7085 (41) receives the simulating signal that simulating signal input selection circuit (5) is sent here, and is read by programmable parallel mouth extended chip 8255 after described simulating signal is converted to 16 position digital signals.
4. one according to claim 1 manifold pressure sensor microcomputer measuring and controlling able to programme plug-in card, it is characterized in that: described analog signals Survey control module (4) also comprises control circuit (402,404), described control circuit (402,404) is used for controlling the well heater in container, and described control circuit (402,404) is made up of microprocessor AT89C2051 (42), pulse width modulating signal (43), D/A converter control signal (44) and D/A converter TLC5617 (45); Microprocessor AT89C2051 (42) produces according to the intensification instruction that microcomputer is sent here the speed that pulse width modulating signal controls the intensification of vessel in heating device, controls D/A converter export different analog voltage signals according to the difference of heating target.
5. one according to claim 1 manifold pressure sensor microcomputer measuring and controlling able to programme plug-in card, it is characterized in that: described simulating signal input selection module (5) is used for selecting different simulating signal input channel, described simulating signal input selection module (5) selects output signal (55) to form by the temperature-voltage input signal (53) that analog switch MAX309 (51), manifold pressure sensor demarcate the pressure-voltage input signal (52) of container, manifold pressure sensor demarcates container, plug-in card self-inspection input signal (54), analog quantity; Simulating signal input selection circuit (500) comprises described simulating signal input selection module (5) and controls cue (33), described simulating signal input selection circuit (500) is controlled by microcomputor program, realizes from three road input signals, select a road to deliver to ADS7085 (41) as output and carries out changing and measuring.
6. one according to claim 1 manifold pressure sensor microcomputer measuring and controlling able to programme plug-in card, it is characterized in that: described output switch parameter control module (6) is used for output 8 way switch amount control signal, described output switch parameter control module (6) exports control signal (62) by 8D latch 74373 (61) and 8 tunnel and form, and described 8 tunnels export control signal (62) and control the large gas admittance valve in the demarcation hermatic door switch of container and container, little gas admittance valve, greatly air outlet valve, little air outlet valve, vacuum valve, compressor, electric fan 8 control objects respectively; Output switch parameter control module (600) comprises described output switch parameter control module (6).
7. one according to claim 1 manifold pressure sensor microcomputer measuring and controlling able to programme plug-in card, it is characterized in that: this plug-in card produces outside manifold pressure sensor test and the various measuring control signals demarcating container, by signal connector (700), realize the transmission of plug-in card and external signal, this plug-in card uses the 25D type socket of standard, as the various output of plug-in card, the connector of input signal, described signal comprises 8 way switch amount output signals, container pressure-current input signal, vessel temp-thermal resistance input signal, PWM output signal, D/A converted output signal.
8. one according to claim 1 manifold pressure sensor microcomputer measuring and controlling able to programme plug-in card, is characterized in that: this plug-in card adopts the thick two-sided copper foil plate of 2.5mm to make microcomputer PCI bus plug-in card form.
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| CN201520145296.6U CN204719462U (en) | 2015-03-14 | 2015-03-14 | A kind of manifold pressure sensor microcomputer measuring and controlling plug-in card able to programme |
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| CN201520145296.6U CN204719462U (en) | 2015-03-14 | 2015-03-14 | A kind of manifold pressure sensor microcomputer measuring and controlling plug-in card able to programme |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730985A (en) * | 2015-03-14 | 2015-06-24 | 胡景春 | Programmable manifold pressure sensor microcomputer measurement and control plug-in card |
| CN114326521A (en) * | 2021-12-31 | 2022-04-12 | 中北大学 | Multi-node wireless sensor network water leakage positioning and monitoring system |
-
2015
- 2015-03-14 CN CN201520145296.6U patent/CN204719462U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730985A (en) * | 2015-03-14 | 2015-06-24 | 胡景春 | Programmable manifold pressure sensor microcomputer measurement and control plug-in card |
| CN114326521A (en) * | 2021-12-31 | 2022-04-12 | 中北大学 | Multi-node wireless sensor network water leakage positioning and monitoring system |
| CN114326521B (en) * | 2021-12-31 | 2023-11-07 | 中北大学 | Water leakage positioning and monitoring system for multi-node wireless sensor network |
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Granted publication date: 20151021 Termination date: 20170314 |