CN201233517Y - Digital monitoring and controlling system for electric vortex power measuring machine - Google Patents
Digital monitoring and controlling system for electric vortex power measuring machine Download PDFInfo
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- CN201233517Y CN201233517Y CNU2008200694915U CN200820069491U CN201233517Y CN 201233517 Y CN201233517 Y CN 201233517Y CN U2008200694915 U CNU2008200694915 U CN U2008200694915U CN 200820069491 U CN200820069491 U CN 200820069491U CN 201233517 Y CN201233517 Y CN 201233517Y
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Abstract
The utility model provides a digital measuring and controlling system of an eddy-current dynamometer. The digital measuring and controlling system comprises a main control machine, a set value input module, a signal acquisition module, a control signal output module and a display signal processing module, wherein, the main control machine comprises a main control chip DSPIC30F6014A, the serial peripheral interface of which is connected with the set value input module, the input terminals of an A/D module are respectively connected with the corresponding signal acquisition circuit of the signal acquisition module, the control signal output terminal of which is connected with the control signal output module, and the display signal output terminal of which is connected with the display signal processing module. Compared with the prior technology, the technical proposal has improvements on function maintenance and performance while saving resource, and the particular embedded measurement and control framework of the eddy-current dynamometer chip greatly improves the performance-price ratio of the product.
Description
Technical field
The utility model relates to the observation and control technology of electric eddy current dynamometer, relates in particular to a kind of electric eddy current dynamometer numeral TT﹠C system.
Background technology
At present, CW type electric eddy current dynamometer TT﹠C system is seen shown in Figure 1, be to be control center with the industrial computer, adopt A/D integrated circuit board (as PCL-813) that moment of torsion, throttle and the temperature of dynamometer machine, the analog quantity of pressure and other parameters are transformed into digital quantity, send into industrial computer again and handle; The level variation of digital quantity that employing I/O plate (HY-6220) is relevant with dynamometer machine such as tacho-pulse value, alerting signal is given industrial computer and is handled; Adopt keyboard, scrambler as input equipment, be used to set parameters such as rotating speed, moment of torsion, accelerator open degree, exciting current, test control is undertaken by relevant requirement; Display device adopts LCDs, is used to show setting value, moment of torsion, rotating speed, power, the oil consumption of controlled variable, measured value, alarm condition and the control mode of exciting current percentage; Adopt tally to be used for writing down the output data of M, N scrambler, so that make rotating speed and moment of torsion reach testing requirements.This TT﹠C system causes production cost high owing to used industrial computer and relevant integrated circuit board, is difficult for realizing embedded-type modularized, fieldbus networksization.
The utility model content
The purpose of this utility model provides a kind of electric eddy current dynamometer numeral TT﹠C system, and is with low cost, realizes total digitalization, embedded-type modularized, and then realizes fieldbus networksization.
A kind of electric eddy current dynamometer numeral TT﹠C system, comprise main control computer, setting value load module, signal acquisition module, control signal output module, shows signal processing module, wherein: described main control computer comprises a main control chip DSPIC30F6014A, its Serial Peripheral Interface (SPI) connects the setting value load module, its each A/D module input connects the corresponding signal Acquisition Circuit in the signal acquisition module respectively, its control signal output ends connects described control signal output module, and its shows signal output terminal connects described shows signal processing module.
Described electric eddy current dynamometer numeral TT﹠C system, wherein: described signal acquisition module comprises the rotating speed treatment circuit, it comprises photoelectrical coupler, power amplification circuit and the signal transformation circuit that is linked in sequence, the signal input part of photoelectrical coupler is used to connect speed probe, and the signal transformation circuit output terminal connects the corresponding A/D module input of described main control chip DSPIC30F6014A.
Described electric eddy current dynamometer numeral TT﹠C system, wherein: described signal acquisition module comprises torque signal acquisition process circuit, it comprises a reference voltage source, one direct current operational amplification circuit, zeroing and full scale Calibration Circuit, wherein, this reference voltage source is used to connect the power supply input end of torque sensor, described direct current operational amplification circuit signal input part is used to connect the signal output part of torque sensor, signal output part connects the signal input part of zeroing and full scale Calibration Circuit, and zeroing is connected the corresponding A/D module input of described main control chip DSPIC30F6014A with the signal output part of full scale Calibration Circuit.
Described electric eddy current dynamometer numeral TT﹠C system, wherein: described setting value load module comprises speed setting circuit, torque setting circuit, both include an orthogonal encoder and a dsp chip, the phase signal output terminal of orthogonal encoder, index pulse signal output terminal connect the corresponding A/D module input of corresponding dsp chip respectively, and the digital signal output end of corresponding dsp chip connects the corresponding Serial Peripheral Interface (SPI) of described main control chip DSPIC30F6014A respectively.
Described electric eddy current dynamometer numeral TT﹠C system, wherein: described dsp chip adopts DSPIC30F2010.
Described electric eddy current dynamometer numeral TT﹠C system, wherein: described signal acquisition module comprises one tunnel and one road above low-temperature signal treatment circuit; The low-temperature signal treatment circuit comprises a constant current source, a direct current operational amplification circuit, zeroing circuit, full scale Calibration Circuit, the constant current source output terminal is used to connect the power input of low-temperature sensor, is serially connected with described zeroing circuit between constant current source and the described low-temperature sensor; The input end of described direct current operational amplification circuit is used to connect described low-temperature sensor output terminal, the gain adjustment end of described direct current operational amplification circuit connects described full scale Calibration Circuit, and the signal output part of direct current operational amplification circuit connects the corresponding A/D module input of main control chip DSPIC30F6014A.
Described electric eddy current dynamometer numeral TT﹠C system, wherein: described signal acquisition module comprises one tunnel and one road above pressure signal processing circuit; Pressure signal processing circuit comprises an adjustable stabilized voltage supply, a direct current operational amplification circuit, zeroing circuit, full scale Calibration Circuit, the output terminal of adjustable stabilized voltage supply is used to connect the power input of pressure transducer, is serially connected with described zeroing circuit between adjustable stabilized voltage supply and the pressure transducer; The input end of described direct current operational amplification circuit is used to connect described pressure transducer output terminal, and the gain adjustment end of described direct current operational amplification circuit connects described full scale Calibration Circuit; The signal output part of described direct current operational amplification circuit connects the corresponding A/D module input of main control chip DSPIC30F6014A.
Described electric eddy current dynamometer numeral TT﹠C system, wherein: described signal acquisition module comprises the high temperature signal treatment circuit, it comprises a direct current operational amplification circuit, full scale Calibration Circuit, wherein, the signal input part of direct current operational amplification circuit is used to connect pyrostat, its gain is adjusted end and is connected described full scale Calibration Circuit, and its signal output part connects the corresponding A/D module input of main control chip DSPIC30F6014A.
Described electric eddy current dynamometer numeral TT﹠C system, wherein: this numeral TT﹠C system comprises the CAN communication module, described CAN communication module comprises a CAN bus driver, and the CAN bus driver is connected between the communication interface of the CAN interface of described main control chip DSPIC30F6014A and each surveying instrument.
Described electric eddy current dynamometer numeral TT﹠C system, wherein: this numeral TT﹠C system comprises Upper machine communication module, described Upper machine communication module comprises a upper machine communication circuit, and this upper machine communication circuit is connected between the asynchronous serial communication interface and communication interface with pc of described main control chip DSPIC30F6014A.
Described electric eddy current dynamometer numeral TT﹠C system, wherein: described shows signal processing module comprises a shows signal communicating circuit and a shows signal amplifying circuit, shows signal output interface, the output terminal that the input end of shows signal communicating circuit connects described main control chip DSPIC30F6014A connects the signal input part of described shows signal amplifying circuit, and the signal output part of described shows signal amplifying circuit is used to connect display.
Described electric eddy current dynamometer numeral TT﹠C system, wherein: described control signal output module comprises that excitation switches off control circuit, throttle switches off control circuit, excitation pwm signal output circuit, throttle pwm signal output circuit, lamp control signal output circuit and ignition control signal output circuit, it includes a photoelectrical coupler that has been used for buffer action, the corresponding respectively the corresponding interface that connects described main control chip DSPIC30F6014A control signal output ends of the signal input part of photoelectrical coupler, the signal input part of photoelectrical coupler is respectively applied for the control signal output ends that connects each inductive switch.
The utility model adopts technique scheme will reach following technique effect:
Electric eddy current dynamometer numeral TT﹠C system of the present utility model adopts chip DSPIC30F6014A as main control computer, utilizes 12 A/D converters (200Ks/s) of this chip, inner E
2PROM, relatively export, catch input, I
2C and SPI interface, powerful control function kernels such as Flash program storage read/write, has powerful digital signal processing capability, utilize the brand-new generation total digitalization internal combustion engine of its particular structure and functional characteristic exploitation to detect opertaing device, setting value load module with peripheral hardware, signal acquisition module, control signal output module, the shows signal processing module is formed monolithic embedded measurement control architecture easily, having substituted fully in the past must be by industrial computer, the work that all types of industries control integrated circuit board just can be finished, when having reduced cost, it is simple in structure that totally digitilized internal combustion engine of new generation detects opertaing device, module informationization, stable and reliable for performance, transplantability is strong; In addition, utilize its CAN interface by the CAN communication module connect each testing tool, its asynchronous serial communication (UART) interface connects host computer by Upper machine communication module, realized the system for field bus networkization and with host computer combined network communication function.The technical program is compared original technology, when keeping on the function, improving a lot on performance, has also saved resource, and the electric eddy current dynamometer monolithic embedded measurement control architecture of its original creation has improved cost performance of product widely.
Description of drawings
Fig. 1 is the theory diagram of existing CW type electric eddy current dynamometer measure and control device;
Fig. 2 is an electric eddy current dynamometer numeral TT﹠C system theory diagram of the present utility model;
Fig. 3 is the pin connection layout of chip DSPIC30F6014A;
Fig. 4 is a rotating speed treatment circuit schematic diagram;
Fig. 5 is torque signal acquisition process circuit theory diagrams;
Fig. 6 is rotating speed (or moment of torsion) initialization circuit schematic diagram;
Fig. 7 is a low-temperature signal treatment circuit schematic diagram;
Fig. 8 is the pressure signal processing circuit schematic diagram;
Fig. 9 is a high temperature signal treatment circuit schematic diagram;
Figure 10 is the upper machine communication circuit theory diagrams;
Figure 11 is CAN communication module circuit theory diagrams;
Figure 12 is shows signal processing module circuit theory diagrams;
Figure 13 is the control signal output module circuit theory diagrams.
Embodiment
Embodiment:
A kind of electric eddy current dynamometer numeral TT﹠C system, see theory diagram shown in Figure 2, it comprises main control computer, the setting value load module, signal acquisition module, control signal output module, the shows signal processing module, wherein: described main control computer comprises a main control chip DSPIC30F6014A, its Serial Peripheral Interface (SPI) (SPI interface) connects the setting value load module, its each A/D module input connects the corresponding signal Acquisition Circuit in the signal acquisition module respectively, its control signal output ends connects described control signal output module, and its shows signal output terminal connects described shows signal processing module.
Signal acquisition module includes one road rotating speed treatment circuit, one road torque signal acquisition process circuit, a road binders door position feedback acquisition process circuit, four road low-temperature signal treatment circuits, one road high temperature signal treatment circuit, three tunnel pressure signal processing circuit; The setting value load module comprise rotating speed, moment of torsion, excitation, throttle initialization circuit; Control signal output module comprises that excitation switches off control circuit, throttle switches off control circuit, excitation pwm signal output circuit, throttle pwm signal output circuit, lamp control signal output circuit and ignition control signal output circuit.
Chip DSPIC30F6014A has 16 bit wide data buss, 24 bit wide instructions, modified Harvard framework, high performance DSCCPU, the linear program storage space of 4M instruction word, the linear data storage space of 64KB, 16 16 general-purpose registers, 2 40 bit accumulators, 23 line SPI modules, 2 asynchronous serial communications (UART) module, 2 CAN modules, 40 barrel shift registers, 45 interrupt sources, 54 programmable digital input/output interface (I/O mouths, it is 25mA that current capacity is drawn in the filling of I/O pin), the level variation of 54 pins is interrupted/is waken up, flash memory program storage in the 144KB sheet, 4KB data EEPROM, a data translation interface (DataConversionInterface, DCI) module, fully-integrated phaselocked loop (4X, 8X and 16X), 5 16 bit timings/counters (counter can reach 32), 8 input capture passages, 16 the tunnel have the input channel of autoscan function, 12 200KspsA/D conversion modules, 8 road PWM output, also has the back off timer that powers on able to programme, oscillator, starting of oscillation timer/stabilizator, carry the WatchDog Timer of RC oscillator, emergency protection clock monitor, a plurality of reset source, real-time switching clock source, low pressure able to programme detects, the control defencive function that under-voltage reset able to programme etc. are abundant, setting value load module with peripheral hardware, signal acquisition module, control signal output module, the shows signal processing module can be formed monolithic embedded measurement control architecture easily, abandoned the required matching used all types of industries control integrated circuit board of industrial computer in the prior art fully, can reduce production costs, simplified structure, the total digitalization of realization module has stable and reliable for performance, advantages such as transplantability is strong; Utilize its CAN interface by the CAN communication module connect each testing tool, its asynchronous serial communication (UART) interface connects host computer by Upper machine communication module, realized the system for field bus networkization and with the host computer network savvy.
The pin connection of main control chip DSPIC30F6014A is seen shown in Figure 3 in the present embodiment numeral TT﹠C system:
The tach signal that the rotating speed treatment circuit is sent here is caught collection synchronously by 5,54,55 pin (being T5CK, IC1, the IC2 pin) input of main control chip DSPIC30F6014A; The torque signal that torque signal acquisition process circuit is sent here is by road A/D ALT-CH alternate channel AN3 pin (17 pin) input of main control chip DSPIC30F6014A, the throttle position value of feedback is by another road A/D ALT-CH alternate channel AN15 (36 pin) input of DSPIC30F6014A, excitation actual value feedback signal is imported through pin AN9 (28 pin), by corresponding 12 A/D modules the simulating signal of sending into is transformed into digital signal respectively, the DSCCPU by the DSPIC30F6014A chip handles again; In addition, the A/D module input pin AN6 that this chip DSPIC30F6014A is other, AN7, AN8, AN11 (promptly 21,22,27,30 pin), be respectively applied for and connect first, second, the 3rd, the 4th low-temperature signal treatment circuit (low temperature refers to 0-150 ℃), pin AN13, AN14, AN10 (promptly 34,35,29 pin) be respectively applied for connection first, second, the 3rd pressure signal processing circuit, pin AN12 (33 pin) one road high temperature signal treatment circuit (high temperature refers to 0-1000 ℃), corresponding A/D module is transformed into digital signal with the simulating signal of input, and the DSCCPU that gives this chip DSPIC30F6014A again handles.
The level interruptive port CN13 of this chip DSPIC30F6014A, CN15, CN16 (66,68,69 pin), CN19-23 (65,37,38,76,77 pin) link to each other with inductive switches such as dynamometer machine main frame temperature, pressure, oil pumps respectively, realize Host Protection control.
The C1RX of the CAN1 port of this chip DSPIC30F6014A (72 pin) links to each other with RXD, the TXD of CAN bus driver with C1TX (73 pin), by CAN bus driver compositing area net.
The U1TX of UART Universal Asynchronous Receiver Transmitter UART1 and UART2 module (41 pin), U1RX (42 pin), U2TX (40 pin), U2RX (39 pin) link to each other with communication module MAX232 respectively; The data of U1TX, U1RX and host computer carry out exchanges data, and the data of U2TX, U2RX and display screen (present embodiment adopts touch-screen to replace single display screen and keyboard, realizes the function of demonstration and input simultaneously) exchange.
The SCK2 (6 pin) of the SCK1 (45 pin) of serial peripheral port SPI1 module, SDI1 (44 pin), SDO1 (43 pin) and SPI2 module, SDI2 (7 pin), SDO2 (8 pin), the corresponding respectively SPI port that connects first, second signal processing control unit DSPIC30F2010 chip; Two signal processing control unit DSPIC30F2010 are processed into digital signal with the setting value of rotating speed, moment of torsion respectively and give main control chip DSPIC30F6014A, give touch-screen through main control chip and show, or carry out exchanges data, carry out processing controls by main control computer with main control chip DSPIC30F6014A.
The rotating speed treatment circuit as shown in Figure 4; Speed probe is a HE16M type Hall speed probe, it detects the tach signal that is formed by the disk rotation of testing the speed in its inter-process circuit, the detected number of teeth is become pulse signal give the N4 of the photoelectronic coupler in the speed setting circuit, photoelectronic coupler N4 has been a buffer action, tach signal is delivered to the base stage of power amplifier V1 from its output terminal 7 pin after photoelectronic coupler N4 isolates, driving power amplifier V1 conducting, this tach signal is sent into hex inverter N5 (adopting CC4069) and is carried out shaping pulse after power amplification, the signal after the shaping is through 10 of hex inverter N5, the merging of 12 pin exports main control chip DSPIC30F6014A respective input to.
The inside of HE16M type Hall speed probe is equipped with and is handled amplifying circuit, Hi-pass filter, can export stable digital signal, output amplitude and fluted disc rotating speed are irrelevant, nearly zero velocity is arranged and up to the frequency of operation of 100KHz, power supply voltage range is wide by (4.5-24V) simultaneously, output amplitude big (be supply voltage 0.95 times), output current can reach 40mA; The facewidth is as long as just can work greater than 0.8mm, and the gap 0.2mm-3mm that allows also is convenient to install, and this type sensor has overcome the interference problem that is subject to of magnetoelectric transducer existence fully; Photoelectronic coupler N4 is used for carrying out jamproof, and the noise filtering that the speed probe end can be entered falls a part, and reliability, stability and the anti-electromagnetic interference capability of this digital TT﹠C system are improved greatly.The signal conveys of rotating speed treatment circuit output is to seizure mouth and the external clock input port of main control chip DSPIC30F6014A, and utilization M/T method realizes the rotating speed collection.
The M/T method is a kind of fast accurate rotating speed measurement method, utilizes the seizure mouth of DSPIC30F6014A that tested tacho-pulse and system clock pulse are begun, finish counting simultaneously during measurement.The system of setting up departments is T0 the clock period, and tested tacho-pulse counting is M, and the system clock counting is n, and then tested tacho-pulse frequency is f=M/ (n * T
0).The M/T method can be measured the tacho-pulse (high rotating speed) of high frequency quickly and accurately, requires the control system of extra-high-speed particularly useful to real-time.
Torque signal acquisition process circuit such as Fig. 5, comprise accurate reference voltage 1N1, direct current instrument amplifier 1N2, zeroing and full scale Calibration Circuit, it is REF02 that accurate reference voltage 1N1 adopts model, be used to torque sensor (being strain gauge pressure sensor in the present embodiment) power supply, its output voltage is 5V ± 0.001V, temperature stability≤8.5 * 10
-6/ ℃, for this strain gauge pressure sensor provides a temperature coefficient very good, the bridge that the magnitude of voltage precision is high is pressed; The direct current instrument adopts INA114 with amplifier IN2, its offset voltage, temperature drift is all very low, can work under ± 2.25V power supply, adapt to most and carry out the bridge-type amplification, the signal output part of strain gauge pressure sensor through draw/pressure converter S8 is connected to the signal input part of direct current instrument with amplifier IN2, after amplifying, direct current sends into zeroing and full scale Calibration Circuit, zeroing and full scale Calibration Circuit are by operational amplifier 1N3, potentiometer 1R6, two stabilivolt Z1, compositions such as Z2, operational amplifier 1N3 adopts high-precision amplifying OP07EP, two stabilivolt Z1, Z2 is identical, be 2DW232 with high-temperature stability, guarantee zero-bit, signal, parameters such as amplification quantity are not subjected to temperature, the environmental change influence is so that produce stable, reliably, torque signal accurately; The in-phase input end of operational amplifier 1N3 connects the adjustable terminal of potentiometer 1R6, the inverting input of operational amplifier 1N3 is connected to reference voltage source by a divider resistance 1R8, the bleeder circuit ground connection that the end of potentiometer 1R6 constitutes by divider resistance 1R5,1R3 series connection, the bleeder circuit ground connection that the other end constitutes by divider resistance 1R4,1R2 series connection; The series circuit of series circuit that two stabilivolt Z1, Z2 are connected in series from beginning to end and resistance 1R5, potentiometer 1R6, resistance 1R3 is in parallel, the intermediate contact ground connection of two stabilivolt Z1, Z2, like this, about potentiometer 1R6, return to zero and the full scale timing signal, all can play the effect of voltage stabilizing; Potentiometer 1R6 plays the effect of coarse adjustment, in addition, also be serially connected with the fine tuning circuit between the output terminal of operational amplifier 1N3 and the inverting input, this fine tuning circuit is made of divider resistance 1R10, potentiometer 1R9,1R12 series connection, reaches by the adjustment feedback signal zero-bit and full scale are demarcated the effect of carrying out fine tuning.The output signal of torque signal acquisition process circuit is delivered to the corresponding A/D module of main control chip DSPIC30F6014A and is handled.
The setting of rotating speed, moment of torsion is to adopt N orthogonal encoder, M orthogonal encoder respectively, and respectively the DSPIC30F2010 digital signal controller by correspondence carries out record acquisition again; Fig. 6 is that (the initialization circuit principle of rotating speed is identical with it for the initialization circuit schematic diagram of moment of torsion, promptly repeat no more): form by M orthogonal encoder OEW-0256-2M and DSPIC30F2010 signal processor etc., this orthogonal encoder has three outputs, is respectively: phase place A (QEA), phase place B (QEB) and index (INDEX); The QEI module of signal processor DSPIC30F2010 is caught the phase signal and the index pulse of this scrambler, and be the digital count value of P-pulse with conversion of signals, when this M orthogonal encoder was turned clockwise, count value increased progressively counting, when scrambler is rotated counterclockwise, the count value countdown; After configuring this M orthogonal encoder, corresponding signal is sent into main control chip DSPIC30F6014A through the DSPIC30F2010 signal processor processes through the SPI mouth (Serial Peripheral Interface (SPI)) of this signal processor DSPIC30F2010.Serial Peripheral Interface (SPI) (SPI) module of DSPIC series controller is a kind of synchronous serial interface, be mainly used in other peripherals or microcontroller apparatus and communicate by letter, the serial data of the SPI mouth of signal processor DSPIC30F2010 and main control chip DSPIC30F6014A input SDI pin and serial data output SDO pin crossed one another be connected, just can realize the transmission and the reception of data, communication data can be 8 or 16.Setting value reliability height, strong interference immunity that the method produces.The SPI module is the corresponding communication port that has SPI serial communication function among the main control chip DSPIC30F6014A, and this SPI mode can allow synchronized transmission and reception 8 bit data simultaneously.(M, N two scramblers (M refers to moment of torsion in the present embodiment, and N refers to rotating speed), M scrambler are exactly setting value to the M torque value by the setting to this scrambler promptly, and the N scrambler is to be exactly setting value to the N rotating speed by the setting to this scrambler.Illustrate as follows: become 100N.m if think the loading moment of torsion of current dynamometer machine, rotation M scrambler, the torque setting value is set to 100N.m, in main control chip DSPIC30F6014A, carry out afterwards exporting the excitation pwm signal after the digital PID computing, thereby regulate the size of electric current in the dynamometer machine field coil, make that finally the loading moment of torsion of dynamometer machine is 100N.m.), signal processor DSPIC30F2010 is by its inner integrated QEI interface, the rotating cycle of M or N scrambler is become the displacement of its straight line, the size of this amount has reflected the size of setting value, and signal processor DSPIC30F2010 passes to DSPIC30F6014A by the SPI mode with setting value afterwards.
In the present embodiment, first, second, the 3rd, the 4th this four road low-temperature signals treatment circuit is identical, with the first low-temperature signal treatment circuit is example, its circuit theory diagrams as shown in Figure 7, comprise a constant current source 1N2, operational amplifier 1N1, zero potentiometer 1R1, full scale is demarcated potentiometer 1R3, constant current source 1N2 output terminal is used to low-temperature sensor that power supply is provided, low-temperature sensor adopts PT100 in the present embodiment, be serially connected with zero potentiometer 1R1 between constant current source 1N2 and the low-temperature sensor PT100, operational amplifier 1N1's is same, inverting input 3,2 pin are used for the two ends of the corresponding described low-temperature sensor PT100 of connection, the gain adjustment end 1 of operational amplifier 1N1, be serially connected with full scale between 8 pin and demarcate the full scale Calibration Circuit that potentiometer 1R3 connects with divider resistance 1R2 and constitutes; Operational amplifier 1N1 is high precision dc operational amplifier INA114, constant current source 1N2 is REF200, constant current source 1N2 provides induced current to low-temperature sensor PT100, low-temperature sensor PT100 resistance becomes big when temperature raises, operational amplifier 1N1 input terminal voltage increases, realize zeroing by zero potentiometer 1R1, realize the full scale demarcation by adjusting potentiometer 1R3, the signal after operational amplifier 1N1 handles is delivered to the corresponding A/D module of main control chip DSPIC30F6014A and is handled.
In the present embodiment, three tunnel pressure signal processing circuit as shown in Figure 8, include an operational amplifier, zeroing circuit, the full scale Calibration Circuit, also comprise the adjustable stabilized voltage supply that is used to pressure transducer that stabilized power source is provided, the input end of operational amplification circuit is used to connect described pressure transducer output terminal, be serially connected with zeroing circuit between pressure transducer and the corresponding operational amplifier, the gain adjustment end of operational amplification circuit connects described full scale Calibration Circuit, and the signal output part of operational amplification circuit connects the corresponding A/D module of main control chip DSPIC30F6014A input pin; Wherein, pressure transducer all adopts silicon pressure sensor, and (its output voltage range is 5-10V, silicon pressure sensor P1 in the present embodiment, P2, P3, P4 constitutes bridge architecture by four voltage dependent resistor (VDR)s, do not indicate the label of each voltage dependent resistor (VDR) among the figure one by one, only with label P1, P2, P3, P4 represents each pressure transducer), N1, N2 is adjustable stabilized voltage supply (adopting the bistable voltage source is for improving load capacity), be pressure transducer P1, P2, P3, P4 provides bridge to press, the output terminal of each pressure transducer all connects an operational amplifier, and (pressure sensor circuit is four the tunnel among the figure, be three the tunnel normally to use, one tunnel backup), corresponding each road operational amplifier 1N1,2N1,3N1,4N1 all adopts high precision dc operational amplifier INA114, four zero potentiometer 1R5,2R5,3R5,4R5 correspondence respectively is serially connected between corresponding pressure transducer and the operational amplifier, four full scales are demarcated potentiometer 1R2,2R2,3R2,4R2 is corresponding respectively to be connected on the gain adjustment end of corresponding operational amplifier, the brachium pontis of corresponding pressure sensor has difference output when pressure changes, by corresponding operational amplifier processing and amplifying, and, deliver to the corresponding A/D module of main control chip DSPIC30F6014A and handle through zeroing and full scale demarcation.
The high temperature signal treatment circuit comprises a direct current operational amplification circuit, full scale Calibration Circuit, wherein, the signal input part of direct current operational amplification circuit is used to connect pyrostat, its gain is adjusted end and is connected described full scale Calibration Circuit, and its signal output part connects the corresponding A/D module input of main control chip DSPIC30F6014A; The high temperature signal treatment circuit as shown in Figure 9, wherein, pyrostat adopts K calibration armored thermopair H, the direct current operational amplification circuit comprises an operational amplifier 1N1, it adopts high precision dc operational amplifier INA114, the full scale Calibration Circuit is connected with a divider resistance 1R1 by full scale demarcation potentiometer 1R2 and is constituted, the full scale Calibration Circuit is connected between gain adjustment end 1,8 pin of operational amplifier 1N1, adjust potentiometer 1R2 and can realize the gain adjustment of operational amplifier 1N1, and then realize the full scale adjustment indirectly.Thermopair H two output end voltages become big when temperature variation, after operational amplifier 1N1 processing and amplifying, full scale demarcation, deliver to the corresponding A/D module of main control chip DSPIC30F6014A through operational amplifier 1N1 signal output part and carry out A/D conversion, and compensate in main control chip inside, digital zero setting and subsequent treatment.
The circuit theory diagrams of Upper machine communication module as shown in figure 10, it comprises a communication chip MAX232, the pin T2OUT of chip MAX232 (7 pin), R2IN (8 pin) link to each other with 2,3 pin of host computer nine core communication interfaces respectively, the T2IN of chip MAX232, R2OUT link to each other with U1TX, the U1RX pin of main control chip DSPIC30F6014A asynchronous serial communication (UART) interface, thereby realize exchanges data.
The circuit theory of CAN communication module as shown in figure 11, it comprises a CAN bus driver N16 (adopting MCP2551), the pin CRNL of CAN bus driver N16 (6 pin), CRNH (7 pin), RS pin (8 pin) link to each other with 2 pin, 3 pin (3 pin are connected in series with 7 pin), 4 pin of corresponding nine core communication interfaces on the CAN bus network respectively, and the pin RXD of CAN bus driver N16 (4 pin), TXD (1 pin) link to each other with C1TX, the C1RX pin of main control chip DSPIC30F6014A respectively.Main control chip DSPIC30F6014A is connected on the CAN bus network by its CAN module, and surveying instruments such as fuel consumption meter, smoke intensity instrument, flowmeter carry out data communication by CAN bus and main control chip.
CAN (controllerareanetwork) bus is that German Bosch company early 1980s is for solving a kind of serial data communication agreement that control numerous in the Hyundai Motor and the exchanges data between the testing tool are developed.This communications protocol is formulated according to the open system interconnection model (ISO/OSI) that ISO (International Standards Organization) provided, Physical layer and data link layer in the IOS/OSI7 layer framework have been adopted, it is a kind of multi-master bus, any node all can initiatively send information to other node on the network, have these advantages just, the feasible connection with testing meter and instrument commonly used by the CAN bus becomes very convenient, and communication speed height, error rate is extremely low, reliability is high, thereby can realize the communication of regional network networking data.
Display circuit as shown in figure 12, display screen adopts touch-screen in the present embodiment, comprise a communication chip MAX232 in the display circuit, the pin T2IN of communication chip MAX232 (10 pin), R2OUT (9 pin) link to each other with U1TX, the U1RX pin of another asynchronous serial communication (UART) interface of main control chip DSPIC30F6014A respectively, the pin T2OUT of communication chip MAX232 (7 pin), R2IN (8 pin) link to each other with pin RXD (14 pin), the TXD (12 pin) of integrated array piece J3 respectively, thereby realize the exchanges data of touch-screen and main control chip DSPIC30F6014A.Touch-screen has fast, flexible, characteristics such as resolution is high, long service life, touch-screen as simulating keyboard, use flexibly, because main control chip DSPIC30F6016A has the various interfaces that needs can be formed in 256 interfaces, and it is friendly, succinct, simple to operate, clear, when determining certain option, as long as it is just passable to touch a sub-screen.Response speed is fast.
Main control chip DSPIC30F6014A compares the actual value and the setting value of the rotating speed of engine, output torque (by the dynamometer machine output torque), throttle position, again through the PWM generator output two-way pwm signal of PID computing by controller, one the road to Dynamometer Control mechanism, one the road to throttle topworks, finishes control task.DSPIC30F6014A digitial controller PWM control output framework is based on the inner integrated PWM module of this controller, and wherein one the tunnel is used to control energized circuit, and another road is used to control the throttle control loop; Its input is the controlled quentity controlled variable of PID computing, and its output is the PWM waveform.The PWM module of control energized circuit outputs on the circuit board of power supply servo unit corresponding electric and electronic power switching tube device such as IGBT manages, and the output load of this power tube is the dynamometer machine field coil, removes to produce current vortex; The PWM module in control throttle control loop outputs to the Darlington switching power tube on the circuit board of power supply servo unit, and the field coil of throttle actuator directly arrive in the output of this power tube, drives throttle and follows the tracks of setting value and move to produce electromagnetic force.
Figure 13 is the circuit theory diagrams of control signal output module, control signal output module comprises that excitation switches off control circuit, throttle switches off control circuit, throttle pwm signal output circuit, excitation pwm signal output circuit, lamp control signal output circuit and ignition control signal output circuit, it comprises that respectively one has been used for the photoelectrical coupler N8 of buffer action, N9, N11, N12, N13, N14, the corresponding respectively the corresponding interface that connects described main control chip DSPIC30F6014A control signal output ends of the signal input part of corresponding light electric coupler, the signal input part of corresponding light electric coupler is respectively applied for the control signal output ends that connects each inductive switch.
The technical program can be controlled automatically to the engine operating condition test, as performance test, endurancing, fail-test, cold shock testing, mechanical loss power test and cylinder power equalizing test etc., also can be used for the detection and the test of miscellaneous equipments such as motor, wheel box, oil pump nozzle speed regulator, can utilize SPI, UART, CAN, I
2The C interface module realizes communicating by letter widely and exchanges data with other peripherals such as thermal shock device, the anti-dragging device of frequency converter, host computer, fuel consumption meter, emission analyzers, also can realize the control of 5 kinds of modes such as nature adjusting, the positioning of permanent rotating speed, permanent rotational speed regulation, the positioning of permanent moment of torsion, permanent torque adjustment; Experimental examination wherein, permanent rotating speed control accuracy is better than ± 5r/min, and permanent moment of torsion control accuracy is better than ± 0.2%FSR, and the response time of regulating control mode shortens greatly, shortens to present 3～4 seconds by original 6～7 seconds; Can also be with 16 tunnel simulating signals such as the Inlet and outlet water temperature of 12 precision collection, processing, demonstration engine, delivery temperature, engine oil pressure, moment of torsion, throttle position, the control device of each model of CW series electric eddy current dynamometer can be configured to, function can be realized fully with the electric eddy current dynamometer measure and control device of industrial computer and integrated circuit board composition.
Claims (12)
1, a kind of electric eddy current dynamometer numeral TT﹠C system, comprise main control computer, setting value load module, signal acquisition module, control signal output module, shows signal processing module, it is characterized in that: described main control computer comprises a main control chip DSPIC30F6014A, its Serial Peripheral Interface (SPI) connects the setting value load module, its each A/D module input connects the corresponding signal Acquisition Circuit in the signal acquisition module respectively, its control signal output ends connects described control signal output module, and its shows signal output terminal connects described shows signal processing module.
2, electric eddy current dynamometer numeral TT﹠C system as claimed in claim 1, it is characterized in that: described signal acquisition module comprises the rotating speed treatment circuit, it comprises photoelectrical coupler, power amplification circuit and the signal transformation circuit that is linked in sequence, the signal input part of photoelectrical coupler is used to connect speed probe, and the signal transformation circuit output terminal connects the corresponding A/D module input of described main control chip DSPIC30F6014A.
3, electric eddy current dynamometer numeral TT﹠C system as claimed in claim 1, it is characterized in that: described signal acquisition module comprises torque signal acquisition process circuit, it comprises a reference voltage source, one direct current operational amplification circuit, zeroing and full scale Calibration Circuit, wherein, this reference voltage source is used to connect the power supply input end of torque sensor, described direct current operational amplification circuit signal input part is used to connect the signal output part of torque sensor, signal output part connects the signal input part of zeroing and full scale Calibration Circuit, and zeroing is connected the corresponding A/D module input of described main control chip DSPIC30F6014A with the signal output part of full scale Calibration Circuit.
4, electric eddy current dynamometer numeral TT﹠C system as claimed in claim 1, it is characterized in that: described setting value load module comprises speed setting circuit, torque setting circuit, both include an orthogonal encoder and a dsp chip, the phase signal output terminal of orthogonal encoder, index pulse signal output terminal connect the corresponding A/D module input of corresponding dsp chip respectively, and the digital signal output end of corresponding dsp chip connects the corresponding Serial Peripheral Interface (SPI) of described main control chip DSPIC30F6014A respectively.
5, electric eddy current dynamometer numeral TT﹠C system as claimed in claim 4, it is characterized in that: described dsp chip adopts DSPIC30F2010.
6, electric eddy current dynamometer numeral TT﹠C system as claimed in claim 1, it is characterized in that: described signal acquisition module comprises one tunnel and one road above low-temperature signal treatment circuit; The low-temperature signal treatment circuit comprises a constant current source, a direct current operational amplification circuit, zeroing circuit, full scale Calibration Circuit, the constant current source output terminal is used to connect the power input of low-temperature sensor, is serially connected with described zeroing circuit between constant current source and the described low-temperature sensor; The input end of described direct current operational amplification circuit is used to connect described low-temperature sensor output terminal, the gain adjustment end of described direct current operational amplification circuit connects described full scale Calibration Circuit, and the signal output part of direct current operational amplification circuit connects the corresponding A/D module input of main control chip DSPIC30F6014A.
7, electric eddy current dynamometer numeral TT﹠C system as claimed in claim 1, it is characterized in that: described signal acquisition module comprises one tunnel and one road above pressure signal processing circuit; Pressure signal processing circuit comprises an adjustable stabilized voltage supply, a direct current operational amplification circuit, zeroing circuit, full scale Calibration Circuit, the output terminal of adjustable stabilized voltage supply is used to connect the power input of pressure transducer, is serially connected with described zeroing circuit between adjustable stabilized voltage supply and the pressure transducer; The input end of described direct current operational amplification circuit is used to connect described pressure transducer output terminal, and the gain adjustment end of described direct current operational amplification circuit connects described full scale Calibration Circuit; The signal output part of described direct current operational amplification circuit connects the corresponding A/D module input of main control chip DSPIC30F6014A.
8, electric eddy current dynamometer numeral TT﹠C system as claimed in claim 1, it is characterized in that: described signal acquisition module comprises the high temperature signal treatment circuit, it comprises a direct current operational amplification circuit, full scale Calibration Circuit, wherein, the signal input part of direct current operational amplification circuit is used to connect pyrostat, its gain is adjusted end and is connected described full scale Calibration Circuit, and its signal output part connects the corresponding A/D module input of main control chip DSPIC30F6014A.
9, electric eddy current dynamometer numeral TT﹠C system as claimed in claim 1, it is characterized in that: this numeral TT﹠C system comprises the CAN communication module, described CAN communication module comprises a CAN bus driver, and the CAN bus driver is connected between the communication interface of the CAN interface of described main control chip DSPIC30F6014A and each surveying instrument.
10, electric eddy current dynamometer numeral TT﹠C system as claimed in claim 1, it is characterized in that: this numeral TT﹠C system comprises Upper machine communication module, described Upper machine communication module comprises a upper machine communication circuit, and this upper machine communication circuit is connected between the asynchronous serial communication interface and communication interface with pc of described main control chip DSPIC30F6014A.
11, electric eddy current dynamometer numeral TT﹠C system as claimed in claim 1, it is characterized in that: described shows signal processing module comprises a shows signal communicating circuit and a shows signal amplifying circuit, shows signal output interface, the output terminal that the input end of shows signal communicating circuit connects described main control chip DSPIC30F6014A connects the signal input part of described shows signal amplifying circuit, and the signal output part of described shows signal amplifying circuit is used to connect display.
12, electric eddy current dynamometer numeral TT﹠C system as claimed in claim 1, it is characterized in that: described control signal output module comprises that excitation switches off control circuit, throttle switches off control circuit, excitation pwm signal output circuit, throttle pwm signal output circuit, lamp control signal output circuit and ignition control signal output circuit, it includes a photoelectrical coupler that has been used for buffer action, the corresponding respectively the corresponding interface that connects described main control chip DSPIC30F6014A control signal output ends of the signal input part of photoelectrical coupler, the signal input part of photoelectrical coupler is respectively applied for the control signal output ends that connects each inductive switch.
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| CNU2008200694915U CN201233517Y (en) | 2008-03-04 | 2008-03-04 | Digital monitoring and controlling system for electric vortex power measuring machine |
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| CNU2008200694915U CN201233517Y (en) | 2008-03-04 | 2008-03-04 | Digital monitoring and controlling system for electric vortex power measuring machine |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104897328A (en) * | 2015-05-17 | 2015-09-09 | 成都诚邦动力测试仪器有限公司 | Eddy current power-measuring system based on diode symmetry detection circuit |
| CN105043619A (en) * | 2015-05-17 | 2015-11-11 | 成都诚邦动力测试仪器有限公司 | Eddy current power measuring system based on integrating circuit |
| CN105043614A (en) * | 2015-05-17 | 2015-11-11 | 成都诚邦动力测试仪器有限公司 | Eddy current power measuring system based on band-pass filtering |
| CN105136366A (en) * | 2015-05-17 | 2015-12-09 | 成都诚邦动力测试仪器有限公司 | Current vortex power measuring system based on signal conditioning circuit |
| CN105136365A (en) * | 2015-05-17 | 2015-12-09 | 成都诚邦动力测试仪器有限公司 | Signal amplification type current vortex power measuring system |
| CN105181197A (en) * | 2015-05-17 | 2015-12-23 | 成都诚邦动力测试仪器有限公司 | Eddy current dynamometer system based on logic amplification circuit |
| CN105424379A (en) * | 2015-11-21 | 2016-03-23 | 成都科瑞信科技有限责任公司 | Eddy current retarder testing system based on adjustable signal filtering and temperature detection |
| CN107631825A (en) * | 2017-10-31 | 2018-01-26 | 集美大学 | Control system and its control method based on the portable ship electronic indicators of ARM |
| CN109470485A (en) * | 2018-09-28 | 2019-03-15 | 中国地质大学（武汉） | A kind of CAN bus based engine pedestal integration test control system |
| CN113552824A (en) * | 2021-07-07 | 2021-10-26 | 株洲六零八所科技有限公司 | Embedded-based high-speed hydraulic power measurement controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104897328A (en) * | 2015-05-17 | 2015-09-09 | 成都诚邦动力测试仪器有限公司 | Eddy current power-measuring system based on diode symmetry detection circuit |
| CN105043619A (en) * | 2015-05-17 | 2015-11-11 | 成都诚邦动力测试仪器有限公司 | Eddy current power measuring system based on integrating circuit |
| CN105043614A (en) * | 2015-05-17 | 2015-11-11 | 成都诚邦动力测试仪器有限公司 | Eddy current power measuring system based on band-pass filtering |
| CN105136366A (en) * | 2015-05-17 | 2015-12-09 | 成都诚邦动力测试仪器有限公司 | Current vortex power measuring system based on signal conditioning circuit |
| CN105136365A (en) * | 2015-05-17 | 2015-12-09 | 成都诚邦动力测试仪器有限公司 | Signal amplification type current vortex power measuring system |
| CN105181197A (en) * | 2015-05-17 | 2015-12-23 | 成都诚邦动力测试仪器有限公司 | Eddy current dynamometer system based on logic amplification circuit |
| CN105424379A (en) * | 2015-11-21 | 2016-03-23 | 成都科瑞信科技有限责任公司 | Eddy current retarder testing system based on adjustable signal filtering and temperature detection |
| CN107631825A (en) * | 2017-10-31 | 2018-01-26 | 集美大学 | Control system and its control method based on the portable ship electronic indicators of ARM |
| CN109470485A (en) * | 2018-09-28 | 2019-03-15 | 中国地质大学（武汉） | A kind of CAN bus based engine pedestal integration test control system |
| CN113552824A (en) * | 2021-07-07 | 2021-10-26 | 株洲六零八所科技有限公司 | Embedded-based high-speed hydraulic power measurement controller |
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