CN220542118U - Signal system for comprehensive detection of digital instrument - Google Patents
Signal system for comprehensive detection of digital instrument Download PDFInfo
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- CN220542118U CN220542118U CN202321776822.XU CN202321776822U CN220542118U CN 220542118 U CN220542118 U CN 220542118U CN 202321776822 U CN202321776822 U CN 202321776822U CN 220542118 U CN220542118 U CN 220542118U
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Abstract
The utility model discloses a signal system for comprehensive detection of a digital instrument, which comprises a control unit MCU, a resistor output circuit, a bulb switching value output circuit, an alarm signal acquisition module, a voltage output module and an upper computer module, wherein the output end of the control unit MCU is respectively connected to the resistor output circuit, the bulb switching value output circuit and the voltage output module and is used for controlling the control unit MCU to respectively output a resistance signal, a switching value signal and a voltage signal required by a test instrument; the input end of the control unit MCU is connected to the output voltage of the instrument through the ADC acquisition module; the alarm signal output by the instrument to be tested is connected to the control unit MCU through the alarm signal acquisition module; the control unit MCU is connected with the upper computer module through a serial port circuit. The utility model has the advantages that: the circuit can output signals required by various instrument tests, thereby meeting the requirement of instrument production tests, and the circuit is simple, low in cost and capable of reliably generating required electric signals.
Description
Technical Field
The utility model relates to the field of instrument detection, in particular to a signal system for comprehensive detection of a digital instrument.
Background
Along with the development of modern automobile technology, the variety of sensors is more and more, and the automobile instrument receives sensor signals and also presents diversified and complicated trends, such as a voice-controlled multifunctional automobile instrument panel with the patent application number of CN201410125296.X, which comprises a panel body; the disc body comprises a brake fault indicating device, a car lamp fault indicating device, an engine fault indicating device, a fuel shortage indicating device, a speed indicating device and a voice function; the inside of the tray body is provided with a shock absorbing device and a data system; the brake fault indicating device, the car lamp fault indicating device, the engine fault indicating device, the fuel shortage indicating device, the speed indicating device and the voice function are all connected with the data system. The multifunctional instrument panel integrates multiple functions, and achieves multifunction and integration of the instrument panel.
Because of the development of the integration direction of the automobile instrument panel, the automobile instrument has multiple functions, such as various instruments including a speedometer, a tachometer, a water temperature and the like, various indicator lamps and alarm display, and the received signals have different sensor signal types including resistance value signals, frequency signals, switch signals, voltage signals and the like; in the production process of the automobile instrument, the instrument needs to be detected, and different test signals are required to be output to the instrument during detection, wherein the test signals comprise resistance signals, voltage signals and the like. The prior art has no signal generating circuit with multiple signal outputs, and can not provide reliable generation of multiple types of signals for detection of the instrument.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art, and provides a signal system for comprehensive detection of a digital instrument, which is used for outputting signals required by testing various instruments and meeting the requirements of comprehensive testing of the instruments.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: the signal system for the comprehensive detection of the digital instrument comprises a control unit MCU, a resistor output circuit, a bulb switching value output circuit, an alarm signal acquisition module, a voltage output module and an upper computer module, wherein the output end of the control unit MCU is respectively connected to the resistor output circuit, the bulb switching value output circuit and the voltage output module and is used for controlling the control unit MCU to respectively output a resistor signal, a switching value signal and a voltage signal required by a test instrument; the input end of the control unit MCU is connected to the output voltage of the instrument through the ADC acquisition module; the alarm signal output by the instrument to be tested is connected to the control unit MCU through the alarm signal acquisition module; the control unit MCU is connected with the upper computer module through a serial port circuit.
The control unit MCU is connected to the upper computer module through the magnetic isolation chip and the USB virtual serial port chip in sequence.
The resistor output circuit comprises a plurality of resistors and relays corresponding to the resistors, and the output end of the control unit MCU is connected with the control end of each relay; each resistor is connected in parallel with the normally open contact of the corresponding relay to form a resistor selection unit, and each resistor selection unit is sequentially connected in series, and resistor signal output terminals are led out from two ends of the resistor selection unit after being connected in series and used for outputting a resistor test signal to the instrument to be detected.
The bulb switching value output circuit comprises a plurality of relays, one end of a normally open contact of each relay is grounded or powered, and the other end of the normally open contact of each relay is led out of a switching value output terminal; the output end of the control unit MCU is connected to the control end of each relay.
The alarm signal acquisition module comprises at least two alarm acquisition branches, each alarm acquisition branch comprises a triode Q3, and the base electrode of the triode Q3 is led out of an alarm signal input terminal through a resistor R11; the emitter electrode of the triode Q3 is grounded; the collector of the triode Q3 is connected with a power supply Vcc through a resistor R10; the power supply Vcc is connected to the anode of the diode D2 via the resistor R9, and the cathode of the diode D2 is connected to the alarm signal input terminal.
The voltage output module comprises a DAC module and an operational amplifier circuit;
the output end of the control unit MCU is connected with an operational amplifier, and the output end of the operational amplifier is used for outputting a voltage signal required by the instrument to be tested.
The utility model has the advantages that: the circuit can output signals required by various instrument tests, thereby meeting the requirement of instrument production tests, and the circuit is simple, low in cost and capable of reliably generating required electric signals.
Drawings
The contents of the drawings and the marks in the drawings of the present specification are briefly described as follows:
FIG. 1 is a schematic block diagram of the present utility model;
FIG. 2 is a schematic diagram of an MCU of the present utility model;
FIG. 3 is a schematic diagram of a communication interface;
FIG. 4 is a schematic diagram of a port expansion circuit 8255 of the present utility model;
FIG. 5 is a schematic diagram of a resistance signal generation circuit according to the present utility model;
FIG. 6 is a schematic diagram of the switching value signal output principle;
FIG. 7 is a schematic diagram of a voltage output signal circuit;
fig. 8 is a schematic diagram of alarm signal acquisition.
Detailed Description
The following detailed description of the utility model refers to the accompanying drawings, which illustrate preferred embodiments of the utility model in further detail.
The utility model mainly realizes a can satisfy the required multiple signal's of instrument test generating system, generates resistance signal, switching value signal, voltage signal respectively and can realize detecting alarm signal, and its concrete scheme is as follows:
as shown in fig. 1, the signal system for comprehensive detection of the digital instrument comprises a control unit MCU, a resistor output circuit, a bulb switching value output circuit, an alarm signal acquisition module, a voltage output module and an upper computer module, wherein the output end of the control unit MCU is respectively connected to the resistor output circuit, the bulb switching value output circuit and the voltage output module and is used for controlling the control unit MCU to respectively output a resistance signal, a switching value signal and a voltage signal required by a test instrument; the input end of the control unit MCU is connected to the output voltage of the instrument through the ADC acquisition module; the alarm signal output by the instrument to be tested is connected to the control unit MCU through the alarm signal acquisition module; the control unit MCU is connected with the upper computer module through a serial port circuit.
The upper computer module is used for outputting the corresponding setting parameters or control parameters of the control unit MCU and the signals uploaded to the upper computer module by the control unit MCU for display.
The control unit MCU is realized by adopting a singlechip, as shown in fig. 1, the application adopts a singlechip chip STC8A8K64D4 with PWM and ADC functions to realize the control unit MCU, wherein the singlechip is peripherally connected with a 74LS573 chip, the 74LS573 chip is used for data latching, the TL431 and a peripheral circuit form a voltage reference for ADC, and the P3.0 and the P3.1 are used as serial ports.
As shown in fig. 3, the single chip microcomputer is connected with the upper computer module through USB virtual serial communication, specifically: the control unit MCU is connected to the upper computer module through the magnetic isolation chip and the USB virtual serial port chip in sequence. The communication interface with the upper computer adopts a USB interface virtual serial port mode, the used chip is CH340B, and in order to further improve the reliability of serial port communication, the system adopts a magnetic isolation chip ADUM3201 between the CH340 and the singlechip.
In this embodiment, the circuit index to be implemented includes:
1. output four-way resistance signal
2. Output 30 paths of pilot lamp switching value signals (10 paths of positive control and 20 paths of negative control)
3. Output two voltage signals
4. Detecting two paths of overspeed signal input
5. Detecting a voltage signal input
The following will be described separately:
as shown in fig. 4, the pin schematic diagram of the 8255 chip is that the control unit MCU is implemented by using the single chip microcomputer, and the I O expansion is performed by the 8255 chip due to limited pin resources of the single chip microcomputer, as in the I/O expansion circuit shown in fig. 4, the chip is 8255.
As shown in fig. 5, which is a schematic diagram of resistance signal generation, the resistance output circuit includes a plurality of resistors and relays corresponding to each resistor, and an output end of the control unit MCU is connected with a control end of each relay; each resistor is connected in parallel with the normally open contact of the corresponding relay to form a resistor selection unit, and each resistor selection unit is sequentially connected in series, and resistor signal output terminals are led out from two ends of the resistor selection unit after being connected in series and used for outputting a resistor test signal to the instrument to be detected. In fig. 5, taking 4 channels as an example, each channel is 16 relays to switch 16 resistors with different weights, which are respectively 0.1Ω, 0.2Ω, 0.4Ω, 0.8Ω, 1Ω, 2Ω, 4Ω, 8Ω, 10Ω, 20Ω, 40Ω, 80Ω, 100deg.OMEGA, 200Ω, 400Ω and 800Ω, and by shorting the different resistors, the purpose of outputting the resistance values of 0.1Ω to 1666.5 Ω is achieved, and a single channel resistor circuit is shown in fig. 5. The output end of the MCU passes through I O ports expanded by 8255 chips, each I O port drives a coil of a relay through a 74HC07 chip, the relays are J1 … J16, driving of each relay is achieved, the resistors RP1 and … RP16 are resistors with different resistance values, the output ends of resistance signals are led out from two ends of the resistors RP1 and … RP16 after the resistors are sequentially connected in series, namely the normally open contacts of the relays are arranged at two ends of each resistor in parallel, namely the resistors RP1 and … RP16 correspond to J11 … J16; where J11 … J161 is the open contact of J1 … J16.
As shown in fig. 6, the bulb switching value output circuit includes a plurality of relays, one end of a normally open contact of each relay is grounded or powered, and the other end of the normally open contact of each relay is led out of a switching value output terminal; the output end of the control unit MCU is connected to the control end of each relay. The relays are normally open contacts of the relays respectively, thirty relays are arranged, the corresponding normally open contacts are JK1, JK2 … JK10, JK11 and JK12 … JK30 respectively, the power supply is led out of an output 1 end and an output 2 end … output 10 end respectively through JK1 and JK2 … JK10, and the power supply ground is led out of an output 11 end and an output 12 end … output 30 end respectively through JK11 and JK12 … JK 30. The output 1 end and the output 2 end … output 30 end are thirty paths of switch signal output ports. The normally open contact of each relay is controlled by the MCU.
As shown in fig. 7, a schematic diagram of two paths of digital control voltage signals is shown; the voltage output module comprises a DAC module and an operational amplifier circuit; the output end of the control unit MCU is connected with an operational amplifier, and the output end of the operational amplifier is used for outputting a voltage signal required by the instrument to be tested. The MCU outputs digital signals, which are converted into 0-2.5V voltage signals through TLC5615 DAC, the reference voltage of the DAC is 1.25V generated by TL432, then the digital signals are amplified through in-phase operational amplifier, digital control voltage of 0-5V is output after being amplified by field effect transistors Q1 and Q2,
the schematic diagram of the alarm signal acquisition module is shown in fig. 8, and the alarm signal acquisition module comprises two paths of input alarm signals and one path of meter output 5V voltage detection, wherein the two paths of alarm signals are taken as examples and one path of meter output 5V signal is taken as an example for explanation as shown in fig. 8. The two paths of alarm signals respectively comprise triodes Q3 and Q4; the base electrode of the triode Q3 is led out of an alarm signal input terminal through a resistor R11; the emitter electrode of the triode Q3 is grounded; the collector of the triode Q3 is connected with a power supply Vcc through a resistor R10; the power supply Vcc is connected to the anode of the diode D2 through a resistor R9, and the cathode of the diode D2 is connected to the alarm signal input terminal 2; and an alarm signal acquisition output terminal is output at a collector lead-out output terminal of the triode Q3.
The base electrode of the triode Q4 is led out of an alarm signal input terminal through a resistor R16; the emitter of the triode Q4 is grounded; the collector of the triode Q4 is connected with a power supply Vcc through a resistor R15; the power supply Vcc is connected to the anode of the diode D1 via the resistor R14, and the cathode of the diode D1 is connected to the alarm signal input terminal 1. And an alarm signal acquisition output terminal is output at a collector lead-out output terminal of the triode Q4. The alarm signal input terminal 1 and the alarm signal input terminal 2 are used for inputting different alarm signals.
The 5V voltage output by the instrument is directly input to an ADC1 pin of the MCU after passing through the setting programming circuit, and after ADC conversion by the MCU, the obtained data is sent to an upper computer for display. The tuning programming circuit is shown in fig. 8.
Aiming at a control unit MCU, a resistor output circuit, a bulb switching value output circuit, an alarm signal acquisition module, a voltage output module and an upper computer module, the following description is given one by one:
the system comprises an upper computer operating system, an MCU controller, 4 groups of resistor output modules, 30 indicator lamp switching value output modules, alarm signal detection, analog voltage input signal detection and analog voltage output circuits, wherein all data and parameters of equipment operation come from the upper computer operating system, the MCU control is responsible for explaining and executing operation instructions of the upper computer, a communication protocol is maintained, and all functional operations of the detection platform are completed through a hardware circuit.
1. MCU controller and communication circuit
The circuit diagram is as follows:
the system adopts singlechip chips STC8A8K64D4 and 74LS573 with PWM and ADC functions for data latching, TL431 and peripheral circuits form a voltage reference for ADC, and P3.0 and P3.1 are used as serial ports.
The communication interface with the upper computer adopts a USB interface virtual serial port mode, the used chip is CH340B, and in order to further improve the reliability of serial port communication, the system adopts a magnetic isolation chip ADUM3201 between the CH340 and the singlechip. The circuit is shown in fig. 2.
2. Resistor output circuit
Fig. 3 is an I/O expansion circuit, chip 8255, providing control signals for 64 relays of the resistor module and 30 relays of the indicator light module.
The resistor module has 4 channels, each channel is 16 relays to switch 16 resistors with different weights, the resistors are respectively 0.1 omega, 0.2 omega, 0.4 omega, 0.8 omega, 1 omega, 2 omega, 4 omega, 8 omega, 10 omega, 20 omega, 40 omega, 80 omega, 100 omega, 200 omega, 400 omega and 800 omega, the aim of outputting the resistance value of 0.1 omega-999.9 omega is achieved by shorting the different resistors, and a single channel resistor circuit is shown in figure 4.
3. Indicating lamp switching value circuit
The driving circuit part of the indicator lamp is basically the same as the driving part of the resistance output circuit, and enough I/O ports are expanded through 8255 to provide latching of data, and 30 switching values are output through a 74HC07 driving relay, wherein 10 paths are positive control and 20 paths are negative control, as shown in figure 5.
4. Voltage output signal circuit
The circuit diagram of the two paths of digital control voltage signals is as follows:
the MCU outputs digital signals, the digital signals are converted into 0-2.5V voltage signals through TLC5615 DAC, the reference voltage of the DAC is 1.25V generated by TL432, then the digital signals are amplified through in-phase operational amplifier, digital control voltages of 0-5V are output after the digital signals are amplified through field effect transistors Q1 and Q2, and R2 and R6 are current limiting resistors.
5. Overspeed signal and meter output 5V voltage detection
The circuit diagram is shown in fig. 7, overspeed signals are subjected to level conversion by Q3 and Q4 and then directly input into pins P3.7 and P4.0 of the MCU, and the states of the MCU readers are used as state signals to be sent to an upper computer for alarming.
The 5V voltage output by the instrument is directly input to an ADC1 pin of the MCU after setting and planning, and the MCU carries out ADC conversion to obtain data and sends the data to an upper computer for display.
It is obvious that the specific implementation of the present utility model is not limited by the above-mentioned modes, and that it is within the scope of protection of the present utility model only to adopt various insubstantial modifications made by the method conception and technical scheme of the present utility model.
Claims (6)
1. A signal system for comprehensive detection of a digital instrument, characterized in that: the device comprises a control unit MCU, a resistor output circuit, a bulb switching value output circuit, an alarm signal acquisition module, a voltage output module and an upper computer module, wherein the output end of the control unit MCU is respectively connected to the resistor output circuit, the bulb switching value output circuit and the voltage output module and used for controlling the control unit MCU to respectively output a resistor signal, a switching value signal and a voltage signal required by a test instrument; the input end of the control unit MCU is connected to the output voltage of the instrument through the ADC acquisition module; the alarm signal output by the instrument to be tested is connected to the control unit MCU through the alarm signal acquisition module; the control unit MCU is connected with the upper computer module through a serial port circuit.
2. A signaling system for integrated digital meter detection as set forth in claim 1, wherein: the control unit MCU is connected to the upper computer module through the magnetic isolation chip and the USB virtual serial port chip in sequence.
3. A signaling system for integrated digital meter detection as set forth in claim 1, wherein:
the resistor output circuit comprises a plurality of resistors and relays corresponding to the resistors, and the output end of the control unit MCU is connected with the control end of each relay; each resistor is connected in parallel with the normally open contact of the corresponding relay to form a resistor selection unit, and each resistor selection unit is sequentially connected in series, and resistor signal output terminals are led out from two ends of the resistor selection unit after being connected in series and used for outputting a resistor test signal to the instrument to be detected.
4. A signaling system for integrated digital meter detection as set forth in claim 1, wherein:
the bulb switching value output circuit comprises a plurality of relays, one end of a normally open contact of each relay is grounded or powered, and the other end of the normally open contact of each relay is led out of a switching value output terminal; the output end of the control unit MCU is connected to the control end of each relay.
5. A signaling system for integrated digital meter detection as set forth in claim 1, wherein: the alarm signal acquisition module comprises at least two alarm acquisition branches, each alarm acquisition branch comprises a triode Q3, and the base electrode of the triode Q3 is led out of an alarm signal input terminal through a resistor R11; the emitter electrode of the triode Q3 is grounded; the collector of the triode Q3 is connected with a power supply Vcc through a resistor R10; the power supply Vcc is connected to the anode of the diode D2 via the resistor R9, and the cathode of the diode D2 is connected to the alarm signal input terminal.
6. A signaling system for integrated digital meter detection as set forth in claim 1, wherein: the voltage output module comprises a DAC module and an operational amplifier circuit;
the output end of the control unit MCU is connected with an operational amplifier, and the output end of the operational amplifier is used for outputting a voltage signal required by the instrument to be tested.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321776822.XU CN220542118U (en) | 2023-07-07 | 2023-07-07 | Signal system for comprehensive detection of digital instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321776822.XU CN220542118U (en) | 2023-07-07 | 2023-07-07 | Signal system for comprehensive detection of digital instrument |
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| CN220542118U true CN220542118U (en) | 2024-02-27 |
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| CN202321776822.XU Active CN220542118U (en) | 2023-07-07 | 2023-07-07 | Signal system for comprehensive detection of digital instrument |
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- 2023-07-07 CN CN202321776822.XU patent/CN220542118U/en active Active
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