CN114966514B - Single-chip voltage signal generator of fuel cell and control method thereof - Google Patents
Single-chip voltage signal generator of fuel cell and control method thereof Download PDFInfo
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- CN114966514B CN114966514B CN202210894455.7A CN202210894455A CN114966514B CN 114966514 B CN114966514 B CN 114966514B CN 202210894455 A CN202210894455 A CN 202210894455A CN 114966514 B CN114966514 B CN 114966514B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention discloses a fuel cell monolithic voltage signal generator and a control method thereof, relating to the technical field of fuel cell detection, comprising a regulating transformer, a bridge rectifier and a filter which are connected in sequence, and also comprising an adjustable potentiometer and a test signal generation module, wherein the adjustable potentiometer is respectively connected with the filter and the test signal generation module; compared with the prior art, the invention has low realization difficulty and high integration degree of functional components, and can completely and really dynamically simulate hundreds of single-chip voltage values of the fuel cell stack.
Description
Technical Field
The invention relates to the technical field of fuel cell detection, in particular to a fuel cell monolithic voltage signal generator and a control method thereof.
Background
One of the new energy sources being developed and utilized is a fuel cell, which utilizes the chemical reaction between fuel and oxygen in air to generate electric current, wherein the hydrogen fuel cell has a simpler structure and is an early research and promotion, and hydrogen is used as fuel to continuously supply power. The direct hydrogen fuel cell pile is formed by connecting a plurality of single fuel cells in series, and voltage inspection is an important link in the operation of the hydrogen fuel cell pile, because the change of each operating parameter of a fuel cell system is reflected on the working voltage of each single cell in a battery pack, the precursor of the abnormal operation of the battery pack caused by various faults is also reflected on the working voltage change of a certain cell in the battery pack firstly. Meanwhile, when the battery system runs, the voltage of each single battery of the battery pack is monitored, the reason for the change is analyzed according to the change of the working voltage of a certain single battery when the battery pack outputs stable power, and some measures are adopted before the battery pack fails to work, so that the failure is strived to be eliminated, and the battery pack is recovered to a normal working state. For example, when the voltage of a certain cell suddenly drops, liquid water may accumulate at the outlet of the single cell, which may cause accumulation of gas in the cell air chamber at the outlet, and at this time, short-time pulse exhaust may be adopted to discharge the liquid water accumulated at the outlet of the single cell, so that the battery pack can recover to normal operation.
Generally, it is relatively easy to monitor the cell voltage for a small galvanic pile, because the flow field distribution inside the small galvanic pile is relatively uniform, when the gas enters the cell from the gas inlet, the pressure distribution of the gas is uniform, the pressure drop is small, the liquid water accumulated in the cavity is easily discharged by the high-pressure gas, the voltage conversion of the galvanic pile directly reflects the change of each single cell of the cell, and the obvious change of the voltage of the single cell directly causes the change of the total voltage. In this case, we can directly measure the total voltage to evaluate the battery operation condition. Under the condition that the number of the batteries which are connected in series and overlapped is large, the pressure drop of a gas pipeline in the pile is large compared with that of a long gas pipeline, and the pressure of gas entering a battery cavity is extremely uneven due to the nonuniformity of multiple batteries caused by processing, so that the voltage of each single chip is uneven. Obvious single-chip voltage changes are often extremely individual, the change conditions have various expression states and are difficult to be detected in the total voltage, the death of one single-chip battery can cause the breakdown of the whole electric pile, and the single-chip voltage polling instrument CVM is professional on-line real-time detection equipment developed for monitoring the voltage of each single-chip battery.
In order to solve the problems that after the single-chip voltage polling instrument CVM is produced, the real product performance and the monitoring capability reliability of the single-chip voltage polling instrument CVM are detected and determined, the capability of the single-chip voltage polling instrument CVM for identifying and processing abnormal voltage needs to be tested in advance, and therefore the CVM test of the fuel cell stack single-chip voltage polling instrument becomes necessary.
Disclosure of Invention
The present invention provides a fuel cell monolithic voltage signal generator and a control method thereof, which aims to solve the technical problems in the related art to a certain extent.
In order to achieve the purpose, the invention adopts the technical scheme that:
a fuel cell monolithic voltage signal generator comprises a voltage regulating transformer, a bridge rectifier and a filter, wherein the voltage regulating transformer, the bridge rectifier and the filter are sequentially connected, the signal generator also comprises an adjustable potentiometer and a test signal generation module, the adjustable potentiometer is respectively connected with the filter and the test signal generation module, the test signal generation module is provided with a resistance network, a resistance network gate, a decoder, a CPU and a CAN bus, the resistance network gate, the decoder and the CPU are sequentially connected, the CPU is communicated with the CAN bus, the resistance network is provided with at least two resistance units which are connected in series or in parallel, two ends of each resistance unit are respectively provided with a test voltage connection point for sending signals outwards, the test voltage connection points are correspondingly connected with a connection terminal, and the connection terminal is connected with a monolithic voltage inspection instrument through a wiring harness;
the signal generator is also provided with an upper computer, and the CPU is connected with the upper computer through a CAN bus.
On the basis of the technical scheme, the resistance network is provided with at least one light isolation relay, and one end of the light isolation relay is connected with the input end of the low-voltage power supply.
On the basis of the technical scheme, the signal generator is provided with at least two test voltage connection points and wiring terminals, and the test voltage connection points and the wiring terminals are in one-to-one correspondence.
On the basis of the technical scheme, the resistance network is provided with at least two groups of resistance units which are connected in series or in parallel or in series-parallel combination.
On the basis of the technical scheme, the resistance network is provided with N groups of resistance units, wherein N is more than or equal to 2, and the serial numbers are R in sequence1、R2、R3、……RNWherein at least one group of the resistance units RNConnected in parallel with a resistor RN-1And RN-2，RN-1Is connected with an optical isolation relay TN-1，RN-2Is connected with a light-isolating relay TN-2。
On the basis of the technical scheme, the optical isolation relay is an optocoupler relay or a solid-state relay.
On the basis of the technical scheme, the test voltage connection point is a voltage measurement interface and used for measuring the voltage of the corresponding resistance unit, and the wiring terminals are positive and negative electrode wiring ports of the test voltage connection point.
On the basis of the technical scheme, the adjustable potentiometer is a slide rheostat.
Based on the technical scheme, the control method of the fuel cell single-chip voltage signal generator is characterized in that a resistance network is provided with N groups of resistance units, wherein N is more than or equal to 2, and the serial numbers are sequentially R1、R2、R3、……RN-2、RN-1、RN，
Wherein R is21Connected in parallel with a resistor R21-1And R21-2，R21-1Is connected with a light-isolating relay T21-1，R21-2Is connected with a light-isolating relay T21-2(ii) a Resistance R23Is provided with a series resistor R23-1Resistance R23-1Parallel optical isolation relay T23-1；
Resistance R81Connected in parallel with a resistor R81-1And R81-2Resistance R81-1Is connected with a light-isolating relay T81-1Resistance R81-2Is connected with a light-isolating relay T81-2(ii) a Resistance R83Is provided with a series resistor R83-1Resistance R83-1Parallel optical isolation relay T83-1；
The control method comprises the following steps:
S1、T23-1、T83-1closed, T21-1、T21-2、T81-1、T81-2Disconnecting, and simulating a signal state when the voltage of the single cell of the galvanic pile is normal;
S2、T22、T82closing, simulating the signal state when the signal line for connecting the single-chip voltage polling instrument and the galvanic pile is completely connected;
S3、T22、T82cutting off, simulating the disconnection state of a signal line connecting the single-chip voltage polling instrument and the electric pile, and diagnosing the disconnection state by the single-chip voltage polling instrument;
S4、T21-1、T21-2closing to realize multi-resistor parallel connection, reducing resistance value and R21Voltage value V ofR21Descent, simulation VR21The single chip voltage is interfered to generate a signal state with a reduced voltage value;
T81-1、T81-2closing to realize multi-resistor parallel connection, decrease resistance value, and decrease resistance R81Voltage value V ofR81Descent, simulation VR81The voltage of the single chip is interfered to generate a signal state with a reduced voltage value;
S5、T23-1opening, R23-1And R23Series connection, increased resistance and R resistance81Voltage value V ofR23Rise, simulation VR23The single chip voltage is interfered to generate a signal state with a rising voltage value;
T83-1opening, R83-1And R83Series connection, increased resistance and R resistance83Voltage value V ofR83Rise, simulation VR83The voltage of the single chip is interfered to generate a signal state with a rising voltage value;
s6, changing T by using upper computer program21-1、T21-2Or T81-1、T81-2Closed open frequency, analog VR21Or VR81The single-chip voltage is interfered by pulse signals with different frequencies to generate a pulse signal state with a reduced single-chip voltage value;
changing T with upper computer program22Or T82Closing the disconnection frequency, and simulating the signal state of disconnection when the single-chip voltage polling instrument is connected with a signal wire of the galvanic pile;
changing T by upper computer program23-1Or T83-1Closed open frequency, analog VR23Or VR83The voltage of the single chip is interfered by pulse signals with different frequencies to generate a pulse signal state with the rising voltage value of the single chip.
Compared with the prior art, the invention has the advantages that:
(1) Compared with the prior art, the fuel cell monolithic voltage signal generator has low realization difficulty and high integration degree of functional components, and can completely and truly dynamically simulate hundreds of monolithic voltage values of a fuel cell stack; the dynamic change of the single-chip voltage value when the galvanic pile is started can be simulated through the program control of the upper computer, the dynamic change of the single-chip voltage value when the galvanic pile is loaded or unloaded is simulated, the dynamic change of the single-chip voltage value when the galvanic pile is subjected to interference signals is simulated, the development and the production of the fuel cell single-chip voltage patrol instrument are realized without testing and inspecting on a real galvanic pile, the cost is saved, the test signal generator completely and truly reproduces hundreds of single-chip voltage dynamic values of the galvanic pile, and the test signal generator is a necessary detecting instrument device for developing and producing the single-chip voltage patrol instrument.
(2) The control method of the fuel cell single-chip voltage signal generator can effectively reflect the reliability of the patrol instrument for testing the voltage characteristics of the fuel cell single chip under different environmental conditions, and can intuitively reflect the strength of the patrol instrument for monitoring the voltage capability of the fuel cell single chip.
Drawings
FIG. 1 is a schematic diagram of a fuel cell monolithic voltage signal generator according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a resistor network according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a dc power supply in an embodiment of the invention.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "connected" and "connecting" are used in a broad sense, and for example, they may be mechanically or electrically connected, or they may be connected through two elements, directly or indirectly via an intermediate, and those skilled in the art will understand the specific meaning of the above terms according to specific situations.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in themselves. Thus, "module" and "component" may be used in a mixture.
Referring to fig. 1, a schematic structural diagram of a fuel cell monolithic voltage signal generator according to an embodiment of the present invention includes a voltage regulating transformer, a bridge rectifier and a filter, where the voltage regulating transformer, the bridge rectifier and the filter are connected in sequence, and is characterized in that: the generator also comprises an adjustable potentiometer and a test module, wherein the adjustable potentiometer is respectively connected with the filter and the test module, the test module is provided with a resistance network, a resistance network gating device, a decoder, a CPU and a CAN bus, the resistance network gating device, the decoder and the CPU are sequentially connected, the CPU is communicated with the CAN bus, the resistance network is provided with external test points, the external test points are correspondingly connected with wiring terminals, the resistance network is provided with resistance units, and the resistance units are provided with one external test point;
signal generator still is equipped with the host computer, and CPU passes through the CAN bus and links to each other with the host computer, and CPU carries out data processing to the order and the voltage signal that the host computer was assigned, and the CAN bus is applicable to the work scene of hydrogen fuel cell patrol instrument, needs to monitor the voltage of a large amount of monolithic batteries in this application embodiment, needs big data bulk short distance communication, and the real-time requirement is than higher moreover, and each node is equal, and the host computer passes through the CAN bus and realizes communication and control.
The resistance network gating device receives an instruction signal of an upper computer and realizes the simulation of each single-chip voltage of the galvanic pile in different states by controlling the on-off of the light isolation relay, the resistance network is provided with at least one light isolation relay, one end of the inlet of the light isolation relay is connected with the low-voltage input end, and the low-voltage power supply supplies power to the light isolation relay at low voltage.
The signal generator is provided with at least two external testing and wiring terminals, and the external testing and wiring terminals correspond to each other one by one.
The resistance network is provided with at least two groups of resistance units which are sequentially connected in series or in parallel or in series-parallel combination.
The resistance network is provided with N groups of resistance units, wherein N is more than or equal to 2, and the serial numbers are R in sequence1、R2、R3、……RNWherein at least one resistance unit RNConnected in parallel with a resistor RN-1And RN-2，RN-1Is connected with a light-isolating relay TN-1，RN-2Is connected with a light-isolating relay TN-2(ii) a Or resistance RNIs connected in parallel withResistance RN-1And RN-2Resistance RN-1Is connected with a light-isolating relay TN-1Resistance RN-2Is connected with an optical isolation relay TN-2。
The resistor network in the embodiment corresponds to a monolithic voltage simulating a hydrogen fuel cell, wherein each resistor unit corresponds to one monolithic voltage, and the voltage of each resistor unit is set to be on or off or changed, so that the change of the monolithic voltage in a use state is simulated.
The light isolation relay is an optocoupler relay or a solid-state relay. Because the input and the output of the optocoupler relay are isolated from each other, the electrical signal transmission has the characteristics of unidirectionality and the like, thereby having good electrical insulation capability and anti-interference capability. The device can be used as an interface device for signal isolation in computer digital communication and real-time control, and can greatly improve the working reliability of a computer. The optical coupler mainly realizes signal one-way transmission, the input end and the output end are completely electrically isolated, the output signal has no influence on the input end, the anti-interference capability is strong, the work is stable, no contact is made, the service life is long, and the transmission efficiency is high.
The solid-state relay is a new type of contactless switch device composed of all solid-state electronic components, and it uses the switching characteristics of electronic components (such as switching triode, bidirectional thyristor, etc. semiconductor devices) to achieve the purpose of connecting and disconnecting circuit without contact and spark, so it is also called "contactless switch". The solid state relay is the fastest of the relays today, but its turn-off (or turn-on) time is also in the order of ms, say 20ms, at a minimum. Because the turn-off of the solid state relay requires the negative half cycle of the ac power supply to complete, the half cycle of 50Hz ac also has 10ms.
The external test point is a voltage measurement interface and is used for measuring the voltage of the corresponding resistance unit, and the wiring terminals are positive and negative wiring ports of the test point. Binding post is used for realizing electrical connection connector accessory, along with industrial automation degree is higher and industrial control requires stricter and stricter, accurate more and more, binding post's application range is more and more, can select for use in this embodiment five metals terminal, nut terminal, spring terminal etc..
The adjustable potentiometer is a sliding rheostat, the adjustable potentiometer changes the resistance value of the adjustable potentiometer to enable the voltage at two ends of a load connected in series with the adjustable potentiometer to change, namely the voltage of the resistance network in the embodiment is changed, and the adjustable potentiometer is one of the technical means for achieving the simulation of voltage change in the application. The adjustable potentiometer is a variable resistor for voltage division, and is divided into a linear potentiometer (in a linear relation) and a function potentiometer (in a curve relation) according to the relation between the output voltage ratio and the input voltage ratio and the rotation angle.
Referring to fig. 2, which is a schematic circuit diagram of a resistor network according to an embodiment of the present invention, a method for testing a fuel cell monolithic voltage signal generator includes providing N sets of resistor units, which are numbered as R in sequence1、R2、R3、……RN-2、RN-1、RNThe voltage of the resistance unit is V in sequenceR1、VR2、VR3、……VRNThe resistance units are correspondingly connected with resistors in series or in parallel and are sequentially numbered as R1-1、R2-1、R3-1、……RN-1(ii) a The resistance units are correspondingly connected with the light isolation relays in series or in parallel and are sequentially numbered as T1-1、T2-1、T3-1……TN. Wherein R in this embodiment21Connected in parallel with a resistor R21-1And R21-2，R21-1Is connected with a light-isolating relay T21-1，R21-2Is connected with an optical isolation relay T21-2Resistance R81Connected in parallel with a resistor R81-1And R81-2Resistance R81-1Is connected with an optical isolation relay T81-1Resistance R81-2Is connected with a light-isolating relay T81-2Resistance R83Is provided with a series resistor R83-1Resistance R83-1Parallel optical isolation relay T83-1(ii) a Fig. 3 is a schematic diagram of a dc power supply for providing low voltage power to an opto-isolated relay in an embodiment of the present invention.
Each resistance unit simulates the voltage signal state of a single-chip voltage, the real state of the single-chip voltage is simulated by changing different states of different resistances, and the voltage states which can be detected by the single-chip voltage polling instrument are divided into 6 simulation states according to different fluctuation characteristics; normal state fluctuation, load and unload state fluctuation, line disconnection state fluctuation, disturbed state fluctuation, startup no-load state fluctuation and pulse signal disturbance state fluctuation.
The method in the embodiment specifically comprises the following steps:
the resistance network is provided with N groups of resistance units, wherein N is more than or equal to 2, and the serial numbers are R in sequence1、R2、R3、……RN-2、RN-1、RN，
Wherein R is21Connected in parallel with a resistor R21-1And R21-2，R21-1Is connected with a light-isolating relay T21-1，R21-2Is connected with a light-isolating relay T21-2(ii) a Resistance R23Is provided with a series resistor R23-1Resistance R23-1Parallel optical isolation relay T23-1；
Resistance R81Connected in parallel with a resistor R81-1And R81-2Resistance R81-1Is connected with a light-isolating relay T81-1Resistance R81-2Is connected with a light-isolating relay T81-2(ii) a Resistance R83Is provided with a series resistor R83-1Resistance R83-1Parallel optical isolation relay T83-1；
The control method comprises the following steps:
S1、T23-1、T83-1closed, T21-1、T21-2、T81-1、T81-2Disconnecting, and simulating a signal state when the voltage of the single cell of the galvanic pile is normal;
S2、T22、T82closing the circuit, simulating the signal state when the signal line for connecting the single-chip voltage polling instrument and the galvanic pile is completely connected, wherein all detection voltages in the circuit are normal, and the fluctuation state accords with the general power state of the hydrogen fuel cell;
S3、T22、T82disconnecting, simulating the signal line connecting the single-chip voltage polling instrument and the galvanic pile (such as X)22A line connection line) is in a broken state, and a single-chip voltage polling instrument is used for diagnosing the broken state; such as simulating the movementWhen the system is shut down (the load is cut off, the hydrogen source is closed), the voltage value of the single chip is firstly quickly increased and then gradually decreased to a low-voltage protection value state;
S4、T21-1、T21-2closing to realize multi-resistor parallel connection, reducing resistance value, VR21Value drop, simulation VR21The single chip voltage is interfered to generate a signal state with a reduced voltage value;
T81-1、T81-2closing to realize multi-resistor parallel connection, reducing resistance value, VR81Value drop, simulation VR81The voltage of the single chip is interfered to generate a signal state with a reduced voltage value;
S5、T23-1opening, R23-1And R23Series connection, increase of resistance value, VR23Rise of voltage value, simulation VR23The single chip voltage is interfered to generate a signal state with a rising voltage value; if the rapid rising (no-load) state of each single-chip voltage value in the starting process of the simulated galvanic pile is adopted;
T83-1opening, R83-1And R83Series connection, increase of resistance value, VR83Rise in voltage value, analog VR83The voltage of the single chip is interfered to generate a signal state with a rising voltage value;
s6, changing T by using upper computer program21-1、T21-2Or T81-1、T81-2Frequency of closing and opening, able to simulate VR21Or VR81The single-chip voltage is interfered by pulse signals with different frequencies to generate a pulse signal state with a reduced single-chip voltage value;
changing T by using upper computer program22Or T82The on-off frequency can simulate the on-off signal state when the single-chip voltage polling instrument is connected with a signal wire of the galvanic pile;
changing T by using upper computer program23-1Or T83-1Frequency of closing and opening, able to simulate VR23Or VR83The voltage of the single chip is interfered by pulse signals with different frequencies to generate a pulse signal state with the rising voltage value of the single chip.
The technical solution shown in this example is only a specific example for explaining the inventive concept of the present application, and for example, the number or form of series and parallel connections of resistors and the on/off state of the light isolation relay control circuit may be set arbitrarily.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (7)
1. The utility model provides a fuel cell monolithic voltage signal generator, includes regulating transformer, bridge rectifier and filter, and wherein regulating transformer, bridge rectifier and filter link to each other in proper order, its characterized in that: the signal generator also comprises an adjustable potentiometer and a test signal generation module, wherein the adjustable potentiometer is respectively connected with the filter and the test signal generation module, the test signal generation module is provided with a resistance network, a resistance network gate, a decoder, a CPU and a CAN bus, the resistance network gate, the decoder and the CPU are sequentially connected, the CPU is communicated with the CAN bus, the resistance network is provided with at least two resistance units, two ends of each resistance unit are respectively provided with a test voltage connection point for sending signals to the outside, the test voltage connection points are correspondingly connected with a wiring terminal, and the wiring terminal is connected with the single-chip voltage inspection instrument through a wiring harness; at least one resistance unit is connected with an optical isolation relay in parallel or in series, the signal generator is also provided with an upper computer, and the CPU is connected with the upper computer through a CAN bus;
the series-parallel connection form and the number of the resistance units in the resistance network are controlled and changed through the resistance network gating device, the resistance units realize different voltage changes through the on-off control of the light isolation relay, a continuously changed single-chip voltage signal is simulated, the on-off frequency of the resistance units is controlled through an upper computer program, the resistance units realize high-frequency and low-frequency voltage fluctuation, and the single-chip voltage signal with intermittent interference and pulse change is simulated; the resistance network is provided with N groups of resistance units, wherein N is more than or equal to 2, and the serial numbers are R in sequence1、R2、R3、……RN-2、RN-1、RN，
Wherein R is21Connected in parallel with a resistor R21-1And R21-2，R21-1Is connected with an optical isolation relay T21-1，R21-2Is connected with a light-isolating relay T21-2(ii) a Resistance R23Is provided with a series resistance R23-1Resistance R23-1Parallel optical isolation relay T23-1(ii) a Resistance R22A light isolation relay T is connected in series between the corresponding test voltage connection point22，R82A light isolation relay T is connected in series between the corresponding test voltage connection point82；
Resistance R81Connected in parallel with a resistor R81-1And R81-2Resistance R81-1Is connected with an optical isolation relay T81-1Resistance R81-2Is connected with a light-isolating relay T81-2(ii) a Resistance R83Is provided with a series resistor R83-1Resistance R83-1Parallel optical isolation relay T83-1；
The control method comprises the following steps:
S1、T23-1、T83-1closed, T21-1、T21-2、T81-1、T81-2Disconnecting to simulate the signal state of the single-chip electric pile when the voltage is normal;
S2、T22、T82closing, simulating the signal state when the signal wire for connecting the single-chip voltage polling instrument and the galvanic pile is connected perfectly;
S3、T22、T82cutting off, simulating the disconnection state of a signal line connecting the single-chip voltage polling instrument and the electric pile, and diagnosing the disconnection state by the single-chip voltage polling instrument;
S4、T21-1、T21-2closing to realize multi-resistor parallel connection, reducing resistance value and R21Voltage value V ofR21Descent, simulation VR21The voltage of the single chip is interfered to generate a signal state with a reduced voltage value;
T81-1、T81-2closing to realize multi-resistor parallel connection, decrease resistance value, and decrease resistance R81Voltage value V ofR81Descent, simulation VR81Road single sheet voltage is disturbedSo as to generate a signal state with a reduced voltage value;
S5、T23-1breaking, R23-1And R23Series connection, increased resistance and R resistance81Voltage value V ofR23Rise, simulation VR23The voltage of the single chip is interfered to generate a signal state with a rising voltage value;
T83-1opening, R83-1And R83Series connection, increased resistance and R resistance83Voltage value V ofR83Rise, simulation VR83The voltage of the single chip is interfered to generate a signal state with a rising voltage value;
s6, changing T by using upper computer program21-1、T21-2Or T81-1、T81-2Closed open frequency, analog VR21Or VR81The single-chip voltage is interfered by pulse signals with different frequencies to generate a pulse signal state with a single-chip voltage value reduced;
changing T with upper computer program22Or T82Closing and opening frequency, and simulating the signal state of opening and closing when the single-chip voltage polling instrument is connected with a signal wire of the electric pile;
changing T with upper computer program23-1Or T83-1Closed open frequency, analog VR23Or VR83The voltage of the single chip is interfered by pulse signals with different frequencies to generate a pulse signal state with a rising single chip voltage value.
2. A fuel cell monolithic voltage signal generator as defined in claim 1, wherein: the resistance network is provided with at least one light isolation relay, and one end of the light isolation relay is connected with the input end of the low-voltage power supply.
3. A fuel cell monolithic voltage signal generator as defined in claim 1, wherein: the signal generator is provided with at least two test voltage connection points and wiring terminals, and the test voltage connection points and the wiring terminals are in one-to-one correspondence.
4. A fuel cell monolithic voltage signal generator as defined in claim 1, wherein: the resistance network is provided with at least two groups of resistance units which are connected in series or in parallel or in series-parallel combination.
5. A fuel cell monolithic voltage signal generator as defined in claim 1, wherein: the light isolation relay is an optocoupler relay or a solid-state relay.
6. A fuel cell monolithic voltage signal generator as defined in claim 1, wherein: the test voltage connection point is a voltage measurement interface and is used for measuring the voltage of the corresponding resistance unit, and the wiring terminal is a positive and negative wiring port of the test voltage connection point.
7. A fuel cell monolithic voltage signal generator as defined in claim 1, wherein: the adjustable potentiometer is a slide rheostat.
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