CN113009249A - Charging pile component fault diagnosis method - Google Patents

Abstract

The invention provides a charging pile component fault diagnosis method in the technical field of electric automobiles, which comprises the following steps: step S10, acquiring power output current of the power unit and a switch control signal of the relay, acquiring voltage of a first end of the relay, and sending the voltage to the charge controller to diagnose the working state of the relay to generate a first diagnosis result; step S20, collecting the voltage of the second end of the fuse and a relay K₀The third terminal voltage, the charging current of the fuse and the charging controller to the fuse and the relay K₀Is diagnosed to generate a second diagnosis result(ii) a Step S30, the charging controller adjusts the power output current of each power unit based on the current adjustment rule, collects the voltage drop of each component, calculates the resistance of each component, and draws a resistance curve; in step S40, the charge controller saves the diagnosis result and the resistance curve. The invention has the advantages that: the efficiency of component failure diagnosis has greatly been promoted.

Description

Charging pile component fault diagnosis method

Technical Field

The invention relates to the technical field of electric automobiles, in particular to a fault diagnosis method for a charging pile component.

Background

The electric vehicle (BEV) is a vehicle driven by a vehicle-mounted power supply and driven by a motor to run, meets various requirements of road traffic and safety regulations, has smaller influence on the environment compared with the traditional vehicle, has wide prospect, and becomes a development trend in the future. Along with the development of electric automobile, electric automobile's the demand of charging increases day by day, and the construction quantity of filling electric pile presents the explosive growth.

The charging pile has the defects that the charging safety of the electric automobile and the user experience are directly influenced, and therefore the charging pile needs to be diagnosed and positioned. However, when charging pile breaks down, operation and maintenance personnel are required to perform a series of detection work on the charging pile to diagnose the specific component with the fault, so that the efficiency is low, users are provided with one less charging pile, and the charging waiting time is prolonged.

Therefore, how to provide a method for diagnosing faults of components of a charging pile, and the efficiency of diagnosing faults of the components are improved, becomes a problem to be solved urgently.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a method for diagnosing faults of components of a charging pile, so that the efficiency of diagnosing faults of the components is improved.

The invention is realized by the following steps: a fault diagnosis method for components of a charging pile comprises the following steps:

step S10, the power detector obtains the power output current of each power unit and the switch control signal of each relay through the power controller, and collects the relay K₁To relay K_mAnd sending the first terminal voltage to the charge controller; the charging controller outputs current, first terminal voltage and switch control signal based on the power output current, the first terminal voltage and the switch control signal to the relay K₁To relay K_mThe working state of the system is diagnosed to generate a first diagnosis result;

step S20, the power detector collects the voltage of the second end of the fuse and the relay K₀The voltage of the third end of the fuse and the charging current of the fuse are sent to a charging controller; the charging controller is used for charging the fuse and the relay K based on the second terminal voltage, the third terminal voltage and the charging current₀The working state of the system is diagnosed to generate a second diagnosis result;

step S30, the charging controller creates a current regulation rule, based on the current regulation rule, the power output current of each power unit is regulated through the power detector, the voltage drop of each component is collected through the power detector, the resistance of each component is further calculated, and a resistance curve is drawn;

step S40, the charging controller saves the first diagnosis result, the second diagnosis result and the resistance curve;

the step S10, the step S20 and the step S30 are not in sequence.

Further, the step S10 specifically includes:

step S11, the power detector obtains the power output current I of each power unit through the power controller_nAnd a switch control signal C of each relay_m(ii) a Wherein n represents the number of the power unit and is a positive integer; m represents the number of the relay and is a positive integer; c_mThe value of (1) is 0 or 1, the value of 0 represents that the relay is disconnected, and the value of 1 represents that the relay is closed;

step S12, collecting relay K by power detector₁To relay K_mFirst terminal voltage V_mAnd outputting the powerCurrent I_nFirst terminal voltage V_mAnd a switch control signal C_mSending the data to a charging controller;

step S13, the charge controller outputs a current I based on each of the power outputs_nAnd a first terminal voltage V_mSeparately calculating relays K₁To relay K_mPower P of_m：P_m＝V_m*I_n；

Step S14, the charging controller prestores a first power standard range, and the charging controller determines the power P_mIf yes, go to step S15; if not, go to step S17;

step S15, the charge controller determines the switch control signal C_mIf yes, generating a first diagnosis result that the relay switch is turned off; if not, go to step S16;

step S16, the charge controller determines power P_mWhether the power is within a first power standard range or not, if so, generating a first diagnosis result with normal power; if not, generating a first diagnosis result of the abnormal power;

step S17, the charge controller determines the switch control signal C_mIf yes, generating a first diagnosis result that the relay switch acts normally; if not, generating a first diagnosis result that the relay switch is turned off.

Further, the step S20 specifically includes:

step S21, the power detector collects the voltage V of the second end of the fuse_FUSERelay K₀Voltage V at the third terminal_K0Charging current I of fuse₀And applying the second terminal voltage V_FUSEA third terminal voltage V_K0And a charging current I₀Sending the data to a charging controller;

step S22, the charging controller bases on the second end voltage V_{FUSE and}and a charging current I₀Calculating power P of fuse_FUSE：P_FUSE＝V_FUSE*I₀；

Step S23, charging controllerPre-storing a second power standard range, and judging P by the charging controller_FUSEWhether the power of the fuse is within a second power standard range or not is judged, and if yes, a second diagnosis result that the power of the fuse is normal is generated; if not, generating a second diagnosis result of the abnormal power of the fuse;

step S24, the charging controller bases on the third terminal voltage V_K0And a charging current I₀Calculating relay K₀Power P of_K0：P_K0＝V_K0*I₀；

Step S25, the charging controller obtains the relay K₀Switch control signal C_K0，C_K0The value of (1) is 0 or 1, the value of 0 represents that the relay is disconnected, and the value of 1 represents that the relay is closed;

step S26, the charging controller prestores a third power standard range, and the charging controller determines the power P_K0If yes, go to step S27; if not, go to step S29;

step S27, the charge controller determines the switch control signal C_K0If yes, generating a second diagnosis result that the relay switch is turned off; if not, go to step S28;

step S28, the charge controller determines power P_K0Whether the power is within a third power standard range or not, if so, generating a second diagnosis result with normal power; if not, generating a second diagnosis result of the abnormal power;

step S29, the charge controller determines the switch control signal C_K0If yes, generating a second diagnosis result that the relay switch acts normally; and if not, generating a second diagnosis result of the relay switch closing rejection.

Further, the step S30 specifically includes:

step S31, the charging controller prestores a plurality of standard resistance curves, the charging controller creates a current regulation rule, and based on the current regulation rule, the power output current I of each power unit is regulated by the power detector_n；

Step S32, step CThe over-power detector collects the voltage drop U of each component_aBased on said voltage drop U_aAnd a power output current I_nCalculating the resistance R of each component_a：R_a＝(U_a1-U_a2)/(I_n1-I_n2)；

Step S33, the charging controller outputs current I based on the power_nAnd a resistance R_aAnd drawing a resistance curve, and monitoring the resistance curve in real time based on the standard resistance curve.

Further, in step S30, the current adjustment rule is specifically:

setting a current decreasing proportion, and sequentially decreasing the power output current of each power unit from the rated power based on the current decreasing proportion.

Further, in step S30, the components are a fuse and a relay K₀Relay K₁… … or Relay K_m。

Further, the step S40 is specifically:

and the charging controller stores the first diagnosis result, the second diagnosis result and the resistance curve, and displays the first diagnosis result, the second diagnosis result and the resistance curve through a display screen.

The invention has the advantages that:

the working state of each relay can be quickly judged by collecting the voltage and current of each relay to calculate power and combining the switch control signal and the power standard range of each relay; the working state of the fuse can be quickly judged by collecting the voltage and the current of the fuse to calculate the power and combining the standard range of the power of the fuse; the power output current of each power unit is sequentially decreased from the rated power based on the current decreasing proportion, the voltage drop of each component is collected, the resistance of each component is calculated to draw a resistance curve, the resistance of each component under different currents is monitored in real time, when a charging pile breaks down, the broken component can be immediately judged, a series of detection work on the charging pile in the prior art is not needed, and the component failure diagnosis efficiency is greatly improved.

Drawings

The invention will be further described with reference to the following examples with reference to the accompanying drawings.

Fig. 1 is a flowchart of a method for diagnosing faults of components of a charging pile according to the present invention.

Fig. 2 is a schematic block circuit diagram of the charging pile of the present invention.

Fig. 3 is a schematic block circuit diagram of the relay of the present invention.

Detailed Description

The technical scheme in the embodiment of the application has the following general idea: calculating power by collecting voltage and current of each relay, and detecting each relay by combining a switch control signal and a power standard range of each relay, wherein the power is greater than 0, the value of the switch control signal is 1, the power is in the power standard range, or the power is 0, and the power is normal under the condition that the value of the switch control signal is 0; calculating power by collecting voltage and current of the fuse, and detecting the fuse by combining the standard range of the power of the fuse; the power output current of each power unit is sequentially decreased from the rated power based on the current decreasing proportion, then the voltage drop of each component is collected, and then the resistance of each component is calculated to draw a resistance curve, so that the resistance of each component under different currents is monitored in real time, the component with a fault can be judged by simple steps, and the efficiency of fault diagnosis and positioning of the component is improved.

Referring to fig. 2 to 3, the charging pile of the present invention includes an ac power source, and a plurality of power units G_nA plurality of relays K_mA power controller, a power detector, a fuse, a charge controller and a relay K₀；

Each of the power cells G_nThe input end of the relay is connected with an alternating current power supply, and the output end of the relay is connected with a relay K_mConnecting; each of the relays K_mThe output anode is connected with the fuse, the output cathode is connected with the relay K₀Connecting; the power controller and each power unit G_nConnecting; what is needed isThe power controller is respectively connected with the power controller, the charging controller, the fuse and the relay K₀And a relay K_mConnecting; the charging controller is respectively connected with the power controller and the relay K₀And a relay K_mAnd (4) connecting.

The power controller is used for controlling each power unit G_nThe output power of (d); the power detector is used for detecting the voltage and the current of each component so as to calculate the power; the fuse is used for providing overcurrent protection for the charging pile; the charging controller is used for controlling the charging pile; DC + and DC-represent the positive and negative poles of the charging gun output, respectively.

Referring to fig. 1 to 3, a preferred embodiment of a method for diagnosing faults of a charging pile component according to the present invention includes the following steps:

step S10, the power detector obtains the power output current of each power unit and the switch control signal of each relay through the power controller, and collects the relay K₁To relay K_mAnd sending the first terminal voltage to the charge controller; the charging controller outputs current, first terminal voltage and switch control signal based on the power output current, the first terminal voltage and the switch control signal to the relay K₁To relay K_mThe working state of the system is diagnosed to generate a first diagnosis result;

step S20, the power detector collects the voltage of the second end of the fuse and the relay K₀The third terminal voltage of the FUSE, the charging current of the FUSE and the charging controller; the charging controller is used for charging the fuse and the relay K based on the second terminal voltage, the third terminal voltage and the charging current₀The working state of the system is diagnosed to generate a second diagnosis result;

step S30, the charging controller creates a current regulation rule, based on the current regulation rule, the power output current of each power unit is regulated through the power detector, the voltage drop of each component is collected through the power detector, the resistance of each component is further calculated, and a resistance curve is drawn;

step S40, the charging controller saves the first diagnosis result, the second diagnosis result and the resistance curve;

the step S10, the step S20 and the step S30 are not in sequence.

The step S10 specifically includes:

step S11, the power detector obtains the power output current I of each power unit through the power controller_nAnd a switch control signal C of each relay_m(ii) a Wherein n represents the number of the power unit and is a positive integer; m represents the number of the relay and is a positive integer; c_mThe value of (1) is 0 or 1, the value of 0 represents that the relay is disconnected, and the value of 1 represents that the relay is closed;

step S12, collecting relay K by power detector₁To relay K_mFirst terminal voltage V_mAnd outputting the power to a current I_nFirst terminal voltage V_mAnd a switch control signal C_mSending the data to a charging controller;

step S13, the charge controller outputs a current I based on each of the power outputs_nAnd a first terminal voltage V_mSeparately calculating relays K₁To relay K_mPower P of_m：P_m＝V_m*I_n；

Step S14, the charging controller prestores a first power standard range, and the charging controller determines the power P_mIf yes, go to step S15; if not, go to step S17;

step S15, the charge controller determines the switch control signal C_mIf yes, generating a first diagnosis result that the relay switch is turned off; if not, go to step S16;

step S16, the charge controller determines power P_mWhether the power is within a first power standard range or not, if so, generating a first diagnosis result with normal power; if not, generating a first diagnosis result of the abnormal power;

step S17, the charge controller determines the switch control signal C_mIf yes, generating a first diagnosis result that the relay switch acts normally; if not, generating a first diagnosis result that the relay switch is turned off.

The step S20 specifically includes:

step S21, the power detector collects the voltage V of the second end of the fuse_FUSERelay K₀Voltage V at the third terminal_K0Charging current I of fuse₀And applying the second terminal voltage V_FUSEA third terminal voltage V_K0And a charging current I₀Sending the data to a charging controller;

step S22, the charging controller bases on the second end voltage V_{FUSE and}and a charging current I₀Calculating power P of fuse_FUSE：P_FUSE＝V_FUSE*I₀；

Step S23, the charging controller prestores a second power standard range, and the charging controller determines P_FUSEWhether the power of the fuse is within a second power standard range or not is judged, and if yes, a second diagnosis result that the power of the fuse is normal is generated; if not, generating a second diagnosis result of the abnormal power of the fuse;

step S24, the charging controller bases on the third terminal voltage V_K0And a charging current I₀Calculating relay K₀Power P of_K0：P_K0＝V_K0*I₀；

Step S25, the charging controller obtains the relay K₀Switch control signal C_K0，C_K0The value of (1) is 0 or 1, the value of 0 represents that the relay is disconnected, and the value of 1 represents that the relay is closed;

step S26, the charging controller prestores a third power standard range, and the charging controller determines the power P_K0If yes, go to step S27; if not, go to step S29;

step S27, the charge controller determines the switch control signal C_K0If yes, generating a second diagnosis result that the relay switch is turned off; if not, go to step S28;

step S28, the charge controller determines power P_K0Whether the power is within the third power standard range or not, if so, generating a second diagnosis result with normal power(ii) a If not, generating a second diagnosis result of the abnormal power;

step S29, the charge controller determines the switch control signal C_K0If yes, generating a second diagnosis result that the relay switch acts normally; and if not, generating a second diagnosis result of the relay switch closing rejection.

The step S30 specifically includes:

step S31, the charging controller prestores a plurality of standard resistance curves, the charging controller creates a current regulation rule, and based on the current regulation rule, the power output current I of each power unit is regulated by the power detector_n；

Step S32, collecting the voltage drop U of each component through the power detector_aBased on said voltage drop U_aAnd a power output current I_nCalculating the resistance R of each component_a：R_a＝(U_a1-U_a2)/(I_n1-I_n2)；

The above formula is derived from:

I_n1*R_a＝U_a1；

I_n2*R_a＝U_a2；

step S33, the charging controller outputs current I based on the power_nAnd a resistance R_aAnd drawing a resistance curve (I-R curve), and monitoring the resistance curve in real time based on the standard resistance curve. During specific implementation, corresponding promotion can be carried out according to the gear of resistance deviation, for example, the deviation is within 10%, the suggestion is normal, the deviation is within 10% to 20%, the suggestion is slightly unusual, the deviation is greater than 20%, the suggestion is heavily unusual, the suggestion is to operate and maintain and overhaul.

In step S30, the current adjustment rule is specifically:

setting a current decreasing proportion, and sequentially decreasing the power output current of each power unit from the rated power based on the current decreasing proportion. For example, the power output current of each power unit is set to be 100 percent I in sequence_{Forehead (forehead)}、95％I_{Forehead (forehead)}、90％I_{Forehead (forehead)}……10％I_{Forehead (forehead)}。

In step S30, the components are fuses and relays K₀Relay K₁… … or Relay K_m。

The step S40 specifically includes:

and the charging controller stores the first diagnosis result, the second diagnosis result and the resistance curve, and displays the first diagnosis result, the second diagnosis result and the resistance curve through a display screen.

In summary, the invention has the advantages that:

the working state of each relay can be quickly judged by collecting the voltage and current of each relay to calculate power and combining the switch control signal and the power standard range of each relay; the working state of the fuse can be quickly judged by collecting the voltage and the current of the fuse to calculate the power and combining the standard range of the power of the fuse; the power output current of each power unit is sequentially decreased from the rated power based on the current decreasing proportion, the voltage drop of each component is collected, the resistance of each component is calculated to draw a resistance curve, the resistance of each component under different currents is monitored in real time, when a charging pile breaks down, the broken component can be immediately judged, a series of detection work on the charging pile in the prior art is not needed, and the component failure diagnosis efficiency is greatly improved.

Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.

Claims (7)

1. A fault diagnosis method for components of a charging pile is characterized by comprising the following steps: the method comprises the following steps:

step S10, the power detector obtains the power output current of each power unit through the power controllerAnd the switch control signals of the relays and the acquisition relay K₁To relay K_mAnd sending the first terminal voltage to the charge controller; the charging controller outputs current, first terminal voltage and switch control signal based on the power output current, the first terminal voltage and the switch control signal to the relay K₁To relay K_mThe working state of the system is diagnosed to generate a first diagnosis result;

step S20, the power detector collects the voltage of the second end of the fuse and the relay K₀The voltage of the third end of the fuse and the charging current of the fuse are sent to a charging controller; the charging controller is used for charging the fuse and the relay K based on the second terminal voltage, the third terminal voltage and the charging current₀The working state of the system is diagnosed to generate a second diagnosis result;

step S30, the charging controller creates a current regulation rule, based on the current regulation rule, the power output current of each power unit is regulated through the power detector, the voltage drop of each component is collected through the power detector, the resistance of each component is further calculated, and a resistance curve is drawn;

step S40, the charging controller saves the first diagnosis result, the second diagnosis result and the resistance curve;

the step S10, the step S20 and the step S30 are not in sequence.

2. The method for diagnosing the faults of the charging pile components as claimed in claim 1, wherein the method comprises the following steps: the step S10 specifically includes:

step S11, the power detector obtains the power output current I of each power unit through the power controller_nAnd a switch control signal C of each relay_m(ii) a Wherein n represents the number of the power unit and is a positive integer; m represents the number of the relay and is a positive integer; c_mThe value of (1) is 0 or 1, the value of 0 represents that the relay is disconnected, and the value of 1 represents that the relay is closed;

step S12, collecting relay K by power detector₁To relay K_mFirst terminal voltage V_mAnd outputting the power to a current I_nA first endVoltage V_mAnd a switch control signal C_mSending the data to a charging controller;

step S13, the charge controller outputs a current I based on each of the power outputs_nAnd a first terminal voltage V_mSeparately calculating relays K₁To relay K_mPower P of_m：P_m＝V_m*I_n；

Step S14, the charging controller prestores a first power standard range, and the charging controller determines the power P_mIf yes, go to step S15; if not, go to step S17;

step S15, the charge controller determines the switch control signal C_mIf yes, generating a first diagnosis result that the relay switch is turned off; if not, go to step S16;

step S16, the charge controller determines power P_mWhether the power is within a first power standard range or not, if so, generating a first diagnosis result with normal power; if not, generating a first diagnosis result of the abnormal power;

step S17, the charge controller determines the switch control signal C_mIf yes, generating a first diagnosis result that the relay switch acts normally; if not, generating a first diagnosis result that the relay switch is turned off.

3. The method for diagnosing the faults of the charging pile components as claimed in claim 1, wherein the method comprises the following steps: the step S20 specifically includes:

step S21, the power detector collects the voltage V of the second end of the fuse_FUSERelay K₀Voltage V at the third terminal_K0Charging current I of fuse₀And applying the second terminal voltage V_FUSEA third terminal voltage V_K0And a charging current I₀Sending the data to a charging controller;

step S22, the charging controller bases on the second end voltage V_{FUSE and}and a charging current I₀Calculating power P of fuse_FUSE：P_FUSE＝V_FUSE*I₀；

Step S23, the charging controller prestores a second power standard range, and the charging controller determines P_FUSEWhether the power of the fuse is within a second power standard range or not is judged, and if yes, a second diagnosis result that the power of the fuse is normal is generated; if not, generating a second diagnosis result of the abnormal power of the fuse;

step S24, the charging controller bases on the third terminal voltage V_K0And a charging current I₀Calculating relay K₀Power P of_K0：P_K0＝V_K0*I₀；

Step S25, the charging controller obtains the relay K₀Switch control signal C_K0，C_K0The value of (1) is 0 or 1, the value of 0 represents that the relay is disconnected, and the value of 1 represents that the relay is closed;

step S26, the charging controller prestores a third power standard range, and the charging controller determines the power P_K0If yes, go to step S27; if not, go to step S29;

step S27, the charge controller determines the switch control signal C_K0If yes, generating a second diagnosis result that the relay switch is turned off; if not, go to step S28;

step S28, the charge controller determines power P_K0Whether the power is within a third power standard range or not, if so, generating a second diagnosis result with normal power; if not, generating a second diagnosis result of the abnormal power;

step S29, the charge controller determines the switch control signal C_K0If yes, generating a second diagnosis result that the relay switch acts normally; and if not, generating a second diagnosis result of the relay switch closing rejection.

4. The method for diagnosing the faults of the charging pile components as claimed in claim 1, wherein the method comprises the following steps: the step S30 specifically includes:

step S31, the charging controller prestores a plurality of standard resistance curves, and the charging controller creates aCurrent regulation rules and based on the current regulation rules, the power output current I of each power unit is regulated by a power detector_n；

Step S32, collecting the voltage drop U of each component through the power detector_aBased on said voltage drop U_aAnd a power output current I_nCalculating the resistance R of each component_a：R_a＝(U_a1-U_a2)/(I_n1-I_n2)；

Step S33, the charging controller outputs current I based on the power_nAnd a resistance R_aAnd drawing a resistance curve, and monitoring the resistance curve in real time based on the standard resistance curve.

5. The method for diagnosing the faults of the charging pile components as claimed in claim 1, wherein the method comprises the following steps: in step S30, the current adjustment rule is specifically:

setting a current decreasing proportion, and sequentially decreasing the power output current of each power unit from the rated power based on the current decreasing proportion.

6. The method for diagnosing the faults of the charging pile components as claimed in claim 1, wherein the method comprises the following steps: in step S30, the components are fuses and relays K₀Relay K₁… … or Relay K_m。

7. The method for diagnosing the faults of the charging pile components as claimed in claim 1, wherein the method comprises the following steps: the step S40 specifically includes:

and the charging controller stores the first diagnosis result, the second diagnosis result and the resistance curve, and displays the first diagnosis result, the second diagnosis result and the resistance curve through a display screen.

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