Method, device and equipment for diagnosing over-range of dmtl pump current and storage medium

Abstract

The application discloses a kind of DMTL pump current over-range diagnostic method, whether the difference between the maximum value and the minimum value of pump current in the stage of measuring pump reference current is greater than or equal to the first preset threshold value is judged;If no, then enter the next stage;If yes, then after the first delay time, whether the difference between the maximum value and the minimum value of pump current in the stage of measuring pump reference current is greater than or equal to the second preset threshold value is judged;If yes, then report DMTL pump failure;If no, then exit monitoring.The device for executing the above-mentioned diagnostic method, electronic equipment and storage medium are also provided.The beneficial effects of the present application are to improve the effectiveness and accuracy of DMTL pump diagnosis, and to prolong the service life of the battery used for monitoring.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, and in particular to a diagnostic method, apparatus, device, and storage medium for DMTL pump current out of range. Background Technology

[0002] like Figure 1 As shown, the automobile includes an evaporation system that temporarily stores evaporative pollutants lost from the automobile's fuel system, preventing them from escaping into the atmosphere, and then delivers the evaporative pollutants to the engine for combustion when appropriate.

[0003] The China VI emission standard requires monitoring the integrity of the entire evaporation system, excluding the piping and connections between the carbon canister valve and the intake manifold, to prevent fuel vapor from leaking into the atmosphere—a process known as leak monitoring. The regulation stipulates that if one or more leak points exist in the entire evaporation system, and the leakage from these points is greater than or equal to the leakage from a small orifice with a diameter of 1 mm (described later as "1 mm monitoring" and "1 mm leak"), an evaporation system leak fault should be reported. DMTL leak diagnosis is one such method, performed after the vehicle is powered off, and diagnosing the leak by observing the correlation between the air pump current and the fuel tank pressure. The relevant device setup is as follows... Figure 1 As shown.

[0004] like Figure 2 As shown, the specific 1mm monitoring is divided into three stages: measuring the pump reference current, measuring the pump idle current, and diagnosis.

[0005] Once the diagnostic conditions are met, the DMTL valve will close, and the DMTL pump will begin operating, pumping air into the 0.5mm reference orifice. After a period of time, the pump's power and the resistance of the air pumped into the reference orifice will balance, and the pump current will stabilize. This stable pump current is the pump reference current. This period is the phase for measuring the pump reference current.

[0006] After the reference pump current measurement is completed, the solenoid valve in the DMTL assembly engages, ceasing the pumping of air into the reference orifice and instead pumping air into the fuel tank system. Since the initial pressure of the fuel tank system is atmospheric pressure, the pump idles for a short period after the solenoid valve engages, and the pump current drops rapidly. As more air is pumped into the fuel tank, the tank pressure gradually increases, meaning the pumping resistance increases, and the pump current also gradually increases. The minimum pump current after the solenoid valve engages is called the pump idle current. This time period is the pump idle current measurement phase.

[0007] During the process of the DMTL pump pumping air into the oil tank, the system calculates the relative pressure of the oil tank and determines whether there is a 1mm leak based on the pressure. If the relative pressure of the oil tank is higher than the preset diagnostic threshold, it is determined that there is no 1mm leak, and the diagnosis exits. If the relative pressure of the oil tank remains lower than the preset diagnostic threshold within the calibration time, a leak fault is reported. This stage is the diagnostic stage.

[0008] In reality, problems with the DMTL pump itself can significantly interfere with leak monitoring in the evaporation system. These issues include, but are not limited to, the presence of oil and solid impurities within the DMTL pump motor, leading to changes in mechanical friction and consequently fluctuations in the DMTL pump current. In DMTL leak diagnosis methods, there is a corresponding relationship between the DMTL pump current and the tank pressure; abnormal fluctuations in the DMTL pump current can cause errors in leak diagnosis, resulting in misjudgments.

[0009] Therefore, it is necessary to diagnose the health status of the DMTL pump during leak monitoring to eliminate interference. Summary of the Invention

[0010] To address the aforementioned problems, one objective of this invention is to provide a diagnostic method for DMTL pump current out-of-range conditions, comprising:

[0011] Determine whether the difference between the maximum and minimum values ​​of the pump current during the pump reference current measurement phase is greater than or equal to a first preset threshold.

[0012] If not, proceed to the next stage;

[0013] If so, after the first delay time, determine whether the difference between the maximum and minimum values ​​of the pump current during the pump reference current measurement stage is greater than or equal to the second preset threshold.

[0014] If so, report a DMTL pump malfunction;

[0015] If not, then exit monitoring.

[0016] In some preferred embodiments, it further includes:

[0017] Determine whether the pump current drop during the diagnostic phase is greater than or equal to the third preset threshold.

[0018] If not, report that the DMTL pump is not faulty;

[0019] If so, after the second delay time, determine whether the pump current drop during the diagnostic phase is greater than or equal to the fourth preset threshold.

[0020] If not, then exit monitoring;

[0021] If so, determine whether the duration of the pump current drop being greater than or equal to the fourth preset threshold is greater than or equal to the time threshold.

[0022] If so, report a DMTL pump malfunction;

[0023] If not, then exit monitoring.

[0024] In some preferred embodiments, it further includes:

[0025] Determine whether the pressure drop in the fuel tank during the diagnostic phase is greater than or equal to the fifth preset threshold.

[0026] If so, and the pump current drop amplitude during the diagnostic phase is greater than or equal to the fourth preset threshold, and the duration of the current drop amplitude being greater than or equal to the fourth preset threshold is greater than the time threshold, then monitoring will be terminated.

[0027] If not, and the pump current drop amplitude during the diagnostic phase is greater than or equal to the fourth preset threshold, and the duration of the current drop amplitude being greater than or equal to the fourth preset threshold is greater than the time threshold, then a DMTL pump fault is reported.

[0028] In some preferred embodiments, it further includes:

[0029] Before measuring the pump reference current, determine whether the operating and physical conditions of the evaporation system and the DMTL pump meet the diagnostic requirements.

[0030] If so, proceed to the pump reference current measurement stage.

[0031] In some preferred embodiments, the PCV canister valve of the evaporation system is closed before the pump reference current stage.

[0032] In some preferred embodiments, it further includes:

[0033] During the pump reference current measurement phase, the pump current is calculated. After a third delay time, it is determined whether the difference between the maximum and minimum values ​​of the pump current during the pump reference current measurement phase is greater than or equal to the first preset threshold.

[0034] A second objective of this invention is to provide a diagnostic device for a DMTL pump in an evaporation system, comprising:

[0035] A current value acquisition device is used to acquire the pump current signal of the DMTL pump;

[0036] The diagnostic module performs calculations and judgments based on the real-time pump current signal and outputs the judgment results.

[0037] In some preferred embodiments, it further includes:

[0038] The pressure sensor inside the fuel tank is used to acquire the air pressure signal inside the fuel tank in the evaporation system in real time and send the air pressure signal to the diagnostic module.

[0039] A third objective of this invention is to provide an electronic device, the electronic device comprising:

[0040] At least one processor; and,

[0041] A memory communicatively connected to the at least one processor; wherein,

[0042] The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the aforementioned diagnostic method.

[0043] A fourth objective of the present invention is to provide a non-transitory computer-readable storage medium that stores computer instructions for causing the computer to perform the aforementioned diagnostic method.

[0044] Beneficial Effects: This invention sets two threshold values ​​for comparing pump current values ​​in both the pump reference current measurement stage and the diagnostic stage of evaporator system leak monitoring. A DMTL pump fault is only reported when both comparisons are satisfied. Compared to the conventional approach of setting only one current comparison, this invention effectively avoids missed and false alarms, improving the effectiveness and stability of leak monitoring operations. Furthermore, a short-time mode can be used in the pump reference current measurement stage, reducing battery usage and wear, thereby extending battery life. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0046] Figure 1 A schematic diagram of the DMTL pump connected to the evaporation system in a vehicle used for leak monitoring.

[0047] Figure 2 A schematic diagram illustrating the monitoring process using air pressure and pump current in vehicle evaporation system leak monitoring.

[0048] Figure 3 This is a schematic diagram of the diagnostic method in this invention.

[0049] Figure 4 This is a schematic diagram of another step in the diagnostic method of the present invention.

[0050] Figure 5 This is a schematic diagram of another step in the diagnostic method of this invention.

[0051] Figure 6 This is a schematic diagram of the diagnostic device structure in this invention.

[0052] Figure 7 This is a schematic diagram of the diagnostic module structure in this invention.

[0053] Figure 8 This is a schematic diagram of the electronic device structure in this invention.

[0054] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0056] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0057] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0058] Figure 1 This is a schematic diagram of the connection between the automotive evaporation system and the DMTL pump. The diagram includes a throttle valve 10, a PCV carbon canister valve 20, a carbon canister 30, a fuel tank 40, and a DMTL pump 90. The DMTL pump 90 is equipped with a solenoid valve 50, a 0.5mm reference hole 60, and a motor 70. The DMTL pump 90 is connected to an air filter 80.

[0059] Specifically, when monitoring the evaporation system at 1mm, the process is divided into three stages: measuring the pump reference current, measuring the pump idle current, and diagnosis.

[0060] Before measuring the pump reference current, the physical and operational conditions of the evaporation system are tested to ensure they meet the requirements for subsequent monitoring. After monitoring, the evaporation system must be kept closed; generally, this is achieved by closing the PCV carbon canister valve 20. Simultaneously, the piping system consisting of the carbon canister 30 and fuel tank 40 is connected to the atmosphere via the DMTL pump 90, and the internal pressure is atmospheric pressure.

[0061] The measurement of the pump reference current begins. The solenoid valve 50 inside the DMTL pump 90 is closed, the motor 70 is started, and the entire DMTL pump 90 begins operation. The motor 70 pumps air into the 0.5mm reference orifice 60. After continuous pumping for a period of time, the pump's power and the resistance generated by the 0.5mm reference orifice 60 against the air reach equilibrium, at which point the pump current stabilizes. This stable pump current is the pump reference current I. The measurement of the pump reference current is considered complete once the pump reference current I is generated.

[0062] After the reference pump current measurement is completed, solenoid valve 50 opens, ceasing to pump air into the 0.5mm reference orifice 60, and instead pumping air into the closed piping system consisting of fuel tank 40 and carbon canister 30. Since the initial pressure within this piping system is atmospheric pressure, the pump idles for a short period after solenoid valve 50 opens, and the pump current drops rapidly. As more air is pumped into the fuel tank by motor 70, the fuel tank pressure gradually increases, meaning the pumping resistance of motor 70 increases, and the pump current also gradually increases. The minimum pump current after solenoid valve 50 opens during this process is called the pump idle current. This stage is the pump idle current measurement stage.

[0063] During the process of DMTL pump 90 pumping air into fuel tank 40, the system calculates the relative pressure of fuel tank 40 and determines whether there is a 1mm leak based on the pressure. If the relative pressure of fuel tank 40 is higher than the diagnostic preset threshold, it is determined that there is no 1mm leak, and the diagnosis exits. If the relative pressure of fuel tank 40 remains lower than the diagnostic preset threshold within the calibrated time, a leak fault is reported. This stage is the diagnostic stage.

[0064] The above describes the current changes in leakage monitoring. Figure 2 As shown in the figure, A represents the pump reference current measurement stage, B represents the pump idle current measurement stage, and C represents the diagnostic stage.

[0065] During the above evaporation system leak monitoring process, the abnormality of the DMTL pump is also diagnosed to determine whether it has an abnormal impact on the leak monitoring results.

[0066] like Figure 3As shown, a diagnostic method for DMTL pump current out-of-range includes the following steps:

[0067] S10. Determine whether the difference between the maximum and minimum values ​​of the pump current ΔI1 during the pump reference current measurement stage is greater than or equal to the first preset threshold C1; if not, proceed to the next stage; if yes, execute S20.

[0068] Hereinafter, the difference between the maximum and minimum current values ​​is directly denoted as ΔI1, and the first preset threshold is directly denoted as C1.

[0069] This step occurs during the measurement of the pump reference current. Due to inherent problems with the DMTL pump itself, such as the presence of droplets within the motor 70 affecting its operation, changes in the pump current are also caused. Therefore, to make a judgment, a comparison is made between the changes in the pump current, ΔI1, and C1. If ΔI1 is less than C1, it is interpreted as the pump operating smoothly; if ΔI1 is greater than or equal to C1, it is interpreted as interference in the pump's operation. This step is the initial comparison and judgment.

[0070] S20. After the first delay time T1, determine whether the difference between the maximum and minimum values ​​of the pump current ΔI1 during the pump reference current measurement stage is greater than or equal to the second preset threshold C2; if yes, report a DMTL pump fault; if no, exit monitoring.

[0071] Hereinafter, the second preset threshold will also be denoted as C2.

[0072] This step further compares the values ​​from S10, specifically comparing ΔI1 and C2, where C2 is greater than C1. If ΔI1 is greater than or equal to C2, it indicates significant interference and excessive fluctuations in the pump current, leading to a DMTL pump fault report. If ΔI1 is less than C2, it indicates an intermittent issue, and monitoring can be exited; the leak monitoring can be restarted fully later. This step involves a secondary comparison and judgment.

[0073] As can be seen from the combination of S10 and S20 above, during the pump reference current measurement stage, ΔI1 is compared with C1 and C2 sequentially. A DMTL pump fault is only reported when ΔI1 is simultaneously larger than both C1 and C2. Compared to setting only one threshold for current comparison, this invention avoids occasional interference in the DMTL pump, such as water droplets between the stator and rotor of the motor. The mechanical friction caused by these droplets can affect the pump current, but they will naturally disappear as the water evaporates and cannot be considered a true DMTL pump fault. Furthermore, only persistent impurities such as engine oil and particulate matter that cannot be naturally eliminated can be considered DMTL pump faults. Therefore, by setting two comparison thresholds C1 and C2, this invention avoids false alarms caused by occasional interference and also prevents missed faults, thus enhancing the overall stability and effectiveness of the leak monitoring process. Setting only one comparison threshold can lead to false alarms if the threshold is too small, or missed faults if the threshold is too large.

[0074] The above steps S10-S20 complete the determination of whether a DMTL pump is faulty.

[0075] like Figure 4 As shown, in some preferred embodiments, the step further includes:

[0076] S01. Determine whether the pump current drop amplitude △I2 during the diagnostic phase is greater than or equal to the third preset threshold C3; if not, report that the DMTL pump is fault-free; if yes, proceed to S02.

[0077] In the following diagnostic phase, the pump current drop is denoted as ΔI2, and the third preset threshold is denoted as C3.

[0078] This step occurs during the diagnostic phase, such as... Figure 2 As shown, under normal and good conditions, the pump current value should steadily increase. A drop in the current value indicates an abnormal situation. Since the pump current value and the air pressure in the fuel tank system are synchronously related, a drop in the pump current value could be due to a malfunction in the DMTL pump itself, or it could be due to a drop in air pressure in the fuel tank system.

[0079] When ΔI2 is less than C3, there is neither a decrease in fuel tank line pressure nor an excessive drop in pump current, therefore the overall system is considered fault-free. When ΔI2 is greater than or equal to C3, the comparison continues. This step is the initial comparison.

[0080] S02. After the second delay time T2, determine whether the pump current drop amplitude △I2 during the diagnostic phase is greater than or equal to the fourth preset threshold C4; if not, exit monitoring; if yes, execute S03.

[0081] Hereinafter, the fourth preset threshold is denoted as C4.

[0082] In this step, ΔI2 is further compared. If ΔI2 is less than C4, it indicates that the pump current drop is intermittent, and monitoring is terminated immediately to facilitate the subsequent restart of the overall leakage monitoring. If ΔI2 is greater than or equal to C4, the duration of the pump current drop also needs to be compared to further determine the cause of the pump current drop based on the time.

[0083] S03. Determine whether the duration T during which the pump current drop amplitude △I2 is greater than or equal to the fourth preset threshold is greater than or equal to the time threshold T0; if yes, report a DMTL pump fault; if no, exit monitoring.

[0084] The duration during which the pump current drop amplitude ΔI2 is greater than or equal to the fourth preset threshold is directly denoted as T, and the time threshold is directly denoted as T0.

[0085] In this step, T and T0 are compared. Only when T is greater than T0 is a DMTL pump fault ultimately determined. If the time comparison does not meet the requirements, monitoring is terminated and no fault is identified. This avoids interference from factors such as occasional short-term abnormal drops in fuel tank line pressure.

[0086] The numerical comparison and judgment process of S01-S03 above is the same as that of S10-S20. That is, the DMTL pump fault is reported only after confirmation by two comparisons. If the comparison conditions are not met, the monitoring is simply stopped. Compared with a single numerical comparison, this can avoid false alarms and missed alarms for DMTL pump faults.

[0087] The above steps S01-S03 again determine whether the DMTL pump is faulty.

[0088] like Figure 5 As shown, in some preferred embodiments, the step further includes:

[0089] S1. Determine whether the pressure drop amplitude ΔP in the fuel tank during the diagnostic phase is greater than or equal to the fifth preset threshold P; if yes, and the pump current drop amplitude ΔI2 during the diagnostic phase is greater than or equal to the fourth preset threshold C4, and the duration T of the current drop amplitude ΔI2 being greater than or equal to the fourth preset threshold C4 is greater than the time threshold T0, then exit monitoring; if no, and the pump current drop amplitude ΔI2 during the diagnostic phase is greater than or equal to the fourth preset threshold C4, and the duration T of the current drop amplitude ΔI2 being greater than or equal to the fourth preset threshold C4 is greater than the time threshold T0, then report a DMTL pump failure.

[0090] This step occurs during the diagnostic phase. It involves acquiring the pressure drop value ΔP in the fuel tank and comparing it to the fifth preset threshold P. If the pressure drop is too large (ΔP is greater than or equal to P), it indicates that the pump current drop exceeding C4 is due to reduced fuel tank pressure, and cannot be diagnosed as a DMTL pump malfunction. If ΔP is less than P, it indicates a very small pressure drop, or even no change in pressure, in which case a DMTL pump malfunction is diagnosed and reported.

[0091] This step involves monitoring changes in air pressure to interactively verify the drop in pump current during the diagnostic phase, thus eliminating the possibility of misjudgment caused by a drop in air pressure leading to a drop in pump current.

[0092] This invention, through the above-described scheme, sets two threshold values ​​for comparing pump current values ​​during the pump reference current measurement and diagnostic phases of the evaporation system. A DMTL pump fault is only reported when both comparisons are satisfied. Compared to the conventional approach of setting only one current comparison, this invention effectively avoids missed and false alarms, improving the effectiveness and stability of leak monitoring. Furthermore, existing methods differentiate leak monitoring based on the pump reference current measurement phase duration (130 seconds or 10 seconds). Due to the poor effectiveness and low stability of single comparisons, the 130-second method is often used, but this reduces the battery life used for leak monitoring. Therefore, based on the superior effectiveness and stability of this invention, a 10-second leak monitoring operation can be directly adopted, thereby improving battery life.

[0093] In some preferred embodiments, the method further includes: determining whether the operating conditions and physical conditions of the evaporation system and the DMTL pump meet the diagnostic requirements before the pump reference current measurement stage; if so, proceeding to the pump reference current measurement stage.

[0094] Leakage monitoring can only be carried out if the hardware environment meets the conditions for leakage monitoring. Therefore, it is necessary to obtain and judge the conditions of the evaporation system and DMTL pump before officially starting monitoring.

[0095] In some preferred embodiments, the PCV canister valve of the evaporation system is closed before the pump reference current stage.

[0096] Closing the PCV canister valve in the evaporation system provides a closed environment for the piping system formed by the fuel tank and the PCV canister valve, facilitating subsequent leak monitoring.

[0097] In some preferred embodiments, the method further includes: during the pump reference current measurement phase, starting to calculate the pump current, and after a third delay time T3, determining whether the difference between the maximum and minimum values ​​of the pump current during the pump reference current measurement phase, ΔI1, is greater than or equal to a first preset threshold C1.

[0098] Because the air pressure environment is unstable in the early stage of measuring the pump reference current, resulting in unstable pump current, the corresponding pump current value is officially acquired and compared only after a third delay time T3. For example, in a 10-second operation, if the third delay time T3 is set to 6 seconds, the maximum and minimum values ​​of the pump current are acquired after 6 seconds.

[0099] like Figure 6 As shown, a diagnostic device 1 for performing the above-described diagnostic method includes a current value acquisition device 11 and a diagnostic module 12. The current value acquisition device 11 is used to acquire the pump current signal of the DMTL pump, and the diagnostic module 12 performs calculations and judgments based on the real-time acquired pump current signal and outputs the judgment result.

[0100] like Figure 7 As shown, the diagnostic module 12 includes a calculation module 121 and a storage module 122. The storage module 122 stores the maximum value, minimum value and current drop value of the real-time current at each stage, as well as various preset thresholds. The calculation module 121 calculates the current drop value, calculates the obtained maximum and minimum values, compares and judges them with the corresponding thresholds, and then judges and outputs the judgment result.

[0101] like Figure 7 As shown, the diagnostic module 12 further includes a timer 123. The timer 123 is used to acquire the duration of the pump current drop and sends the duration to the calculation module 121 and the storage module 122 for calculation and judgment.

[0102] like Figure 6 As shown, in some preferred embodiments, the diagnostic device 1 includes a fuel tank pressure sensor 13. The fuel tank pressure sensor 13 is used to acquire the gas pressure signal in the fuel tank of the evaporation system in real time and send the gas pressure signal to the diagnostic module 12.

[0103] The pressure sensor 13 inside the fuel tank acquires the air pressure value inside the fuel tank in real time, and calculates the pressure drop amplitude ΔP through the calculation module 121 in the diagnostic module 12. The fifth preset threshold P and the calculated air pressure drop amplitude ΔP are stored in the storage module 122, and the comparison and judgment between the two are completed by the calculation module 121.

[0104] An electronic device, the electronic device comprising:

[0105] At least one processor; and,

[0106] A memory communicatively connected to the at least one processor; wherein,

[0107] The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the aforementioned diagnostic method.

[0108] A non-transitory computer-readable storage medium stores computer instructions for causing the computer to perform the aforementioned diagnostic method.

[0109] Figure 8 The above is a schematic diagram of the structure of the electronic device. The electronic device 2 in the embodiments of this application may include, but is not limited to, mobile electronic devices such as laptops, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), etc., as well as fixed electronic devices such as digital TVs, desktop computers, etc. Figure 8 The electronic device 2 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0110] Electronic device 2 may include a processing unit (e.g., a central processing unit, a graphics processing unit, etc.) 21, which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 22 or a program loaded from storage device 28 into random access memory (RAM) 23. The RAM 23 also stores various programs and data required for the operation of electronic device 2. The processing unit 21, ROM 22, and RAM 23 are interconnected via bus 22. Input / output (I / O) interface 25 is also connected to bus 22.

[0111] Typically, the following devices can be connected to I / O interface 25: input devices 26 including, for example, touchscreens, touchpads, keyboards, mice, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices 23 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 28 including, for example, magnetic tapes, hard disks, etc.; and communication devices 29. Communication device 29 allows electronic device 2 to communicate wirelessly or wiredly with other devices to exchange data. Although electronic device 2 with various devices is shown in the figure, it should be understood that it is not required to implement or possess all the devices shown. More or fewer devices may be implemented or possessed alternatively.

[0112] The aforementioned computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this disclosure, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in connection with an instruction execution system, apparatus, or device. In this disclosure, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals can take various forms, including, but not limited to, electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium can be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wires, optical fibers, RF (radio frequency), etc., or any suitable combination thereof.

[0113] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A diagnostic method for DMTL pump current out-of-range, characterized in that, include: Determine whether the difference between the maximum and minimum values ​​of the pump current during the pump reference current measurement phase is greater than or equal to a first preset threshold. If not, proceed to the next stage; If so, after the first delay time, determine whether the difference between the maximum and minimum values ​​of the pump current during the pump reference current measurement stage is greater than or equal to the second preset threshold. The second preset threshold is greater than the first preset threshold; If so, report a DMTL pump malfunction; If not, then exit monitoring; Also includes: Determine whether the pump current drop during the diagnostic phase is greater than or equal to the third preset threshold. If not, report that the DMTL pump is not faulty; If so, after the second delay time, determine whether the pump current drop during the diagnostic phase is greater than or equal to the fourth preset threshold. If not, then exit monitoring; If so, determine whether the duration of the pump current drop being greater than or equal to the fourth preset threshold is greater than or equal to the time threshold. If so, report a DMTL pump malfunction; If not, then exit monitoring; Also includes: Determine whether the pressure drop in the fuel tank during the diagnostic phase is greater than or equal to the fifth preset threshold. If so, and the pump current drop amplitude during the diagnostic phase is greater than or equal to the fourth preset threshold, and the duration of the current drop amplitude being greater than or equal to the fourth preset threshold is greater than the time threshold, then monitoring will be terminated. If not, and the pump current drop amplitude during the diagnostic phase is greater than or equal to the fourth preset threshold, and the duration of the current drop amplitude being greater than or equal to the fourth preset threshold is greater than the time threshold, then a DMTL pump fault is reported.

2. The diagnostic method for DMTL pump current out-of-range as described in claim 1, characterized in that, Also includes: Before measuring the pump reference current, determine whether the operating and physical conditions of the evaporation system and the DMTL pump meet the diagnostic requirements. If so, proceed to the pump reference current measurement stage.

3. The diagnostic method for DMTL pump current out-of-range as described in claim 1, characterized in that, Close the PCV carbon canister valve of the evaporation system before the pump reference current stage.

4. The diagnostic method for DMTL pump current out-of-range as described in claim 1, characterized in that, Also includes: During the pump reference current measurement phase, the pump current is calculated. After a third delay time, it is determined whether the difference between the maximum and minimum values ​​of the pump current during the pump reference current measurement phase is greater than or equal to the first preset threshold.

5. A diagnostic device for implementing the diagnostic method for DMTL pump current out-of-range as described in any one of claims 1 to 4, characterized in that, include: A current value acquisition device is used to acquire the pump current signal of the DMTL pump; The diagnostic module performs calculations and judgments based on the real-time pump current signal and outputs the judgment results.

6. The diagnostic device as described in claim 5, characterized in that, Also includes: The pressure sensor inside the fuel tank is used to acquire the air pressure signal inside the fuel tank in the evaporation system in real time and send the air pressure signal to the diagnostic module.

7. An electronic device, the electronic device comprising: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the diagnostic method according to any one of claims 1-4.

8. A non-transitory computer-readable storage medium storing computer instructions for causing the computer to perform the diagnostic method according to any one of claims 1-4.

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