CN109386416B - Dry run diagnostic system and method for fuel pump - Google Patents
Dry run diagnostic system and method for fuel pump Download PDFInfo
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- CN109386416B CN109386416B CN201710652047.XA CN201710652047A CN109386416B CN 109386416 B CN109386416 B CN 109386416B CN 201710652047 A CN201710652047 A CN 201710652047A CN 109386416 B CN109386416 B CN 109386416B
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- fuel pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/04—Feeding by means of driven pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
Abstract
The invention relates to a dry run diagnostic system for a fuel pump, comprising: the real-time rotating speed detection module is used for detecting the real-time rotating speed of the fuel pump; an estimated rotating speed obtaining module, which is used for obtaining the estimated rotating speed of the fuel pump; the subtractor is used for calculating the rotation speed difference between the real-time rotation speed and the estimated rotation speed; a Schmitt trigger that generates a corresponding signal reflecting a current operating state of the fuel pump based on the difference in rotational speed from the subtractor. The invention also relates to a dry running diagnostic method for a fuel pump, comprising the steps of: detecting the real-time rotating speed of the fuel pump; acquiring an estimated rotating speed of a fuel pump; calculating a rotational speed difference between the real-time rotational speed and the estimated rotational speed of the fuel pump; the calculated difference in rotational speed is compared with a predetermined threshold value and a corresponding signal reflecting the current operating state of the fuel pump is generated based on the comparison.
Description
Technical Field
The present invention relates to the field of fuel pumps, and more particularly, to a dry run diagnostic system and method for a fuel pump, particularly a brushed direct flow fuel pump.
Background
The fuel pump may be in a dry running condition due to a low fuel level condition in the vehicle's fuel tank. If the operation of the fuel pump is not stopped in time, serious faults such as overheating and burning out of the fuel pump core, ignition of fuel, sudden flameout of a vehicle due to fuel cut and the like can occur.
When the oil pump runs dry, the current is smaller than that when the oil pump runs normally, and the current corresponds to the supply voltage of the oil pump. Therefore, in the conventional oil pump dry running diagnostic technology, a certain voltage-current dry running threshold curve is usually set, the oil pump controller detects the voltage and the current of the oil pump on line when the system is running, and the oil pump controller compares the voltage and the current with the preset threshold curve after signal processing, so as to judge whether the oil pump has a dry running fault.
However, such conventional methods have disadvantages in that: firstly, the oil pump mean value current tolerance is large, the batch products have large discreteness, and a preset voltage-mean value current curve is higher, so that the upper limit of a threshold current curve is closer to the lower limit of a normal current, and the width of a current buffer interval is compressed (see fig. 3); secondly, the oil pump current pulse amplitude is large and can reach +/-2 amperes, the dry running current dispersion can be further increased, and the buffer area is reduced.
Therefore, the normal operation current of the batch fuel pumps has a certain probability of falling below a voltage-current threshold curve, namely a normal region and a fault region may overlap slightly (a current buffer region is negative), so that misjudgment of dry operation diagnosis of the fuel pumps occurs, and therefore the algorithm is not high in reliability and is rarely used.
Therefore, the brushed pump controller rarely carries on the dry run diagnostic function. In fact, all brushed pump controllers currently on the market do not have a direct speed detection function, so that a speed-based brushed fuel pump dry running diagnostic function cannot be realized.
However, dry running protection for fuel pumps is an important function and involves safety issues. Dry running fuel pumps generate a lot of heat, and the fuel that does not flow cools down will accumulate heat until it burns out. The large amount of heat generated by dry running may ignite its components with low probability, further igniting the fuel in the fuel tank, and in severe cases causing the vehicle body to burn; the fuel pump burned out by dry running cannot continuously supply fuel to the engine, so that the vehicle suddenly stops working, and serious traffic accidents are caused in serious conditions.
Disclosure of Invention
The invention aims to fill the market blank aiming at the dry running diagnosis function of the brushed fuel pump, and provides a dry running diagnosis system and a dry running diagnosis method for the fuel pump.
According to one embodiment of the present invention, a dry run diagnostic system for a fuel pump may include: the real-time rotating speed detection module is used for detecting the real-time rotating speed of the fuel pump; an estimated rotating speed obtaining module, which is used for obtaining the estimated rotating speed of the fuel pump; the subtractor is used for calculating the rotation speed difference between the real-time rotation speed and the estimated rotation speed; a Schmitt trigger that generates a corresponding signal reflecting a current operating state of the fuel pump based on the difference in rotational speed from the subtractor. The invention also relates to a dry running diagnostic method for the fuel pump.
Preferably, the estimated rotation speed acquisition module may include a fuel pump characteristic database in which a look-up table unit related to fuel pump characteristics obtained by experimental data is stored in advance, and when voltage and current of the fuel pump are taken as inputs into the look-up table unit, the estimated rotation speed of the fuel pump can be retrieved.
Preferably, a positive threshold and a negative threshold are set for the schmitt trigger, respectively, the positive threshold being greater than the negative threshold.
Preferably, when the difference in the rotation speed from the subtractor is less than or equal to the negative threshold, the schmitt trigger may output a low level to indicate that the fuel pump is in a normal operation state.
Preferably, when the difference in the rotational speed from the subtractor is greater than or equal to the forward threshold, the schmitt trigger may output a high level to indicate that the fuel pump is in a dry running state.
Preferably, the schmitt trigger may maintain its current level state when the difference in rotational speed from the subtractor is between the negative threshold and the positive threshold.
Preferably, the system may further comprise an alarm, which may issue an alarm, for example, in case the schmitt trigger outputs a high level. Alternatively, the alarm may output an alarm in the case where the schmitt trigger outputs a low level.
According to another embodiment of the present invention, a dry running diagnostic method for a fuel pump may include the steps of: detecting the real-time rotating speed of the fuel pump; acquiring an estimated rotating speed of a fuel pump; calculating a rotational speed difference between the real-time rotational speed and the estimated rotational speed of the fuel pump; the calculated difference in rotational speed is compared with a predetermined threshold value and a corresponding signal reflecting the current operating state of the fuel pump is generated based on the comparison.
Wherein the step of obtaining an estimated rotational speed of the fuel pump comprises: the fuel pump current and voltage are taken as inputs to a look-up table unit relating to fuel pump characteristics obtained in advance from experimental data to retrieve an estimated fuel pump speed.
Further, the predetermined threshold may include a positive threshold and a negative threshold, the positive threshold being greater than the negative threshold.
Preferably, the method may further comprise: and when the rotation speed difference is smaller than or equal to the negative threshold, outputting a low level to indicate that the fuel pump is in a normal operation state.
Preferably, the method may further comprise: and when the rotating speed difference is larger than or equal to the forward threshold value, outputting a high level to indicate that the fuel pump is in a dry running state.
Preferably, the method may further comprise: maintaining a current level state when the speed difference is between the negative threshold and the positive threshold.
Preferably, the method may further comprise: when a high level is output, an alarm is issued.
Compared with the prior art, the fuel pump dry running diagnosis system based on the rotating speed can obtain a larger rotating speed buffer area, has better reliability, and can improve the safety and reliability of a fuel system
In addition, the fuel pump dry running diagnosis method provided by the invention adopts the Schmitt trigger to trigger the alarm signal, so that repeated alarm triggering caused by oscillation of the rotation speed difference near a certain threshold value can be avoided, the possibility of false triggering is eliminated, and stable fault alarm can be provided for the dry running state of the fuel pump.
Drawings
Embodiments of the invention will be further described with reference to the accompanying drawings, in which:
FIG. 1 illustrates a block diagram of a dry run diagnostic system for a fuel pump according to an exemplary embodiment of the present invention;
FIG. 2 illustrates a work flow diagram of a dry run diagnostic method for a fuel pump according to an exemplary embodiment of the present invention;
fig. 3 is a graph showing the effect of comparing a conventional dry running diagnosis method of an oil pump based on current with a dry running diagnosis method of an oil pump according to the present invention based on rotational speed.
Detailed Description
A dry running diagnostic system and method for a fuel pump according to the present invention will be described by way of example with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention to those skilled in the art. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. Rather, it is contemplated that the invention may be practiced with any combination of the following features and elements, whether or not they relate to different embodiments. Accordingly, the following methods, features, embodiments and advantages are merely illustrative and are not considered elements or limitations of the claims except where explicitly recited in a claim.
FIG. 1 illustrates a block diagram of a dry run diagnostic system for a fuel pump according to an exemplary embodiment of the present invention. As shown in FIG. 1, the system includes a real-time rotational speed detection module 30 for detecting a real-time rotational speed of the fuel pump and an estimated rotational speed acquisition module 40 for acquiring an estimated rotational speed of the fuel pump. By way of example, the real-time speed detection module 30 is coupled to the fuel pump to receive voltage and current of the fuel pump, and obtains the real-time speed of the fuel pump by detecting and linearly transforming the frequency of voltage and current pulses of the fuel pump, for example, by a current pulse based speed detection method. The voltage and current of the fuel pump can be detected by means of a detection unit (e.g. a voltage/current sensor) already present in the vehicle fuel supply system, or can be detected or calculated by means of an additionally installed detection device. In addition, the real-time rotation speed detection module 30 may also be a magnetoelectric rotation speed sensor, a photoelectric rotation speed sensor, a hall rotation speed sensor, or the like.
Further, as an example, the estimated rotational speed acquisition module 40 may include a fuel pump characteristic database 80 in which a multi-input-single-output look-up table unit related to fuel pump characteristics obtained through experimental data is stored in advance, and the estimated rotational speed of the fuel pump can be retrieved when the current and voltage of the fuel pump are taken as inputs into the look-up table unit. It should be understood by those skilled in the art that the present embodiment is exemplary only, and the present invention does not preclude the inclusion of other methods of obtaining real-time and estimated fuel pump speed.
The dry run diagnostic system for a fuel pump according to the present invention may further include a subtractor 50, and the subtractor 50 may find a rotational speed difference between the real-time rotational speed obtained by the real-time rotational speed detection module 30 and the estimated rotational speed obtained by the estimated rotational speed obtaining module 40. The system may further include a schmitt trigger 60 coupled to the subtractor 50 to receive the difference in fuel pump rotational speed therefrom, the schmitt trigger 60 generating respective signals, e.g., high and low levels, reflecting the current operating condition of the fuel pump based on the difference in rotational speed calculated by the subtractor 50.
Schmitt trigger 50 is provided with a positive threshold V + and a negative threshold V-, respectively, and the positive threshold V + can be set to be generally larger than the negative threshold V- (or the positive threshold V + can be set equal to the negative threshold V-, if necessary, in which case schmitt trigger 50 has only one threshold, i.e., is equivalent to a normal comparator). For example, the Schmitt trigger 50 may output a low level to indicate that the fuel pump is operating properly when the rotational speed difference calculated by the subtractor 50 is less than or equal to the negative threshold V-. When the rotational speed difference calculated by the subtractor 50 is greater than or equal to the forward threshold value V +, the schmitt trigger 50 may output a high level to indicate that the fuel pump is in a dry running state. If the difference in rotational speed calculated by the subtractor 50 is between the positive and negative thresholds, the output level of the schmitt trigger 50 is dependent on both the input of the subtractor 50 and the current output state of the schmitt trigger 50, e.g., if the current output state of the schmitt trigger 50 is high, it continues to remain in the high state (indicating that the fuel pump remains in the current operating state) until the difference in rotational speed input is less than the negative threshold V — it does not flip over to the low level. Those skilled in the art will appreciate that the high and low levels of the schmitt trigger output may be logic signals corresponding to digital processing circuitry.
In addition, the system may also include an alarm (not shown) coupled to the Schmitt trigger 50 that generates an alarm when a high level is received from the Schmitt trigger 50.
However, it should be understood by those skilled in the art that the above embodiment gives only one example of the output level of the schmitt trigger 50 and the alarm state of the alarm, and the present invention is not limited thereto. For example, the schmitt trigger 50 may also output a low level if the speed difference from the subtractor 50 is greater than or equal to the positive threshold V + and not flip to a high level until the speed difference reaches the negative threshold V-. For another example, the alarm may issue an alarm if a low level is received from the schmitt trigger 50 and not issue an alarm when a high level is received. The user can set the magnitude of the positive and negative thresholds of the schmitt trigger 50 as needed, and can also set the conditions under which the schmitt trigger 50 outputs a high level and under which the starting alarm gives an alarm, thereby obtaining a stable and reliable failure alarm.
FIG. 2 illustrates a work flow diagram of a dry run diagnostic method for a fuel pump according to an exemplary embodiment of the present invention. The respective steps of implementing the method for dry running diagnosis of the fuel pump will be described in detail below with reference to fig. 2.
First, in step S101, the real-time rotation speed of the fuel pump is acquired. For example, the step S101 preferably includes obtaining the real-time rotation speed of the fuel pump by detecting and linearly converting the pulse frequency of the voltage and current of the fuel pump.
Then, in step S102, an estimated rotational speed of the fuel pump is acquired. For example, as one example, step S102 includes substituting the fuel pump current and voltage into a multi-input-single-output look-up table unit that correlates fuel pump characteristics obtained in advance through experimental data to retrieve an estimated fuel pump speed.
Further, in step S103, a rotational speed difference between the real-time rotational speed and the estimated rotational speed of the fuel pump is calculated.
In step S104, the rotational speed difference calculated in step S103 is compared with a preset positive threshold V + and a preset negative threshold V- (preferably, the positive threshold V + is greater than the negative threshold V-), and a corresponding level signal is output according to the comparison result. Specifically, if it is determined in step S104 that the difference in the rotational speed of the fuel pumps is less than or equal to the negative threshold V —, a low level is output in step S105, and no alarm is issued; if it is determined in step S104 that the difference in the rotational speed of the fuel pumps is greater than or equal to the forward threshold value V +, a high level is output in step S106, and an alarm is issued; if it is determined in step S104 that the difference in the rotational speed of the fuel pump is between the negative threshold value V-and the positive threshold value V +, the current level state is maintained in step S107, and the current warning/no-warning state is maintained.
It should be understood by those skilled in the art that the dry running diagnostic system and method for a fuel pump described above can be applied not only to the dry running diagnosis of an automotive fuel pump, especially to the dry running diagnosis of a brushed direct current fuel pump, but also to the dry running diagnosis of an automotive water pump.
Fig. 3 is a graph showing the effect of comparing the conventional dry running diagnosis method of the oil pump based on current with the dry running diagnosis method of the oil pump based on rotational speed according to the present invention.
As shown in fig. 3, according to the conventional dry running diagnosis method of the oil pump based on current, since the tolerance of the mean current of the fuel pump is large, the batch products have large discreteness, thereby compressing the width of the current buffer section; in addition, the fuel pump current pulse amplitude is large, up to +/-2 amps, which further increases the dry run current dispersion and reduces the buffer.
According to the dry running diagnosis method of the fuel pump based on the rotating speed, the deviation of the dry running rotating speed is smaller, so that a larger rotating speed buffer area can be obtained compared with a current method. For example, the dry run speed variation is typically +/-200rpm, while the corresponding steady state current is about +/-0.3A, much less than the current pulse amplitude of the current method. It can be seen that the fuel pump is less likely to have a normal operating speed falling below the speed threshold curve, i.e., overlap of the normal and fault regions is avoided.
In addition, the dry running diagnosis method of the invention adopts the Schmitt trigger to trigger the alarm signal, can avoid repeated triggering alarm caused by oscillation of the rotating speed difference near a certain threshold, eliminates the possibility of false triggering, and can provide stable fault alarm for the dry running state of the fuel pump.
In summary, the fuel pump dry running diagnosis system and method according to the present invention diagnoses the dry running condition of the fuel pump based on the rotational speed information of the fuel pump, and obtains the diagnosis result of the dry running state of the fuel pump by obtaining the real-time rotational speed and the estimated rotational speed of the fuel pump and performing schmitt trigger on the difference between the real-time rotational speed and the estimated rotational speed, so that the reliability is better, and the safety and the reliability of the fuel system can be improved.
Those of ordinary skill in the art will understand that: although the above embodiments have been described with emphasis on the basic method and principle of detecting the real-time rotational speed of the fuel pump using a current pulse based rotational speed detection algorithm, the present application does not exclude that any other possible rotational speed detection unit, such as a magnetoelectric rotational speed sensor, an optoelectronic rotational speed sensor, a hall-type rotational speed sensor, etc., may be used to detect the real-time rotational speed of the fuel pump, and does not exclude that other similar processing circuits, encoding modules, coupling circuits, and programmable logic circuits are included.
In the present application, one of ordinary skill in the art will appreciate that the disclosed system may be implemented in other ways. For example, the above-described system embodiments are merely illustrative, for example, the division of the modules is only one logical division, and there may be other divisions in actual implementation, for example, the functions of a plurality of modules may be combined or the functions of a module may be further split. The real-time rotating speed detection module, the estimated rotating speed acquisition module, the subtracter, the Schmitt trigger, the alarm and the like in the fuel pump dry running diagnosis system can be integrated in one processing unit, or each module can exist alone physically, or two or more modules can be integrated in one unit. The integrated module can be realized in a form of hardware, a form of a software functional unit, or a form of a combination of software and hardware.
When the integrated unit is implemented in the form of a hardware functional unit, each module is circuit-level hardware which uses hardware logic to implement a specific function, and the connection relationship between each piece of hardware is an explicit hardware connection relationship. The network connection between the upper computer and the modules and the electric connection between the modules are realized by utilizing the hardware, and the signal transmission and processing operation is completed.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) or a microcontroller (microcontroller unit) to execute all or part of the steps of the method according to the embodiments of the present application.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks. In the embodiments of the methods of the present invention, the sequence numbers of the steps are not used to limit the sequence of the steps, and for those skilled in the art, the sequence of the steps is not changed without creative efforts.
Although the present invention has been described with reference to the preferred embodiments, it is not to be limited thereto. Various changes and modifications within the spirit and scope of the present invention will become apparent to those skilled in the art from this disclosure, and it is intended that the scope of the present invention be defined by the appended claims.
Claims (14)
1. A dry run diagnostic system for a fuel pump, the system comprising:
the real-time rotating speed detection module is used for detecting and linearly converting the voltage and current pulse frequency of the fuel pump to obtain the real-time rotating speed of the fuel pump;
an estimated rotating speed obtaining module, which is used for obtaining the estimated rotating speed of the fuel pump;
the subtractor is used for calculating the rotation speed difference between the real-time rotation speed and the estimated rotation speed; and
a Schmitt trigger that generates a corresponding signal reflecting a current operating state of the fuel pump based on the difference in rotational speed from the subtractor.
2. The dry run diagnostic system for a fuel pump according to claim 1, wherein the estimated rotation speed acquisition module includes a fuel pump characteristic database in which a look-up table unit related to fuel pump characteristics obtained through experimental data is stored in advance, and the estimated rotation speed of the fuel pump can be retrieved when voltage and current of the fuel pump are taken as inputs into the look-up table unit.
3. The dry run diagnostic system for a fuel pump of claim 1 or 2, wherein a positive threshold and a negative threshold are set for the schmitt trigger, respectively, the positive threshold being greater than the negative threshold.
4. The dry run diagnostic system for a fuel pump of claim 3, wherein the Schmitt trigger outputs a low level when the difference in rotational speed from the subtractor is less than or equal to the negative threshold, and the fuel pump is in a normal operating state.
5. The dry run diagnostic system for a fuel pump of claim 3, wherein the Schmitt trigger outputs a high level when the difference in rotational speed from the subtractor is greater than or equal to the forward threshold, and the fuel pump is in a dry run state.
6. The dry run diagnostic system for a fuel pump of claim 3, wherein the Schmitt trigger remains in its current level state when the difference in rotational speed from the subtractor is between the negative threshold and the positive threshold.
7. The dry run diagnostic system for a fuel pump of claim 1 or 2, further comprising an alarm that sounds an alarm when the schmitt trigger outputs a high level.
8. A dry run diagnostic method for a fuel pump, the method comprising the steps of:
the real-time rotating speed of the fuel pump is obtained by detecting and linearly converting the voltage pulse frequency and the current pulse frequency of the fuel pump;
acquiring an estimated rotating speed of a fuel pump;
calculating a rotational speed difference between the real-time rotational speed and the estimated rotational speed of the fuel pump; and
the calculated difference in rotational speed is compared with a predetermined threshold value and a corresponding signal reflecting the current operating state of the fuel pump is generated based on the comparison.
9. The method of claim 8, wherein the step of obtaining an estimated rotational speed of a fuel pump comprises: the fuel pump current and voltage are taken as inputs to a look-up table unit relating to fuel pump characteristics obtained in advance from experimental data to retrieve an estimated fuel pump speed.
10. The method of claim 8 or 9, wherein the predetermined thresholds include a positive threshold and a negative threshold, and wherein the positive threshold is greater than the negative threshold.
11. The method of claim 10, further comprising:
and when the rotation speed difference is smaller than or equal to the negative threshold, outputting a low level to indicate that the fuel pump is in a normal operation state.
12. The method of claim 10, further comprising:
and when the rotating speed difference is larger than or equal to the forward threshold value, outputting a high level to indicate that the fuel pump is in a dry running state.
13. The method of claim 10, further comprising:
maintaining a current level state when the speed difference is between the negative threshold and the positive threshold.
14. The method according to claim 8 or 9, characterized in that the method further comprises: when a high level is output, an alarm is issued.
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| CN113982771B (en) * | 2020-07-27 | 2023-10-27 | 纬湃汽车电子(芜湖)有限公司 | Fuel pump life assessment method and fuel pump controller thereof |
| CN113294328A (en) * | 2021-05-27 | 2021-08-24 | 盛瑞传动股份有限公司 | Fault diagnosis method for excessive difference in rotation speed of electric pump, electronic device, and storage medium |
| CN113357067B (en) * | 2021-06-24 | 2022-07-12 | 中国第一汽车股份有限公司 | Electric fuel pump control method and device, electronic equipment and storage medium |
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| JP2008121594A (en) * | 2006-11-14 | 2008-05-29 | Denso Corp | Fuel system abnormality detection device |
| JP5461380B2 (en) * | 2010-12-17 | 2014-04-02 | 愛三工業株式会社 | Pumping unit |
| JP5831765B2 (en) * | 2012-10-15 | 2015-12-09 | 株式会社デンソー | Fuel supply device |
| DE102014222335B4 (en) * | 2014-10-31 | 2020-09-03 | Vitesco Technologies GmbH | Device and method for detecting an operating pressure of a fluid pump for a motor vehicle |
| KR101846625B1 (en) * | 2015-10-23 | 2018-04-09 | 현대자동차주식회사 | System and method for diagnosing state of cooling water |
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