CN114658543A - High-pressure fuel leakage diagnosis method, device and system - Google Patents
High-pressure fuel leakage diagnosis method, device and system Download PDFInfo
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- CN114658543A CN114658543A CN202210317137.4A CN202210317137A CN114658543A CN 114658543 A CN114658543 A CN 114658543A CN 202210317137 A CN202210317137 A CN 202210317137A CN 114658543 A CN114658543 A CN 114658543A
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- 239000000446 fuel Substances 0.000 title claims abstract description 188
- 238000003745 diagnosis Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000012545 processing Methods 0.000 claims abstract description 38
- 238000004891 communication Methods 0.000 claims description 6
- 230000001052 transient effect Effects 0.000 claims description 6
- 238000009825 accumulation Methods 0.000 claims description 4
- 238000010977 unit operation Methods 0.000 claims description 4
- 239000000295 fuel oil Substances 0.000 claims description 3
- 238000002405 diagnostic procedure Methods 0.000 claims 6
- 239000003921 oil Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/083—Safety, indicating, or supervising devices relating to maintenance, e.g. diagnostic device
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The invention relates to the technical field of fault diagnosis of an engine electric control system, and particularly discloses a method for diagnosing high-pressure fuel leakage of an engine, wherein the method comprises the following steps: when a high-pressure fuel leakage diagnosis function demand switch is turned on, judging the current running state of the engine according to the running parameters of the engine; if the current running state of the engine is a steady state, obtaining the high-pressure fuel leakage condition of the engine according to the calculation result accumulated by the running time of the engine; and determining a corresponding fault processing mode according to the current high-pressure fuel leakage condition. The invention also discloses a high-pressure fuel leakage diagnosis device and a high-pressure fuel leakage diagnosis system. The high-pressure fuel leakage diagnosis method for the engine provided by the invention realizes the high-pressure fuel leakage diagnosis of a non-mechanical hand section.
Description
Technical Field
The invention relates to the technical field of fault diagnosis of an engine electric control system, in particular to a high-pressure fuel leakage diagnosis method, a high-pressure fuel leakage diagnosis device and a high-pressure fuel leakage diagnosis system.
Background
At present, the common means among the detection prior art to fuel leakage in the engine high pressure oil circuit is to collect the fuel of leaking in the high pressure oil circuit through mechanical device and carry out high pressure fuel leakage detection and warning through the sensor to reduce the loss that the fuel leaked and cause, nevertheless increase input cost and assembly degree of difficulty, and engine itself does not carry out fault handling, can't in time stop the loss. Through mechanical design optimization, the fuel leakage probability in the high-pressure oil way is reduced, but the risk of leakage of the whole high-pressure oil way cannot be avoided through optimization measures of specific parts. At present, no non-mechanical high-pressure fuel leakage diagnosis and treatment method exists.
Disclosure of Invention
The invention provides a high-pressure fuel leakage diagnosis method, a high-pressure fuel leakage diagnosis device and a high-pressure fuel leakage diagnosis system, which solve the problem of lack of non-mechanical high-pressure fuel leakage diagnosis in the related technology.
As a first aspect of the present invention, there is provided an engine high-pressure fuel leakage diagnosis method, comprising:
when a high-pressure fuel leakage diagnosis function demand switch is turned on, judging the current running state of the engine according to the running parameters of the engine;
if the current running state of the engine is a steady state, obtaining the high-pressure fuel leakage condition of the engine according to the accumulated calculation result of the running time of the engine;
and determining a corresponding fault processing mode according to the current high-pressure fuel leakage condition.
Further, when the current operating state of the engine is a steady state, obtaining a high pressure fuel leakage condition of the engine according to the accumulated calculation result of the engine operating time, comprising:
calculating the operation opening increasing proportion of the flow valve;
and comparing the operation opening increasing proportion of the flow valve with the leakage coefficient to obtain the high-pressure fuel leakage condition of the engine.
Further, calculating the operation opening degree increase proportion of the flow valve comprises the following steps:
respectively acquiring a first average opening degree and a second average opening degree of the flow valve in two continuous adjacent unit operation times;
and calculating the operation opening increasing proportion of the flow valve according to the first average opening and the second average opening.
Further, comparing the operation opening increasing proportion of the flow valve with the leakage coefficient to obtain the high-pressure fuel leakage condition of the engine, the method comprises the following steps:
comparing the operation opening increasing proportion of the flow valve with a first leakage coefficient and a second leakage coefficient respectively, wherein the first leakage coefficient is smaller than the second leakage coefficient;
if the increasing proportion of the operation opening of the flow valve is smaller than a first leakage coefficient, determining that the high-pressure fuel of the engine has no leakage, and marking the leakage of the high-pressure fuel of the engine at a position 0;
if the increasing proportion of the operation opening of the flow valve is larger than or equal to the first leakage coefficient and smaller than the second leakage coefficient, determining that the high-pressure fuel of the engine is general leakage, and marking the high-pressure fuel of the engine to be 1;
and if the increase proportion of the operation opening of the flow valve is greater than or equal to the second leakage coefficient, determining that the high-pressure fuel of the engine is seriously leaked, and marking the high-pressure fuel of the engine to be in a position 2.
Further, determining a corresponding fault handling mode according to the current high-pressure fuel leakage condition includes:
when the high-pressure fuel leakage mark position 0 of the engine is arranged, the high-pressure fuel leakage fault processing mark position 0 is arranged, and fault processing is not needed;
when the high-pressure fuel leakage mark position 1 of the engine is detected, the high-pressure fuel leakage fault processing mark position 1 is detected, and a general fault processing control signal is output;
when the high-pressure fuel leakage mark position 2 of the engine is positioned, the high-pressure fuel leakage fault processing mark position 2 is processed, and a serious fault processing control signal is output;
wherein the general fault handling control signal comprises sending an alarm signal and feeding back a fault code, and the critical fault handling control signal comprises a shutdown control signal and feeding back a fault code.
Further, if the current running state of the engine is a transient state, the running time of the engine is cleared, and the engine fuel leakage zone bit at the current moment is the same as the engine fuel leakage zone bit at the previous moment.
Further, the judging the current operation state of the engine according to the operation parameters of the engine comprises the following steps:
acquiring operating parameters of an engine, wherein the operating parameters comprise engine rotating speed and engine rail pressure;
judging whether the running state of the engine is stable or not according to the running parameters of the engine;
if the running state of the engine is stable, determining that the current running state of the engine is stable;
and if the running state of the engine is unstable, determining that the current running state of the engine is transient.
Further, when the high pressure fuel leakage diagnosis function demand switch is turned off, the high pressure fuel leakage diagnosis is not performed, and the engine high pressure fuel leakage flag position 0 is set, and the high pressure fuel leakage fault processing flag position 0 is set.
As another aspect of the present invention, there is provided an engine high pressure fuel leakage diagnosis apparatus for implementing the engine high pressure fuel leakage diagnosis method described above, including:
the engine state judgment module is used for judging the current running state of the engine according to the running parameters of the engine when the high-pressure fuel leakage diagnosis function demand switch is turned on;
the engine fuel leakage condition determining module is used for obtaining the high-pressure fuel leakage condition of the engine according to the accumulated calculation result of the running time of the engine if the current running state of the engine is a steady state;
and the fault processing module is used for determining a corresponding fault processing mode according to the current high-pressure fuel leakage condition.
As another aspect of the present invention, an engine high pressure fuel leakage diagnosis system is provided, wherein the system comprises an operation parameter acquisition device, an engine electronic control unit and an upper computer, the operation parameter acquisition device is in communication connection with the engine electronic control unit, the engine electronic control unit is in communication connection with the upper computer, the engine electronic control unit comprises the engine high pressure fuel leakage diagnosis device described above,
the operating parameter acquisition device is used for acquiring the operating parameters of the engine in real time;
the engine high-pressure fuel leakage diagnosis device is used for determining the current operation state of the engine according to the operation parameters of the engine when a high-pressure fuel leakage diagnosis function demand switch is turned on, acquiring the engine high-pressure fuel leakage condition under a steady state, and outputting a corresponding fault processing mode;
and the upper computer is used for displaying the high-pressure fuel leakage condition of the engine and the corresponding fault processing mode in real time.
According to the high-pressure fuel leakage diagnosis method for the engine, whether high-pressure fuel leakage faults exist is judged through comparison of the opening degree of the proportional flow valve within the calibration time, fault diagnosis is carried out from a source of high-pressure fuel generation, single or multiple fuel leakage faults of all high-pressure parts including a fuel injector, a high-pressure fuel rail and a high-pressure fuel pipe can be covered, and high-pressure fuel leakage diagnosis of a non-mechanical hand section is achieved. In addition, the invention considers the attenuation characteristic and individual difference of the proportional flow valve, compares the opening of the proportional flow valve in the calibration time, and realizes the accurate diagnosis of the high-pressure fuel leakage under the whole life cycle of each fuel common rail system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a block diagram of a high-pressure fuel leakage diagnostic system for an engine according to the present invention.
Fig. 2 is a block diagram of a high-pressure fuel leakage diagnostic apparatus for an engine according to the present invention.
FIG. 3 is a flow chart of a method for diagnosing high pressure fuel leakage in an engine provided by the present invention.
FIG. 4 is a flowchart illustrating an exemplary implementation of a method for diagnosing high pressure fuel leakage in an engine according to the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Aiming at the problems of risks and the like caused by the fact that high-pressure fuel leakage diagnosis is carried out by adopting a mechanical means in the prior art, the embodiment of the invention provides a non-mechanical high-pressure fuel leakage diagnosis method from the control angle of an engine electric control unit.
Specifically, as shown in fig. 1, there is provided a high-pressure fuel leakage diagnosis system including: the device comprises an operation parameter acquisition device 100, an engine electronic control unit 200 and an upper computer 300, wherein the operation parameter acquisition device 100 is in communication connection with the engine electronic control unit 200, the engine electronic control unit 200 is in communication connection with the upper computer 300, the engine electronic control unit 200 comprises an engine high-pressure fuel leakage diagnosis device 210 described below,
the operation parameter acquisition device 100 is used for acquiring the operation parameters of the engine in real time;
the engine high-pressure fuel leakage diagnosis device 210 is configured to determine a current operation state of the engine according to an operation parameter of the engine when the high-pressure fuel leakage diagnosis function demand switch is turned on, obtain an engine high-pressure fuel leakage condition in a steady state, and output a corresponding fault processing mode;
the upper computer 300 is used for displaying the high-pressure fuel leakage condition of the engine and the corresponding fault processing mode in real time.
Specifically, as shown in fig. 2, the engine high pressure fuel leakage diagnosis device 210 includes:
the engine state judgment module 211 is used for judging the current operation state of the engine according to the operation parameters of the engine when the high-pressure fuel leakage diagnosis function demand switch is turned on;
an engine fuel leakage condition determining module 212, configured to obtain a high-pressure fuel leakage condition of the engine according to a calculation result accumulated during operation time of the engine if a current operation state of the engine is a steady state;
and the fault processing module 213 is configured to determine a corresponding fault processing mode according to the current high-pressure fuel leakage condition.
It should be understood that the engine high pressure fuel leakage diagnosis can be performed only when the high pressure fuel leakage diagnosis function demand switch is turned on.
When the high-pressure fuel leakage diagnosis is performed, the current operation state of the engine needs to be judged according to the operation parameters of the engine, and as described above, in the embodiment of the present invention, the current operation parameters of the engine are collected by the operation parameter collecting device. Specifically, the operating parameters of the engine may specifically include engine speed and engine rail pressure, and therefore, the operating parameter acquiring device may specifically include a speed sensor and a rail pressure sensor. The rotating speed sensor is used for acquiring the rotating speed of the engine in real time, and the rail pressure sensor is used for acquiring the rail pressure of the engine in real time.
The engine high-pressure fuel leakage diagnosis device 210 can determine the current operation state of the engine according to the operation parameters of the engine, and when the current operation state of the engine is determined to be a steady state, obtain the engine high-pressure fuel leakage condition according to the calculation result of the accumulation of the operation time of the engine, and further determine the corresponding fault processing mode.
In summary, the engine high-pressure fuel leakage diagnosis device and the engine high-pressure fuel leakage diagnosis system provided by the embodiment of the invention realize the diagnosis of the engine high-pressure fuel leakage through the improvement of the engine electric control unit, and can be realized without installing any mechanical device, thereby providing a non-mechanical high-pressure fuel leakage diagnosis mode, and effectively avoiding the risk brought by the mechanical high-pressure fuel diagnosis in the prior art. In addition, the engine high-pressure fuel leakage diagnosis device and system provided by the embodiment of the invention can also improve the fault diagnosis precision.
The following provides a method for diagnosing high-pressure fuel leakage of an engine, which is directed to a specific implementation process of the device for diagnosing high-pressure fuel leakage of an engine.
Fig. 3 is a flowchart of a method for diagnosing high-pressure fuel leakage of an engine according to an embodiment of the present invention, as shown in fig. 1, including:
s110, judging the current running state of the engine according to the running parameters of the engine when a high-pressure fuel oil leakage diagnosis function demand switch is turned on;
in the embodiment of the present invention, the judging the current operation state of the engine according to the operation parameters of the engine includes:
acquiring operating parameters of an engine, wherein the operating parameters comprise engine rotating speed and engine rail pressure;
judging whether the running state of the engine is stable or not according to the running parameters of the engine;
if the running state of the engine is stable, determining that the current running state of the engine is stable;
and if the running state of the engine is unstable, determining that the current running state of the engine is transient.
It should be noted that, the specific determination process for determining whether the operating state of the engine is stable according to the operating parameters of the engine is well known to those skilled in the art, and will not be described herein again.
It should be understood that when the engine high pressure fuel leakage diagnosis is performed, it is necessary to turn on the high pressure fuel leakage diagnosis function demand switch. If the high-pressure fuel leakage diagnosis function demand switch is in a closed state, the high-pressure fuel leakage diagnosis is not carried out, the high-pressure fuel leakage of the engine is marked at the position 0, and the high-pressure fuel leakage fault is processed to be marked at the position 0.
S120, if the current running state of the engine is a steady state, obtaining the high-pressure fuel leakage condition of the engine according to the accumulated calculation result of the running time of the engine;
in the embodiment of the invention, the diagnosis of the high-pressure fuel leakage of the engine can be performed only when the current operating state of the engine is a steady state.
When the current running state of the engine is a steady state, obtaining the high-pressure fuel leakage condition of the engine according to the accumulated calculation result of the running time of the engine, wherein the method comprises the following steps:
calculating the operation opening increasing proportion of the flow valve;
and comparing the operation opening increasing proportion of the flow valve with the leakage coefficient to obtain the high-pressure fuel leakage condition of the engine.
Further specifically, calculating the operation opening increase proportion of the flow valve comprises:
respectively acquiring a first average opening degree and a second average opening degree of the flow valve in two continuous adjacent unit operation times;
and calculating the operation opening increasing proportion of the flow valve according to the first average opening and the second average opening.
It should be understood that, for example, if the average opening degree of the flow valve in two consecutive 10 seconds is obtained as the first average opening degree a and the second average opening degree B, respectively, the calculation result of (B-a)/a is the operation opening degree increase proportion of the flow valve.
It should be noted that the unit operation time may be specifically set according to needs, and is not limited herein.
In the embodiment of the invention, the operation opening increasing proportion of the flow valve is compared with the leakage coefficient to obtain the high-pressure fuel leakage condition of the engine, and the method comprises the following steps:
comparing the operation opening increasing proportion of the flow valve with a first leakage coefficient and a second leakage coefficient respectively, wherein the first leakage coefficient is smaller than the second leakage coefficient;
if the increasing proportion of the operation opening of the flow valve is smaller than a first leakage coefficient, determining that the high-pressure fuel of the engine has no leakage, and marking the leakage of the high-pressure fuel of the engine at a position 0;
if the increasing proportion of the operation opening of the flow valve is larger than or equal to the first leakage coefficient and smaller than the second leakage coefficient, determining that the high-pressure fuel of the engine is general leakage, and marking the high-pressure fuel of the engine to be 1;
and if the increase proportion of the operation opening of the flow valve is greater than or equal to the second leakage coefficient, determining that the high-pressure fuel of the engine is seriously leaked, and marking the high-pressure fuel of the engine to be in a position 2.
The first leakage coefficient and the second leakage coefficient are also set as required, and are not limited herein.
In the embodiment of the invention, if the current running state of the engine is transient, the running time of the engine is cleared, and the fuel leakage zone bit of the engine at the current moment is the same as the fuel leakage zone bit of the engine at the previous moment.
And S130, determining a corresponding fault processing mode according to the current high-pressure fuel leakage condition.
In the embodiment of the present invention, the method specifically includes:
when the high-pressure fuel leakage mark position 0 of the engine is arranged, the high-pressure fuel leakage fault processing mark position 0 is arranged, and fault processing is not needed;
when the high-pressure fuel leakage mark position 1 of the engine is detected, the high-pressure fuel leakage fault processing mark position 1 is detected, and a general fault processing control signal is output;
when the high-pressure fuel leakage mark position 2 of the engine is positioned, the high-pressure fuel leakage fault processing mark position 2 is processed, and a serious fault processing control signal is output;
wherein the general fault handling control signal comprises sending an alarm signal and feeding back a fault code, and the critical fault handling control signal comprises a shutdown control signal and feeding back a fault code.
It should be noted that the sending of the alarm signal may specifically include sending a light alarm signal, a buzzer alarm signal, and the like. The shutdown control signal is used for controlling the engine to stop running, and corresponding fault codes are fed back whether general fault treatment or serious fault treatment is carried out.
In summary, the method for diagnosing the high-pressure fuel leakage of the engine provided by the embodiment of the invention judges whether the high-pressure fuel leakage fault exists or not by comparing the opening of the proportional flow valve within the calibration time, carries out fault diagnosis from the source of the high-pressure fuel generation, can cover single or multiple fuel leakage faults of all high-pressure parts including a fuel injector, a high-pressure fuel rail and a high-pressure fuel pipe, and realizes the purpose of carrying out high-pressure fuel leakage diagnosis on a non-mechanical arm section. In addition, the invention considers the attenuation characteristic and individual difference of the proportional flow valve, compares the opening of the proportional flow valve in the calibration time, and realizes the accurate diagnosis of the high-pressure fuel leakage under the whole life cycle of each fuel common rail system.
The specific process of the engine high-pressure fuel leakage diagnosis method provided by the embodiment of the invention is described in detail with reference to fig. 4.
Step S301: the system is powered on, ECU data are initialized, and a high-pressure fuel leakage diagnosis switch is turned on;
step S302: starting the engine until the engine runs stably at an idle speed, and judging whether the engine runs stably or not;
step S303: judging time to start accumulation, calculating the opening average value of the proportional flow valve collected and calculated once every 10s, comparing the opening average values of adjacent proportional flow valves to obtain a second leakage coefficient, an average opening increasing proportion and a first leakage coefficient, and starting accumulation of the running time at a temporary engine high-pressure fuel leakage mark position 1;
step S304: the running time meets the judgment requirement, the common fuel leakage fault is diagnosed, and the high-pressure fuel leakage mark position 1 of the engine is adopted;
step S305: and (3) at the position 1 of a high-pressure fuel leakage mark of the engine, the ECU engine carries out fault treatment: and (3) when the high-pressure fuel leakage fault processing mark position 1 is marked, a system fault lamp is turned on, and a fault code and a freeze frame are recorded, stored and output to an OBD diagnostic instrument until the fault is repaired or the requirement for clearing the fault code is received.
It will be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present invention, and the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A method of diagnosing high pressure fuel leakage in an engine, comprising:
when a high-pressure fuel leakage diagnosis function demand switch is turned on, judging the current running state of the engine according to the running parameters of the engine;
if the current running state of the engine is a steady state, obtaining the high-pressure fuel leakage condition of the engine according to the accumulated calculation result of the running time of the engine;
and determining a corresponding fault processing mode according to the current high-pressure fuel leakage condition.
2. The engine high pressure fuel leakage diagnostic method according to claim 1, wherein obtaining the engine high pressure fuel leakage condition based on the calculation result of the accumulation of the engine operation time when the current operation state of the engine is a steady state, includes:
calculating the operation opening increasing proportion of the flow valve;
and comparing the operation opening increasing proportion of the flow valve with the leakage coefficient to obtain the high-pressure fuel leakage condition of the engine.
3. The engine high pressure fuel leakage diagnostic method according to claim 2, wherein calculating the operation opening degree increase proportion of the flow valve includes:
respectively acquiring a first average opening degree and a second average opening degree of the flow valve in two continuous adjacent unit operation times;
and calculating the operation opening increasing proportion of the flow valve according to the first average opening and the second average opening.
4. The engine high pressure fuel leakage diagnostic method according to claim 2, wherein comparing the operating opening degree increase proportion of the flow valve with a leakage coefficient to obtain an engine high pressure fuel leakage condition, includes:
comparing the operation opening increasing proportion of the flow valve with a first leakage coefficient and a second leakage coefficient respectively, wherein the first leakage coefficient is smaller than the second leakage coefficient;
if the increasing proportion of the operation opening of the flow valve is smaller than a first leakage coefficient, determining that the high-pressure fuel of the engine has no leakage, and marking the leakage of the high-pressure fuel of the engine at a position 0;
if the increasing proportion of the operation opening of the flow valve is larger than or equal to the first leakage coefficient and smaller than the second leakage coefficient, determining that the high-pressure fuel of the engine is general leakage, and marking the high-pressure fuel of the engine to be 1;
and if the operation opening increasing proportion of the flow valve is greater than or equal to the second leakage coefficient, determining that the high-pressure fuel oil of the engine is seriously leaked, and marking the position 2 of the high-pressure fuel oil leakage mark of the engine.
5. The engine high pressure fuel leak diagnostic method according to claim 4, wherein determining a corresponding failure handling manner according to the current high pressure fuel leak condition includes:
when the high-pressure fuel leakage mark position 0 of the engine is arranged, the high-pressure fuel leakage fault processing mark position 0 is arranged, and fault processing is not needed;
when the high-pressure fuel leakage mark position 1 of the engine is detected, the high-pressure fuel leakage fault processing mark position 1 is detected, and a general fault processing control signal is output;
when the high-pressure fuel leakage mark position 2 of the engine is positioned, the high-pressure fuel leakage fault processing mark position 2 is processed, and a serious fault processing control signal is output;
wherein the general fault handling control signal comprises sending an alarm signal and feeding back a fault code, and the critical fault handling control signal comprises a shutdown control signal and feeding back a fault code.
6. The engine high pressure fuel leakage diagnostic method according to any one of claims 1 to 5, characterized in that if the current operating state of the engine is transient, the engine operating time is cleared, and the engine fuel leakage flag at the current time is the same as the engine fuel leakage flag at the previous time.
7. The engine high pressure fuel leakage diagnostic method according to any one of claims 1 to 5, wherein determining the current operating state of the engine based on the operating parameters of the engine includes:
acquiring operating parameters of an engine, wherein the operating parameters comprise engine rotating speed and engine rail pressure;
judging whether the running state of the engine is stable or not according to the running parameters of the engine;
if the running state of the engine is stable, determining that the current running state of the engine is stable;
and if the running state of the engine is unstable, determining that the current running state of the engine is transient.
8. The engine high pressure fuel leakage diagnosis method according to any one of claims 1 to 5, characterized in that when the high pressure fuel leakage diagnosis function demand switch is off, the high pressure fuel leakage diagnosis is not performed, and the engine high pressure fuel leakage flag is set to 0 and the high pressure fuel leakage failure processing flag is set to 0.
9. An engine high pressure fuel leakage diagnosis apparatus for implementing the engine high pressure fuel leakage diagnosis method according to any one of claims 1 to 8, characterized by comprising:
the engine state judgment module is used for judging the current running state of the engine according to the running parameters of the engine when the high-pressure fuel leakage diagnosis function demand switch is turned on;
the engine fuel leakage condition determining module is used for obtaining the high-pressure fuel leakage condition of the engine according to the accumulated calculation result of the running time of the engine if the current running state of the engine is a steady state;
and the fault processing module is used for determining a corresponding fault processing mode according to the current high-pressure fuel leakage condition.
10. A high-pressure fuel leakage diagnosis system of an engine is characterized by comprising an operation parameter acquisition device, an engine electronic control unit and an upper computer, wherein the operation parameter acquisition device is in communication connection with the engine electronic control unit, the engine electronic control unit is in communication connection with the upper computer, the engine electronic control unit comprises the high-pressure fuel leakage diagnosis device of the engine as claimed in claim 9,
the operation parameter acquisition device is used for acquiring the operation parameters of the engine in real time;
the engine high-pressure fuel leakage diagnosis device is used for determining the current operation state of the engine according to the operation parameters of the engine when a high-pressure fuel leakage diagnosis function demand switch is turned on, acquiring the engine high-pressure fuel leakage condition under a steady state, and outputting a corresponding fault processing mode;
and the upper computer is used for displaying the high-pressure fuel leakage condition of the engine and the corresponding fault processing mode in real time.
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