CN111765014B - Method and system for monitoring leakage of high-pressure fuel system - Google Patents
Method and system for monitoring leakage of high-pressure fuel system Download PDFInfo
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- CN111765014B CN111765014B CN202010620435.1A CN202010620435A CN111765014B CN 111765014 B CN111765014 B CN 111765014B CN 202010620435 A CN202010620435 A CN 202010620435A CN 111765014 B CN111765014 B CN 111765014B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
- F02D2041/225—Leakage detection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0614—Actual fuel mass or fuel injection amount
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Examining Or Testing Airtightness (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a method and a system for monitoring leakage of a high-pressure fuel system, which relate to the field of engines, wherein the method comprises the following steps of judging whether the fuel system has a fault or not when the engine normally runs; if no fault exists, acquiring real-time rail pressure, then acquiring rail pressure deviation, and judging whether the rail pressure deviation is within a preset deviation range; if the real-time rotating speed, the real-time rail pressure, the real-time circulating oil quantity and the set flow value of the real-time oil quantity metering unit are obtained within the range; searching a preset flow value of a pre-stored oil quantity metering unit according to the real-time value; and then comparing the set flow value of the real-time oil quantity metering unit with the set flow value of the pre-stored oil quantity metering unit, if the set flow value is larger than the preset upper limit flow value, comparing the set flow value with the preset upper limit flow value, and if the set flow value is still larger than the preset upper limit flow value, generating an alarm signal. Therefore, the invention can monitor the high-pressure leakage in the high-pressure fuel system in real time, can accurately find the leakage in time and perform early warning, and is simple and easy to implement.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a method and a system for monitoring leakage of a high-pressure fuel system.
Background
As shown in fig. 1, the high-pressure common rail fuel system includes a fuel tank 1, the fuel tank 1 is communicated with a filter 4 through a low-pressure fuel pipe 3, the filter 4 is communicated with a gear pump 5 through a pipeline, the gear pump 5 acts on fuel in the fuel tank 1 to enter a high-pressure fuel pump 7, the high-pressure fuel pump 7 is communicated with a common rail pipe 10, the common rail pipe 10 is communicated with a plurality of fuel injectors 12 through a high-pressure fuel pipe, a fuel quantity metering unit 6 is arranged at the position of the high-pressure fuel pump 7, a rail pressure sensor 9 is arranged on the common rail pipe 10, and the gear pump 5, the high-pressure fuel pump 7, the fuel quantity metering unit 6 and the rail pressure sensor 9 are all electrically connected with an electric control unit 2. The electric control unit 2 can control the flow of fuel oil entering the high-pressure oil pump 7 by controlling the oil quantity metering unit 6, can obtain the current rail pressure by detecting the rail pressure sensor 9, and can realize quantitative and timed fuel oil injection by controlling the oil injector 12.
The high-pressure oil circuit in the high-pressure common rail fuel system leaks under certain conditions, but the electric control unit enables the rail pressure in the common rail pipe to reach a set value by adjusting the flow of the oil quantity metering unit, so that the oil injector can normally inject, but the leakage condition of the high-pressure oil circuit cannot be detected or is inaccurate, and machine damage or casualties are easily caused.
Disclosure of Invention
Aiming at the defects, the technical problems to be solved by the invention are as follows: the method for monitoring the leakage of the high-pressure fuel system is provided, and the high-pressure leakage in the high-pressure fuel system is monitored more timely and more accurately.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a method for monitoring leakage of a high-pressure fuel system comprises the following steps:
judging whether the fuel system has a fault or not under the condition of normal operation of the engine;
if not, acquiring real-time rail pressure in the high-pressure fuel oil pipeline;
obtaining a rail pressure deviation according to the real-time rail pressure, and judging whether the rail pressure deviation is within a preset deviation range;
if so, acquiring a real-time rotating speed, a real-time rail pressure, a real-time circulating oil quantity and a real-time oil quantity metering unit set flow value;
according to the real-time rotating speed, the real-time rail pressure and the real-time circulating oil quantity, searching a preset flow value of a pre-stored oil quantity metering unit;
judging whether the set flow value of the real-time oil quantity metering unit is larger than the set flow value of the pre-stored oil quantity metering unit or not;
if so, judging whether the set flow value of the real-time oil quantity metering unit is larger than the preset upper limit flow;
if so, an alarm signal is generated.
The pre-stored oil quantity metering unit is preferably set with a flow value which is obtained by the electronic control unit through self-learning, the electronic control unit is used for simultaneously obtaining the rotating speed, the rail pressure and the circulating oil quantity, and the rotating speed, the rail pressure, the circulating oil quantity and the flow value set by the oil quantity metering unit under the same working condition are recorded in groups and pre-stored.
Preferably, the electronic control unit is self-learning, and comprises the following steps:
judging whether the fuel system has a fault or not under the condition of normal operation of the engine;
if not, acquiring the real-time rail pressure in the high-pressure fuel pipeline;
obtaining a rail pressure deviation according to the real-time rail pressure, and judging whether the rail pressure deviation is within a preset deviation range;
if yes, acquiring a rotating speed, a rail pressure, a circulating oil quantity and a flow value set by an oil quantity metering unit;
and (4) recording and pre-storing the set flow values of the rotating speed, the rail pressure, the circulating oil quantity and the oil quantity metering unit in groups.
Preferably, the electronic control unit prestores a plurality of groups of rotating speed, rail pressure, circulating oil quantity and oil quantity metering unit set flow values through self-learning recording.
Preferably, the electronic control unit records and stores a set of rotating speed, rail pressure, circulating oil quantity and set flow value of the oil quantity metering unit under the same working condition.
Preferably, the preset upper limit flow is obtained by searching a calibration map table according to the real-time rotating speed, the real-time rail pressure and the real-time circulating oil quantity.
Preferably, the preset rail pressure deviation range is obtained by searching a calibration map table according to the real-time rail pressure.
The utility model provides a monitored control system that high pressure fuel system leaked, includes high pressure common rail fuel system and speed sensor, high pressure common rail fuel system include with the electrical unit that speed sensor electricity is connected, and respectively with rail pressure sensor, oil mass metering unit and the sprayer that the electrical unit electricity is connected, its characterized in that still include respectively with the electrical unit electricity is connected: the state detection unit is used for judging whether the fuel system has a fault or not under the condition that the engine normally runs; if not, acquiring the real-time rail pressure in the high-pressure fuel pipeline; obtaining a rail pressure deviation according to the real-time rail pressure, and judging whether the rail pressure deviation is within a preset deviation range; the leakage detection unit is used for acquiring a real-time rotating speed, a real-time rail pressure, a real-time circulating oil quantity and a set flow value of the real-time oil quantity metering unit; according to the real-time rotating speed, the real-time rail pressure and the real-time circulating oil quantity, a preset flow value of a pre-stored oil quantity metering unit is obtained through checking; judging whether the set flow value of the real-time oil quantity metering unit is larger than the set flow value of the pre-stored oil quantity metering unit or not; if so, judging whether the set flow value of the real-time oil quantity metering unit is larger than the preset upper limit flow; an alarm unit for performing an alarm; the state detection unit transmits an electric signal corresponding to the state to the electronic control unit, the electronic control unit controls the leakage detection unit to judge whether the leakage condition exists or not according to the received electric signal, the leakage detection unit transmits a corresponding electric signal to the electronic control unit according to the detection result, and the electronic control unit controls the alarm unit to alarm according to the received electric signal.
Preferably, the electronic control unit has a self-learning function, and the self-learning function is to continuously acquire and record the stored rotating speed, the rail pressure, the circulating oil quantity and the set flow value of the oil quantity metering unit.
The fuel injection device is characterized by further comprising a storage unit electrically connected with the electronic control unit, wherein the storage unit is used for recording and storing the rotating speed, the rail pressure, the circulating oil quantity and the set flow value of the oil quantity metering unit, which are acquired by the electronic control unit through self-learning.
After the technical scheme is adopted, the invention has the beneficial effects that:
the method and the system for monitoring the leakage of the high-pressure fuel system collect real-time rotating speed, real-time rail pressure, real-time circulating oil quantity and the set flow value of the real-time oil quantity measuring unit, search the set flow value of the pre-stored oil quantity measuring unit through the real-time rotating speed, the real-time rail pressure and the real-time circulating oil quantity, compare the set flow value of the real-time oil quantity measuring unit with the set flow value of the pre-stored oil quantity measuring unit, compare the set flow value of the real-time oil quantity measuring unit with the upper limit flow when the set flow value of the real-time oil quantity measuring unit is greater than the set flow value of the pre-stored oil quantity measuring unit, and alarm and give out a prompt when the set flow value of the real-time oil quantity measuring unit is greater than the upper limit flow value. Therefore, the invention can rapidly increase the set flow value of the oil quantity metering unit under the condition that the high-pressure oil way has leakage and carry out fault early warning under the same condition, thereby realizing monitoring of high-pressure leakage in the high-pressure fuel oil system, being more timely and more accurate, and being simple and easy to realize and having low cost.
Drawings
FIG. 1 is a schematic diagram of a high pressure fuel system of the present invention;
FIG. 2 is a flow chart of ECU self-learning in the present invention;
fig. 3 is a flowchart of the oil quantity leakage judgment in the present invention;
FIG. 4 is a graph showing the flow rate judgment in the embodiment;
FIG. 5 is a schematic block diagram of a high pressure fuel system leak monitoring system of the present invention;
in the figure: 1-an oil tank, 2-an electronic control unit, 3-a low-pressure oil pipe, 4-a filter, 5-a gear pump, 6-an oil mass metering unit, 7-a high-pressure oil pump, 8-an oil return pipe, 9-a rail pressure sensor, 10-a common rail pipe and 12-an oil injector.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The first embodiment is as follows:
as shown in fig. 3 and 4, a method for monitoring leakage of a high-pressure fuel system includes the following steps:
s1, judging whether a fuel system fails under the condition of normal operation of an engine;
s2, if not (no fault occurs), acquiring real-time rail pressure in a high-pressure fuel oil pipeline; if a fault occurs, no leak detection is required;
s3, obtaining a rail pressure deviation according to the real-time rail pressure, and judging whether the rail pressure deviation is within a preset deviation range; in the example, the preset rail pressure deviation range is obtained by searching a calibration map table according to the real-time rail pressure.
S4, if so (the rail pressure deviation is in the deviation range), acquiring a real-time rotating speed, a real-time rail pressure, a real-time circulating oil quantity and a real-time oil storage metering unit set flow value; if the rail pressure deviation is not within the deviation range, a real-time numerical value does not need to be obtained, and leakage detection is not carried out;
s5, searching a preset flow value of a pre-stored oil quantity metering unit according to the real-time rotating speed, the real-time rail pressure and the real-time circulating oil quantity;
s6, judging whether the set flow value of the real-time oil quantity metering unit is larger than the set flow value of the pre-stored oil quantity metering unit or not; the step is mainly used for judging whether the set flow value of the oil quantity metering unit is abnormal under the same working condition;
s7, if the flow value is larger than the preset upper limit flow value (the flow value set by the real-time oil quantity measuring unit is abnormal), judging whether the flow value set by the real-time oil quantity measuring unit is larger than the preset upper limit flow value or not; in the embodiment, the preset upper limit flow is obtained by searching a calibration map table according to the real-time rotating speed, the real-time rail pressure and the real-time circulating oil mass.
S8, if the flow value is larger than the preset upper limit flow (the flow value set by the real-time oil quantity metering unit is larger than the preset upper limit flow), the situation that the flow value set by the oil quantity metering unit is changed rapidly is shown, and the leakage fault occurs in the high-pressure oil line, an alarm signal is generated to inform a user; if the flow rate is not greater than the preset upper limit flow rate (the flow rate value set by the real-time oil quantity metering unit is not greater than the preset upper limit flow rate), indicating that no leakage fault occurs, and repeatedly executing the steps to continue monitoring.
The method for monitoring the leakage of the high-pressure fuel system searches the set flow value of the pre-stored fuel quantity measuring unit through the rotating speed, the rail pressure and the circulating fuel quantity which are acquired in real time, compares the set flow value of the real-time fuel quantity measuring unit with the set flow value of the pre-stored fuel quantity measuring unit, compares the set flow value of the real-time fuel quantity measuring unit with the upper limit flow when the real-time set flow value is larger than the pre-stored set flow value, and generates a sharp change condition if the real-time set flow value is larger than the upper limit flow. Therefore, when the high-pressure oil way leaks, the oil quantity metering unit sets the flow to be sharply increased under the same condition, and fault early warning is carried out, so that the high-pressure leakage in the high-pressure fuel oil system is monitored more timely and accurately, and the method is simple and easy to implement and low in cost. The invention solves the problems that the leakage cannot be found in time under the conditions that the high-pressure oil way in the high-pressure common rail fuel system leaks and the rail pressure can reach a set value under certain conditions, and avoids machine damage or casualties; meanwhile, the problems that due to the consistency of a fuel system, the consistency of each engine, use aging and the like are solved, the dynamic oil return of the oil sprayer, the static oil return of the oil sprayer and the PRV leakage amount cannot be accurately calculated through calibration.
The pre-stored oil quantity metering unit is used for setting a flow value, the electronic control unit obtains the rotating speed, the rail pressure and the circulating oil quantity through self-learning, and records the set flow values of the rotating speed, the rail pressure, the circulating oil quantity and the oil quantity metering unit in groups under the same working condition for pre-storing. The electronic control unit stores a plurality of groups of set flow values of the rotating speed, the rail pressure, the circulating oil quantity and the oil quantity metering unit through self-learning record; according to a preferred scheme, the electric control unit records and stores a set of set flow values of the rotating speed, the rail pressure, the circulating oil quantity and the oil quantity metering unit under the same working condition, so that the storage space is reasonably utilized.
As shown in fig. 2, the electronic control unit self-learns, including the following steps:
the method comprises the following steps of firstly, judging whether a fuel system breaks down or not under the condition of normal operation of an engine;
if not (no fault occurs), acquiring real-time rail pressure in the high-pressure fuel pipeline; if the fault occurs, self-learning is not needed, and all numerical values are not needed to be detected;
step three, obtaining rail pressure deviation according to the real-time rail pressure, and judging whether the rail pressure deviation is within a preset deviation range;
if so, acquiring the rotating speed, the rail pressure, the circulating oil quantity and a flow value set by the oil quantity metering unit; if the rail pressure deviation is not within the deviation range, the fault is indicated, and a real-time numerical value does not need to be acquired for recording and storing;
and fifthly, recording and pre-storing the set flow values of the rotating speed, the rail pressure, the circulating oil quantity and the oil quantity metering unit in groups so as to call the set flow value of the pre-stored oil quantity metering unit under the normal working condition by utilizing the real-time rotating speed, the real-time rail pressure and the real-time circulating oil quantity when leakage monitoring is carried out, and comparing the set flow value of the real-time oil quantity metering unit with the set flow value of the pre-stored oil quantity metering unit to judge whether the set flow value of the oil quantity metering unit is abnormal or not.
In the embodiment, the self-learning function of the ECU is utilized to obtain the set flow value of the oil mass metering unit under the normal condition (continuous self-learning), and the set flow value of the abnormal oil mass metering unit is alarmed, so that the high-pressure leakage in the high-pressure fuel system is monitored more timely and more accurately.
Example two:
as shown in fig. 4 and 5, a monitoring system for leakage of a high-pressure fuel system comprises a high-pressure common rail fuel system and a rotation speed sensor, wherein the high-pressure common rail fuel system comprises an electronic control unit electrically connected with the rotation speed sensor, and a rail pressure sensor, an oil quantity metering unit and an injector which are respectively electrically connected with the electronic control unit, the electronic control unit acquires rotation speed through the rotation speed sensor, acquires rail pressure through the rail pressure sensor, acquires circulating oil quantity through the injector, and acquires a set flow value of the oil quantity metering unit through the oil quantity metering unit.
The monitoring system also comprises a state detection unit, a leakage detection unit and an alarm unit which are respectively electrically connected with the electric control unit, wherein the state detection unit is used for judging whether the fuel system has a fault under the normal running condition of the engine; if not, acquiring real-time rail pressure in the high-pressure fuel oil pipeline; obtaining a rail pressure deviation according to the real-time rail pressure, and judging whether the rail pressure deviation is within a preset deviation range; the leakage detection unit is used for acquiring a real-time rotating speed, a real-time rail pressure, a real-time circulating oil quantity and a set flow value of the real-time oil quantity metering unit; according to the real-time rotating speed, the real-time rail pressure and the real-time circulating oil quantity, searching a preset flow value of a pre-stored oil quantity metering unit; judging whether the set flow value of the real-time oil quantity metering unit is larger than the set flow value of the pre-stored oil quantity metering unit or not; if the flow value is larger than the preset upper limit flow, judging whether the set flow value of the real-time oil quantity metering unit is larger than the preset upper limit flow; wherein the alarm unit is used for executing alarm; the electronic control unit has a self-learning function, and the self-learning function is used for continuously acquiring and recording the pre-stored rotating speed, the rail pressure, the circulating oil quantity and the set flow value of the oil quantity metering unit.
The fuel metering device further comprises a storage unit electrically connected with the electronic control unit, and the storage unit is used for recording and storing the set flow values of the rotating speed, the rail pressure, the circulating fuel quantity and the fuel quantity metering unit, which are obtained by the electronic control unit through self-learning.
The invention relates to a monitoring system for leakage of a high-pressure fuel system, which comprises an electronic control unit, a state detection unit, a pre-stored oil quantity measuring unit, a flow value setting unit, an upper limit flow curve, a flow value setting curve, a real-time oil quantity measuring unit, an alarm unit and an electric control unit, wherein the electronic control unit starts the state detection unit to judge the running state of an engine and transmit an electric signal corresponding to the state to the electronic control unit; the ECU self-learning function continuously acquires the set flow values of the rotating speed, the rail pressure, the circulating oil quantity and the oil quantity measuring unit, and the set flow values of the normal rotating speed, the rail pressure, the circulating oil quantity and the oil quantity measuring unit under each working condition are stored in the storage unit for leakage detection.
Therefore, the normal set flow value of the oil mass metering unit is obtained by utilizing the ECU self-learning function (continuous self-learning), and the set flow value of the abnormal oil mass metering unit is alarmed, so that the high-pressure leakage in the high-pressure fuel system is monitored more timely and more accurately. The problem of under certain circumstances, there is the leakage in the high pressure oil circuit in the high pressure common rail fuel oil system to under the rail pressure can reach the setting value, leak and can't in time discover is solved, avoid causing machine damage or casualties.
The above-described preferred embodiments of the present invention are not intended to limit the present invention, and any modifications, equivalent monitoring method and system for leakage of a high pressure fuel system, etc. within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A method for monitoring leakage of a high-pressure fuel system is characterized by comprising the following steps:
judging whether the fuel system has a fault or not under the condition of normal operation of the engine;
if not, acquiring real-time rail pressure in a common rail pipe in the high-pressure fuel pipeline;
obtaining a rail pressure deviation according to the real-time rail pressure, and judging whether the rail pressure deviation is within a preset rail pressure deviation range;
if so, acquiring a real-time rotating speed, a real-time rail pressure, a real-time circulating oil quantity and a real-time oil quantity metering unit set flow value;
according to the real-time rotating speed, the real-time rail pressure and the real-time circulating oil quantity, searching a preset flow value of a pre-stored oil quantity metering unit;
judging whether the set flow value of the real-time oil quantity metering unit is larger than the set flow value of the pre-stored oil quantity metering unit or not;
if the set flow value of the real-time oil quantity measuring unit is larger than the set flow value of the pre-stored oil quantity measuring unit, judging whether the set flow value of the real-time oil quantity measuring unit is larger than a preset upper limit flow;
if the flow value set by the real-time oil quantity metering unit is greater than the preset upper limit flow, generating an alarm signal;
prestore the flow value of oil mass measurement unit settlement by the electronic control unit through self-learning acquire, the electronic control unit acquires rotational speed, rail pressure and circulating oil mass simultaneously to rotational speed, rail pressure, circulating oil mass and oil mass measurement unit settlement flow value record prestore in groups under the same operating mode.
2. The method for monitoring leakage from a high pressure fuel system of claim 1, wherein said electronic control unit is self-learning and includes the steps of:
judging whether the fuel system has a fault or not under the condition of normal operation of the engine;
if not, acquiring real-time rail pressure in a common rail pipe in the high-pressure fuel pipeline;
obtaining rail pressure deviation according to the real-time rail pressure, and judging whether the rail pressure deviation is within a preset rail pressure deviation range;
if yes, acquiring a rotating speed, a rail pressure, a circulating oil quantity and a flow value set by an oil quantity metering unit;
and (4) recording and pre-storing the set flow values of the rotating speed, the rail pressure, the circulating oil quantity and the oil quantity metering unit in groups.
3. The method for monitoring the leakage of the high-pressure fuel system as claimed in claim 2, wherein the electronic control unit prestores a plurality of sets of set flow values of the rotating speed, the rail pressure, the circulating oil quantity and the oil quantity metering unit through self-learning recording.
4. The method for monitoring leakage of a high-pressure fuel system as claimed in claim 3, wherein the electronic control unit records and stores a set of set flow values of the rotating speed, the rail pressure, the circulating oil quantity and the oil quantity metering unit under the same working condition.
5. The method for monitoring the leakage of the high-pressure fuel system according to any one of claims 1 to 4, wherein the preset upper limit flow is obtained by searching a calibration map according to a real-time rotating speed, a real-time rail pressure and a real-time circulating oil mass.
6. The method for monitoring the leakage of the high-pressure fuel system according to claim 5, wherein the preset rail pressure deviation range is obtained by searching a calibration map table according to the real-time rail pressure.
7. The utility model provides a monitored control system that high pressure fuel system leaked, includes high pressure common rail fuel system and speed sensor, high pressure common rail fuel system include with the electrical unit that speed sensor electricity is connected, and respectively with rail pressure sensor, oil mass metering unit and the sprayer that the electrical unit electricity is connected, its characterized in that still include respectively with the electrical unit electricity is connected:
the state detection unit is used for judging whether the fuel system has a fault or not under the condition of normal operation of the engine; if not, acquiring real-time rail pressure in a common rail pipe in the high-pressure fuel pipeline; obtaining rail pressure deviation according to the real-time rail pressure, and judging whether the rail pressure deviation is within a preset rail pressure deviation range or not;
the leakage detection unit is used for acquiring a real-time rotating speed, a real-time rail pressure, a real-time circulating oil quantity and a set flow value of the real-time oil quantity metering unit when the rail pressure deviation is within a preset rail pressure deviation range; according to the real-time rotating speed, the real-time rail pressure and the real-time circulating oil quantity, a preset flow value of a pre-stored oil quantity metering unit is obtained through checking; judging whether the set flow value of the real-time oil quantity metering unit is larger than the set flow value of the pre-stored oil quantity metering unit or not; if the set flow value of the real-time oil quantity measuring unit is larger than the set flow value of the pre-stored oil quantity measuring unit, judging whether the set flow value of the real-time oil quantity measuring unit is larger than a preset upper limit flow;
the alarm unit is used for executing alarm when the flow value set by the real-time oil quantity metering unit is greater than the preset upper limit flow;
the state detection unit transmits an electric signal corresponding to the running state of the engine to the electronic control unit, the electronic control unit controls the leakage detection unit to judge whether the leakage condition exists according to the received electric signal, the leakage detection unit transmits a corresponding electric signal to the electronic control unit according to the detection result, and the electronic control unit controls the alarm unit to alarm according to the received electric signal;
the electronic control unit has a self-learning function, and the self-learning function is to continuously acquire and record the set flow values of the storage rotating speed, the rail pressure, the circulating oil quantity and the oil quantity metering unit.
8. The system for monitoring leakage of a high pressure fuel system of claim 7, further comprising a memory unit electrically connected to said electronic control unit, said memory unit adapted to record and store the rotational speed, rail pressure, circulating oil amount and set flow rate value of the oil metering unit obtained by said electronic control unit through self-learning.
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| CN114623032A (en) * | 2022-03-30 | 2022-06-14 | 湖南道依茨动力有限公司 | Fuel system diagnosis method and device, fuel system and engineering equipment |
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| CN111765014A (en) | 2020-10-13 |
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