CN115143003A - Method for monitoring drift of total fuel injection quantity of fuel injector, monitoring device and readable storage medium - Google Patents
Method for monitoring drift of total fuel injection quantity of fuel injector, monitoring device and readable storage medium Download PDFInfo
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- CN115143003A CN115143003A CN202110345171.8A CN202110345171A CN115143003A CN 115143003 A CN115143003 A CN 115143003A CN 202110345171 A CN202110345171 A CN 202110345171A CN 115143003 A CN115143003 A CN 115143003A
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- fuel
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- drift
- injection quantity
- monitoring
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- 239000000446 fuel Substances 0.000 title claims abstract description 201
- 238000002347 injection Methods 0.000 title claims abstract description 112
- 239000007924 injection Substances 0.000 title claims abstract description 112
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000012544 monitoring process Methods 0.000 title claims abstract description 43
- 238000012806 monitoring device Methods 0.000 title claims abstract description 24
- 230000003247 decreasing effect Effects 0.000 claims 1
- 230000001360 synchronised effect Effects 0.000 abstract description 4
- 239000002828 fuel tank Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
Images
Classifications
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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
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
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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
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention provides a method, a monitoring device and a readable storage medium for monitoring drift of total fuel injection quantity of a fuel injector. The method comprises the following steps: calculating the total calculated oil injection quantity of all oil injectors of the high-pressure common rail system in a certain time; determining the total measured fuel injection quantity actually injected by all the fuel injectors in the certain time; and determining whether there is drift in the total injected fuel quantity for all injectors based on whether the deviation between the total measured injected fuel quantity and the total calculated injected fuel quantity is within a tolerance; wherein if the deviation is within the allowable deviation range, it is determined that the total fuel injection amount of all the fuel injectors does not drift; and if the deviation exceeds the allowable deviation range, determining that the total fuel injection quantity of all the fuel injectors has drift. The method is suitable for both synchronous and asynchronous high-pressure common rail systems, and can remarkably reduce the operation burden of a monitoring device.
Description
Technical Field
The present invention relates to an injector of a high pressure common rail system, and more particularly, to a method, a monitoring device, and a readable storage medium for monitoring drift of a total injection quantity of an injector.
Background
A high-pressure common rail system for supplying fuel to a diesel engine mainly includes an electronic control unit, a high-pressure oil pump, a high-pressure rail, an injector, and various sensors. The low pressure fuel pump inputs fuel into the high pressure fuel pump, the high pressure fuel pump pressurizes the fuel and sends it into the high pressure oil rail, the pressure in the high pressure oil rail is adjusted by the electronic control unit according to the pressure of the oil rail measured by the pressure sensor of the oil rail and the need, the electronic control unit determines the proper oil injection timing and oil injection duration according to the running state of the vehicle and the fuel is injected into the cylinder of the engine by the oil injector. Due to the requirement for environmental protection, current regulations regarding the requirements for exhaust emissions from engines require monitoring not only the pollutants contained in the exhaust gas itself, such as nitrogen oxides or particulate matter, but also the functional failure of the injectors of the high-pressure common rail system, at least to identify the failure of a single injector. However, with the increasing demands for environmental protection, the regulations regarding the exhaust emission requirements of the engine are becoming more and more stringent, and some national or regional regulations have required monitoring of the drift of the total fuel injection quantity of the injectors of the high-pressure common rail system, i.e., the difference between the total actual fuel injection quantity of all the injectors of the high-pressure common rail system and the calculated total calculated fuel injection quantity, in order to identify the failure of a plurality of injectors.
Existing means for monitoring fuel injector failure are based primarily on the relationship between changes in injected fuel quantity and changes in rail pressure. A method for balancing the amount of fuel injected by each cylinder (FBR) based on analyzing rail pressure signals is only suitable for monitoring the failure of a single fuel injector. The other method is an injection quality monitoring (IMR) method for monitoring the drift of the total injection quantity of a plurality of injectors based on analyzing an oil rail signal, but the method is only suitable for a high-pressure common rail system with the same or certain relation between the fuel supply times and the fuel injection times, and is limited to be suitable for an asynchronous high-pressure common rail system without a fixed relation between the fuel supply times and the fuel injection times. In addition, the latter method also needs to use complex fourier transform to calculate the total fuel injection quantity, so that the electronic control unit needs to bear a large amount of calculation work, and the calculation burden of the electronic control unit is increased.
Accordingly, there is a need for improvements in existing methods for monitoring drift in the total injected fuel quantity of a fuel injector.
Disclosure of Invention
It is an object of the present invention to overcome at least one of the above-mentioned drawbacks of the prior art and to provide a method for monitoring drift of the total injected fuel quantity of a fuel injector. The method for monitoring drift of the total fuel injection quantity of the fuel injector according to the invention can be applied to all high-pressure common rail systems including non-synchronous high-pressure common rail systems, and/or can significantly reduce the operation burden of the monitoring device.
According to one aspect of the invention, there is provided a method for monitoring drift in total injected fuel quantity of a fuel injector, the method comprising:
calculating the total calculated oil injection quantity of all oil injectors of the high-pressure common rail system within a certain time;
determining a total measured fuel injection quantity actually injected by all the fuel injectors in the certain time; and
determining whether there is a drift in the total injected fuel quantity for all injectors based on whether the deviation between the total measured injected fuel quantity and the total calculated injected fuel quantity is within a tolerance;
wherein if the deviation is within the allowable deviation range, it is determined that the total fuel injection amount of all the fuel injectors does not drift; and if the deviation exceeds the allowable deviation range, determining that the total fuel injection quantity of all the fuel injectors has drift.
According to another aspect of the present invention, there is provided a monitoring apparatus, comprising:
a processor; and
a memory having stored thereon executable instructions that, when executed, cause the processor to perform a method for monitoring drift in a total fuel injection quantity of a fuel injector as described above.
According to a further aspect of the invention, there is provided a readable storage medium, characterized by executable instructions stored thereon which, when executed, cause a machine to perform the method for monitoring drift in total fuel injection quantity of a fuel injector as described above.
The method for monitoring the drift of the total fuel injection quantity of the fuel injectors is used for determining whether the total fuel injection quantity of all the fuel injectors has drift or not on the basis of the deviation between the total fuel quantity actually consumed in a certain time and the calculated total fuel injection quantity of all the fuel injectors in the certain time, and the drift is not directly related to the fuel rail pressure signal, so that the method can be applied to a synchronous high-pressure common rail system or an asynchronous high-pressure common rail system. Furthermore, the method for monitoring the drift of the total fuel injection quantity of the fuel injector does not involve complex Fourier transform operation, and the operation burden of the monitoring device can be obviously reduced.
Drawings
FIG. 1 schematically illustrates a flow chart of a method for monitoring drift in total fuel injection quantity of a fuel injector in accordance with the present disclosure;
fig. 2 shows schematically the deviation av between the total measured fuel injection quantity of the actual injection and the total calculated fuel injection quantity versus time T; and
fig. 3 schematically shows a monitoring device according to the invention.
Detailed Description
The method for monitoring the drift of the total fuel injection quantity of the fuel injector determines whether the drift exists in the total fuel injection quantity of the fuel injector on the basis of the total fuel quantity actually consumed in a certain time and the calculated total fuel injection quantity of all the fuel injectors in the certain time, and the drift is not directly related to a fuel rail pressure signal. Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 shows a schematic flow diagram of a method according to the invention for monitoring a drift of a total fuel injection quantity of a fuel injector. As shown in fig. 1, in step S1, the method for monitoring drift of total fuel injection quantity of an injector according to the present invention first calculates a total calculated fuel injection quantity of all injectors of a high pressure common rail system for a certain period of time using a monitoring device such as an electronic control unit of a vehicle. In step S2, a monitoring device, such as an electronic control unit of a vehicle, determines a total measured injection quantity actually injected by all injectors of the high-pressure common rail system during the certain time period according to a signal sensed by a level sensor of a fuel tank. In step S3, a monitoring device, such as an electronic control unit of the vehicle, determines whether there is a drift in the total injected quantity of all injectors based on the deviation between the total measured injected quantity of the actual injection and the total calculated injected quantity. The method for monitoring drift of total fuel injection quantity of the fuel injector according to the present invention may further include a step S4 of adjusting operation of the fuel injector by a monitoring device such as an electronic control unit of a vehicle to eliminate drift of total fuel injection quantity of all fuel injectors in case it is determined that there is drift of total fuel injection quantity of all fuel injectors.
The total calculated fuel injection quantity of all fuel injectors of the high-pressure common rail system in a certain time is equal to the sum of the fuel injection quantities of all fuel injectors at the current moment in the certain time, namely, the total calculated fuel injection quantity of all fuel injectors of the high-pressure common rail system in the certain time can be obtained by integrating the fuel injection quantities of all fuel injectors at the current moment in the certain time based on time. The fuel injection quantity of all fuel injectors at the current moment can be determined according to the fuel injection quantity of a single fuel injector each time, the current rotating speed of the engine and the number of cylinders of the engine. Typically, there is one injector for each cylinder of the engine, and for a four-stroke engine, each cylinder of the engine can complete one complete combustion cycle per 2 revolutions of the engine, so that the injection quantity of all the injectors at the current moment is substantially equal to the product of the injection quantity of a single injector at a time, the current rotation speed of the engine and the number of cylinders of the engine, divided by 2. The fuel injection amount of a single fuel injector per time is converted according to the target torque (required torque) of the engine, that is, the corresponding relation between the target torque and the fuel injection amount of the single fuel injector per time can be predetermined according to experiments or experiences. The target torque is determined according to the current accelerator pedal opening sensed by the sensor and the current engine speed. Typically, the determined accelerator pedal opening and the determined engine speed correspond to an expected or required engine torque, which correspondence may also be established experimentally or empirically.
The amount of fuel reduction in the fuel tank may be taken as the total measured injected fuel quantity actually injected by all the injectors of the high pressure common rail system. The fuel tank is usually provided with a liquid level sensor, and the total measured fuel injection quantity actually injected by all fuel injectors of the high-pressure common rail system in a certain time can be determined by measuring information of the liquid level drop of the fuel tank in the certain time through the liquid level sensor.
In the new state of both the high-pressure common rail system and the engine, a monitoring device, such as an electronic control unit of the vehicle, can obtain, after a period of self-learning, the tolerance between the total calculated injection quantity and the total measured injection quantity of the actual injection for subsequent determination of whether there is a drift in the total injection quantity of all injectors. Fig. 2 schematically shows a deviation Δ V between the total measured fuel injection quantity of the actual injection and the total calculated fuel injection quantity versus time T, where the abscissa indicates time, the ordinate indicates the deviation Δ V between the total measured fuel injection quantity of the actual injection and the total calculated fuel injection quantity, and the dashed line above the abscissa indicates the upper limit value Δ V of the permissible deviation 1 And the dotted line below the abscissa represents the lower limit value Δ V of the allowable deviation 2 。
Specifically, if the deviation Δ V between the total measured injection quantity of the actual injection and the total calculated injection quantity is within the upper limit value Δ V of the allowable deviation range 1 With a lower limit value Δ V 2 In between (including the total measured injected quantity for the actual injection equals the total calculated injected quantity), it may be determined that the total injected quantity for all injectors has not drifted. If the total measured injection quantity of the actual injection is larger than the total calculated injection quantity and the deviation delta V between the two exceeds the upper limit value delta V of the allowable deviation range 1 It can be determined that there is a drift in the total injected quantity of all injectors and that the total measured injected quantity of the actual injection is larger. If the total measured fuel injection quantity of the actual injection is smaller than the total calculated fuel injection quantity and the deviation delta V between the two exceeds the lower limit value delta V of the allowable deviation range 2 It can also be determined that there is a drift in the total injected quantity of all injectors and that the total measured injected quantity of the actual injection is relatively small.
In the case of determining drift in the total injection quantity of all injectors, an electronic control unit, such as a vehicleThe monitoring device may be configured to eliminate drift in the total injected fuel quantity of all injectors by changing rail pressure or adjusting injector operation. However, in practice, changing rail pressure may have other effects on the operation of the high pressure common rail system, which may complicate the control and operation of the entire high pressure common rail system, and therefore it is feasible to adjust the operation of the injectors to eliminate drift in the total injected quantity of all injectors. Specifically, in the case where it is determined that there is a drift in the total injected fuel quantity of all the injectors and that the total measured injected fuel quantity of the actual injection is excessively large, the monitoring device, such as the electronic control unit of the vehicle, reduces the power-on time of each injector to reduce the total measured injected fuel quantity of the actual injection so that the deviation Δ V between the total measured injected fuel quantity of the actual injection and the total calculated injected fuel quantity lies within the allowable deviation range upper limit value Δ V 1 With a lower limit value Δ V 2 In the meantime. In the case where it is determined that there is a drift in the total injected fuel quantity of all the injectors and that the total measured fuel quantity of the actual injection is relatively small, a monitoring device such as an electronic control unit of a vehicle increases the power-on time of each injector to increase the total measured fuel quantity of the actual injection so that the deviation Δ V between the total measured fuel quantity of the actual injection and the total calculated fuel quantity lies within the upper limit value Δ V of the allowable deviation range 1 With a lower limit value Δ V 2 In the meantime.
The method according to the invention for monitoring the drift of the total injection quantity of the injector can be carried out continuously during the operation of the engine or at intervals or after a certain distance of travel of the vehicle, as required. For example, in a new state of the high-pressure common rail system, the degree of wear of the injector is relatively small, the possibility that a large deviation exists between the total measured fuel injection quantity of the actual injection and the total calculated fuel injection quantity is relatively small, and the method for monitoring the drift of the total fuel injection quantity of the injector can be executed at relatively long time intervals or driving mileage intervals. With the increase of the service time of the high-pressure common rail system, the degree of wear of the fuel injector is increased, the possibility that a large deviation exists between the total measured fuel injection quantity and the total calculated fuel injection quantity of the actual injection is increased, and the method for monitoring the drift of the total fuel injection quantity of the fuel injector can be executed at intervals of relatively short time or driving mileage. The time for carrying out the method according to the invention for monitoring the drift of the total injection quantity of a fuel injector can be set as desired.
Although in the above preferred embodiment the method of the invention is performed on the basis of a monitoring device, such as an electronic control unit of a vehicle, it is understood that it is also feasible to perform the method of the invention using other monitoring devices, such as a single chip microcomputer, comprising a processor and a memory instead of the electronic control unit. Fig. 3 schematically shows a monitoring device according to the invention. The monitoring device 10 according to the invention comprises a processor 11 and a memory 13 in which executable instructions are stored. The executable instructions in the memory 13, when executed, cause the processor 11 to perform a method for monitoring drift in the total injected fuel quantity of a fuel injector according to the present invention.
The method for monitoring the drift of the total fuel injection quantity of the fuel injectors is used for determining whether the total fuel injection quantity of all the fuel injectors has drift or not on the basis of the deviation between the total fuel quantity actually consumed in a certain time and the calculated total fuel injection quantity of all the fuel injectors in the certain time, and the drift is not directly related to the fuel rail pressure signal, so that the method can be applied to a synchronous high-pressure common rail system or an asynchronous high-pressure common rail system. Furthermore, the method for monitoring the drift of the total fuel injection quantity of the fuel injector does not involve complex Fourier transform operation, and the operation burden of the monitoring device can be obviously reduced.
While the invention has been described in detail in connection with the preferred embodiments thereof, it is to be understood that such detail is solely for that purpose and that no limitation of the invention is thereby intended. The scope of the invention is determined by the claims.
Claims (12)
1. A method for monitoring drift in total injected fuel quantity of a fuel injector, the method comprising:
calculating the total calculated oil injection quantity of all oil injectors of the high-pressure common rail system in a certain time;
determining the total measured fuel injection quantity actually injected by all the fuel injectors in the certain time; and
determining whether there is a drift in the total injected fuel quantity for all injectors based on whether the deviation between the total measured injected fuel quantity and the total calculated injected fuel quantity is within a tolerance;
wherein if the deviation is within the allowable deviation range, determining that the total fuel injection quantity of all the fuel injectors does not drift; and if the deviation exceeds the allowable deviation range, determining that the total fuel injection quantity of all the fuel injectors has drift.
2. The method for monitoring drift in total injected fuel mass of a fuel injector of claim 1, wherein upon determining that there is drift in total injected fuel mass of all injectors, adjusting operation of said fuel injector to eliminate drift in total injected fuel mass of all injectors.
3. The method for monitoring drift of total injected fuel quantity of a fuel injector according to claim 1 or 2, wherein said total calculated injected fuel quantity is obtained by integrating the injected fuel quantity of all said fuel injectors at the present time over time.
4. The method for monitoring drift of total injected fuel quantity of a fuel injector according to claim 3, wherein the injected fuel quantity of all fuel injectors at the current time is determined according to the injected fuel quantity of a single fuel injector at each time, the current rotating speed of the engine and the number of cylinders of the engine.
5. The method for monitoring drift of total fuel injection quantity of a fuel injector according to claim 4, wherein for a four-stroke engine, fuel injection quantity of all fuel injectors at the current moment is equal to product of fuel injection quantity of a single fuel injector at each time, current rotating speed of the engine and number of cylinders of the engine, and is divided by 2.
6. The method for monitoring drift of total fuel injection quantity of a fuel injector according to claim 5, wherein fuel injection quantity of each fuel injector is converted according to target torque of the engine, and the target torque is determined according to current accelerator pedal opening and current engine speed.
7. The method for monitoring drift in total injected fuel for a fuel injector of claim 1, wherein said total measured injected fuel is determined by a level sensor measuring information about a drop in tank level over said period of time.
8. The method for monitoring drift of a total injected fuel quantity of a fuel injector according to claim 1, wherein said tolerance is obtained by self-learning of the monitoring means over time with the high pressure common rail system and the engine in a new state.
9. The method for monitoring drift in total injected fuel mass of a fuel injector of claim 2, wherein said offset is within said allowable offset range by decreasing the power-up time of each injector to decrease said total measured injected fuel mass when said drift is present and said total measured injected fuel mass is greater than said total calculated injected fuel mass; and when the drift exists and the total measured fuel injection quantity is smaller than the total calculated fuel injection quantity, increasing the total measured fuel injection quantity by increasing the power-on time of each fuel injector so that the deviation is within the allowable deviation range.
10. A monitoring device, comprising:
a processor; and
a memory having stored thereon executable instructions that, when executed, cause the processor to perform a method for monitoring drift in total fuel injection quantity of a fuel injector as claimed in any one of claims 1 to 9.
11. The monitoring device according to claim 10, characterized in that the monitoring device is an electronic control unit of a vehicle.
12. A readable storage medium having stored thereon executable instructions which, when executed, cause a machine to perform a method for monitoring drift in total fuel injection quantity of a fuel injector as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110345171.8A CN115143003A (en) | 2021-03-31 | 2021-03-31 | Method for monitoring drift of total fuel injection quantity of fuel injector, monitoring device and readable storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110345171.8A CN115143003A (en) | 2021-03-31 | 2021-03-31 | Method for monitoring drift of total fuel injection quantity of fuel injector, monitoring device and readable storage medium |
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| Publication Number | Publication Date |
|---|---|
| CN115143003A true CN115143003A (en) | 2022-10-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110345171.8A Pending CN115143003A (en) | 2021-03-31 | 2021-03-31 | Method for monitoring drift of total fuel injection quantity of fuel injector, monitoring device and readable storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115143003A (en) |
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2021
- 2021-03-31 CN CN202110345171.8A patent/CN115143003A/en active Pending
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