CN114837833A - Method and device for reducing tempering hazard of natural gas hydrogen-blended engine - Google Patents
Method and device for reducing tempering hazard of natural gas hydrogen-blended engine Download PDFInfo
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- CN114837833A CN114837833A CN202210571432.2A CN202210571432A CN114837833A CN 114837833 A CN114837833 A CN 114837833A CN 202210571432 A CN202210571432 A CN 202210571432A CN 114837833 A CN114837833 A CN 114837833A
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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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
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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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
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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
- 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
- F02D2200/1002—Output torque
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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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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The application provides a method for reducing backfire hazard of a natural gas hydrogen-blended engine. When the method is executed, the cylinder with the tempering is judged, then the calibration parameter of the hydrogen blowout reducing amount corresponding to the current working condition rotating speed and torque data in the electronic control unit is read according to the current working condition rotating speed and torque data of the cylinder with the tempering, and the hydrogen blowout reducing amount is adjusted according to the calibration parameter of the hydrogen blowout reducing amount. Therefore, by judging the cylinder with the tempering, obtaining the hydrogen injection reduction amount calibration parameters corresponding to different working conditions from the electronic control unit according to the working conditions of the tempering cylinder, and adjusting the hydrogen injection amount of the cylinder according to the hydrogen injection reduction amount calibration parameters, the effect of avoiding strong knocking caused by the tempering is achieved, and the engine is prevented from being damaged; further, the injection amount of hydrogen is reduced through accurate control, so that stable operation of the engine is not influenced while strong knocking is avoided.
Description
Technical Field
The application relates to the technical field of machine manufacturing, in particular to a method and a device for reducing tempering hazard of a natural gas hydrogen-doped engine.
Background
The natural gas-doped engine has a tempering phenomenon, the tempering is usually accompanied by strong detonation, the engine can be damaged due to the strong detonation induced by the tempering, and how to avoid the strong detonation is particularly important when the tempering occurs. The prior art does not have a forming technical scheme to deal with the harm brought by tempering.
Disclosure of Invention
In view of the above, the embodiments of the present application provide a method and an apparatus for reducing the backfire hazard of a natural gas-fueled engine, and aim to avoid the occurrence of strong knocking during the backfire in the prior art.
In a first aspect, embodiments of the present application provide a method for reducing the backfire hazard of a natural gas-blended engine, the method comprising:
determining a cylinder in which the backfire occurs;
reading a first hydrogen spraying reduction amount calibration parameter corresponding to the current working condition rotating speed and torque data in an electronic controller unit according to the current working condition rotating speed and torque data of the air cylinder with the tempering;
and adjusting the hydrogen injection amount of the cylinder with tempering according to the first hydrogen injection amount reduction calibration parameter, so that the deviation between the cylinder pressure peak value of the cylinder with tempering after the hydrogen injection amount is adjusted and the cylinder pressure peak value of the cylinder in normal operation is smaller than a preset threshold value.
Optionally, the determining the cylinder with the backfire specifically includes:
acquiring a top dead center phase of a first cylinder; the first cylinder is a cylinder which is firstly ignited according to an ignition sequence in a plurality of cylinders needing ignition;
sequentially delaying preset crank angle degrees according to an ignition sequence based on the top dead center phase of the first cylinder to obtain the top dead center phases of other cylinders needing ignition;
determining intake phases of the plurality of cylinders needing ignition according to top dead center phases of the plurality of cylinders needing ignition;
and determining a cylinder with backfire in the plurality of cylinders needing ignition according to the intake pressure signals in the intake phases of the other cylinders needing ignition.
Optionally, determining a cylinder in which flashback occurs among the cylinders requiring ignition according to the intake pressure signals in the intake phases of the cylinders requiring ignition specifically includes:
filtering the intake pressure signals of the plurality of cylinders needing ignition in the intake phase;
the filtered intake pressure signal is subjected to derivation to obtain intake pressure signal change rate data;
and judging whether the intake pressure signal change rate data is larger than a preset value or not, and taking the cylinder corresponding to the intake pressure signal change rate data larger than the preset value as the cylinder with tempering.
Optionally, before reading a first calibration parameter of the hydrogen injection reduction amount corresponding to the current operating condition rotation speed and torque data in the electronic control unit according to the current operating condition rotation speed and torque data of the cylinder with the backfire, the method further includes:
recording the hydrogen blowout reducing amount of the cylinder under different working conditions after tempering, and inputting the hydrogen blowout reducing amount corresponding to the different working conditions into the electronic control unit; the hydrogen injection reducing amount under different working conditions is the hydrogen injection reducing amount which enables the deviation between the cylinder pressure peak value of the cylinder with the hydrogen injection reducing amount and the cylinder pressure peak value of the cylinder in normal operation to be smaller than a preset threshold value.
Optionally, adjusting the hydrogen injection amount of the cylinder with tempering according to the first hydrogen injection amount reduction calibration parameter, so that the deviation between the cylinder pressure peak value of the cylinder with tempering after the hydrogen injection amount is adjusted and the cylinder pressure peak value of the cylinder in normal operation is smaller than a preset threshold, and specifically includes:
if the deviation between the cylinder pressure peak value of the tempered cylinder after the adjustment of the hydrogen injection amount and the cylinder pressure peak value of the cylinder in normal operation is not smaller than a preset threshold value after the adjustment of the hydrogen injection amount according to the first hydrogen injection amount reduction calibration parameter, reading a second hydrogen injection amount reduction calibration parameter corresponding to the working condition rotating speed and torque data after the adjustment of the hydrogen injection amount of the tempered cylinder in an electronic controller unit according to the working condition rotating speed and torque data after the adjustment of the hydrogen injection amount of the tempered cylinder;
adjusting the hydrogen injection amount of the cylinder with tempering according to the second hydrogen injection reduction amount calibration parameter; and when the deviation between the cylinder pressure peak value of the cylinder with the tempering occurrence after the hydrogen injection amount is adjusted and the cylinder pressure peak value of the cylinder in normal operation is smaller than a preset threshold value, stopping adjusting the hydrogen injection amount of the cylinder with the tempering occurrence.
In a second aspect, embodiments of the present application provide an apparatus for reducing the backfire hazard of a natural gas-blended engine, the apparatus comprising:
the device comprises a detection module, a data acquisition module and a data adjustment module;
the detection module is used for determining the cylinder with the backfire;
the data acquisition module is used for reading a first hydrogen spraying reduction amount calibration parameter corresponding to the current working condition rotating speed and torque data in an electronic controller unit according to the current working condition rotating speed and torque data of the air cylinder with the tempering;
the data adjusting module is used for adjusting the hydrogen injection amount of the cylinder with tempering according to the first hydrogen injection amount reduction calibration parameter, so that the deviation between the cylinder pressure peak value of the cylinder with tempering after the hydrogen injection amount is adjusted and the cylinder pressure peak value of the cylinder in normal operation is smaller than a preset threshold value.
Optionally, the apparatus further includes a phase acquisition module;
the phase acquisition module is used for acquiring a top dead center phase of the first cylinder; the first cylinder is a cylinder which is firstly ignited according to an ignition sequence in a plurality of cylinders needing ignition;
sequentially delaying preset crank angle degrees according to an ignition sequence based on the top dead center phase of the first cylinder to obtain the top dead center phases of other cylinders needing ignition;
determining intake phases of the plurality of cylinders needing ignition according to top dead center phases of the plurality of cylinders needing ignition;
the detection module is specifically used for determining a cylinder with backfire in the plurality of cylinders needing ignition according to the intake pressure signals of the other cylinders needing ignition in the intake phase.
Optionally, the apparatus further comprises a signal processing module;
the signal processing module is used for filtering intake pressure signals of the plurality of cylinders needing ignition in the intake phase; the filtered intake pressure signal is subjected to derivation to obtain intake pressure signal change rate data;
the detection module is specifically configured to determine whether the intake pressure signal change rate data is greater than a preset value, and use the cylinder corresponding to the intake pressure signal change rate data greater than the preset value as the cylinder in which the backfire occurs.
Optionally, the data obtaining module is further configured to:
recording the hydrogen blowout reducing amount of the cylinder under different working conditions after tempering, and inputting the hydrogen blowout reducing amount corresponding to the different working conditions into the electronic control unit; the hydrogen injection reducing amount under different working conditions is the hydrogen injection reducing amount which enables the deviation between the cylinder pressure peak value of the cylinder with the hydrogen injection reducing amount and the cylinder pressure peak value of the cylinder in normal operation to be smaller than a preset threshold value.
Optionally, the data obtaining module is specifically configured to, if the deviation between the cylinder pressure peak value of the tempered cylinder after the adjustment of the hydrogen injection amount and the cylinder pressure peak value of the cylinder in normal operation is not smaller than a preset threshold value after the adjustment of the hydrogen injection amount according to the first hydrogen injection amount reduction calibration parameter, read a second hydrogen injection amount reduction calibration parameter corresponding to the operating condition rotation speed and torque data after the adjustment of the hydrogen injection amount by the tempered cylinder in the electronic controller unit according to the operating condition rotation speed and torque data after the adjustment of the hydrogen injection amount by the tempered cylinder;
the data adjusting module is specifically used for adjusting the hydrogen injection amount of the cylinder with tempering according to the second hydrogen injection reduction amount calibration parameter; and when the deviation between the cylinder pressure peak value of the cylinder with the tempering occurrence after the hydrogen injection amount is adjusted and the cylinder pressure peak value of the cylinder in normal operation is smaller than a preset threshold value, stopping adjusting the hydrogen injection amount of the cylinder with the tempering occurrence.
The embodiment of the application provides a method for reducing the backfire hazard of a natural gas hydrogen-blended engine. When the method is executed, the cylinder with the tempering is judged, then the calibration parameter of the hydrogen blowout reducing amount corresponding to the current working condition rotating speed and torque data in the electronic control unit is read according to the current working condition rotating speed and torque data of the cylinder with the tempering, and the hydrogen blowout reducing amount is adjusted according to the calibration parameter of the hydrogen blowout reducing amount. Therefore, by judging the cylinder with the tempering, obtaining the hydrogen injection reduction amount calibration parameters corresponding to different working conditions from the electronic control unit according to the working conditions of the tempering cylinder, and adjusting the hydrogen injection amount of the cylinder according to the hydrogen injection reduction amount calibration parameters, the effect of avoiding strong knocking caused by the tempering is achieved, and the engine is prevented from being damaged; further, the injection amount of hydrogen is reduced through accurate control, so that stable operation of the engine is not influenced while strong knocking is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1A is a schematic illustration of a flashback and normal combustion cylinder pressure curve provided by an embodiment of the present application;
FIG. 1B is a layout diagram of an intake pipe, an intake pressure sensor, and a hydrogen nozzle of a natural gas loading engine according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of a method for reducing backfire hazard in a natural gas-fueled engine according to an embodiment of the present disclosure;
FIG. 3 is a flowchart of a method for determining top dead center phase for each cylinder according to an embodiment of the present disclosure;
FIG. 4 is a flowchart of a method for determining an intake phase for each cylinder according to an embodiment of the present disclosure;
FIG. 5 is a graph of inlet pressure signals for both tempered and untempered conditions as provided by an embodiment of the present application;
FIG. 6 is a logic diagram of a flashback judgment provided in an embodiment of the present application;
FIG. 7 is a schematic structural diagram of an apparatus for reducing the backfire hazard of a natural gas-fueled engine according to an embodiment of the present disclosure;
FIG. 8 is a schematic structural diagram of another apparatus for reducing the backfire hazard of natural gas-fueled engines according to an embodiment of the present disclosure;
FIG. 9 is a schematic structural diagram of another apparatus for reducing the backfire hazard of natural gas-fueled engines according to an embodiment of the present disclosure.
Detailed Description
The natural gas engine has the problems of low combustion speed, poor heat efficiency, high methane emission, high exhaust temperature and the like. The natural gas can be mixed with hydrogen to effectively improve the combustion speed, improve the heat efficiency, reduce the methane emission and reduce the exhaust temperature, and the trend of double carbon is met. However, when the hydrogen loading is relatively high, a tempering phenomenon occurs, and the tempering is usually accompanied by a sharp rise in cylinder pressure for the next cycle or several cycles, i.e., a strong knocking.
The inventor of the present application has found through analysis that fig. 1A provides a schematic diagram of cylinder pressure curves for flashback and normal combustion in an embodiment of the present application, as shown in fig. 1A, in which a solid line is a cylinder pressure curve for several consecutive cycles of a cylinder during normal combustion, and a dotted line is a cylinder pressure curve for several cycles of the cylinder during occurrence of flashback. It can be seen that in the cycle of backfire, the backfire phenomenon (corresponding to the small wave crest of the broken line at the leftmost end in the figure) occurs just before the intake valve is opened, the cylinder pressure is obviously reduced, and more fuel remains in the cylinder in the first cycle. The cylinder pressure rises sharply in the second cycle after the occurrence of the flashback because the cylinder has more fuel left in the previous cycle and the fuel injected in the present cycle than is required. After a few cycles, the effect of tempering gradually weakens, and the cylinder pressure gradually recovers. Flashback-induced intense knock can lead to engine damage, and it is important to avoid this phenomenon.
The inventor considers that the unburned fuel in the cylinder in the previous cycle and the fuel continuously injected into the cylinder in the next cycle can cause the fuel in the cylinder in the next cycle to be larger than the required amount so as to cause the cylinder pressure to rise sharply and cause strong knocking due to the influence of the occurrence of backfire; if the next cycle does not inject fuel, stable operation of the engine may be affected. Based on this, the inventor provides the solution of the present application by reducing the fuel injected into the cylinder every cycle so that the fuel injected in the previous cycle plus the fuel injected in the reduced amount is approximately equal to the fuel content required for the normal cylinder pressure. Therefore, the problem of strong detonation is avoided by reducing and spraying hydrogen gas in the tempering cylinder, and meanwhile, the stable operation of the engine is ensured by accurately controlling the spray reducing amount.
As shown in fig. 1B, fig. 1B is a layout diagram of an intake pipe, an intake pressure sensor and a hydrogen nozzle of a natural gas hydrogen-loading engine. The air inlet main pipe is divided into two branch pipes, one branch pipe leads to 1 cylinder, 2 cylinder and 3 cylinder, the other branch pipe leads to 4 cylinder, 5 cylinder and 6 cylinder, and the branch pipes lead out three branch pipes respectively and enter into each cylinder. A hydrogen multi-point injection system is added on the basis of the gas inlet single-point injection natural gas engine and comprises a hydrogen source, a hydrogen rail and a hydrogen nozzle. As shown in the figure, air inlet pressure sensors are respectively arranged on the two air inlet branch pipes and are used for judging the tempering occurrence time and the corresponding cylinders. A hydrogen nozzle is arranged on the air inlet manifold of each cylinder, so that the dynamic adjustment of the hydrogen injection amount of each cylinder is ensured.
The technical solutions 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 application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 2, fig. 2 is a flowchart of a method for reducing the backfire hazard of a natural gas-loaded engine according to an embodiment of the present application, including:
s201, determining the cylinder with the backfire.
And determining the intake phase of each cylinder according to the top dead center phase of each cylinder, and judging which cylinder has backfire according to an intake pressure signal corresponding to the intake phase of each cylinder when the backfire occurs. The cylinder with the tempering is judged to be convenient for adjusting the amount of the hydrogen sprayed into the cylinder according to the cylinder pressure curve of the cylinder with the tempering.
S202, reading a first hydrogen spraying reduction amount calibration parameter corresponding to the current working condition rotating speed and torque data in the electronic controller unit according to the current working condition rotating speed and torque data of the air cylinder with the tempering.
The embodiment of the application needs to calibrate the hydrogen blowout reducing amount of the tempered cylinder on the rack, and inputs the blowout reducing amount data of different cycles after the tempering of the calibrated different working conditions into an Electronic Control Unit (ECU). Therefore, after the cylinder is tempered, a first hydrogen injection reduction amount calibration parameter corresponding to the current working condition rotating speed and torque data in the electronic controller unit can be read according to the current working condition rotating speed and torque data of the tempered cylinder.
S203, adjusting the hydrogen injection amount of the cylinder with tempering according to the first hydrogen injection amount reduction calibration parameter, so that the deviation between the cylinder pressure peak value of the cylinder with tempering after the hydrogen injection amount is adjusted and the cylinder pressure peak value of the cylinder in normal operation is smaller than a preset threshold value.
Adjusting the hydrogen injection amount according to the hydrogen injection amount reduction calibration parameter read in the step S202, if the deviation between the cylinder pressure of the cylinder and the cylinder pressure peak value of the cylinder in normal operation is smaller than a preset threshold value after the hydrogen injection amount is reduced in the first cycle after tempering, the threshold value can be set according to needs and can be generally set to 10%, the cylinder pressure of the cylinder is considered to be the normal cylinder pressure, and the subsequent cycle does not need to reduce the hydrogen injection amount; if the deviation of the cylinder pressure of the cylinder from the peak cylinder pressure of the cylinder in normal operation is not less than 10% after the first cycle is subjected to the hydrogen injection amount reduction, the operation of reducing the hydrogen injection amount is continued in the next cycle.
Therefore, after one or more times of hydrogen injection quantity reduction, the cylinder pressure of the cylinder is finally recovered to the cylinder pressure of normal operation, strong detonation caused by backfire is avoided, the hydrogen injection quantity reduction replaces hydrogen injection stopping, and stable operation of the engine is guaranteed while the strong detonation is avoided.
In an alternative embodiment of the present application, the specific process of determining the cylinder with the flashback may be determined by determining a top dead center phase TDC of each cylinder, then determining an intake phase of each cylinder according to the top dead center phase of each cylinder, and determining whether the cylinder with the flashback is a cylinder number of the cylinder according to an intake pressure signal corresponding to the intake phase of each cylinder.
Fig. 3 is a flowchart of a method for determining a top dead center phase of each cylinder according to an embodiment of the present application, and as shown in fig. 3, a top dead center phase of a first cylinder is first obtained, where the first cylinder is a first cylinder to be ignited in an ignition sequence from among a plurality of cylinders to be ignited, and the first cylinder is, for example, a cylinder No. 1.
The determination process of the cylinder No. 1 top dead center phase TDC1 is shown in FIG. 3, which is a signal topology diagram formed by one rotation of a crankshaft signal disc and a camshaft signal disc respectively. The camshaft signal disc usually adopts a layout form of 6+1 teeth, 6 in 6+1 are 6 teeth named as SEG 0-SEG 5, and 1 in 6+1 is a tooth named as SYNC. SEG0 to SEG5 are arranged at equal angles with the axis as the center of a circle, the Hall sensor can acquire long pulse signals, and the interval between SYNC and SEG5 is small, so that short pulse signals can be formed. The SYNC phase and the TDC1 of the cylinder top dead center phase No. 1 have a clear phase difference relationship in geometry, when the camshaft rotates and the Hall sensor detects a short pulse signal, the cylinder top dead center No. 1 can be calculated through the phase difference, and the phase difference is defined as 0 degree of crank angle. The ignition sequence of the 6 cylinders is that a No. 1 cylinder, a No. 5 cylinder, a No. 3 cylinder, a No. 6 cylinder, a No. 2 cylinder and a No. 4 cylinder, and the top dead centers of the cylinders corresponding to the ignition sequence are respectively 0 degree, 120 degree, 240 degree, 360 degree, 480 degree and 600 degree. And sequentially delaying the top dead centers of other cylinders by preset crank angle degrees according to the ignition sequence, wherein the preset crank angle degrees can be 720/cylinder crank angle degrees, and obtaining the top dead center phases of other cylinders.
Fig. 4 is a flowchart of a method for determining an intake phase of each cylinder according to an embodiment of the present application, and as shown in fig. 4, the intake phase of each cylinder is determined according to a phase marking rule and a corresponding relationship according to a top dead center phase of each cylinder.
Fig. 5 is a graph of intake pressure signals during tempering and non-tempering according to the embodiment of the present application, and it is determined from the intake pressure signals corresponding to the intake phases of the cylinders that several cylinders are in tempering, as shown in fig. 5, the intake pressure during tempering is significantly increased. In order to judge whether the engine is in backfire, filtering an original signal of the air inlet pressure sensor, then obtaining a derivative of the filtered pressure signal to obtain pressure signal change rate data, and when the pressure signal change rate is larger than a limit value (the limit value is determined according to an engine bench test empirical value), considering that the backfire occurs.
Referring to fig. 6, fig. 6 is a logic diagram for determining flashback, in which an original signal is input, filtered, and then derived from the filtered pressure signal to obtain pressure signal change rate data, and it is determined whether the pressure signal change rate data is greater than a limit value, the limit value is determined according to an engine bench test experience value, and if the pressure signal change rate data is greater than the limit value, a flashback is determined; if not, it is determined that no tempering has occurred.
The optional embodiment of this application, the cylinder that needs take place the tempering reduces the volume of spouting to carry out hydrogen on the rack and marks, and the concrete implementation process is: observing a cylinder pressure curve of the cylinder with the tempering, adjusting the hydrogen injection reducing amount of the first cycle of the cylinder after the tempering until the maximum value of the cylinder pressure is the same as that before the tempering, recording the hydrogen injection reducing amount at the moment as m1, then adjusting the hydrogen injection reducing amount of the second cycle of the cylinder after the tempering on the basis until the cylinder pressure curve is the same as that before the tempering, recording the hydrogen injection reducing amount of the cycle as m2, and so on to obtain the hydrogen injection reducing amount mn of the nth cycle after the tempering. And (3) recovering the hydrogen injection amount before the cylinder is tempered, and if the deviation between the cylinder pressure peak value Pmax1 and the normal operation cylinder pressure peak value Pmax0 before tempering is smaller than the threshold value X (for example, X is 10%), the hydrogen injection amount is not reduced in the cycle after the cylinder, so that the hydrogen injection reduction amount and the injection stop time of each cycle after the condition is tempered are obtained. According to the method, the blowout reduction amount data of different cycles after the backfire under different working conditions occurs are obtained and input into an Electronic Control Unit (ECU). Therefore, by calibrating the hydrogen blowout reducing amount of the cylinder with the tempering on the rack, when the subsequent hydrogen blowout reducing amount of the cylinder with the tempering is processed, the reduced hydrogen blowout amount under the working condition can be known only according to the obtained actual working condition of the cylinder and the corresponding relation between the actual working condition and the calibrated hydrogen blowout reducing amount. The effect of avoiding strong knocking due to the backfire is achieved.
In an optional embodiment of the present application, if the deviation between the cylinder pressure peak value of the tempered cylinder after adjusting the hydrogen injection amount and the cylinder pressure peak value of the cylinder in normal operation is not less than the preset threshold value after adjusting the hydrogen injection amount according to the first hydrogen injection reduction amount calibration parameter, that is, the cylinder pressure peak value in stable operation is not reached, the hydrogen reduction amount adjustment of the next cycle is performed, that is, according to the working condition rotating speed and torque data after adjusting the hydrogen injection amount by the tempered cylinder, a second hydrogen injection reduction amount calibration parameter corresponding to the working condition rotating speed and torque data after adjusting the hydrogen injection amount by the tempered cylinder in the electronic controller unit is read, and the hydrogen injection amount of the tempered cylinder is adjusted according to the second hydrogen injection reduction amount calibration parameter; and stopping adjusting the hydrogen injection amount of the cylinder with the tempering until the deviation between the cylinder pressure peak value of the cylinder with the tempering after adjusting the hydrogen injection amount and the cylinder pressure peak value of the cylinder in normal operation is smaller than a preset threshold value.
Thus, the cylinder pressure of the cylinder is restored to the cylinder pressure in normal operation through one or more adjustments of the injected amount of hydrogen.
The above embodiments provide some specific implementation manners of a method for reducing the backfire hazard of a natural gas-doped engine, and based on this, the application also provides a device for reducing the backfire hazard of a natural gas-doped engine. The device provided by the embodiment of the present application will be described in terms of functional modularity.
Fig. 7 is a schematic structural diagram of an apparatus for reducing the backfire hazard of a natural gas-blended engine according to an embodiment of the present disclosure, where the apparatus includes a detection module 701, a data acquisition module 702, and a data adjustment module 703;
the detection module 701 is used for determining a cylinder with backfire;
the data acquisition module 702 is configured to read a first hydrogen blowout reduction amount calibration parameter corresponding to current operating condition rotation speed and torque data in an electronic controller unit according to the current operating condition rotation speed and torque data of the air cylinder in which tempering occurs;
the data adjusting module 703 is configured to adjust the hydrogen injection amount of the cylinder with tempering according to the first hydrogen injection amount decreasing calibration parameter, so that a deviation between a cylinder pressure peak value of the cylinder with tempering after the hydrogen injection amount is adjusted and a cylinder pressure peak value of the cylinder in normal operation is smaller than a preset threshold value.
An alternative embodiment of the present application provides another apparatus, a schematic structural diagram of which is shown in fig. 8, and the apparatus includes a detection module 701, a data acquisition module 702, a data adjustment module 703, and a phase acquisition module 704;
the phase obtaining module 704 is configured to obtain a top dead center phase of the first cylinder; the first cylinder is a cylinder which is firstly ignited according to an ignition sequence in a plurality of cylinders needing ignition;
sequentially delaying preset crank angle degrees according to an ignition sequence based on the top dead center phase of the first cylinder to obtain the top dead center phases of other cylinders needing ignition;
determining intake phases of the plurality of cylinders needing ignition according to top dead center phases of the plurality of cylinders needing ignition;
the detection module 701 is specifically configured to determine, according to the intake pressure signals in the intake phases of the other cylinders requiring ignition, a cylinder in which a flashback occurs among the cylinders requiring ignition.
An alternative embodiment of the present application provides another apparatus, a schematic structural diagram of which is shown in fig. 9, and the apparatus includes a detection module 701, a data acquisition module 702, a data adjustment module 703, a phase acquisition module 704, and a signal processing module 705;
the signal processing module 705 is configured to perform filtering processing on the intake pressure signal in the intake phase of each of the cylinders requiring ignition; the filtered intake pressure signal is subjected to derivation to obtain intake pressure signal change rate data;
the detection module 701 is specifically configured to determine whether the intake pressure signal change rate data is greater than a preset value, and use an air cylinder corresponding to the intake pressure signal change rate data greater than the preset value as an air cylinder in which tempering occurs.
In an alternative embodiment of the present application, the data obtaining module 702 is further configured to:
recording the hydrogen blowout reducing amount of the cylinder under different working conditions after tempering, and inputting the hydrogen blowout reducing amount corresponding to the different working conditions into the electronic control unit; the hydrogen injection reducing amount under different working conditions is the hydrogen injection reducing amount which enables the deviation between the cylinder pressure peak value of the cylinder with the hydrogen injection reducing amount and the cylinder pressure peak value of the cylinder in normal operation to be smaller than a preset threshold value.
In an optional embodiment of the present application, the data obtaining module 702 is specifically configured to, if the deviation between the cylinder pressure peak value of the tempered cylinder after adjusting the hydrogen injection amount and the cylinder pressure peak value of the cylinder in normal operation is not smaller than a preset threshold value after adjusting the hydrogen injection amount of the tempered cylinder according to the first hydrogen injection amount reduction calibration parameter, read a second hydrogen injection amount calibration parameter corresponding to the operating condition rotation speed and the torque data after adjusting the hydrogen injection amount of the tempered cylinder in an electronic controller unit according to the operating condition rotation speed and the torque data after adjusting the hydrogen injection amount of the tempered cylinder;
the data adjusting module 703 is specifically configured to adjust the hydrogen injection amount of the tempered cylinder according to the second hydrogen reduction injection amount calibration parameter; and when the deviation between the cylinder pressure peak value of the cylinder with the tempering occurrence after the hydrogen injection amount is adjusted and the cylinder pressure peak value of the cylinder in normal operation is smaller than a preset threshold value, stopping adjusting the hydrogen injection amount of the cylinder with the tempering occurrence.
In the embodiments of the present application, the names "first" and "second" (if present) in the names "first" and "second" are used for name identification, and do not represent the first and second in sequence.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only an exemplary embodiment of the present application, and is not intended to limit the scope of the present application.
Claims (10)
1. A method of reducing the backfire hazard of a natural gas-fuelled engine, the method comprising:
determining a cylinder in which the backfire occurs;
reading a first hydrogen spraying reduction amount calibration parameter corresponding to the current working condition rotating speed and torque data in an electronic controller unit according to the current working condition rotating speed and torque data of the air cylinder with the tempering;
and adjusting the hydrogen injection amount of the cylinder with tempering according to the first hydrogen injection amount reduction calibration parameter, so that the deviation between the cylinder pressure peak value of the cylinder with tempering after the hydrogen injection amount is adjusted and the cylinder pressure peak value of the cylinder in normal operation is smaller than a preset threshold value.
2. The method according to claim 1, wherein the determining of a cylinder in which flashback has occurred specifically comprises:
acquiring a top dead center phase of a first cylinder; the first cylinder is a cylinder which is firstly ignited according to an ignition sequence in a plurality of cylinders needing ignition;
sequentially delaying preset crank angle degrees according to an ignition sequence based on the top dead center phase of the first cylinder to obtain the top dead center phases of other cylinders needing ignition;
determining intake phases of the plurality of cylinders needing ignition according to top dead center phases of the plurality of cylinders needing ignition;
and determining a cylinder with backfire in the plurality of cylinders needing ignition according to the intake pressure signals in the intake phases of the other cylinders needing ignition.
3. The method according to claim 2, wherein determining a cylinder in the plurality of cylinders requiring ignition which has a flashback based on the intake pressure signal at the intake phase of the plurality of cylinders requiring ignition comprises:
filtering the intake pressure signals of the plurality of cylinders needing ignition in the intake phase;
the filtered intake pressure signal is subjected to derivation to obtain intake pressure signal change rate data;
and judging whether the intake pressure signal change rate data is larger than a preset value or not, and taking the cylinder corresponding to the intake pressure signal change rate data larger than the preset value as the cylinder with tempering.
4. The method according to claim 1, wherein reading a first calibration parameter of hydrogen blowout reduction amount corresponding to the current operating condition speed and torque data in an electronic control unit according to the current operating condition speed and torque data of the cylinder with the occurrence of the flashback further comprises:
recording the hydrogen blowout reducing amount of the cylinder under different working conditions after tempering, and inputting the hydrogen blowout reducing amount corresponding to the different working conditions into the electronic control unit; the hydrogen injection reducing amount under different working conditions is the hydrogen injection reducing amount which enables the deviation between the cylinder pressure peak value of the cylinder with the hydrogen injection reducing amount and the cylinder pressure peak value of the cylinder in normal operation to be smaller than a preset threshold value.
5. The method according to claim 1, wherein the step of adjusting the hydrogen injection amount of the cylinder with the occurrence of backfire according to the first hydrogen injection amount reduction calibration parameter so that the deviation between the cylinder pressure peak value of the cylinder with the occurrence of backfire after the adjustment of the hydrogen injection amount and the cylinder pressure peak value of the cylinder in normal operation is smaller than a preset threshold value comprises the following steps:
if the deviation between the cylinder pressure peak value of the tempered cylinder after the adjustment of the hydrogen injection amount and the cylinder pressure peak value of the cylinder in normal operation is not smaller than a preset threshold value after the adjustment of the hydrogen injection amount according to the first hydrogen injection amount reduction calibration parameter, reading a second hydrogen injection amount reduction calibration parameter corresponding to the working condition rotating speed and torque data after the adjustment of the hydrogen injection amount of the tempered cylinder in an electronic controller unit according to the working condition rotating speed and torque data after the adjustment of the hydrogen injection amount of the tempered cylinder;
adjusting the hydrogen injection amount of the cylinder with tempering according to the second hydrogen injection reduction amount calibration parameter; and when the deviation between the cylinder pressure peak value of the cylinder with the tempering occurrence after the hydrogen injection amount is adjusted and the cylinder pressure peak value of the cylinder in normal operation is smaller than a preset threshold value, stopping adjusting the hydrogen injection amount of the cylinder with the tempering occurrence.
6. A method apparatus for reducing the backfire hazard of a natural gas-fueled engine, the apparatus comprising: the device comprises a detection module, a data acquisition module and a data adjustment module;
the detection module is used for determining the cylinder with the backfire;
the data acquisition module is used for reading a first hydrogen spraying reduction amount calibration parameter corresponding to the current working condition rotating speed and torque data in the electronic controller unit according to the current working condition rotating speed and torque data of the air cylinder with tempering;
the data adjusting module is used for adjusting the hydrogen injection amount of the cylinder with tempering according to the first hydrogen injection amount reduction calibration parameter, so that the deviation between the cylinder pressure peak value of the cylinder with tempering after the hydrogen injection amount is adjusted and the cylinder pressure peak value of the cylinder in normal operation is smaller than a preset threshold value.
7. The apparatus of claim 6, further comprising a phase acquisition module;
the phase acquisition module is used for acquiring a top dead center phase of the first cylinder; the first cylinder is a cylinder which is firstly ignited according to an ignition sequence in a plurality of cylinders needing ignition;
sequentially delaying preset crank angle degrees according to an ignition sequence based on the top dead center phase of the first cylinder to obtain the top dead center phases of other cylinders needing ignition;
determining intake phases of the plurality of cylinders needing ignition according to top dead center phases of the plurality of cylinders needing ignition;
the detection module is specifically used for determining a cylinder with backfire in the plurality of cylinders needing ignition according to the intake pressure signals of the other cylinders needing ignition in the intake phase.
8. The apparatus of claim 7, further comprising a signal processing module;
the signal processing module is used for filtering intake pressure signals of the plurality of cylinders needing ignition in the intake phase; the filtered intake pressure signal is subjected to derivation to obtain intake pressure signal change rate data;
the detection module is specifically configured to determine whether the intake pressure signal change rate data is greater than a preset value, and use the cylinder corresponding to the intake pressure signal change rate data greater than the preset value as the cylinder in which the backfire occurs.
9. The apparatus of claim 6, wherein the data acquisition module is further configured to:
recording the hydrogen blowout reducing amount of the cylinder under different working conditions after tempering, and inputting the hydrogen blowout reducing amount corresponding to the different working conditions into the electronic control unit; the hydrogen injection reducing amount under different working conditions is the hydrogen injection reducing amount which enables the deviation between the cylinder pressure peak value of the cylinder with the hydrogen injection reducing amount and the cylinder pressure peak value of the cylinder in normal operation to be smaller than a preset threshold value.
10. The device according to claim 6, wherein the data obtaining module is specifically configured to, if a deviation between a cylinder pressure peak value of the tempered cylinder after the adjustment of the hydrogen injection amount and a cylinder pressure peak value of a cylinder in normal operation is not smaller than a preset threshold after the adjustment of the hydrogen injection amount of the tempered cylinder according to the first hydrogen injection amount reduction calibration parameter, read a second hydrogen injection amount calibration parameter corresponding to the operating condition rotation speed and the torque data after the adjustment of the hydrogen injection amount of the tempered cylinder in the electronic controller unit according to the operating condition rotation speed and the torque data after the adjustment of the hydrogen injection amount of the tempered cylinder;
the data adjusting module is specifically used for adjusting the hydrogen injection amount of the cylinder with tempering according to the second hydrogen injection amount reduction calibration parameter; and when the deviation between the cylinder pressure peak value of the cylinder with the tempering occurrence after the hydrogen injection amount is adjusted and the cylinder pressure peak value of the cylinder in normal operation is smaller than a preset threshold value, stopping adjusting the hydrogen injection amount of the cylinder with the tempering occurrence.
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