CN110594068A - Method, device and equipment for detecting fuel injection quantity and storage medium - Google Patents
Method, device and equipment for detecting fuel injection quantity and storage medium Download PDFInfo
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- CN110594068A CN110594068A CN201910886163.7A CN201910886163A CN110594068A CN 110594068 A CN110594068 A CN 110594068A CN 201910886163 A CN201910886163 A CN 201910886163A CN 110594068 A CN110594068 A CN 110594068A
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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
- F02M65/001—Measuring fuel delivery of a fuel injector
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Abstract
The embodiment of the invention provides a method, a device, equipment and a storage medium for detecting fuel injection quantity, wherein the method comprises the following steps: collecting oxygen concentration of exhaust gas and rail pressure drop when each cylinder of an engine injects fuel, wherein the engine comprises a plurality of cylinders; calculating a total fuel injection quantity of the engine in one combustion cycle according to the oxygen concentration; determining the fuel injection quantity distribution coefficient corresponding to each cylinder according to the rail pressure drop of each cylinder; and determining the fuel injection quantity of each cylinder according to the total fuel injection quantity and the fuel injection quantity distribution coefficient corresponding to each cylinder. According to the embodiment of the invention, the rail pressure drop of each cylinder is utilized to determine the fuel injection quantity distribution coefficient of each cylinder, and then the fuel injection quantity of each cylinder is accurately determined according to the fuel injection quantity distribution coefficient, so that the fuel injection quantity of each cylinder of the engine is detected.
Description
Technical Field
The embodiment of the invention relates to the technical field of engines, in particular to a method, a device, equipment and a storage medium for detecting fuel injection quantity.
Background
Engine operation is achieved by fuel being injected by a fuel injector and combusted within a cylinder. Wherein, the fuel injector sprays fuel outwards through the spray hole. As the service life of the engine increases, the spray holes of the fuel injector are abraded due to multiple injections; as wear continues, the orifices progressively enlarge. Along with the orifice grow, under the condition that the control reference volume that original operating condition set for remains unchanged, the fuel injection volume of actual production will increase, and then engine explosion pressure will exceed standard, and the power that actually produces will exceed actual demand promptly, and this has just caused the waste of the energy. In order to avoid the energy waste caused by the reason, the fuel injection quantity at the current moment needs to be corrected according to the change condition of the actual fuel injection quantity at each moment, and in order to realize the correction, the fuel injection quantity at each moment needs to be detected in real time.
In the prior art, the fuel injection quantity of an engine is calculated according to the oxygen concentration of exhaust gas by collecting the exhaust gas generated by the engine.
However, in the prior art, the fuel injection quantity of the engine is calculated through the oxygen concentration of the exhaust gas, only the total fuel injection quantity of the engine can be obtained, the fuel injection quantity of each cylinder of the engine cannot be detected, and the fuel injection quantity of each cylinder cannot be corrected.
Disclosure of Invention
The embodiment of the invention provides a method, a device, equipment and a storage medium for detecting the fuel injection quantity, which aim to solve the problem that the fuel injection quantity of each cylinder of an engine cannot be detected by the conventional fuel injection quantity detection mode.
In a first aspect, an embodiment of the present invention provides an oil injection amount detection method, including:
collecting oxygen concentration of exhaust gas and rail pressure drop when each cylinder of an engine injects fuel, wherein the engine comprises a plurality of cylinders;
calculating a total fuel injection quantity of the engine in one combustion cycle according to the oxygen concentration;
determining the fuel injection quantity distribution coefficient corresponding to each cylinder according to the rail pressure drop of each cylinder;
and determining the fuel injection quantity of each cylinder according to the total fuel injection quantity and the fuel injection quantity distribution coefficient corresponding to each cylinder.
In one possible embodiment, determining the fuel injection quantity distribution coefficient corresponding to each cylinder according to the rail pressure drop of each cylinder includes:
calculating the sum of the rail pressure drops of all the cylinders of the engine according to the rail pressure drop of each cylinder;
and for each cylinder, taking the ratio obtained by dividing the rail pressure drop of the cylinder by the sum of the rail pressure drops of all the cylinders as the fuel injection quantity distribution coefficient corresponding to the cylinder.
In a possible embodiment, determining the fuel injection quantity of each cylinder according to the total fuel injection quantity and the fuel injection quantity distribution coefficient corresponding to each cylinder includes:
and aiming at each cylinder, taking the product value of the total fuel injection quantity multiplied by the fuel injection quantity distribution coefficient corresponding to the cylinder as the fuel injection quantity of the cylinder.
In one possible embodiment, calculating a total fuel injection amount of the engine in one combustion cycle based on the oxygen concentration includes:
acquiring the total air inflow of the engine in one combustion cycle;
calculating an excess air coefficient according to the oxygen concentration;
and calculating the total fuel injection quantity according to the total air inflow and the excess air coefficient.
In one possible embodiment, calculating the total fuel injection quantity based on the total intake air quantity and the excess air factor includes:
calculating the total fuel injection quantity by adopting a first formula, wherein the first formula is as follows:
wherein, Sigma QiIs the total fuel injection quantity, QairLambda is the excess air ratio, l is the ratio of air to fuel at full fuel combustion for the total intake air quantityStoichiometric ratio.
In a possible implementation manner, after determining the fuel injection amount of each cylinder according to the total fuel injection amount and the fuel injection amount distribution coefficient corresponding to each cylinder, the method further includes:
acquiring a set oil injection quantity of each cylinder;
and calculating the difference value between the oil injection quantity of the cylinder and the set oil injection quantity of the cylinder aiming at each cylinder, and correcting the oil injection quantity of the cylinder according to the difference value.
In a possible embodiment, correcting the injection quantity of the cylinder according to the difference value includes:
and generating a control signal according to the difference value, and sending the control signal to the oil injector of the cylinder, wherein the control signal is used for indicating the oil injector of the cylinder to adjust the oil injection quantity.
In a second aspect, an embodiment of the present invention provides an oil injection amount detection apparatus, including:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the oxygen concentration of exhaust gas and the rail pressure drop when each cylinder of an engine injects fuel, and the engine comprises a plurality of cylinders;
the first processing module is used for calculating the total fuel injection quantity of the engine in one combustion cycle according to the oxygen concentration;
the second processing module is used for determining the fuel injection quantity distribution coefficient corresponding to each cylinder according to the rail pressure drop of each cylinder;
and the third processing module is used for determining the fuel injection quantity of each cylinder according to the total fuel injection quantity and the fuel injection quantity distribution coefficient corresponding to each cylinder.
In a possible implementation, the second processing module is configured to:
calculating the sum of the rail pressure drops of all the cylinders of the engine according to the rail pressure drop of each cylinder;
and for each cylinder, taking the ratio obtained by dividing the rail pressure drop of the cylinder by the sum of the rail pressure drops of all the cylinders as the fuel injection quantity distribution coefficient corresponding to the cylinder.
In a possible implementation, the third processing module is configured to:
and aiming at each cylinder, taking the product value of the total fuel injection quantity multiplied by the fuel injection quantity distribution coefficient corresponding to the cylinder as the fuel injection quantity of the cylinder.
In a possible implementation, the first processing module is configured to:
acquiring the total air inflow of the engine in one combustion cycle;
calculating an excess air coefficient according to the oxygen concentration;
and calculating the total fuel injection quantity according to the total air inflow and the excess air coefficient.
In a possible implementation, the first processing module is configured to:
calculating the total fuel injection quantity by adopting a first formula, wherein the first formula is as follows:
wherein, Sigma QiIs the total fuel injection quantity, QairLambda is the excess air factor and l is the stoichiometric ratio of air to fuel at full fuel combustion for the total intake air.
In a possible implementation, the apparatus further includes a modification module configured to:
acquiring a set oil injection quantity of each cylinder;
and calculating the difference value between the oil injection quantity of the cylinder and the set oil injection quantity of the cylinder aiming at each cylinder, and correcting the oil injection quantity of the cylinder according to the difference value.
In a possible implementation, the modification module is configured to:
and generating a control signal according to the difference value, and sending the control signal to the oil injector of the cylinder, wherein the control signal is used for indicating the oil injector of the cylinder to adjust the oil injection quantity.
In a third aspect, an embodiment of the present invention provides an oil injection amount detection apparatus, including: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executes the computer-executable instructions stored in the memory, so that the at least one processor executes the fuel injection amount detection method according to the first aspect and various possible embodiments of the first aspect.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer executing instruction is stored in the computer-readable storage medium, and when a processor executes the computer executing instruction, the method for detecting an amount of fuel injected according to the first aspect and various possible implementations of the first aspect is implemented.
According to the method, the device, the equipment and the storage medium for detecting the fuel injection quantity, the oxygen concentration of exhaust gas and the rail pressure drop of each cylinder of the engine during fuel injection are collected, wherein the engine comprises a plurality of cylinders; calculating the total fuel injection quantity of the engine in one combustion cycle according to the oxygen concentration; determining the fuel injection quantity distribution coefficient corresponding to each cylinder according to the rail pressure drop of each cylinder; the fuel injection quantity of each cylinder is determined according to the total fuel injection quantity and the fuel injection quantity distribution coefficient corresponding to each cylinder, the fuel injection quantity distribution coefficient of each cylinder can be determined by utilizing the rail pressure drop of each cylinder, and then the fuel injection quantity of each cylinder is accurately determined according to the fuel injection quantity distribution coefficient, so that the fuel injection quantity of each cylinder of the engine is detected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a fuel injection amount detection method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a fuel injection amount detection method according to another embodiment of the present invention;
fig. 3 is a schematic flow chart of a fuel injection amount detection method according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of an oil injection amount detection device according to an embodiment of the present invention;
fig. 5 is a schematic structural view of an oil injection amount detection device according to still another embodiment of the present invention;
fig. 6 is a schematic diagram of a hardware structure of the fuel injection amount detection device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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 invention.
In the prior art, the fuel injection quantity of an engine is calculated according to the oxygen concentration of exhaust gas by collecting the exhaust gas generated by the engine. However, the fuel injection amount of the engine is calculated by the oxygen concentration of the exhaust gas, only the total fuel injection amount of the engine can be obtained, the fuel injection amount of each cylinder of the engine cannot be detected, and the fuel injection amount of each cylinder cannot be corrected.
According to the embodiment of the invention, the rail pressure drop of each cylinder can be utilized to determine the fuel injection quantity distribution coefficient of each cylinder, and then the fuel injection quantity of each cylinder is accurately determined according to the fuel injection quantity distribution coefficient, so that the fuel injection quantity of each cylinder of the engine can be detected.
Fig. 1 is a schematic flow chart of a fuel injection amount detection method according to an embodiment of the present invention. As shown in fig. 1, the method includes:
s101, collecting oxygen concentration of exhaust gas and rail pressure drop when fuel is injected into each cylinder of an engine, wherein the engine comprises a plurality of cylinders.
In the present embodiment, the engine is a multi-cylinder engine, including a plurality of cylinders. The oxygen concentration in the exhaust gas may be measured by a nitrogen oxygen sensor or an oxygen sensor on the exhaust pipe. Each cylinder creates a rail pressure drop as it injects fuel. The rail pressure drop for each cylinder may be collected.
And S102, calculating the total fuel injection quantity of the engine in one combustion cycle according to the oxygen concentration.
In the present embodiment, the total fuel injection amount of the engine in one combustion cycle can be calculated based on the oxygen concentration in the exhaust gas. The total fuel injection quantity is the sum of fuel injection quantities of all cylinders of the engine.
S103, determining the fuel injection quantity distribution coefficient corresponding to each cylinder according to the rail pressure drop of each cylinder.
In the present embodiment, the fuel injection quantity distribution coefficient represents the proportion of the fuel injection quantity of each cylinder in the total fuel injection quantity of the engine. The rail pressure drop caused by oil injection is calculated according to the mass conservation law, is in direct proportion to the rail pressure and the volume of injected fuel oil, and is in inverse proportion to the volume of a common rail pipe. Under the stable working condition, the rail pressure and the volume of the common rail pipe in the same combustion cycle are consistent, the rail pressure drop of each cylinder is in direct proportion to the volume quantity of the injected fuel, the fuel density is the same, and the rail pressure drop of each cylinder is in direct proportion to the quality of the injected fuel. Therefore, the fuel injection quantity distribution coefficient corresponding to each cylinder can be determined according to the rail pressure drop of each cylinder.
Alternatively, S103 may include:
calculating the sum of the rail pressure drops of all the cylinders of the engine according to the rail pressure drop of each cylinder;
and for each cylinder, taking the ratio obtained by dividing the rail pressure drop of the cylinder by the sum of the rail pressure drops of all the cylinders as the fuel injection quantity distribution coefficient corresponding to the cylinder.
In this embodiment, the rail pressure drops of the individual cylinders may be summed and the sum of the rail pressure drops of all cylinders of the engine may be calculated. And then dividing the rail pressure drop of each cylinder by the sum of the rail pressure drops of all the cylinders to obtain a ratio which is used as a fuel injection quantity distribution coefficient corresponding to each cylinder.
And S104, determining the fuel injection quantity of each cylinder according to the total fuel injection quantity and the fuel injection quantity distribution coefficient corresponding to each cylinder.
In this embodiment, since the distribution coefficient of the fuel injection amount represents the proportion of the fuel injection amount of the cylinder in the total fuel injection amount of the engine, the fuel injection amount of each cylinder can be respectively calculated according to the total fuel injection amount and the distribution coefficient of the fuel injection amount corresponding to each cylinder, so that the actual fuel injection amount of each cylinder can be corrected according to the fuel injection amount of each cylinder and the set fuel injection amount in the following process.
According to the embodiment of the invention, the oxygen concentration of waste gas and the rail pressure drop of each cylinder of the engine during fuel injection are collected, wherein the engine comprises a plurality of cylinders; calculating the total fuel injection quantity of the engine in one combustion cycle according to the oxygen concentration; determining the fuel injection quantity distribution coefficient corresponding to each cylinder according to the rail pressure drop of each cylinder; the fuel injection quantity of each cylinder is determined according to the total fuel injection quantity and the fuel injection quantity distribution coefficient corresponding to each cylinder, the fuel injection quantity distribution coefficient of each cylinder can be determined by utilizing the rail pressure drop caused by the fuel injection process of each cylinder, and then the fuel injection quantity of each cylinder is accurately determined according to the fuel injection quantity distribution coefficient, so that the fuel injection quantity of each cylinder of the engine is detected.
Optionally, S104 may include:
and aiming at each cylinder, taking the product value of the total fuel injection quantity multiplied by the fuel injection quantity distribution coefficient corresponding to the cylinder as the fuel injection quantity of the cylinder.
In this embodiment, the total fuel injection quantity is multiplied by the fuel injection quantity distribution coefficient corresponding to each cylinder, so as to obtain the fuel injection quantity of each cylinder.
For example, the rail pressure drop for each cylinder is proportional to the mass of injected fuel, which may be expressed as Qi＝kΔPiWherein Q isiActual fuel injection quality, Δ P, for the i-th cylinderiK is the calculated coefficient for the rail pressure drop of the i-th cylinder. Since the calculation coefficients are the same for each cylinder, Σ Qi＝k∑ΔPi. Further, the method can be used for preparing a novel materialCan be derived to obtainThe fuel injection quantity of the ith cylinder can be calculated according to the formula. Wherein the content of the first and second substances,distributing coefficient, sigma delta P, to the fuel injection quantity of the i-th cylinderiWhich is the sum of the rail pressure drops of all the cylinders of the engine.
Fig. 2 is a schematic flow chart of a fuel injection amount detection method according to another embodiment of the present invention. The present embodiment describes in detail the specific implementation of calculating the total fuel injection amount of the engine in one combustion cycle based on the oxygen concentration. As shown in fig. 2, the method includes:
s201, collecting oxygen concentration of exhaust gas and rail pressure drop when fuel is injected into each cylinder of an engine, wherein the engine comprises a plurality of cylinders.
In this embodiment, S201 is similar to S101 in the embodiment of fig. 1, and is not described here again.
And S202, acquiring the total air inflow of the engine in one combustion cycle.
In the present embodiment, the intake mass may be calculated from the intake temperature and pressure measured by an intake pressure and temperature sensor in the intake pipe of the engine, in combination with an ideal gas state equation PV — mRT. Where P is gas pressure, V is gas volume, m represents gas mass, R is an ideal gas constant, and T is gas temperature.
And S203, calculating the excess air coefficient according to the oxygen concentration.
In this embodiment, the formula can be based onCalculating an excess air ratio, wherein lambda is the excess air ratio,is the oxygen concentration in the exhaust gas.
And S204, calculating the total fuel injection quantity according to the total air intake quantity and the excess air coefficient.
In the present embodiment, the total fuel injection amount of the engine is calculated based on the total intake air amount of the engine and the previously calculated excess air ratio.
Optionally, S204 may include:
calculating the total fuel injection quantity by adopting a first formula, wherein the first formula is as follows:
wherein, Sigma QiIs the total fuel injection quantity, QairLambda is the excess air factor and l is the stoichiometric ratio of air to fuel at full fuel combustion for the total intake air.
S205, determining the fuel injection quantity distribution coefficient corresponding to each cylinder according to the rail pressure drop of each cylinder.
In this embodiment, S205 is similar to S103 in the embodiment of fig. 1, and is not described here again.
And S206, determining the fuel injection quantity of each cylinder according to the total fuel injection quantity and the fuel injection quantity distribution coefficient corresponding to each cylinder.
In this embodiment, S206 is similar to S104 in the embodiment of fig. 1, and is not described here again.
According to the embodiment, the excess air coefficient is calculated through the oxygen concentration, then the total fuel injection quantity of the engine can be accurately obtained through the excess air coefficient and the total air inflow of the engine, and the accuracy of the fuel injection quantity of each cylinder is further improved.
Fig. 3 is a schematic flow chart of a fuel injection amount detection method according to another embodiment of the present invention. In this embodiment, the injection amount of each cylinder is adjusted after the injection amount of each cylinder is determined. As shown in fig. 3, the method includes:
s301, collecting oxygen concentration of exhaust gas and rail pressure drop when fuel is injected into each cylinder of an engine, wherein the engine comprises a plurality of cylinders.
In this embodiment, S301 is similar to S101 in the embodiment of fig. 1, and is not described here again.
And S302, calculating the total fuel injection quantity of the engine in one combustion cycle according to the oxygen concentration.
In this embodiment, S302 is similar to S102 in the embodiment of fig. 1, and is not described here again.
And S303, determining the fuel injection quantity distribution coefficient corresponding to each cylinder according to the rail pressure drop of each cylinder.
In this embodiment, S303 is similar to S103 in the embodiment of fig. 1, and is not described here again.
S304, determining the fuel injection quantity of each cylinder according to the total fuel injection quantity and the fuel injection quantity distribution coefficient corresponding to each cylinder.
In this embodiment, S304 is similar to S104 in the embodiment of fig. 1, and is not described here again.
And S305, acquiring the set fuel injection quantity of each cylinder.
S306, calculating the difference value between the oil injection quantity of the cylinder and the set oil injection quantity of the cylinder aiming at each cylinder, and correcting the oil injection quantity of the cylinder according to the difference value.
In the present embodiment, each cylinder corresponds to a set fuel injection amount. If the actual fuel injection quantity of a certain cylinder is the same as the set fuel injection quantity, the fuel injection quantity of the cylinder is not corrected; if the actual fuel injection quantity of a certain cylinder is the same as the set fuel injection quantity, the fuel injection quantity of the cylinder is corrected. For each cylinder, the difference between the fuel injection quantity of the cylinder and the set fuel injection quantity of the cylinder can be calculated, and the fuel injection quantity of the cylinder is corrected according to the difference. If the difference value indicates that the current actual oil injection quantity of the cylinder is larger than the set oil injection quantity of the cylinder, the oil injection quantity of the cylinder is reduced; if the difference value indicates that the current actual oil injection quantity of the cylinder is smaller than the set oil injection quantity of the cylinder, the oil injection quantity of the cylinder is increased.
Optionally, in S306, correcting the fuel injection amount of the cylinder according to the difference value may include:
and generating a control signal according to the difference value, and sending the control signal to the oil injector of the cylinder, wherein the control signal is used for indicating the oil injector of the cylinder to adjust the oil injection quantity.
In this embodiment, for each cylinder, a corresponding control signal may be generated according to a difference between an oil injection amount of the cylinder and a set oil injection amount of the cylinder, and then the control signal is sent to an injector of the cylinder, and the injector of the cylinder is controlled by the control signal to adjust the oil injection amount.
According to the embodiment, the fuel injection quantity correction and the fuel injection quantity monitoring of each cylinder can be realized by comparing the fuel injection quantity of each cylinder with the set fuel injection quantity.
Alternatively, a start condition for monitoring the fuel injection amount may be set, and the fuel injection amount may be monitored if the start condition is satisfied. For example, the monitoring is started when conditions such as the engine speed and the engine speed change within a certain range, the fuel injection amount and the fuel injection amount change within a certain range and the fuel injection amount change are maintained for a certain period of time, and other air temperature and air pressure conditions are satisfied.
The total actual fuel injection quantity of one combustion cycle is monitored accurately based on the oxygen concentration, and the single-cylinder actual fuel injection quantity cannot be monitored. The embodiment of the invention combines a rail pressure drop method to obtain the distribution coefficient of the fuel injection quantity of each cylinder, and then calculates the actual fuel injection quantity of each cylinder, and the monitoring accuracy of the fuel injection quantity of each cylinder is higher because the accuracy of monitoring the actual fuel injection quantity by inheriting the oxygen concentration. The actual fuel injection quantity of each cylinder of the engine is monitored, fuel injection correction can be performed after the deviation between the actual fuel injection quantity and the set fuel injection quantity is monitored, accurate closed-loop control of the fuel injection quantity is achieved, the fuel injection quantity is controlled accurately, emission and torque can be consistent with a development state, and reliability is improved.
Fig. 4 is a schematic structural diagram of an oil injection amount detection device according to an embodiment of the present invention. As shown in fig. 4, the fuel injection amount detection device 40 includes: an acquisition module 401, a first processing module 402, a second processing module 403, and a third processing module 404.
The system includes a collection module 401 for collecting an oxygen concentration of an exhaust gas and a rail pressure drop when each cylinder of an engine injects fuel, wherein the engine includes a plurality of cylinders.
A first processing module 402 is configured to calculate a total fuel injection amount of the engine during a combustion cycle based on the oxygen concentration.
And the second processing module 403 is configured to determine an oil injection distribution coefficient corresponding to each cylinder according to the rail pressure drop of each cylinder.
And a third processing module 404, configured to determine an oil injection amount of each cylinder according to the total oil injection amount and an oil injection amount distribution coefficient corresponding to each cylinder.
According to the embodiment of the invention, the oxygen concentration of waste gas and the rail pressure drop of each cylinder of the engine during fuel injection are collected through the collection module, wherein the engine comprises a plurality of cylinders; the first processing module calculates the total fuel injection quantity of the engine in a combustion cycle according to the oxygen concentration; the second processing module determines the fuel injection quantity distribution coefficient corresponding to each cylinder according to the rail pressure drop of each cylinder; the third processing module determines the fuel injection quantity of each cylinder according to the total fuel injection quantity and the fuel injection quantity distribution coefficient corresponding to each cylinder, and can determine the fuel injection quantity distribution coefficient of each cylinder by utilizing the rail pressure drop of each cylinder, and then accurately determine the fuel injection quantity of each cylinder according to the fuel injection quantity distribution coefficient, so that the fuel injection quantity of each cylinder of the engine is detected.
Fig. 5 is a schematic structural view of an oil injection amount detection device according to still another embodiment of the present invention. As shown in fig. 5, the fuel injection amount detection device 40 provided in this embodiment may further include, on the basis of the fuel injection amount detection device provided in the embodiment shown in fig. 4: and a correction module 405.
Optionally, the second processing module 403 is configured to:
calculating the sum of the rail pressure drops of all the cylinders of the engine according to the rail pressure drop of each cylinder;
and for each cylinder, taking the ratio obtained by dividing the rail pressure drop of the cylinder by the sum of the rail pressure drops of all the cylinders as the fuel injection quantity distribution coefficient corresponding to the cylinder.
Optionally, the third processing module 404 is configured to:
and aiming at each cylinder, taking the product value of the total fuel injection quantity multiplied by the fuel injection quantity distribution coefficient corresponding to the cylinder as the fuel injection quantity of the cylinder.
Optionally, the first processing module 402 is configured to:
acquiring the total air inflow of the engine in one combustion cycle;
calculating an excess air coefficient according to the oxygen concentration;
and calculating the total fuel injection quantity according to the total air inflow and the excess air coefficient.
Optionally, the first processing module 402 is configured to:
calculating the total fuel injection quantity by adopting a first formula, wherein the first formula is as follows:
wherein, Sigma QiIs the total fuel injection quantity, QairLambda is the excess air factor and l is the stoichiometric ratio of air to fuel at full fuel combustion for the total intake air.
Optionally, the modification module 405 is configured to:
acquiring a set oil injection quantity of each cylinder;
and calculating the difference value between the oil injection quantity of the cylinder and the set oil injection quantity of the cylinder aiming at each cylinder, and correcting the oil injection quantity of the cylinder according to the difference value.
Optionally, the modification module 405 is configured to:
and generating a control signal according to the difference value, and sending the control signal to the oil injector of the cylinder, wherein the control signal is used for indicating the oil injector of the cylinder to adjust the oil injection quantity.
The device for detecting the fuel injection quantity provided by the embodiment of the invention can be used for executing the method embodiment, the implementation principle and the technical effect are similar, and the detailed description is omitted here.
Fig. 6 is a schematic diagram of a hardware structure of the fuel injection amount detection device according to an embodiment of the present invention. As shown in fig. 6, the fuel injection amount detection apparatus 60 according to the present embodiment includes: at least one processor 601 and memory 602. The fuel injection amount detection apparatus 60 further includes a communication section 603. The processor 601, the memory 602, and the communication section 603 are connected by a bus 604.
In a specific implementation process, the at least one processor 601 executes the computer-executable instructions stored in the memory 602, so that the at least one processor 601 executes the fuel injection amount detection method.
For a specific implementation process of the processor 601, reference may be made to the above method embodiments, which implement the principle and the technical effect similarly, and details of this embodiment are not described herein again.
In the embodiment shown in fig. 6, it should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.
The memory may comprise high speed RAM memory and may also include non-volatile storage NVM, such as at least one disk memory.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
The application also provides a computer-readable storage medium, wherein a computer executing instruction is stored in the computer-readable storage medium, and when a processor executes the computer executing instruction, the above fuel injection amount detection method is realized.
The computer-readable storage medium may be implemented by any type of volatile or non-volatile memory device or combination thereof, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk. Readable storage media can be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary readable storage medium is coupled to the processor such the processor can read information from, and write information to, the readable storage medium. Of course, the readable storage medium may also be an integral part of the processor. The processor and the readable storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the readable storage medium may also reside as discrete components in the apparatus.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (16)
1. A fuel injection amount detection method characterized by comprising:
collecting oxygen concentration of exhaust gas and rail pressure drop when each cylinder of an engine injects fuel, wherein the engine comprises a plurality of cylinders;
calculating a total fuel injection quantity of the engine in one combustion cycle according to the oxygen concentration;
determining the fuel injection quantity distribution coefficient corresponding to each cylinder according to the rail pressure drop of each cylinder;
and determining the fuel injection quantity of each cylinder according to the total fuel injection quantity and the fuel injection quantity distribution coefficient corresponding to each cylinder.
2. The method of claim 1, wherein determining the fuel injection distribution coefficient for each cylinder based on the rail pressure drop for each cylinder comprises:
calculating the sum of the rail pressure drops of all the cylinders of the engine according to the rail pressure drop of each cylinder;
and for each cylinder, taking the ratio obtained by dividing the rail pressure drop of the cylinder by the sum of the rail pressure drops of all the cylinders as the fuel injection quantity distribution coefficient corresponding to the cylinder.
3. The method of claim 1, wherein determining the fuel injection quantity for each cylinder based on the total fuel injection quantity and the fuel injection quantity distribution coefficient for each cylinder comprises:
and aiming at each cylinder, taking the product value of the total fuel injection quantity multiplied by the fuel injection quantity distribution coefficient corresponding to the cylinder as the fuel injection quantity of the cylinder.
4. The method of claim 1, wherein calculating a total fuel injection amount for the engine over a combustion cycle based on the oxygen concentration comprises:
acquiring the total air inflow of the engine in one combustion cycle;
calculating an excess air coefficient according to the oxygen concentration;
and calculating the total fuel injection quantity according to the total air inflow and the excess air coefficient.
5. The method of claim 4, wherein calculating the total injected fuel quantity based on the total intake air quantity and the excess air factor comprises:
calculating the total fuel injection quantity by adopting a first formula, wherein the first formula is as follows:
wherein, Sigma QiIs the total fuel injection quantity, QairLambda is the excess air factor and l is the stoichiometric ratio of air to fuel at full fuel combustion for the total intake air.
6. The method of any of claims 1-5, wherein after determining the fuel injection for each cylinder based on the total fuel injection and the fuel injection distribution coefficient for each cylinder, further comprising:
acquiring a set oil injection quantity of each cylinder;
and calculating the difference value between the oil injection quantity of the cylinder and the set oil injection quantity of the cylinder aiming at each cylinder, and correcting the oil injection quantity of the cylinder according to the difference value.
7. The method of claim 6, wherein modifying the injection amount for the cylinder based on the difference comprises:
and generating a control signal according to the difference value, and sending the control signal to the oil injector of the cylinder, wherein the control signal is used for indicating the oil injector of the cylinder to adjust the oil injection quantity.
8. An injection quantity detection device, characterized by comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the oxygen concentration of exhaust gas and the rail pressure drop when each cylinder of an engine injects fuel, and the engine comprises a plurality of cylinders;
the first processing module is used for calculating the total fuel injection quantity of the engine in one combustion cycle according to the oxygen concentration;
the second processing module is used for determining the fuel injection quantity distribution coefficient corresponding to each cylinder according to the rail pressure drop of each cylinder;
and the third processing module is used for determining the fuel injection quantity of each cylinder according to the total fuel injection quantity and the fuel injection quantity distribution coefficient corresponding to each cylinder.
9. The apparatus of claim 8, wherein the second processing module is configured to:
calculating the sum of the rail pressure drops of all the cylinders of the engine according to the rail pressure drop of each cylinder;
and for each cylinder, taking the ratio obtained by dividing the rail pressure drop of the cylinder by the sum of the rail pressure drops of all the cylinders as the fuel injection quantity distribution coefficient corresponding to the cylinder.
10. The apparatus of claim 8, wherein the third processing module is configured to:
and aiming at each cylinder, taking the product value of the total fuel injection quantity multiplied by the fuel injection quantity distribution coefficient corresponding to the cylinder as the fuel injection quantity of the cylinder.
11. The apparatus of claim 8, wherein the first processing module is configured to:
acquiring the total air inflow of the engine in one combustion cycle;
calculating an excess air coefficient according to the oxygen concentration;
and calculating the total fuel injection quantity according to the total air inflow and the excess air coefficient.
12. The apparatus of claim 11, wherein the first processing module is configured to:
calculating the total fuel injection quantity by adopting a first formula, wherein the first formula is as follows:
wherein, Sigma QiIs the total fuel injection quantity, QairLambda is the excess air factor and l is the stoichiometric ratio of air to fuel at full fuel combustion for the total intake air.
13. The apparatus according to any one of claims 8-12, further comprising a modification module configured to:
acquiring a set oil injection quantity of each cylinder;
and calculating the difference value between the oil injection quantity of the cylinder and the set oil injection quantity of the cylinder aiming at each cylinder, and correcting the oil injection quantity of the cylinder according to the difference value.
14. The apparatus of claim 13, wherein the modification module is configured to:
and generating a control signal according to the difference value, and sending the control signal to the oil injector of the cylinder, wherein the control signal is used for indicating the oil injector of the cylinder to adjust the oil injection quantity.
15. An injection quantity detection apparatus characterized by comprising: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executes the computer-executable instructions stored in the memory to cause the at least one processor to perform the fuel injection amount detection method of any of claims 1-7.
16. A computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the method for detecting fuel injection amount according to any one of claims 1 to 7 is implemented.
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| CN111075584A (en) * | 2019-12-31 | 2020-04-28 | 潍柴动力股份有限公司 | Method and device for determining air inflow of engine, storage medium and electronic equipment |
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