CN111140403B - Flow compensation method, device and equipment of gas injection valve - Google Patents
Flow compensation method, device and equipment of gas injection valve Download PDFInfo
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- CN111140403B CN111140403B CN201911396190.2A CN201911396190A CN111140403B CN 111140403 B CN111140403 B CN 111140403B CN 201911396190 A CN201911396190 A CN 201911396190A CN 111140403 B CN111140403 B CN 111140403B
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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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0257—Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages
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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
- F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention provides a flow compensation method, a device and equipment of a fuel gas injection valve. The method comprises the steps of obtaining a current first inlet pressure value and a current first outlet pressure value of the gas injection valve; determining whether the gas injection valve works in a subsonic speed region or not according to the first inlet pressure value and the first outlet pressure value; if the gas injection valve works in a subsonic speed region, determining a first power-up time coefficient corresponding to the first inlet pressure value and the first outlet pressure value according to the corresponding relation among the inlet pressure value, the outlet pressure value and the power-up time coefficient when the gas injection valve works in the subsonic speed region; determining a first power-on time of the gas injection valve according to the first power-on time coefficient; and controlling the gas injection valve to inject gas according to the first power-on time. The method realizes the stable work of the gas injection valve in the subsonic region, and improves the stability of the torque output and the rotating speed of the gas engine.
Description
Technical Field
The invention relates to the technology of gas engines, in particular to a flow compensation method, a device and equipment of a gas injection valve.
Background
The gas injection valve is a device that controls fuel injection in a gas engine, and the flow rate of the gas injection valve determines the rotational speed and torque output of the engine.
In practical application, due to various reasons such as low gas quantity of a gas tank, improper type selection of a pressure reducing valve, poor pressure stabilizing precision or too thin and too long pipe diameter in gas pipeline arrangement, the inlet pressure of a gas injection valve, namely gas rail pressure fluctuation, is large under a large load or transient working condition, so that the gas injection valve works in a subsonic region.
When the gas injection valve works in a subsonic region, namely the gas flow speed is lower than the sonic speed, the flow of the gas injection valve is seriously reduced, so that enough fuel cannot be injected in the power-up time of the gas injection valve, the rotating speed of an engine is unstable, and the torque cannot be improved. Therefore, there is a need to provide a method for compensating for the flow rate of a gas injection valve operating in the subsonic region.
Disclosure of Invention
The invention provides a flow compensation method, a flow compensation device and flow compensation equipment of a gas injection valve, which realize the stable work of the gas injection valve in a subsonic region and improve the stability of torque output and rotating speed of a gas engine.
In a first aspect, the present invention provides a flow compensation method for a gas injection valve, including:
acquiring a current first inlet pressure value and a current first outlet pressure value of the gas injection valve;
determining whether the gas injection valve works in a subsonic speed region or not according to the first inlet pressure value and the first outlet pressure value;
if the gas injection valve works in a subsonic speed region, determining a first power-up time coefficient corresponding to the first inlet pressure value and the first outlet pressure value according to the corresponding relation among the inlet pressure value, the outlet pressure value and the power-up time coefficient when the gas injection valve works in the subsonic speed region;
determining a first power-on time of the gas injection valve according to the first power-on time coefficient;
and controlling the gas injection valve to inject gas according to the first power-up time.
Optionally, before obtaining the current first inlet pressure value and the current first outlet pressure value of the gas injection valve, the method further includes:
and acquiring the corresponding relation among an inlet pressure value, an outlet pressure value and an electrification time coefficient when the gas injection valve works at a subsonic speed zone.
Optionally, the obtaining of the corresponding relationship between the inlet pressure value, the outlet pressure value and the power-up time coefficient when the gas injection valve operates at the subsonic region includes:
acquiring M actual flow values of the gas injection valve under M second inlet pressure values and N second outlet pressure values, and determining P actual flow values of the M actual flow values when the gas injection valve works in a subsonic velocity region, and P pairs of second inlet pressure values and second outlet pressure values corresponding to the P actual flow values;
determining P power-on time coefficients of the gas injection valve under the P pairs of second inlet pressure values and second outlet pressure values according to the P actual flow values;
and determining the corresponding relation between the inlet pressure value and the outlet pressure value of the gas injection valve working at the subsonic speed zone and the power-on time coefficient according to the P power-on time coefficients and the P pairs of second inlet pressure values and second outlet pressure values.
Optionally, each of the P actual flow values and the corresponding power-up time coefficient satisfy the following formula:
wherein KRAGTE is a power-on time coefficient; rho _0_ L is the standard air density; vh _ zyl is the single cylinder stroke volume; 100 in%; l _ st is an air-fuel ratio; the Normmk is a unit conversion coefficient; qstat is the actual flow value.
Optionally, the determining, according to the P power-up time coefficients and the P pairs of second inlet pressure values and second outlet pressure values, a corresponding relationship between the inlet pressure values and the outlet pressure values of the gas injection valve operating at the subsonic region and the power-up time coefficients includes:
and performing linear interpolation on the power-on time coefficient of the gas injection valve working in the subsonic speed region according to the P power-on time coefficients and the P pair of second inlet pressure values and second outlet pressure values to obtain the corresponding relation between the inlet pressure values and the outlet pressure values of the gas injection valve working in the subsonic speed region and the power-on time coefficients.
Optionally, the determining a first power-up time of the gas injection valve according to the first power-up time coefficient includes:
and multiplying the charging amount of the gas engine with the gas injection valve by the first power-on time coefficient to obtain the first power-on time of the gas injection valve.
Optionally, the method further includes:
if the gas injection valve works in the supersonic speed area, determining a second power-on time coefficient corresponding to the first inlet pressure value according to the corresponding relation between the inlet pressure value and the power-on time coefficient when the gas injection valve works in the supersonic speed area;
determining a second power-on time of the gas injection valve according to the second power-on time coefficient;
and controlling the gas injection valve to inject gas according to the second power-up time.
In a second aspect, the present invention provides a flow rate compensation device for a gas injection valve, comprising:
the acquisition module is used for acquiring a current first inlet pressure value and a current first outlet pressure value of the gas injection valve;
the judging module is used for determining whether the gas injection valve works in a subsonic speed region or not according to the first inlet pressure value and the first outlet pressure value;
the first determining module is used for determining a first power-on time coefficient corresponding to the first inlet pressure value and the first outlet pressure value according to the corresponding relation among the inlet pressure value, the outlet pressure value and the power-on time coefficient when the gas injection valve works in a subsonic speed area;
the second determination module is used for determining the first power-on time of the gas injection valve according to the first power-on time coefficient;
and the control module is used for controlling the gas injection valve to inject gas according to the first power-on time.
Optionally, the obtaining module is further configured to:
and acquiring the corresponding relation among an inlet pressure value, an outlet pressure value and an electrification time coefficient when the gas injection valve works at a subsonic speed zone.
Optionally, the obtaining module is specifically configured to:
acquiring M actual flow values of the gas injection valve under M second inlet pressure values and N second outlet pressure values, and determining P actual flow values of the M actual flow values when the gas injection valve works in a subsonic velocity region, and P pairs of second inlet pressure values and second outlet pressure values corresponding to the P actual flow values;
determining P power-on time coefficients of the gas injection valve under the P pairs of second inlet pressure values and second outlet pressure values according to the P actual flow values;
and determining the corresponding relation between the inlet pressure value and the outlet pressure value of the gas injection valve working at the subsonic speed zone and the power-on time coefficient according to the P power-on time coefficients and the P pairs of second inlet pressure values and second outlet pressure values.
Optionally, each of the P actual flow values and the corresponding power-up time coefficient satisfy the following formula:
wherein KRAGTE is a power-on time coefficient; rho _0_ L is the standard air density; vh _ zyl is the single cylinder stroke volume; 100 in%; l _ st is an air-fuel ratio; the Normmk is a unit conversion coefficient; qstat is the actual flow value.
Optionally, the obtaining module is specifically configured to:
and performing linear interpolation on the power-on time coefficient of the gas injection valve working in the subsonic speed region according to the P power-on time coefficients and the P pair of second inlet pressure values and second outlet pressure values to obtain the corresponding relation between the inlet pressure values and the outlet pressure values of the gas injection valve working in the subsonic speed region and the power-on time coefficients.
Optionally, the second determining module is configured to:
and multiplying the charging amount of the gas engine with the gas injection valve by the first power-on time coefficient to obtain the first power-on time of the gas injection valve.
Optionally, the first determining module is further configured to:
if the gas injection valve works in the supersonic speed area, determining a second power-on time coefficient corresponding to the first inlet pressure value according to the corresponding relation between the inlet pressure value and the power-on time coefficient when the gas injection valve works in the supersonic speed area;
correspondingly, the second determining module is further used for determining a second power-on time of the gas injection valve according to the second power-on time coefficient;
and the control module is also used for controlling the gas injection valve to inject gas according to the second power-on time.
In a third aspect, the present invention provides a flow rate compensation apparatus of a gas injection valve, comprising: a memory and a processor; the memory is connected with the processor;
the memory for storing a computer program;
the processor is configured to implement the flow compensation method of the gas injection valve according to any one of the first aspect.
In a fourth aspect, the present invention provides a storage medium having stored thereon a computer program which, when executed by a processor, implements a method of flow compensation for a gas injection valve as defined in any one of the above first aspects.
The invention provides a flow compensation method, a device and equipment of a gas injection valve, wherein the current first inlet pressure value and the current first outlet pressure value of the gas injection valve are obtained; determining whether the gas injection valve works in a subsonic speed region or not according to the first inlet pressure value and the first outlet pressure value; if the gas injection valve works in a subsonic speed region, determining a first power-up time coefficient corresponding to the first inlet pressure value and the first outlet pressure value according to the corresponding relation among the inlet pressure value, the outlet pressure value and the power-up time coefficient when the gas injection valve works in the subsonic speed region; determining a first power-on time of the gas injection valve according to the first power-on time coefficient; and controlling the gas injection valve to inject gas according to the first power-on time. The method corrects the power-on time of the gas injection valve according to the power-on time coefficient of the gas injection valve working in the subsonic region, so that the gas injection valve injects and outputs the required gas injection quantity, the flow of the gas injection valve meets the design requirement under low inlet pressure and high outlet pressure, the whole-region coverage of the gas injection valve working is realized, and the stability of a gas engine at a high-power point is ensured. In addition, the pressure stability and the precision requirement on the gas reducing valve are reduced, the gas reducing valve can be applied to a low-pressure environment, and the use cost is reduced.
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 flow chart of a gas injection valve;
FIG. 2 is a first schematic flow chart of a flow compensation method for a gas injection valve according to the present invention;
FIG. 3 is a second schematic flow chart of a flow compensation method for a gas injection valve according to the present invention;
FIG. 4 is a three-dimensional data calibration diagram of a gas injection valve according to the present invention;
FIG. 5 is a schematic structural diagram of a flow compensation device of a gas injection valve according to the present invention;
fig. 6 is a schematic structural diagram of a flow compensation device of a gas injection valve according to 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.
The flow rate of a gas injection valve of a gas engine is determined by its inlet pressure P1, i.e. the rail pressure, and its outlet pressure P2, i.e. the engine intake manifold pressure. When the gas injection valve works in the supersonic speed region, namely the gas flow speed is higher than the sonic speed, the flow of the gas injection valve is only related to the inlet pressure P1; when the gas injection valve operates in the subsonic region, i.e. the gas flow rate is slower than the sonic speed, the gas injection valve flow rate is related to both the inlet pressure P1 and the outlet pressure P2. Fig. 1 is a flow chart of a gas injection valve. Fig. 1 illustrates the flow curve for a gas injection valve with an inlet pressure P1 of 450kPa and an outlet pressure P2 varying between 0 and 350 kPa. As shown in FIG. 1, the gas injection valve operates in the supersonic region in the range of 0 to 237kPa at the left side of the dotted line P2 in the figure, and operates in the subsonic region in the range of 237 to 350kPa at the right side of the dotted line P2 in the figure. Obviously, when the gas injection valve works in a subsonic region, the flow rate of the gas injection valve is seriously reduced, so that enough fuel cannot be injected in the power-up time of the gas injection valve, the rotating speed of an engine is unstable, and the torque cannot be increased.
In order to enable the gas injection valve to inject sufficient fuel when the flow rate of the gas injection valve is decreased, it is necessary to extend the energization time of the gas injection valve, that is, to extend the gas injection time to compensate for the decrease in the flow rate. How to accurately correct the power-on time of the gas injection valve is a problem to be solved. In order to solve the above problems, the present invention provides a flow compensation method for a gas injection valve, which accurately corrects the power-on time of the gas injection valve by determining the deviation of the actual flow value of the gas injection valve in the subsonic region under different inlet and outlet pressures, so that the gas injection valve outputs the required gas injection amount. The method provided by the invention is illustrated below with reference to specific embodiments.
Fig. 2 is a first schematic flow chart of a flow compensation method of a gas injection valve according to the present invention. The main implementation of the method is a flow compensation device of a gas injection valve, which may be implemented in software and/or hardware, for example, the device may be an Electronic Control Unit (ECU) of a vehicle in which the gas engine is located. The method comprises the following steps:
s201, obtaining a current first inlet pressure value and a current first outlet pressure value of the gas injection valve.
S202, determining whether the gas injection valve works in a subsonic speed region or not according to the first inlet pressure value and the first outlet pressure value.
The first inlet pressure value and the first outlet pressure value of the gas injection valve may be detected by a pressure sensor, and the type and the detection method of the pressure sensor are not particularly limited in this embodiment. The ECU can control the pressure sensor to detect and obtain a current first inlet pressure value and a current first outlet pressure value of the gas injection valve, and further determine whether the gas injection valve works in a subsonic region according to a ratio of the first outlet pressure value to the first inlet pressure value. For example, if the ratio of the first outlet pressure value to the first inlet pressure value is less than 0.528, it is determined that the gas injection valve is operating in the supersonic region; and if the ratio of the first outlet pressure value to the first inlet pressure value is greater than or equal to 0.528 and less than 1, determining that the gas injection valve works in a subsonic region.
S203, if the gas injection valve works in a subsonic speed region, determining a first power-up time coefficient corresponding to the first inlet pressure value and the first outlet pressure value according to the corresponding relation between the inlet pressure value, the outlet pressure value and the power-up time coefficient when the gas injection valve works in the subsonic speed region.
In this step, the correspondence between the inlet pressure value and the outlet pressure value of the gas injection valve operating at the subsonic region and the energization time coefficient may be stored in advance in the ECU. The corresponding relation comprises a plurality of power-on time coefficients corresponding to a plurality of pairs of different inlet pressures and outlet pressures of the gas injection valve working in a subsonic region, and each pair of inlet pressure and outlet pressure corresponds to one power-on time coefficient. The correspondence relationship may be obtained by testing beforehand the flow rates of the gas injection valves operating at different inlet pressures and outlet pressures in the subsonic region. Illustratively, an inlet pressure of 350kPa and an outlet pressure of 250kPa, corresponding to a power-up time factor of 0.590858; an inlet pressure of 350kPa and an outlet pressure of 280kPa, corresponding to a power-up time factor of 0.718878; inlet pressure 400kPa and outlet pressure 225kPa, corresponding to a power-up time factor of 0.435683.
When the current first inlet pressure and the current first outlet pressure of the gas injection valve are obtained in the above steps, the first energization time coefficient corresponding to the first inlet pressure and the first outlet pressure can be determined according to the corresponding relationship, for example, if the first inlet pressure is 350kPa and the first outlet pressure is 250kPa, the corresponding first energization time coefficient is 0.590858.
And S204, determining the first power-on time of the gas injection valve according to the first power-on time coefficient.
When the gas injection valve works in the subsonic region, the flow rate of the gas injection valve is reduced in different degrees when the gas injection valve works in different inlet pressure values and outlet pressure values of the subsonic region, therefore, when the gas injection valve works in the subsonic region, first power-up time is calculated according to a first power-up time coefficient corresponding to a current first inlet pressure value and a current first outlet pressure value to compensate the flow rate, and the first power-up time of the gas injection valve is obtained by multiplying the charging amount of a gas engine where the gas injection valve is located by the first power-up time coefficient.
And S205, controlling the gas injection valve to inject gas according to the first compensation power-on time.
And controlling the gas injection valve to inject gas according to the first power-up time, so that the gas quantity injected by the gas injection valve reaches a preset gas quantity. The duration of the first power-on time is longer than the power-on time for injecting the preset gas quantity when the gas injection valve operates at the supersonic speed area under the first inlet pressure value.
According to the flow compensation method of the gas injection valve provided by the embodiment, the current first inlet pressure value and the current first outlet pressure value of the gas injection valve are obtained; determining whether the gas injection valve works in a subsonic speed region or not according to the first inlet pressure value and the first outlet pressure value; if the gas injection valve works in a subsonic speed region, determining a first power-up time coefficient corresponding to the first inlet pressure value and the first outlet pressure value according to the corresponding relation between the inlet pressure value and the outlet pressure value of the gas injection valve and the power-up time coefficient when the gas injection valve works in the subsonic speed region; determining a first power-on time of the gas injection valve according to the first power-on time coefficient; and controlling the gas injection valve to inject gas according to the first power-on time. The method corrects the power-on time of the gas injection valve according to the power-on time coefficient when the gas injection valve works in a subsonic region, so that the fuel gas injection valve injects and outputs fuel gas quantity reaching the required fuel gas quantity, the flow of the gas injection valve meets the design requirement under low inlet pressure and high outlet pressure, the whole-region coverage of the work of the gas injection valve is realized, and the stability of a gas engine at a high-power point is ensured. In addition, the pressure stability and the precision requirement on the gas reducing valve are reduced, the gas reducing valve can be applied to a low-pressure environment, and the use cost is reduced.
In the above embodiment, the correspondence relationship between the inlet pressure value, the outlet pressure value, and the energization time coefficient when the gas injection valve operates at the subsonic region is stored in the ECU in advance, and therefore, before the current first inlet pressure value and the current first outlet pressure value of the gas injection valve are detected in S201, the method may further include: and acquiring the corresponding relation among an inlet pressure value, an outlet pressure value and an energizing time coefficient when the gas injection valve works in a subsonic region. A method of acquiring the correspondence relationship will be described below as an example. Fig. 3 is a schematic flow chart of a flow compensation method of a gas injection valve according to the present invention. As shown in fig. 3, the method includes:
s301, M × N actual flow values of the gas injection valve under M second inlet pressure values and N second outlet pressure values are obtained, and P actual flow values of the M × N actual flow values when the gas injection valve works in a subsonic speed region, and P pairs of second inlet pressure values and second outlet pressure values corresponding to the P actual flow values are determined.
And detecting M second inlet pressure values and N second outlet pressure values and corresponding actual flow values in the working pressure range of the gas injection valve by adopting a pressure sensor and a flow sensor. Illustratively, the second inlet pressures are 350kPa, 400kPa, 450kPa, 500kPa and 550kPa respectively, the second outlet pressures are 150kPa, 175kPa, 200kPa, 225kPa, 250kPa and 280kPa respectively, and the above-mentioned 5 second inlet pressures and 6 second outlet pressures respectively correspond one-to-one to obtain 30 pairs of second inlet pressure values and second outlet pressure values, where each pair of second inlet pressure values and second outlet pressure values corresponds to one actual flow value, that is, 30 actual flow values are obtained in total.
And determining P actual flow values in the M x N actual flow values when the gas injection valve works in the subsonic speed region according to the definition of the subsonic speed region, namely the ratio of the outlet pressure to the inlet pressure of the gas injection valve, wherein P is less than or equal to M x N. For example, the second inlet pressure is 350kPa and the second outlet pressure is 200kPa, the gas injection valve operates in the subsonic region, and the P pairs of second inlet pressure values and the second outlet pressure values and the P actual flow rate values of the gas injection valve in the subsonic region can be obtained by respectively calculating the ratio of the 30 pairs of second inlet pressure values and the second outlet pressure values.
S302, determining P power-on time coefficients of the gas injection valve under the P pairs of second inlet pressure values and second outlet pressure values according to the P actual flow values.
Wherein, the actual flow value and the power-on time coefficient satisfy the following formula:
wherein, KRAGTE is a power-on time coefficient with the unit of ms/%; rho-0 _ L is the standard air density of 1.293 in g/dm3(ii) a Vh _ zyl is the single cylinder stroke volume of the gas engine, in dm3(ii) a 100 in%; l _ st is an air-fuel ratio; normmk is monoBit conversion coefficients 0.00001667; qstat is the actual flow value in g/min.
The following table is a corresponding relation table of the second inlet pressure value and the second outlet pressure value of the gas injection valve and the power-on time coefficient.
The underlined power-on time coefficients in the table are those for gas injection valves operating in the supersonic region, for example, when the inlet pressure is 450kPa and the outlet pressure is 175kPa, the gas injection valve operates in the supersonic region, corresponding to a power-on time coefficient of 0.378357. The power-up time factor not underlined in the table is a power-up time factor of the gas injection valve operating in the subsonic region, for example, when the inlet pressure is 450kPa and the outlet pressure is 250kPa, the gas injection valve operates in the subsonic region, and the corresponding power-up time factor is 0.392115.
S303, determining the corresponding relation between the inlet pressure value and the outlet pressure value of the gas injection valve working in the subsonic region and the power-on time coefficient according to the P power-on time coefficients and the P pairs of second inlet pressure values and second outlet pressure values.
Optionally, according to the P power-on time coefficients and the P pairs of second inlet pressure values and second outlet pressure values, linear interpolation is performed on the power-on time coefficients of the gas injection valve when the gas injection valve operates in the subsonic region, so as to obtain a corresponding relationship between the inlet pressure values and the outlet pressure values of the gas injection valve when the gas injection valve operates in the subsonic region and the power-on time coefficients. As shown in fig. 4, the three-dimensional data calibration graph obtained by performing linear difference on the data in the above table is a corresponding relation between all inlet pressure values and outlet pressure values of the gas injection valve operating in the subsonic region and the power-on time coefficient.
In the embodiment, a plurality of corresponding power-on time coefficients are obtained by detecting a plurality of actual flow values of the gas injection valve working in the subsonic region, and then linear difference values are carried out on the plurality of power-on time coefficients to obtain the corresponding relation between all inlet pressure values and outlet pressure values of the gas injection valve working in the subsonic region and the power-on time coefficients, so that the compensation of power-on time is carried out according to the power-on time coefficients when the gas injection valve works in the subsonic region, and the gas quantity injected by the gas injection valve can reach the required gas quantity.
In the above embodiment, the flow rate compensation method in which the gas injection valve operates in the subsonic region is exemplified. When the gas injection valve is operated in the supersonic region, the flow compensation can be performed as follows.
If the gas injection valve works in the supersonic speed area, determining a second power-on time coefficient corresponding to the first inlet pressure value according to the corresponding relation between the inlet pressure value and the power-on time coefficient when the gas injection valve works in the supersonic speed area; determining a second power-on time of the gas injection valve according to the second power-on time coefficient; and controlling the gas injection valve to inject gas according to the second power-on time.
The actual flow value of the gas injection valve operating in the supersonic speed region is only related to the inlet pressure thereof, and the corresponding relationship between the actual flow value and the power-on time coefficient can also be obtained by using the formula in the above embodiment, for example, the data shown by the underlined portion in the table of the above embodiment is the corresponding relationship between the inlet pressure value and the power-on time coefficient of the gas injection valve operating in the supersonic speed region. According to the corresponding relation, a second power-on time coefficient corresponding to the first inlet pressure value can be determined; the method for determining the second power-up time according to the second power-up time coefficient is similar to the above embodiment, and is not described herein again.
Fig. 5 is a schematic structural diagram of a flow compensation device of a gas injection valve provided in the present invention. As shown in fig. 5, the flow rate compensation device 50 of the gas injection valve includes:
an obtaining module 501, configured to obtain a current first inlet pressure value and a current first outlet pressure value of the gas injection valve;
a judging module 502, configured to determine whether the gas injection valve operates in a subsonic region according to the first inlet pressure value and the first outlet pressure value;
a first determining module 503, configured to determine, when the gas injection valve operates in a subsonic region, a first energization time coefficient corresponding to the first inlet pressure value and the first outlet pressure value according to a corresponding relationship between an inlet pressure value, an outlet pressure value, and an energization time coefficient when the gas injection valve operates in the subsonic region;
a second determining module 504 for determining a first power-on time of the gas injection valve according to the first power-on time coefficient;
and the control module 505 is used for controlling the gas injection valve to inject gas according to the first power-on time.
Optionally, the obtaining module 501 is further configured to obtain a corresponding relationship between an inlet pressure value and an outlet pressure value of the gas injection valve when the gas injection valve operates in a subsonic region, and an energization time coefficient.
Optionally, the obtaining module 501 is configured to:
detecting M actual flow values of the gas injection valve under M second inlet pressure values and N second outlet pressure values, and determining P actual flow values of the M actual flow values when the gas injection valve works in a subsonic velocity region, and P pairs of second inlet pressure values and second outlet pressure values corresponding to the P actual flow values;
determining P power-on time coefficients of the gas injection valve under P pairs of second inlet pressure values and second outlet pressure values according to the P actual flow values;
and determining the corresponding relation between the inlet pressure value and the outlet pressure value of the gas injection valve working at the subsonic speed zone and the power-on time coefficient according to the P power-on time coefficients and the P pairs of second inlet pressure values and second outlet pressure values.
Optionally, each of the P actual flow values and the corresponding power-on time coefficient satisfy the following formula:
wherein KRAGTE is a power-on time coefficient; rho _0_ L is standard air density 1.293; vh _ zyl is the single cylinder stroke volume; 100 in%; l _ st is an air-fuel ratio; the norm is a unit conversion coefficient 0.00001667; qstat is the actual flow value.
Optionally, the obtaining module 501 is configured to:
and performing linear interpolation on the power-on time coefficient of the gas injection valve working in the subsonic region according to the P power-on time coefficients and the P pair of second inlet pressure values and second outlet pressure values to obtain the corresponding relation between the inlet pressure values and the outlet pressure values of the gas injection valve working in the subsonic region and the power-on time coefficients.
Optionally, the second determining module 504 is configured to:
and multiplying the charging quantity of the gas engine where the gas injection valve is located by the first power-on time coefficient to obtain the first power-on time of the gas injection valve.
Optionally, the first determining module 503 is further configured to:
if the gas injection valve works in the supersonic speed area, determining a second power-on time coefficient corresponding to the first inlet pressure value according to the corresponding relation between the inlet pressure value and the power-on time coefficient when the gas injection valve works in the supersonic speed area;
correspondingly, the second determining module 504 is further configured to determine a second power-on time of the gas injection valve according to the second power-on time coefficient;
the control module 505 is further configured to control the gas injection valve to inject the gas according to the second power-up time.
Fig. 6 is a schematic structural diagram of a flow compensation device of a gas injection valve according to the present invention. As shown in fig. 6, the flow rate compensation device 60 of the gas injection valve includes: a memory 601 and a processor 602; the memory 601 is connected to the processor 602.
The memory 601 is used for storing computer programs.
A processor 602 for implementing the method for flow compensation of a gas injection valve as in any of the embodiments described above when the computer program is executed.
The present invention provides a storage medium having stored thereon a computer program which, when executed by a processor, implements a method of flow compensation for a gas injection valve as in any of the embodiments described above.
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 (7)
1. A method of flow compensation for a gas injection valve, comprising:
acquiring a corresponding relation between an inlet pressure value, an outlet pressure value and a power-on time coefficient when the gas injection valve works in a subsonic region;
acquiring a current first inlet pressure value and a current first outlet pressure value of the gas injection valve;
determining whether the gas injection valve works in a subsonic speed region or not according to the first inlet pressure value and the first outlet pressure value;
if the gas injection valve works in a subsonic speed region, determining a first power-up time coefficient corresponding to the first inlet pressure value and the first outlet pressure value according to the corresponding relation among the inlet pressure value, the outlet pressure value and the power-up time coefficient when the gas injection valve works in the subsonic speed region;
determining a first power-on time of the gas injection valve according to the first power-on time coefficient;
controlling the gas injection valve to inject gas according to the first power-up time;
wherein, the obtaining of the corresponding relationship among the inlet pressure value, the outlet pressure value and the power-on time coefficient when the gas injection valve works at the subsonic region includes:
acquiring M actual flow values of the gas injection valve under M second inlet pressure values and N second outlet pressure values, and determining P actual flow values of the M actual flow values when the gas injection valve works in a subsonic velocity region, and P pairs of second inlet pressure values and second outlet pressure values corresponding to the P actual flow values;
determining P power-on time coefficients of the gas injection valve under the P pairs of second inlet pressure values and second outlet pressure values according to the P actual flow values;
determining the corresponding relation between the inlet pressure value and the outlet pressure value of the gas injection valve working at the subsonic speed zone and the power-on time coefficient according to the P power-on time coefficients and the P pairs of second inlet pressure values and second outlet pressure values;
each of the P actual flow values and the corresponding power-up time coefficient satisfy the following formula:
wherein KRAGTE is a power-on time coefficient; rho _0_ L is the standard air density; vh _ zyl is the single cylinder stroke volume; 100 in%; l _ st is an air-fuel ratio; the Normmk is a unit conversion coefficient; qstat is the actual flow value.
2. The method according to claim 1, wherein said determining, from said P energization time coefficients and said P pairs of second inlet pressure values and second outlet pressure values, the correspondence between inlet pressure values and outlet pressure values and energization time coefficients for said gas injection valve operating in a subsonic region comprises:
and performing linear interpolation on the power-on time coefficient of the gas injection valve working in the subsonic speed region according to the P power-on time coefficients and the P pair of second inlet pressure values and second outlet pressure values to obtain the corresponding relation between the inlet pressure values and the outlet pressure values of the gas injection valve working in the subsonic speed region and the power-on time coefficients.
3. The method of claim 1, wherein said determining a first power-up time for said gas injection valve based on said first power-up time factor comprises:
and multiplying the charging amount of the gas engine with the gas injection valve by the first power-on time coefficient to obtain the first power-on time of the gas injection valve.
4. The method of claim 1, further comprising:
if the gas injection valve works in the supersonic speed area, determining a second power-on time coefficient corresponding to the first inlet pressure value according to the corresponding relation between the inlet pressure value and the power-on time coefficient when the gas injection valve works in the supersonic speed area;
determining a second power-on time of the gas injection valve according to the second power-on time coefficient;
and controlling the gas injection valve to inject gas according to the second power-up time.
5. A flow compensation device for a gas injection valve, comprising:
the acquisition module is used for acquiring the corresponding relation among an inlet pressure value, an outlet pressure value and a power-up time coefficient when the gas injection valve works in a subsonic speed zone; acquiring a current first inlet pressure value and a current first outlet pressure value of the gas injection valve;
the judging module is used for determining whether the gas injection valve works in a subsonic speed region or not according to the first inlet pressure value and the first outlet pressure value;
the first determining module is used for determining a first power-on time coefficient corresponding to the first inlet pressure value and the first outlet pressure value according to the corresponding relation among the inlet pressure value, the outlet pressure value and the power-on time coefficient when the gas injection valve works in a subsonic speed area;
the second determination module is used for determining the first power-on time of the gas injection valve according to the first power-on time coefficient;
the control module is used for controlling the gas injection valve to inject gas according to the first power-on time;
the obtaining module is specifically configured to obtain M × N actual flow values of the gas injection valve at M second inlet pressure values and N second outlet pressure values, and determine P actual flow values of the M × N actual flow values when the gas injection valve operates at a subsonic velocity region, and P pairs of second inlet pressure values and second outlet pressure values corresponding to the P actual flow values; determining P power-on time coefficients of the gas injection valve under the P pairs of second inlet pressure values and second outlet pressure values according to the P actual flow values; determining the corresponding relation between the inlet pressure value and the outlet pressure value of the gas injection valve working at the subsonic speed zone and the power-on time coefficient according to the P power-on time coefficients and the P pairs of second inlet pressure values and second outlet pressure values;
each of the P actual flow values and the corresponding power-up time coefficient satisfy the following formula:
wherein KRAGTE is a power-on time coefficient; rho _0_ L is the standard air density; vh _ zyl is the single cylinder stroke volume; 100 in%; l _ st is an air-fuel ratio; the Normmk is a unit conversion coefficient; qstat is the actual flow value.
6. A flow compensation device of a gas injection valve, comprising: a memory and a processor; the memory is connected with the processor;
the memory for storing a computer program;
the processor, when being executed with a computer program, is adapted to implement a method of flow compensation of a gas injection valve according to any of the claims 1-4.
7. A storage medium having a computer program stored thereon, wherein the computer program, when being executed by a processor, carries out a method of flow compensation of a gas injection valve according to any one of the claims 1-4.
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| CN201911396190.2A CN111140403B (en) | 2019-12-30 | 2019-12-30 | Flow compensation method, device and equipment of gas injection valve |
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| US5474054A (en) * | 1993-12-27 | 1995-12-12 | Ford Motor Company | Fuel injection control system with compensation for pressure and temperature effects on injector performance |
| WO2010006356A1 (en) * | 2008-06-30 | 2010-01-21 | Orbital Australia Pty Ltd | Gaseous fuel injection system for engines |
| BRPI1015944A2 (en) * | 2009-06-30 | 2016-04-19 | Orbital Australia Pty Ltd | fuel injector gain compensation for subsonic flow |
| CN202325876U (en) * | 2011-08-17 | 2012-07-11 | 潍柴动力股份有限公司 | Equipment for controlling fuel injector |
| CN102536492A (en) * | 2012-02-15 | 2012-07-04 | 潍柴动力股份有限公司 | Method for correcting power-up time of fuel sprayer based on air inlet pressure |
| GB2518432A (en) * | 2013-09-23 | 2015-03-25 | Gm Global Tech Operations Inc | A control apparatus for operating a fuel injector |
| CN105257418B (en) * | 2015-10-27 | 2018-07-03 | 潍柴动力股份有限公司 | A kind of fuel oil injection control method |
| CN110296018B (en) * | 2019-06-29 | 2022-01-25 | 潍柴动力股份有限公司 | Power-up time calculation method and device |
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