A method, apparatus, and vehicle for controlling an injection valve

Abstract

The application discloses a kind of injection valve control method, equipment and vehicle, it is related to engine field, can determine out injection valve execution strategy according to the current operating condition of engine.According to injection valve execution strategy, determine the number of first injection valve that needs to start injection in the working cycle of engine, and the number of second injection valve that does not need to start injection.Further, the injection mode of the first injection valve that needs to start injection is determined as: continuous injection mode or partial injection mode.Based on this, select the first number of first injection valve from all injection valve, and control each first injection valve to execute injection operation according to corresponding injection mode.Thereby, according to the different fuel demand of engine under different working conditions, the number of full-time continuous injection, partial continuous injection and non-injection injection valve in working cycle is adjusted, to ensure the uniformity of fuel injection in cylinder, improve the mixing uniformity of fuel and air.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine, in particular to a method, device and vehicle for controlling injection valve. BACKGROUND

[0002] At present, natural gas engine usually adopts the way of single-point injection of intake manifold to inject natural gas, and then the natural gas mixed with air enters each cylinder to do work. When multiple injection valves are combined to control the injection of natural gas, the multiple injection valves usually inject natural gas according to the firing sequence and injection interval of each cylinder of the engine. This easily causes the unevenness of natural gas injection in the cylinder, and further causes the unevenness of the mixed gas after mixing with air, which aggravates the inconsistency of intake air of each cylinder, causes the inconsistency of combustion between cylinders, and reduces the performance of the engine. SUMMARY

[0003] In view of the above problems, the present application provides a method, device and vehicle for controlling injection valve to achieve the purpose of uniformity of fuel and air mixing and improvement of engine performance. The specific scheme is as follows:

[0004] The first aspect of the present application provides a method for controlling injection valve, comprising:

[0005] determining an injection valve execution strategy according to the current operating condition of the engine;

[0006] determining a first number of first injection valves, a second number of second injection valves and an injection mode of each of the first injection valves according to the injection valve execution strategy, the first injection valves being injection valves to be started, the second injection valves being injection valves not to be started, and the injection mode being a continuous injection mode or a partial injection mode, the continuous injection mode representing continuous injection in one working cycle of the engine, and the partial injection mode representing continuous injection in part of a cycle of the one working cycle, the sum of the first number and the second number being the number of all injection valves;

[0007] selecting the first number of first injection valves from the all injection valves, and controlling each of the first injection valves to perform injection operation according to the corresponding injection mode.

[0008] In a possible implementation, the determining of the injection valve execution strategy according to the current operating condition of the engine comprises:

[0009] obtaining the injection valve execution strategy corresponding to the interval range of a continuous injection value of a single injection valve, the continuous injection value representing the angle or time length of continuous injection of the single injection valve in the one working cycle.

[0010] In a possible implementation, if the continuous injection value is within a first interval range, and a maximum value of the first interval range is a first continuous injection value, a first injection valve execution strategy corresponding to the first interval range comprises:

[0011] A first number of first injection valves is determined from a first injection valve calibration map according to the continuous injection value and the natural gas pressure, and each of the first injection valves is determined as the partial injection mode;

[0012] The injection valves other than the first injection valves among the total injection valves are determined as the second injection valves.

[0013] In a possible implementation, the first injection valve execution strategy corresponding to the first interval range further comprises:

[0014] A continuous injection value corresponding to the partial injection mode is determined according to a total continuous injection value and the first number, the total continuous injection value being a sum of the continuous injection values of the total injection valves.

[0015] In a possible implementation, if the continuous injection value is within a second interval range, and a minimum value of the second interval range is a first continuous injection value, and a maximum value of the second interval range is a second continuous injection value, a second injection valve execution strategy corresponding to the second interval range comprises:

[0016] A third number of first injection valves is determined according to a number of working cycle values contained in a total continuous injection value, and each of the first injection valves in the third number of first injection valves is determined as the continuous injection mode, the total continuous injection value being a sum of the continuous injection values of the total injection valves, and the working cycle value being an angle or a time length of one working cycle;

[0017] A fourth number of first injection valves is determined from a second injection valve calibration map according to the continuous injection value and the natural gas pressure, and each of the first injection valves in the fourth number of first injection valves is determined as the partial injection mode;

[0018] The injection valves other than the first injection valves among the total injection valves are determined as the second injection valves.

[0019] In a possible implementation, the second injection valve execution strategy corresponding to the second interval range further comprises:

[0020] A continuous injection value corresponding to the partial injection mode is determined according to a continuous injection difference value and the fourth number, the continuous injection difference value being a difference between the total continuous injection value and a total working cycle value, and the total working cycle value being a sum of the total working cycle values.

[0021] In a possible implementation, if the continuous injection value is in a third interval range, and a minimum value of the third interval range is a second continuous injection value, a third injection valve execution strategy corresponding to the third interval range comprises:

[0022] all the injection valves are taken as the first injection valves, and each of the first injection valves is determined as the partial injection mode.

[0023] In a possible implementation, when the first injection valves are in the partial injection mode, the control of each of the first injection valves to perform the injection operation according to the corresponding injection mode comprises:

[0024] determining a firing cylinder according to a current firing timing of the engine;

[0025] determining a target injection valve according to a position of the firing cylinder, and taking the target injection valve as the first injection valve to perform the injection operation in the partial injection mode.

[0026] The second aspect of the application provides an injection valve control device, comprising at least one processor and a memory connected to the processor, wherein:

[0027] the memory is configured to store a computer program;

[0028] the processor is configured to execute the computer program, so that the injection valve control device can implement the injection valve control method of the first aspect or any implementation manner of the first aspect.

[0029] The third aspect of the application provides a vehicle, comprising the injection valve control device of the second aspect.

[0030] The fourth aspect of the application provides an injection valve control device, comprising:

[0031] an execution strategy determination module configured to determine an injection valve execution strategy according to a current operating condition of an engine;

[0032] an injection valve state allocation module configured to determine a first number of first injection valves, a second number of second injection valves, and an injection mode of each of the first injection valves according to the injection valve execution strategy, the first injection valves being injection valves to be started, the second injection valves being injection valves not to be started, the injection mode being a continuous injection mode or a partial injection mode, the continuous injection mode representing continuous injection in one working cycle of the engine, the partial injection mode representing continuous injection in a part of a cycle of one working cycle, and a sum of the first number and the second number being a number of all the injection valves; and

[0033] a jet valve control module configured to select the first number of first jet valves from the total jet valves and control each of the first jet valves to perform a jetting operation according to a corresponding jetting mode.

[0034] The fifth aspect of the present application provides a computer program product, which comprises computer readable instructions, when the computer readable instructions are executed on an electronic device, the electronic device implements the jet valve control method of the first aspect or any implementation manner of the first aspect.

[0035] The sixth aspect of the present application provides a computer storage medium, which carries one or more computer programs, when the one or more computer programs are executed by an electronic device, the electronic device can implement the jet valve control method of the first aspect or any implementation manner of the first aspect.

[0036] According to the above technical solution, the jet valve control method provided by the present application can determine the jet valve execution strategy according to the current operating condition of the engine. According to the jet valve execution strategy, the number of first jet valves that need to be started for jetting and the number of second jet valves that do not need to be started for jetting in the working cycle of the engine are determined. And further determine the jetting mode of the first jet valve that needs to be started for jetting as: continuous jetting mode or partial jetting mode, wherein the continuous jetting mode represents continuous jetting in one working cycle of the engine, and the partial jetting mode represents continuous jetting in part of the cycle process of one working cycle. On this basis, the first number of first jet valves is selected from the total jet valves, and each first jet valve is controlled to perform a jetting operation according to the corresponding jetting mode. Thus, according to the different fuel demand amounts of the engine under different working conditions, the number of jet valves that are continuously jetted, partially jetted and not jetted in the working cycle is flexibly adjusted, the uniformity of fuel injection in the cylinder is ensured, and the mixing uniformity of fuel and air is improved, thereby improving the stability of the engine. BRIEF DESCRIPTION OF DRAWINGS

[0037] The above and other features, advantages, and aspects of the present disclosure will become more apparent by referring to the following detailed description in conjunction with the accompanying drawings. Throughout the drawings, like or similar reference numerals are used to refer to like or similar elements throughout the various figures. It should be understood that the drawings are diagrammatic and schematic representation of elements and features do not necessarily depict the actual scale or proportions.

[0038] Figure 1 A flowchart of a jet valve control method provided by the present application;

[0039] Figure 2 A flowchart of another jet valve control method provided by the present application;

[0040] Figure 3A schematic diagram of an injection valve control device is provided in the present application.

[0041] Figure 4 A schematic diagram of an injection valve control device is provided in the present application. DETAILED DESCRIPTION

[0042] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application. The terms used in the embodiment part of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0043] The embodiments of the present application are described below in conjunction with the drawings. It is known to those skilled in the art that as technology develops and new scenarios appear, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0044] The terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, and this is only a way of distinguishing the objects with the same attributes described in the embodiments of the present application. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, so that the processes, methods, systems, products or equipment containing a series of units are not necessarily limited to those units, but can include other units not clearly listed or inherent to these processes, methods, products or equipment.

[0045] At present, natural gas engines generally adopt the technical solution of single-point injection of an intake manifold. When multiple injection valves are combined for fuel injection control, the multiple injection valves are generally evenly injected according to the firing order and uniform interval angle of each cylinder of the engine. The continuous injection angle or time of each injection valve will be different according to different operating conditions of the engine. The higher the load, the larger the continuous injection angle. Such injection mode will cause uneven fuel injection, thereby causing uneven mixture after mixing with air, and exacerbating the problem of inconsistent intake of each cylinder, especially in low load and one-side intake engines: for example, if the total continuous injection angle of all injection valves is less than one working cycle (two revolutions of the crankshaft, 720 degrees) at low load, there is an injection interval between each injection valve, causing uneven mixture. For example, for one-side intake engines, such as intake from the 1 cylinder side, the above injection mode will cause uneven intake of mixture into each cylinder in one working cycle. Uneven intake of mixture into each cylinder will cause inconsistent combustion, affecting engine performance, especially the stability of speed and torque output.

[0046] Although, there are optimization schemes for natural gas engine fuel injection in the prior art, but its main is in the low load fuel injection amount small caused by the short injection valve drive time, the problem caused by the unstable opening of the injection valve. It can not solve the problem of how to reasonably control the uniformity of fuel injection under different working conditions, and further cannot solve the problem of inconsistent mixture concentration in each cylinder caused by uneven fuel injection.

[0047] To solve the above problems, the embodiment of the application provides a kind of injection valve control method. The injection valve control method of the embodiment of the application will be described in detail below with reference to the drawings.

[0048] Referring to Figure 1 , Figure 1 The flow chart of the injection valve control method provided by the embodiment of the application is shown in Figure 1 The injection valve control method provided by the embodiment of the application can include steps 101 to 103, which will be described in detail below.

[0049] 101, according to the current operating condition of the engine, determine the injection valve execution strategy.

[0050] In one embodiment, the current operating condition of the engine can be characterized by the engine speed and the continuous injection value of a single group of injection valves, wherein the continuous injection value can be characterized by the continuous injection time or angle of a single group of injection valves in one working cycle of the engine. One working cycle of the engine is two rotations of the crankshaft, corresponding to an angle range of 720 degrees. According to the engine speed and the continuous injection time of a single group of injection valves, the continuous injection angle of a single group of injection valves can be determined. To facilitate the determination of the subsequent injection valve execution strategy, the continuous injection angle can be used to represent the current operating condition. Of course, the continuous injection time of a single group of injection valves can also be used to represent the current operating condition.

[0051] Among them, the current operating condition of the engine is determined according to the average injection of the current multiple injection valves according to the firing order and uniform interval angle of each cylinder of the engine. The continuous injection angle or continuous injection time of a single group of injection valves.

[0052] On this basis, the corresponding injection valve execution strategy can be determined according to the size of the continuous injection angle or the size of the continuous injection time of a single group of injection valves. Taking the continuous injection angle of a single group of injection valves as an example, different injection valve execution strategies can be adopted according to the different continuous injection angles of a single group of injection valves. The number of open injection valves can be adjusted by executing the injection valve execution strategy, and the injection mode of the open injection valves can be set to make the mixture of fuel and air in the cylinder more uniform.

[0053] For example, as the continuous injection angle of the single group of injection valves increases (i.e. the engine load increases), the number of injection valves to be opened and the injection mode are dynamically adjusted: for example, for a 6-cylinder natural gas engine, when the continuous injection angle of the single group of injection valves is less than 120 degrees, i.e. the total continuous injection angle of the 6 groups of injection valves is less than 720 degrees (1 working cycle), 1 to 3 injection valves are randomly selected to perform injection, and the continuous injection angle of each injection valve can be evenly divided according to the total continuous injection angle of the 6 groups of injection valves.

[0054] As the engine load increases, when the continuous injection angle of the single group of injection valves is in the range of 120 degrees to 600 degrees, the number of injection valves to be started can be gradually increased according to the increase of the fuel required by the engine, and the continuous injection angle of the injection valves to be started is set to 720 degrees to meet the requirement of uniform mixing of fuel and air in the cylinder.

[0055] When the continuous injection angle of the single group of injection valves is greater than 600 degrees, all injection valves are started to perform injection drive according to the firing sequence of each cylinder and the continuous injection angle to maximize the power demand.

[0056] It can be understood that those skilled in the art can select and adjust the content of the above injection valve execution strategy according to different engine models and different working condition requirements, which is not limited herein.

[0057] 102. According to the injection valve execution strategy, a first number of first injection valves, a second number of second injection valves, and an injection mode of each first injection valve are determined, the first injection valves are injection valves to be started, the second injection valves are injection valves not to be started, and the injection mode is a continuous injection mode or a partial injection mode, the continuous injection mode represents continuous injection in one working cycle of the engine, and the partial injection mode represents continuous injection in part of a cycle in one working cycle, and the sum of the first number and the second number is the number of all injection valves.

[0058] On the basis of determining the injection valve execution strategy, the number of first injection valves and second injection valves and the corresponding injection mode can be determined according to the injection valve execution strategy, which provides a basis for the subsequent control of the first injection valves.

[0059] 103. The first number of first injection valves are selected from all injection valves, and each first injection valve is controlled to perform injection operation according to the corresponding injection mode.

[0060] In one embodiment, since the injection of the first number of the first injection valves is controlled, for the first injection valve with the continuous injection mode, the corresponding number of injection valves can be randomly selected from the 6 groups of injection valves to perform the continuous injection mode. For the remaining fuel, it can be uniformly distributed to the injection valves performing the partial injection mode for injection, and the position of the injection valve performing the partial injection mode can be determined according to the current crank angle time, because the crank angle has a corresponding relationship with the ignition of the corresponding cylinder, and by performing the partial injection mode for the injection of the injection valve close to the ignition cylinder, the uniformity of the fuel mixture in the cylinder is further ensured, and the stability of the engine operation is improved.

[0061] As can be seen from the above, the injection valve control method can open different injection valves and perform different injection modes for fuel injection according to different engine operating conditions. Compared with the existing single-point injection technology, it can effectively reduce the problem of uncontrollable injection flow caused by the injection valve flow being at the critical point of the minimum injection flow under low load, causing unstable speed and load. It can greatly improve the uniformity of air and fuel mixing, improve the consistency of engine intake of each cylinder, and thus improve the combustion characteristics of the engine and enhance the performance and control stability of the engine.

[0062] In one embodiment, to facilitate the rapid and accurate injection of fuel for various operating conditions of the engine and improve the sensitivity of the injection valve control, step 101 determines the injection valve execution strategy according to the current operating condition of the engine, which can specifically include:

[0063] According to the interval range of the continuous injection value of a single injection valve, the injection valve execution strategy corresponding to the interval range is obtained, and the continuous injection value represents the angle or time length of the continuous injection of a single injection valve in one working cycle.

[0064] In a specific implementation, taking a 6-cylinder natural gas engine with 6 groups of injection valves as an example: when the continuous injection angle of a single group of injection valves is less than 120 degrees of crank angle, that is, the total continuous injection angle of the 6 groups of injection valves is less than 720 degrees (1 working cycle), the first injection valve execution strategy is adopted.

[0065] When the continuous injection angle of a single group of injection valves is greater than or equal to 120 degrees of crank angle and less than 600 degrees of crank angle, the second injection valve execution strategy is adopted.

[0066] When the continuous injection angle of a single group of injection valves is greater than or equal to 600 degrees of crank angle, the third injection valve execution strategy is adopted.

[0067] It can be understood that those skilled in the art can adjust the correspondence between the injection valve execution strategy and the interval range according to the number of injection valves, which is not limited herein.

[0068] As an implementation manner of the above embodiment, if the continuous injection value is in the first interval range, and the maximum value of the first interval range is the first continuous injection value, the first injection valve execution strategy corresponding to the first interval range comprises:

[0069] Step 11, determining the first number of first injection valves from the first injection valve calibration map according to the continuous injection value and the natural gas pressure, and determining each first injection valve as a partial injection mode.

[0070] Step 12, taking all injection valves except the first injection valves as second injection valves.

[0071] Taking a 6-cylinder natural gas engine with 6 groups of injection valves as an example, when the continuous injection angle of a single group of injection valves is less than 120 degrees of crank angle, that is, the total continuous injection angle of the 6 groups of injection valves is less than 720 degrees (one working cycle), N1 groups of injection valves can be randomly selected from the 6 groups of injection valves for execution, and the remaining 6-N1 groups of injection valves are prohibited from starting. Wherein the number N1 is obtained by searching a preset first injection valve calibration map according to the continuous injection angle of a single group of injection valves and the current natural gas pressure, and generally 3≥N1≥1.

[0072] Wherein, the continuous injection value corresponding to the partial injection mode can be determined according to the total continuous injection value and the first number, and the total continuous injection value is the sum of the continuous injection values of all injection valves.

[0073] That is, in the above first injection valve execution strategy, the continuous injection angle of each group of injection valves is obtained by dividing the total continuous injection angle by N1. By executing the first injection valve execution strategy, the injection interval between each injection valve can be effectively reduced when the total continuous injection angle is less than one working cycle (720 degrees of crankshaft rotation) at low load, thereby causing unevenness of the mixture.

[0074] If the continuous injection value is in the second interval range, and the minimum value of the second interval range is the first continuous injection value, and the maximum value of the second interval range is the second continuous injection value, the second injection valve execution strategy corresponding to the second interval range comprises:

[0075] Step 21, determining the third number of first injection valves according to the number of working cycle values contained in the total continuous injection value, and determining each first injection valve in the third number of first injection valves as a continuous injection mode, and the total continuous injection value is the sum of the continuous injection values of all injection valves, and the working cycle value is the angle or time length of one working cycle.

[0076] Step 22, determining the fourth number of first injection valves from the second injection valve calibration map according to the continuous injection value and the natural gas pressure, and determining each of the fourth number of first injection valves as a partial injection mode.

[0077] Step 23, taking all injection valves except the first injection valve as the second injection valve.

[0078] For example, still taking the 6-cylinder natural gas engine with 6 groups of injection valves as an example, when the continuous injection angle of a single group of injection valves is greater than or equal to 120 degrees of crank angle and less than 600 degrees of crank angle. Randomly select N2 groups of 6 groups of injection valves to continuously inject 720 degrees (i.e. full opening for 1 working cycle), and randomly select N3 groups of injection valves to perform the remaining fuel injection, and the remaining 6-N2-N3 groups of injection valves are prohibited from starting. Wherein N3 is obtained by looking up the preset second injection valve calibration map through the continuous injection angle of a single group of injection valves and the current natural gas pressure, and generally 3≥N3≥1, wherein the specific group of injection valves performing injection is determined by the crank angle at the time of switching to this working condition. N2 and the total continuous injection value contain the same number of complete working cycles (720 degrees).

[0079] The determination process of the continuous injection value (i.e. the continuous injection angle) corresponding to the partial injection mode of the N3 groups of injection valves is as follows:

[0080] According to the continuous injection difference value and the fourth number, the continuous injection value corresponding to the partial injection mode is determined, and the continuous injection difference value is the difference between the total continuous injection value and the total working cycle value, and the total working cycle value is the sum of all working cycle values.

[0081] That is, the continuous injection angle of each group of injection valves in the N3 groups of injection valves is: the total continuous injection angle minus 720×N2 and then divided by N3.

[0082] In some embodiments, in order to make the mixture of fuel and air in the engine cylinder more uniform, the working condition range used is more detailed, and the injection valve adjustment sensitivity is improved. The second interval range can be further divided according to the total continuous injection angle, and a more detailed injection valve execution strategy is determined.

[0083] For example, when the continuous injection angle of a single group of injection valves is greater than or equal to 120 degrees of crank angle and less than 240 degrees of crank angle, i.e. the total continuous injection angle of 6 groups of injection valves is greater than or equal to 720 degrees (1 working cycle) and less than 1440 degrees (2 working cycles), the fourth injection valve execution strategy is: 1 group of 6 groups of injection valves is randomly selected to continuously inject 720 degrees (i.e. full opening for 1 working cycle).

[0084] The remaining fuel injection is executed by random N4 groups of injection valves, the injection duration of each group of injection valves is the total injection duration minus 720 divided by N4, the remaining 5-N4 groups of injection valves are prohibited from driving, wherein N4 is obtained by searching the preset second injection valve map with the injection duration of a single group of injection valves and the current natural gas pressure, generally 3≥N4≥1, wherein the specific group of injection valves that execute injection is determined by the crank angle at the time of switching to this working condition.

[0085] When the injection duration of a single group of injection valves is greater than or equal to 240 degrees of crank angle and less than 360 degrees of crank angle, i.e., the total injection duration of 6 groups of injection valves is greater than or equal to 1440 degrees (2 working cycles) and less than 2160 degrees (3 working cycles), the fifth injection valve execution strategy is: 6 groups of injection valves randomly inject for 720 degrees (i.e., 1 working cycle full opening) for 2 groups.

[0086] The remaining fuel injection is executed by random N5 groups of injection valves, the injection duration of each group of injection valves is the total injection duration minus 1440 divided by N5, the remaining 4-N5 groups of injection valves are prohibited from driving, wherein N5 is obtained by searching the preset second injection valve map with the injection duration of a single group of injection valves and the current natural gas pressure, generally 3≥N5≥1, wherein the specific group of injection valves that execute injection is determined by the crank angle at the time of switching to this working condition.

[0087] When the injection duration of a single group of injection valves is greater than or equal to 360 degrees of crank angle and less than 480 degrees of crank angle, i.e., the total injection duration of 6 groups of injection valves is greater than or equal to 2160 degrees (3 working cycles) and less than 2880 degrees (4 working cycles), the sixth injection valve execution strategy is: 6 groups of injection valves randomly inject for 720 degrees (i.e., 1 working cycle full opening) for 3 groups.

[0088] The remaining fuel injection is executed by random N6 groups of injection valves, the injection duration of each group of injection valves is the total injection duration minus 2160 divided by N6, the remaining 3-N6 groups of injection valves are prohibited from driving, wherein N6 is obtained by searching the preset second injection valve map with the injection duration of a single group of injection valves and the current natural gas pressure, generally 3≥N6≥1, wherein the specific group of injection valves that execute injection is determined by the crank angle at the time of switching to this working condition.

[0089] When the injection duration of a single group of injection valves is greater than or equal to 480 degrees of crank angle and less than 600 degrees of crank angle, i.e., the total injection duration of 6 groups of injection valves is greater than or equal to 2880 degrees (4 working cycles) and less than 3600 degrees (5 working cycles), the seventh injection valve execution strategy is: 6 groups of injection valves randomly inject for 720 degrees (i.e., 1 working cycle full opening) for 4 groups.

[0090] The remaining fuel injection is performed by random N7 groups of injection valves, each group of injection valves has a continuous injection angle of total continuous injection angle minus 2880 divided by N7, and the remaining 2-N7 groups of injection valves are prohibited from driving, wherein N7 is obtained by searching a preset second injection valve calibration map according to the single group of injection valve continuous injection angle and the current natural gas pressure, and generally 2≥N7≥1, wherein the specific group of injection valves performing injection is determined by the crank angle at the time of switching to this working condition.

[0091] It can be understood that the second injection valve calibration map used in the fourth injection valve execution strategy to the seventh injection valve execution strategy can be the same calibration map, or can be subdivided into different calibration maps, which is not limited here.

[0092] In addition, the values of N4 to N7 can be uniformly taken as 2, that is, 2 groups of injection valves are used to perform partial injection mode to complete the injection of the remaining fuel.

[0093] In other embodiments, when the engine load is large, in order to prioritize the power demand of the engine, when the continuous injection value is in the third interval range and the minimum value of the third interval range is the second continuous injection value, the third injection valve execution strategy corresponding to the third interval range includes:

[0094] Step 31, all injection valves are used as first injection valves, and each first injection valve is determined as a partial injection mode.

[0095] For example, when the continuous injection angle of a single group of injection valves is greater than or equal to 600 degrees of crank angle, 6 groups of injection valves are all injected, each group of injection valves can perform injection driving according to the firing order of each cylinder (such as the cylinder order of 1, 5, 3, 2, 4, and 6) and the continuous injection angle, or directly according to the valve injection demand of a single injection valve to perform injection.

[0096] When the first injection valve is in a partial injection mode, controlling each first injection valve to perform injection operation according to the corresponding injection mode can specifically include:

[0097] Step 41, according to the current ignition timing of the engine, the ignition cylinder is determined.

[0098] Step 42, the target injection valve is determined according to the position of the ignition cylinder, and the target injection valve is used as the first injection valve to perform injection operation in a partial injection mode.

[0099] Specifically, the ignition of the cylinder also has a corresponding relationship with the crank angle, in one working cycle (720 degrees of crank rotation) of the engine, each cylinder is ignited once. The cylinder to be ignited can be determined according to the current crank angle, and then the target injection valve corresponding to the cylinder is used as the first injection valve, and injection operation is performed in a partial injection mode.

[0100] As a specific application of the above-mentioned injection valve control method, with reference to Figure 2 , the injection valve control method can include the following processes:

[0101] After the engine starts running, the engine speed, injection valve continuous injection time, and natural gas rail pressure (i.e., natural gas pressure) are obtained.

[0102] The injection valve continuous injection angle is calculated according to the engine speed and injection valve continuous injection time under the current working condition.

[0103] When the injection valve continuous injection angle is less than 120 degrees, injection is performed according to injection mode 1 (i.e., according to the first injection valve execution strategy).

[0104] When the injection valve continuous injection angle is greater than or equal to 120 degrees and less than 240 degrees, injection is performed according to injection mode 2 (i.e., according to the fourth injection valve execution strategy).

[0105] When the injection valve continuous injection angle is greater than or equal to 240 degrees and less than 360 degrees, injection is performed according to injection mode 3 (i.e., according to the fifth injection valve execution strategy).

[0106] When the injection valve continuous injection angle is greater than or equal to 360 degrees and less than 480 degrees, injection is performed according to injection mode 4 (i.e., according to the sixth injection valve execution strategy).

[0107] When the injection valve continuous injection angle is greater than or equal to 480 degrees and less than 600 degrees, injection is performed according to injection mode 5 (i.e., according to the seventh injection valve execution strategy).

[0108] When the injection valve continuous injection angle is greater than or equal to 600 degrees, injection is performed according to injection mode 6 (i.e., according to the third injection valve execution strategy).

[0109] It can be understood that both the opening and closing of the injection valve require time, and in order to prevent the injection valve from overheating or aging due to long-term continuous injection, the maximum continuous angle of the injection valve continuous injection angle is generally less than one working cycle (720 degrees), such as 700 degrees. The skilled person can select and set according to actual needs, which is not limited here.

[0110] The above introduces a kind of injection valve control method provided by the embodiment of the application, and the device for executing the injection valve control method described above will be introduced below.

[0111] Please refer to Figure 3 , Figure 3 for the structure diagram of the injection valve control device provided by the embodiment of the application. As shown in Figure 3 , the injection valve control device comprises:

[0112] The execution strategy determining module 301 is configured to determine an execution strategy of the injection valves according to a current operating condition of the engine.

[0113] The injection valve state assigning module 302 is configured to determine, according to the execution strategy of the injection valves, a first number of first injection valves, a second number of second injection valves, and an injection mode of each of the first injection valves, the first injection valves being injection valves to be started, the second injection valves being injection valves not to be started, and the injection mode being a continuous injection mode or a partial injection mode, the continuous injection mode representing continuous injection in one working cycle of the engine, and the partial injection mode representing continuous injection in a partial cycle of one working cycle, and a sum of the first number and the second number being a total number of the injection valves.

[0114] The injection valve control module 303 is configured to select the first injection valves from the total injection valves, and control each of the first injection valves to perform injection operation according to the corresponding injection mode.

[0115] In a possible implementation, the execution strategy determining module 301 determines the execution strategy of the injection valves according to the current operating condition of the engine, and the process includes:

[0116] According to an interval range in which a continuous injection value of a single injection valve is located, an execution strategy of the injection valves corresponding to the interval range is obtained, the continuous injection value representing an angle or a time length of continuous injection of the single injection valve in one working cycle.

[0117] In a possible implementation, if the continuous injection value is in a first interval range, and a maximum value of the first interval range is a first continuous injection value, a first injection valve execution strategy corresponding to the first interval range in the execution strategy determining module 301 includes:

[0118] According to the continuous injection value and the natural gas pressure, a first injection valve is determined from a first injection valve calibration map, and each of the first injection valves is determined as the partial injection mode.

[0119] All of the injection valves except the first injection valves are taken as the second injection valves.

[0120] In a possible implementation, the first injection valve execution strategy corresponding to the first interval range in the execution strategy determining module 301 further includes:

[0121] According to a total continuous injection value and the first number, a continuous injection value corresponding to the partial injection mode is determined, the total continuous injection value being a sum of the continuous injection values of the total injection valves.

[0122] In a possible implementation, if the continuous injection value is in the second interval range, and the minimum value of the second interval range is the first continuous injection value, and the maximum value of the second interval range is the second continuous injection value, the second injection valve execution strategy corresponding to the second interval range in the execution strategy determination module 301 includes the following steps.

[0123] According to the number of working cycle values contained in the total continuous injection value, a third number of first injection valves is determined, and each of the third number of first injection valves is determined as a continuous injection mode, the total continuous injection value is the sum of the continuous injection values of all injection valves, and the working cycle value is the angle or time length of one working cycle;

[0124] According to the continuous injection value and the natural gas pressure, a fourth number of first injection valves is determined from the second injection valve calibration map, and each of the fourth number of first injection valves is determined as a partial injection mode.

[0125] All injection valves except the first injection valves are regarded as second injection valves.

[0126] In a possible implementation, the second injection valve execution strategy corresponding to the second interval range in the execution strategy determination module 301 further includes the following steps.

[0127] According to the continuous injection difference value and the fourth number, a continuous injection value corresponding to the partial injection mode is determined, the continuous injection difference value is the difference between the total continuous injection value and the total working cycle value, and the total working cycle value is the sum of all working cycle values.

[0128] In a possible implementation, if the continuous injection value is in the third interval range, and the minimum value of the third interval range is the second continuous injection value, the third injection valve execution strategy corresponding to the third interval range in the execution strategy determination module 301 includes the following steps.

[0129] All injection valves are regarded as first injection valves, and each first injection valve is determined as a partial injection mode.

[0130] In a possible implementation, when the first injection valve is in the partial injection mode, the process in which the injection valve control module 303 controls each first injection valve to perform the injection operation according to the corresponding injection mode includes the following steps.

[0131] According to the current ignition timing of the engine, an ignition cylinder is determined.

[0132] According to the position of the ignition cylinder, a target injection valve is determined, and the target injection valve is regarded as a first injection valve to perform the injection operation in the partial injection mode.

[0133] In the embodiments of the present application, a kind of injection valve control device is further provided. Figure 4The diagram illustrates a structural schematic suitable for implementing the injection valve control device in the embodiments of this application. The injection valve control device in the embodiments of this application may include, but is not limited to, devices such as ECU (Electronic Control Unit), VCU (Vehicle Control Unit), MCU (Micro Controller Unit), and HCU (Hybrid Control Unit). Figure 4 The injection valve control device shown is merely an example and should not be construed as limiting the functionality and scope of the embodiments of this application.

[0134] like Figure 4 As shown, the injection valve control device may include a processing unit (e.g., a central processing unit, a graphics processing unit, etc.) 401, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 402 or a program loaded from a storage device 408 into a random access memory (RAM) 403. When the injection valve control device is powered on, the RAM 403 also stores various programs and data required for the operation of the injection valve control device. The processing unit 401, ROM 402, and RAM 403 are interconnected via a bus 404. An input / output (I / O) interface 405 is also connected to the bus 404.

[0135] Typically, the following devices can be connected to I / O interface 405: input devices 406 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 407 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 408 including, for example, memory cards, hard drives, etc.; and communication devices 409. Communication device 409 allows the injection valve control device to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 4 An injection valve control device with various devices is shown; however, it should be understood that it is not required to implement or have all of the devices shown. More or fewer devices may be implemented or included alternatively.

[0136] This application also provides a vehicle that includes the injection valve control device described in the above embodiments.

[0137] This application also provides a computer program product including computer-readable instructions, which, when executed on an electronic device, cause the electronic device to implement any of the injection valve control methods provided in this application.

[0138] The embodiment of the present application further provides a computer readable storage medium, the storage medium carries one or more computer programs, when the one or more computer programs are executed by an electronic device, the electronic device can realize any kind of injection valve control method provided by the embodiment of the present application.

[0139] In addition, it should be noted that the above-described device embodiments are merely illustrative, wherein the units described as separate components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., they can be located in one place or distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment. In addition, the connection relationship between the modules in the device embodiment provided by the present application indicates that there is a communication connection between them, which can be implemented as one or more communication buses or signal lines.

[0140] Through the description of the above embodiments, those skilled in the art can clearly understand that the present application can be realized by means of software and necessary general hardware, and of course, it can also be realized by special hardware including special integrated circuits, special CPUs, special memories, special components, etc. Generally, functions completed by computer programs can be easily realized by corresponding hardware, and the specific hardware structure for realizing the same function can also be various, such as analog circuit, digital circuit or special circuit, etc. However, for the present application, software program implementation is a better embodiment. Based on this understanding, the technical solutions of the present application can be embodied in the form of software products, which are stored in readable storage media, such as computer floppy disks, U disks, mobile hard disks, ROM, RAM, magnetic or optical disks, etc., including a plurality of instructions for making a computer device (which can be a personal computer, a training device, or a network device, etc.) execute the methods described in various embodiments of the present application.

[0141] In the above embodiments, all or part can be realized by software, hardware, firmware or any combination thereof. When realized by software, it can be realized in the form of a computer program product in whole or in part.

[0142] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transmitted from one website, computer, training device or data center to another website, computer, training device or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be stored by the computer or a data storage device such as a training device, a data center, etc. integrated with one or more available media sets. The available media can be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)), etc.

Claims

1. A method of controlling an injection valve, characterized by, The method comprises the following steps: According to the current operating condition of the engine, a injection valve execution strategy is determined: according to the interval range in which the continuous injection value of a single injection valve is located, the injection valve execution strategy corresponding to the interval range is obtained, the continuous injection value representing the angle or time length of continuous injection of the single injection valve in one working cycle; if the continuous injection value is in a first interval range, and the maximum value of the first interval range is a first continuous injection value, then the first injection valve execution strategy corresponding to the first interval range comprises: According to the continuous injection value and the natural gas pressure, a first number of first injection valves are determined from a first injection valve calibration map, and each of the first injection valves is determined as a partial injection mode; All injection valves except the first injection valves are second injection valves; If the continuous injection value is in a second interval range, and the minimum value of the second interval range is a first continuous injection value, and the maximum value of the second interval range is a second continuous injection value, then the second injection valve execution strategy corresponding to the second interval range comprises: According to the number of working cycle values contained in the total continuous injection value, a third number of first injection valves are determined, and each of the first injection valves in the third number of first injection valves is determined as the continuous injection mode, the total continuous injection value being the sum of the continuous injection values of all injection valves, and the working cycle value being the angle or time length of one working cycle; According to the continuous injection value and the natural gas pressure, a fourth number of first injection valves are determined from a second injection valve calibration map, and each of the first injection valves in the fourth number of first injection valves is determined as the partial injection mode; All injection valves except the first injection valves are second injection valves; According to the injection valve execution strategy, the number of first injection valves, the number of second injection valves, and the injection mode of each of the first injection valves are determined, the first injection valves being injection valves to be started, the second injection valves being injection valves not to be started, and the injection mode being a continuous injection mode or a partial injection mode, the continuous injection mode representing continuous injection in one working cycle of the engine, and the partial injection mode representing continuous injection in part of a working cycle, the sum of the number of first injection valves and the number of second injection valves being the number of all injection valves; From all injection valves, the first number of first injection valves are selected, and each of the first injection valves is controlled to perform injection operation according to the corresponding injection mode.

2. The injection valve control method of claim 1, wherein The first injection valve execution strategy corresponding to the first interval range further comprises: According to the total continuous injection value and the first number, a continuous injection value corresponding to the partial injection mode is determined, the total continuous injection value being the sum of the continuous injection values of all injection valves.

3. The injection valve control method of claim 1, wherein The second injection valve execution strategy corresponding to the second interval range further comprises: According to the continuous injection difference and the fourth quantity, a continuous injection value corresponding to the partial injection mode is determined, the continuous injection difference being a difference between the total continuous injection value and a total working cycle value, and the total working cycle value being a sum of all working cycle values.

4. The injection valve control method of claim 1, wherein If the continuous injection value is in a third interval range, and a minimum value of the third interval range is a second continuous injection value, a third injection valve execution strategy corresponding to the third interval range is executed, including: All of the injection valves are taken as the first injection valves, and each of the first injection valves is determined as the partial injection mode.

5. The injection valve control method according to any one of claims 1 to 4, characterized by, When the first injection valve is in the partial injection mode, the control of each of the first injection valves to execute the injection operation according to the corresponding injection mode includes: According to a current ignition timing of the engine, a firing cylinder is determined; According to a position of the firing cylinder, a target injection valve is determined, and the target injection valve is taken as the first injection valve to execute the injection operation according to the partial injection mode.

6. An injection valve control apparatus characterized by comprising: Including at least one processor and a memory connected with the processor, wherein: The memory is used to store a computer program; The processor is used to execute the computer program, so that the injection valve control device can implement the injection valve control method as claimed in any one of claims 1 to 5.

7. A vehicle characterized by comprising: Including: The injection valve control device as claimed in claim 6.

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