Injection valve control method and device and vehicle

Abstract

The invention discloses an injection valve control method and device and a vehicle, relates to the field of engines, and can determine an injection valve execution strategy according to the current operation condition of an engine. And according to the injection valve execution strategy, the number of first injection valves needing to start injection in the working cycle of the engine and the number of second injection valves not needing to start injection are determined. And furthermore, the injection mode of the first injection valve needing to start injection is determined as a continuous injection mode or a partial injection mode. On this basis, a first number of first injection valves are selected from all the injection valves, and each first injection valve is controlled to execute injection operation according to the corresponding injection mode. Therefore, the number of the injection valves for whole-course continuous injection, partial continuous injection and non-injection in the working cycle is adjusted according to different fuel demand quantities of the engine under different working conditions, the uniformity of fuel injection in the air cylinder is guaranteed, and the mixing uniformity of fuel and air is improved.

Description

Technical Field

[0001] The present application relates to the technical field of engines, and particularly to a method, device and vehicle for controlling an injection valve. Background Art

[0002] At present, natural gas engines usually inject natural gas in a single-point injection manner in the intake manifold, and then mix it with air and enter each cylinder for combustion work. When multiple injection valves are combined to control the injection of natural gas, the multiple injection valves usually perform an average injection of natural gas according to the firing order and injection interval of each cylinder of the engine. This easily causes non-uniformity of natural gas injection in the cylinder, and further causes non-uniformity of the mixed gas after mixing with air, exacerbates the inconsistency of intake air in each cylinder, causes inconsistent combustion between cylinders, and reduces the performance of the engine. Summary of the Invention

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

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

[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 the injection mode of each of the first injection valves according to the injection valve execution strategy, where the first injection valves are the injection valves to be started, the second injection valves are the injection valves not to be started, the injection mode is: continuous injection mode or partial injection mode, the continuous injection mode indicates continuous injection in one working cycle of the engine, the partial injection mode indicates continuous injection in a partial cycle of one working cycle, and the sum of the first number and the second number is the number of all injection valves;

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

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

[0009] Obtaining the injection valve execution strategy corresponding to the interval range according to the interval range where the continuous injection value of a single injection valve is located, where the continuous injection value indicates the angle or duration of continuous injection of the single injection valve in one working cycle.

[0010] In a possible implementation, if the continuous injection value is within 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 includes:

[0011] Determine the first injection valves of the first quantity from the first injection valve calibration map according to the continuous injection value and the natural gas pressure, and determine each of the first injection valves as the partial injection mode;

[0012] Use the injection valves among all the injection valves except the first injection valves as the second injection valves.

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

[0014] Determine the continuous injection value corresponding to the partial injection mode according to the total continuous injection value and the first quantity, where the total continuous injection value is the sum of the continuous injection values of all the injection valves.

[0015] In a possible implementation, if the continuous injection value is within the second interval range, 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 includes:

[0016] Determine the first injection valves of the third quantity according to the number of working cycle values included in the total continuous injection value, and determine each of the first injection valves in the third quantity of the first injection valves as the continuous injection mode, where the total continuous injection value is the sum of the continuous injection values of all the injection valves, and the working cycle value is the angle or duration of one working cycle;

[0017] Determine the first injection valves of the fourth quantity from the second injection valve calibration map according to the continuous injection value and the natural gas pressure, and determine each of the first injection valves in the fourth quantity of the first injection valves as the partial injection mode;

[0018] Use the injection valves among all the injection valves except the first injection valves as the second injection valves.

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

[0020] Determine the continuous injection value corresponding to the partial injection mode according to the continuous injection difference and the fourth quantity, where the continuous injection difference 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 the working cycle values.

[0021] In a possible implementation, if the continuous injection value is within the range of a third interval, 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:

[0022] Regarding all the injection valves as the first injection valves, and determining each of the first injection valves as the partial injection mode.

[0023] In a possible implementation, when the first injection valve is in the partial injection mode, controlling each of the first injection valves to perform an injection operation according to the corresponding injection mode includes:

[0024] Determining the ignition cylinder according to the current ignition timing of the engine;

[0025] Determining a target injection valve according to the position of the ignition cylinder, and regarding the target injection valve as the first injection valve to perform the injection operation according to the partial injection mode.

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

[0027] The memory is used for storing a computer program;

[0028] The processor is used for executing the computer program so that the injection valve control device can implement the injection valve control method as described in the first aspect or any implementation manner of the first aspect.

[0029] A third aspect of the present application provides a vehicle, including: the injection valve control device as described in the second aspect above.

[0030] A fourth aspect of the present application provides an injection valve control apparatus, including:

[0031] An execution strategy determination module, configured to determine an injection valve execution strategy according to the current operating condition of the 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 the injection mode of each of the first injection valves according to the injection valve execution strategy, where the first injection valves are the injection valves to be started, the second injection valves are the injection valves not to be started, the injection mode is: a continuous injection mode or a partial injection mode, the continuous injection mode indicates continuous injection during one working cycle of the engine, the partial injection mode indicates continuous injection during a partial cycle of one working cycle, and the sum of the first number and the second number is the number of all injection valves; and,

[0033] An injection valve control module is configured to select the first number of first injection valves from all the injection valves and control each of the first injection valves to perform an injection operation according to a corresponding injection mode.

[0034] A fifth aspect of the present application provides a computer program product, including computer-readable instructions, which, when running on an electronic device, enable the electronic device to implement the injection valve control method according to the first aspect or any implementation manner of the first aspect.

[0035] A 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 injection valve control method according to the first aspect or any implementation manner of the first aspect.

[0036] By means of the above technical solution, the injection valve control method provided by the present application can determine an injection valve execution strategy according to the current operating condition of the engine. According to the injection valve execution strategy, the number of first injection valves that need to start injection and the number of second injection valves that do not need to start injection in the working cycle of the engine are determined. Further, the injection mode of the first injection valves that need to start injection is determined as: a continuous injection mode or a partial injection mode, where the continuous injection mode represents continuous injection in one working cycle of the engine, and the partial injection mode represents continuous injection in a partial cycle of one working cycle. On this basis, the first number of first injection valves are selected from all the injection valves, and each first injection valve is controlled to perform an injection operation according to the corresponding injection mode. Thus, according to the different fuel demand under different engine conditions, the number of injection valves for full-cycle continuous injection, partial continuous injection, and non-injection in the working cycle is flexibly adjusted, ensuring the uniformity of fuel injection in the cylinder, further improving the mixing uniformity of fuel and air, and enhancing the working stability of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In combination with the accompanying drawings and with reference to the following specific embodiments, the above and other features, advantages, and aspects of the various embodiments of the present disclosure will become more apparent. Throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic, and the original components and elements are not necessarily drawn to scale.

[0038] Figure 1 It is a flowchart of an injection valve control method provided by the present application;

[0039] Figure 2 It is a flowchart of another injection valve control method provided by the present application;

[0040] Figure 3The architecture diagram of an injection valve control device provided by this application;

[0041] Figure 4 The structural diagram of the injection valve control device provided by this application. Specific embodiments

[0042] The embodiments of this application will be described below with reference to the accompanying drawings in the embodiments of this application. The terms used in the embodiments part of this application are only used to explain the specific embodiments of this application, rather than aiming to limit this application.

[0043] The embodiments of this application will be described below with reference to the accompanying drawings. Those skilled in the art know that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0044] The terms "first", "second", etc. in the specification, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, which is only a way of distinguishing when describing objects with the same attributes in the embodiments of this application. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion, so that a process, method, system, product or device including a series of units does not have to be limited to those units, but may include other units not clearly listed or inherent to these processes, methods, products or devices.

[0045] Currently, natural gas engines generally adopt the technical solution of single-point injection in the intake manifold. When using a combination of multiple injection valves for fuel injection control, multiple injection valves generally inject fuel evenly according to the firing order of each cylinder of the engine and a uniform interval angle. According to different operating conditions and loads of the engine, the continuous injection angle or duration of each injection valve will be different. The higher the load, the larger the continuous injection angle. This type of injection method will cause uneven fuel injection, resulting in uneven mixture after mixing with air, exacerbating the problem of inconsistent intake of each cylinder. This is particularly prominent in engines with low load and one-sided intake: for example, when the total continuous injection angle of all injection valves is less than one working cycle (the crankshaft rotates two circles, 720 degrees) at low load, there is an injection interval between each injection valve, resulting in uneven mixture. Another example is for an engine with one-sided intake, such as intake from the 1-cylinder side. The above injection method will cause uneven mixture intake into each cylinder within one working cycle. Uneven mixture intake into each cylinder will cause inconsistent combustion, affecting engine performance, especially the stability of speed and torque output.

[0046] Although there are solutions in the prior art for optimizing fuel injection in natural gas engines, they mainly focus on improving the problem of unstable opening of injection valves caused by short driving time of injection valves due to small fuel injection volume at low loads. They cannot solve the problem of how to reasonably control and achieve fuel injection uniformity under different operating conditions where fuel injection requirements vary, and thus do not solve the problem of inconsistent mixture concentrations in each cylinder caused by uneven fuel injection.

[0047] To solve the above problems, an embodiment of the present application provides a method for controlling an injection valve. The method for controlling the injection valve according to the embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0048] Refer to Figure 1 , Figure 1 which is a schematic flow of a method for controlling an injection valve provided by an embodiment of the present application. As Figure 1 shown, a method for controlling an injection valve provided by an embodiment of the present application may include steps 101 to 103, and these steps will be described in detail below.

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

[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 set of injection valves. The continuous injection value can be characterized by the continuous injection duration or angle of a single set of injection valves within one working cycle of the engine. One working cycle of the engine is when the crankshaft rotates two circles, corresponding to an angular range of 720 degrees. According to the engine speed and the continuous injection duration of a single set of injection valves, the continuous injection angle of a single set of injection valves can be determined. For the convenience of determining the subsequent injection valve execution strategy, the current operating condition can be characterized by using the continuous injection angle. Of course, the current operating condition can also be directly characterized by the continuous injection duration of a single set of injection valves.

[0051] Among them, the current operating condition of the engine is determined based on the continuous injection angle or continuous injection duration of a single set of injection valves when multiple current injection valves inject fuel evenly according to the firing order of each cylinder of the engine and at a uniform interval angle.

[0052] On this basis, the corresponding injection valve execution strategy can be determined according to the size of the continuous injection angle or continuous injection duration of a single set of injection valves. Among them, taking the continuous injection angle of a single set of injection valves as the operating condition of the engine as an example, different injection valve execution strategies can be adopted according to different continuous injection angles of a single set of injection valves. By executing the injection valve execution strategy, the number of opened injection valves can be adjusted, and the injection mode of the opened injection valves can be set to make the mixture of injected fuel and air more uniform in the cylinder.

[0053] For example, as the continuous injection angle of a single set of injection valves continuously increases (i.e., the working load of the engine continuously increases), the number of opened injection valves and the injection mode can be dynamically adjusted: Taking a 6-cylinder natural gas engine as an example, when the continuous injection angle of a single set of injection valves is less than 120 degrees, that is, the total continuous injection angle of 6 sets of injection valves is less than 720 degrees (1 working cycle), at this time, 1 to 3 injection valves can be 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 6 sets of injection valves.

[0054] As the engine load continuously increases, when the continuous injection angle of a single set of injection valves is within the range of 120 degrees to 600 degrees, the number of started injection valves can be gradually increased according to the increasing fuel required by the engine, and the continuous injection angle of the increased started injection valves 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 a single set of injection valves is greater than 600 degrees, at this time, all injection valves can be started to perform injection drive according to the firing order and continuous injection angle of each cylinder to meet the power demand to the maximum extent.

[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 conditions, and no limitation is made here.

[0057] 102. According to the injection valve execution strategy, determine the first number of first injection valves, the second number of second injection valves, and the injection mode of each first injection valve. The first injection valves are the injection valves to be started, the second injection valves are the injection valves not to be started, and the injection mode is: continuous injection mode or partial injection mode. The continuous injection mode indicates continuous injection in one working cycle of the engine, and the partial injection mode indicates continuous injection in a partial cycle of one working cycle. 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 the first injection valves and the second injection valves and the corresponding injection mode can be determined according to this injection valve execution strategy, providing a basis for the subsequent control of the first injection valves.

[0059] 103. Select the first number of first injection valves from all injection valves, and control each first injection valve to perform injection operations according to the corresponding injection mode.

[0060] In one embodiment, since the injection of the first injection valves of the first quantity is controlled, for the first injection valves with a continuous injection mode, the corresponding quantity of injection valves can be randomly selected from 6 groups of injection valves to execute the continuous injection mode. For the remaining fuel, it can be evenly distributed to the injection valves executing the partial injection mode for injection, and the positions of the injection valves executing the partial injection mode can be determined according to the current crankshaft rotation angle moment, because there is a corresponding relationship between the crankshaft rotation angle and the ignition of the corresponding cylinder. By this corresponding relationship and preferentially starting the injection valves closer to the ignition cylinder to execute the partial injection mode for injection, 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 above, for this injection valve control method, different injection valves can be opened and different injection modes can be executed 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 minimum injection flow critical point under low load, resulting in unstable engine speed and load. It can also greatly improve the mixing uniformity of air and fuel, improve the intake consistency of each cylinder of the engine, thereby improving the combustion characteristics of the engine and enhancing the engine performance and control stability.

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

[0063] According to the range of the continuous injection value of a single injection valve, obtain the injection valve execution strategy corresponding to the range. The continuous injection value represents the angle or duration of continuous injection of a single injection valve in one working cycle.

[0064] In 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 crankshaft angle, that is, when the total continuous injection angle of 6 groups of injection valves is less than 720 degrees (1 working cycle), it corresponds to the first injection valve execution strategy.

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

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

[0067] It can be understood that those skilled in the art can adjust the corresponding relationship between the above injection valve execution strategy and the range according to the different numbers of injection valves, and no limitation is made here.

[0068] As a feasible implementation of the above embodiments, if the continuous injection value is within 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 includes:

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

[0070] Step 12: Use all injection valves other than the first injection valves as second injection valves.

[0071] Taking a 6-cylinder natural gas engine with 6 groups (pieces) of injection valves as an example, when the continuous injection angle of a single group of injection valves is less than 120 degrees of crankshaft angle, that is, when the total continuous injection angle of 6 groups of injection valves is less than 720 degrees (1 working cycle), N1 groups can be randomly selected from 6 groups of injection valves to perform injection, and the remaining 6 - N1 groups of injection valves are prohibited from starting. The quantity N1 is obtained by looking up the preset first injection valve calibration diagram according to the continuous injection angle of a single group of injection valves and the current natural gas pressure. Generally, 3 ≥ N1 ≥ 1.

[0072] Among them, the continuous injection value corresponding to the partial injection mode can be determined according to the total continuous injection value and the first quantity. 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 implementing the first injection valve execution strategy, it can effectively reduce the injection interval between each injection valve when the total continuous injection angle is less than one working cycle (the crankshaft rotates two turns, 720 degrees) at low load, resulting in uneven mixture.

[0074] If the continuous injection value is within 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 includes:

[0075] Step 21: Determine the third number of first injection valves according to the number of working cycle values included in the total continuous injection value, and determine each first injection valve in the third number of first injection valves 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 duration of one working cycle.

[0076] Step 22: Determine the fourth quantity of first injection valves from the second injection valve calibration chart according to the continuous injection value and the natural gas pressure, and determine each of the fourth quantity of first injection valves as a partial injection mode.

[0077] Step 23: Use all injection valves other than the first injection valves as second injection valves.

[0078] For example, still taking a 6-cylinder natural gas engine with 6 sets (pieces) of injection valves as an example, when the continuous injection angle of a single set of injection valves is greater than or equal to 120 degrees of crankshaft angle and less than 600 degrees of crankshaft angle. Randomly select N2 sets from the 6 sets of injection valves to continuously inject for 720 degrees (i.e., fully open in one working cycle), and randomly N3 sets of injection valves perform the remaining fuel injection, and the remaining 6 - N2 - N3 sets of injection valves are prohibited from starting. Among them, N3 is obtained by looking up the preset second injection valve calibration chart according to the continuous injection angle of a single set of injection valves and the current natural gas pressure. Generally, 3 ≥ N3 ≥ 1, and specifically which set of injection valves performs the injection is confirmed by the crankshaft angle moment when switching to this working condition. N2 is consistent with the number of complete working cycles (720 degrees) included in the total continuous injection value.

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

[0080] Determine the continuous injection value corresponding to the partial injection mode according to the continuous injection difference and the fourth quantity. The continuous injection difference is the difference between the total continuous injection value and the total working cycle value, and the total working cycle value is the sum value of all working cycle values.

[0081] That is, the continuous injection angle of each set of injection valves in the N3 sets of injection valves is obtained by dividing the total continuous injection angle minus 720×N2 by N3.

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

[0083] For example, when the continuous injection angle of a single set of injection valves is greater than or equal to 120 degrees of crankshaft angle and less than 240 degrees of crankshaft angle, that is, when the total continuous injection angle of the 6 sets 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: randomly 1 set of the 6 sets of injection valves continuously injects for 720 degrees (i.e., fully open in one working cycle).

[0084] Random N4 groups of injection valves perform the remaining fuel injection. The continuous injection angle of each group of injection valves is (the total continuous injection angle minus 720) divided by N4. The remaining 5 - N4 groups of injection valves are prohibited from being driven. Here, N4 is obtained by looking up the preset second injection valve calibration map according to the continuous injection angle of a single group of injection valves and the current natural gas pressure. Generally, 3 ≥ N4 ≥ 1. Specifically, which group of injection valves performs the injection is confirmed by the crankshaft rotation angle at the moment of switching to this working condition.

[0085] When the continuous injection angle of a single group of injection valves is greater than or equal to 240 degrees of crankshaft angle and less than 360 degrees of crankshaft angle, that is, the total continuous injection angle 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). Then the execution strategy of the fifth injection valve is: randomly select 2 groups out of 6 groups of injection valves to continuously inject for 720 degrees (i.e., fully open for 1 working cycle).

[0086] Random N5 groups of injection valves perform the remaining fuel injection. The continuous injection angle of each group of injection valves is (the total continuous injection angle minus 1440) divided by N5. The remaining 4 - N5 groups of injection valves are prohibited from being driven. Here, N5 is obtained by looking up the preset second injection valve calibration map according to the continuous injection angle of a single group of injection valves and the current natural gas pressure. Generally, 3 ≥ N5 ≥ 1. Specifically, which group of injection valves performs the injection is confirmed by the crankshaft rotation angle at the moment of switching to this working condition.

[0087] When the continuous injection angle of a single group of injection valves is greater than or equal to 360 degrees of crankshaft angle and less than 480 degrees of crankshaft angle, that is, the total continuous injection angle 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). Then the execution strategy of the sixth injection valve is: randomly select 3 groups out of 6 groups of injection valves to continuously inject for 720 degrees (i.e., fully open for 1 working cycle).

[0088] Random N6 groups of injection valves perform the remaining fuel injection. The continuous injection angle of each group of injection valves is (the total continuous injection angle minus 2160) divided by N6. The remaining 3 - N6 groups of injection valves are prohibited from being driven. Here, N6 is obtained by looking up the preset second injection valve calibration map according to the continuous injection angle of a single group of injection valves and the current natural gas pressure. Generally, 3 ≥ N6 ≥ 1. Specifically, which group of injection valves performs the injection is confirmed by the crankshaft rotation angle at the moment of switching to this working condition;

[0089] When the continuous injection angle of a single group of injection valves is greater than or equal to 480 degrees of crankshaft angle and less than 600 degrees of crankshaft angle, that is, the total continuous injection angle 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). Then the execution strategy of the seventh injection valve is: randomly select 4 groups out of 6 groups of injection valves to continuously inject for 720 degrees (i.e., fully open for 1 working cycle).

[0090] Random N7 groups of injection valves perform the remaining fuel injection. The continuous injection angle of each group of injection valves is (the total continuous injection angle minus 2880) divided by N7. The remaining 2 - N7 groups of injection valves are prohibited from being driven. Among them, N7 is obtained by looking up the preset second injection valve calibration map according to the continuous injection angle of a single group of injection valves and the current natural gas pressure. Generally, 2 ≥ N7 ≥ 1. Specifically, which group of injection valves performs the injection is confirmed by the crankshaft angle moment when switching to this working condition.

[0091] It can be understood that for the above fourth to seventh injection valve execution strategies, the second injection valve calibration maps used can be the same calibration map or can be subdivided into different calibration maps, which are not restricted here.

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

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

[0094] Step 31: All injection valves are regarded as the first injection valves, and each first injection valve is determined to be in the 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 crankshaft angle, at this time, all 6 groups of injection valves inject. Each group of injection valves can perform injection drive according to the firing order of each cylinder (such as the cylinder order of 1, 5, 3, 2, 4, 6) and the continuous injection angle, or directly perform injection according to the valve injection demand of a single injection valve.

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

[0097] Step 41: Determine the ignition cylinder according to the current ignition timing of the engine.

[0098] Step 42: Determine the target injection valve according to the position of the ignition cylinder, and regard the target injection valve as the first injection valve to perform injection operations according to the partial injection mode.

[0099] Specifically, the ignition of the cylinder also has a corresponding relationship with the crankshaft angle. Within one working cycle of the engine (the crankshaft rotates 720 degrees), each cylinder is ignited once. The cylinder to be ignited can be determined according to the current crankshaft angle, and then the corresponding target injection valve of this cylinder is regarded as the first injection valve and injection operations are performed according to the partial injection mode.

[0100] As a specific application of the above injection valve control method, refer to Figure 2 As shown, the injection valve control method may include the following processing procedures:

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

[0102] Calculate the continuous injection angle of the injection valve according to the engine speed and the continuous injection time of the injection valve under the current working condition.

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

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

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

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

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

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

[0109] It can be understood that considering that both the opening and closing of the injection valve take time, and at the same time to prevent the injection valve from overheating or aging due to long-term continuous injection, generally the maximum continuous angle of the continuous injection angle of the injection valve will be less than one working cycle (720 degrees), for example, the maximum is 700 degrees. Those skilled in the art can select and set according to actual needs, and no limitation is made here.

[0110] The above introduces a kind of injection valve control method provided by the embodiments of the present application. The following will introduce the device for executing the above injection valve control method.

[0111] Please refer to Figure 3 , Figure 3 which is a schematic structural diagram of an injection valve control device provided by the embodiments of the present application. As Figure 3 shown, the injection valve control device includes:

[0112] An execution strategy determination module 301 is configured to determine an injection valve execution strategy according to the current operating condition of the engine.

[0113] An injection valve state allocation module 302 is configured to determine a first quantity of first injection valves, a second quantity of second injection valves, and an injection mode for each first injection valve according to the injection valve execution strategy. The first injection valves are the injection valves to be started, and the second injection valves are the injection valves not to be started. The injection mode is: a continuous injection mode or a partial injection mode. The continuous injection mode indicates continuous injection during one working cycle of the engine, and the partial injection mode indicates continuous injection during a partial cycle of one working cycle. The sum of the first quantity and the second quantity is the quantity of all injection valves.

[0114] An injection valve control module 303 is configured to select a first quantity of first injection valves from all injection valves and control each first injection valve to perform an injection operation according to the corresponding injection mode.

[0115] In a possible implementation, the process by which the execution strategy determination module 301 determines the injection valve execution strategy according to the current operating condition of the engine includes:

[0116] Obtain an injection valve execution strategy corresponding to the interval range according to the interval range where the continuous injection value of a single injection valve is located. The continuous injection value represents the angle or duration of continuous injection of a single injection valve during one working cycle.

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

[0118] Determine a first quantity of first injection valves from a first injection valve calibration chart according to the continuous injection value and the natural gas pressure, and determine each first injection valve as the partial injection mode;

[0119] Regard the injection valves other than the first injection valves among all injection valves 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 determination module 301 further includes:

[0121] Determine the continuous injection value corresponding to the partial injection mode according to the total continuous injection value and the first quantity. The total continuous injection value is the sum of the continuous injection values of all injection valves.

[0122] In a possible implementation, if the continuous injection value is within 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, then the second injection valve execution strategy corresponding to the second interval range in the execution strategy determination module 301 is executed, including:

[0123] Determine a third quantity of first injection valves according to the number of working cycle values included in the total continuous injection value, and determine each of the third quantity of first injection valves as a continuous injection mode, where 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 duration of one working cycle;

[0124] Determine a fourth quantity of first injection valves from the second injection valve calibration diagram according to the continuous injection value and the natural gas pressure, and determine each of the fourth quantity of first injection valves as a partial injection mode;

[0125] Regard the injection valves other than the first injection valves among all injection valves 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:

[0127] Determine the continuous injection value corresponding to the partial injection mode according to the continuous injection difference and the fourth quantity, where the continuous injection difference 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 within the third interval range, and the minimum value of the third interval range is the second continuous injection value, then the third injection valve execution strategy corresponding to the third interval range in the execution strategy determination module 301 is executed, including:

[0129] Regard all injection valves as first injection valves, and determine each first injection valve as a partial injection mode.

[0130] In a possible implementation, when the first injection valve is in the partial injection mode, the process of the injection valve control module 303 controlling each first injection valve to perform injection operations according to the corresponding injection mode includes:

[0131] Determine the ignition cylinder according to the current ignition timing of the engine;

[0132] Determine the target injection valve according to the position of the ignition cylinder, and use the target injection valve as the first injection valve to perform injection operations according to the partial injection mode.

[0133] This application embodiment also provides an injection valve control device. Refer to Figure 4As shown, it shows a schematic structural diagram of a jet valve control device suitable for implementing the jet valve control device in the embodiments of the present application. The jet valve control device in the embodiments of the present application may include, but is not limited to, such as an ECU (Electronic Control Unit), a VCU (Vehicle Control Unit), an MCU (Micro Controller Unit), an HCU (Hybrid Control Unit), etc. Figure 4 The shown jet valve control device is merely an example and should not impose any limitations on the functions and scope of use of the embodiments of the present application.

[0134] As Figure 4 shown, the jet valve control device may include a processing device (such as a central processing unit, a graphics processing unit, etc.) 401, which may 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 jet valve control device is powered on, various programs and data required for the operation of the jet valve control device are also stored in the RAM 403. The processing device 401, the ROM 402, and the RAM 403 are connected to each other through a bus 404. An input / output (I / O) interface 405 is also connected to the bus 404.

[0135] Generally, the following devices may be connected to the I / O interface 405: an input device 406 including, for example, a touch screen, a touchpad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 407 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 408 including, for example, a memory card, a hard disk, etc.; and a communication device 409. The communication device 409 may allow the jet valve control device to communicate with other devices wirelessly or wiredly to exchange data. Although Figure 4 shown is a jet valve control device having various devices, it should be understood that it is not required to implement or have all the shown devices. More or fewer devices may be alternatively implemented or had.

[0136] The embodiments of the present application also provide a vehicle, including the jet valve control device as described in the above embodiments.

[0137] The embodiments of the present application also provide a computer program product, including computer-readable instructions, which, when running on an electronic device, cause the electronic device to implement any one of the jet valve control methods provided by the embodiments of the present application.

[0138] In an embodiment of the present application, a computer-readable storage medium is further provided. 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 implement any of the injection valve control methods provided in the embodiments of the present application.

[0139] In addition, it should be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the attached drawings of the device embodiments provided in the present application, the connection relationship between the modules indicates that they have a communication connection, which can be specifically 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 implemented by means of software plus necessary general hardware, and of course, it can also be implemented by dedicated hardware including application-specific integrated circuits, dedicated CPUs, dedicated memories, dedicated components, etc. Generally, functions completed by computer programs can be easily implemented by corresponding hardware, and the specific hardware structures for implementing the same function can also be various, such as analog circuits, digital circuits or dedicated circuits. However, for the present application, in more cases, software program implementation is a better implementation method. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a readable storage medium, such as a floppy disk, USB flash drive, mobile hard disk, ROM, RAM, magnetic disk or optical disc of a computer, and includes several instructions for causing a computer device (which can be a personal computer, training device, or network device, etc.) to execute the methods described in the various embodiments of the present application.

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

[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 wholly or partially generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, training device, or data center to another website, computer, training device, or data center by wire (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wirelessly (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a training device or a data center that includes one or more integrated available media. The available medium may be a magnetic medium (such as a floppy disk, a hard disk, a magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (SSD)), etc.

Claims

1. A method for controlling an injection valve, characterized in that: include: Determine the injection valve execution strategy according to the current operating conditions of the engine; 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 of the first injection valves are determined, the first injection valve is an injection valve to be started, the second injection valve is an injection valve not to be started, the injection mode is: a continuous injection mode or a partial injection mode, the continuous injection mode represents continuous injection in a working cycle of the engine, the partial injection mode represents continuous injection during a partial cycle of the working cycle, and the sum of the first number and the second number is the number of all injection valves; The first number of first injection valves are selected from the entire injection valves, and each of the first injection valves is controlled to perform an injection operation according to a corresponding injection mode.

2. The injection valve control method according to claim 1, characterized in that: Determining the injection valve execution strategy according to the current operating condition of the engine includes: The injection valve execution strategy corresponding to the interval range is obtained according to the interval range of the continuous injection value of the single injection valve, wherein the continuous injection value represents the angle or duration of continuous injection of the single injection valve in the one working cycle.

3. The injection valve control method according to claim 2, characterized in that: If the continuous injection value is within a first interval, and the maximum value of the first interval is a first continuous injection value, then the first injection valve execution strategy corresponding to the first interval includes: determining the first number of first injection valves from a first injection valve calibration map according to the continuous injection value and the natural gas pressure, and determining each of the first injection valves to be in the partial injection mode; The injection valves other than the first injection valve among all the injection valves are used as the second injection valve.

4. The injection valve control method according to claim 3, characterized in that: The first injection valve execution strategy corresponding to the first interval range further includes: The continuous injection value corresponding to the partial injection mode is determined according to the total continuous injection value and the first number, wherein the total continuous injection value is the sum of the continuous injection values ​​of all the injection valves.

5. The injection valve control method according to claim 2, characterized in that: If the continuous injection value is within a second interval, and the minimum value of the second interval is a first continuous injection value, and the maximum value of the second interval is a second continuous injection value, then the second injection valve execution strategy corresponding to the second interval includes: Determine a third number of first injection valves according to the number of working cycle values ​​included in the total continuous injection value, and determine each of the third number of first injection valves as the continuous injection mode, the total continuous injection value is the sum of the continuous injection values ​​of all the injection valves, and the working cycle value is an angle or duration of the working cycle; determining a fourth number of first injection valves from a second injection valve calibration map according to the continuous injection value and the natural gas pressure, and determining each of the first injection valves in the fourth number of first injection valves to be in the partial injection mode; The injection valves other than the first injection valve among all the injection valves are used as the second injection valve.

6. The injection valve control method according to claim 5, characterized in that: The second injection valve execution strategy corresponding to the second interval range further includes: The continuous injection value corresponding to the partial injection mode is determined according to the continuous injection difference and the fourth quantity, wherein the continuous injection difference 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.

7. The injection valve control method according to claim 2, characterized in that: If the continuous injection value is within a third interval, and the minimum value of the third interval is a second continuous injection value, then the third injection valve execution strategy corresponding to the third interval includes: All the injection valves are used as the first injection valves, and each of the first injection valves is set to the partial injection mode.

8. The injection valve control method according to any one of claims 1 to 7, characterized in that: When the first injection valve is in the partial injection mode, controlling each of the first injection valves to perform an injection operation according to a corresponding injection mode includes: Determining an ignition cylinder according to a current ignition timing of the engine; A target injection valve is determined according to the position of the firing cylinder, and the injection operation is performed in the partial injection mode using the target injection valve as the first injection valve.

9. An injection valve control device, characterized in that: The method comprises at least one processor and a memory connected to the processor, wherein: The memory is used to store computer programs; The processor is configured to execute the computer program so that the injection valve control device can implement the injection valve control method according to any one of claims 1 to 8.

10. A vehicle, characterized in that: include: The injection valve control device as claimed in claim 9.

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