A method, device and equipment for controlling an injection valve and a vehicle

Abstract

The application provides a kind of injection valve control method, device, equipment and car, scheme is obtained after the fuel demand total amount of engine, by comparing the fuel demand total amount of engine with preset threshold value, when fuel demand total amount is less than the preset threshold value, obtain the injection valve opening number matched with the fuel demand total amount calibrated in advance, the injection valve opening number is recorded as target number, then by all injection valve select target number of injection valve to execute this fuel injection operation, so that the starting time of each injection valve is greater than the minimum time of injection valve stable opening, at this time injection valve can accurately provide the required fuel demand total amount, compared with prior art, when fuel demand total amount is too small, the actual fuel amount provided by injection valve is too large, and the problem of engine speed fluctuation is too large, the application can accurately provide fuel amount for engine, so that engine runs stably.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and more specifically to an injection valve control method, device, equipment, and automobile. Background Technology

[0002] Natural gas engines typically employ a single-point injection system via the intake manifold. All injection valves inject fuel into the manifold, which then mixes with air before entering each cylinder for combustion and power generation. For high-horsepower engines, high-flow-rate injection valves are used to meet the maximum load requirements. However, under low load conditions, especially low idle speeds, the required fuel injection volume is very small. When distributed to each injection valve, the valve's opening time is less than the minimum stable opening time. This results in a fuel injection volume exceeding the required volume, causing the engine's actual speed to be higher than the set speed. Alternatively, the injection volume at each valve may be at the minimum opening threshold, leading to unstable flow control and engine speed fluctuations. These issues affect the engine's fuel consumption and stability. Summary of the Invention

[0003] In view of this, embodiments of the present invention provide an injection valve control method, apparatus, device, and automobile to achieve stable control of the injection flow rate of the injection valve and improve engine stability.

[0004] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0005] A method for controlling an injection valve, comprising:

[0006] Obtain the total engine fuel requirement;

[0007] Determine whether the total fuel demand exceeds a preset threshold;

[0008] When the total fuel demand is less than the preset threshold, obtain the number of injection valves opened that matches the total fuel demand, and record it as the target number.

[0009] Select the target number of injection valves from all injection valves to perform fuel injection operations.

[0010] Optionally, in the above injection valve control method, selecting a target number of injection valves from all injection valves to perform fuel injection operations includes:

[0011] The target number of injection valves are selected from all injection valves in normal condition to perform fuel injection operations, and the opening time of each selected injection valve is the same.

[0012] Optionally, in the above injection valve control method, the preset threshold is greater than X1, and X1 = N1 × X0 × T;

[0013] Wherein, N1 is the total number of injection valves, X0 is the injection volume of a single injection valve per unit time, and T is the minimum time for the injection valve to be stably open.

[0014] Optionally, in the above injection valve control method, the preset threshold is greater than X2, where X2 = N2 × X0 × T;

[0015] Wherein, N2 is the total number of injection valves in normal condition, X0 is the injection volume of a single injection valve per unit time, and T is the minimum time for the injection valve to be stably open.

[0016] Optionally, in the above injection valve control method, obtaining the number of injection valves opened that matches the total fuel demand includes:

[0017] Obtain the number of injection valves to be opened that matches the total fuel demand and natural gas pressure.

[0018] Optionally, in the above injection valve control method, when the total fuel demand is not less than the preset threshold, the injection valve is controlled to enter the full injection mode.

[0019] Optionally, the above injection valve control method further includes, before obtaining the total engine fuel demand, the following:

[0020] Determine whether the engine is in the starting phase. If the engine is not in the starting phase, continue execution.

[0021] A jet valve control device, comprising:

[0022] Total demand acquisition unit is used to obtain the total engine fuel demand;

[0023] The injection mode selection unit is used to determine whether the total fuel demand is greater than a preset threshold; when the total fuel demand is less than the preset threshold, the number of injection valves opened that matches the total fuel demand is obtained and recorded as the target number.

[0024] The injection control unit is used to select a target number of injection valves from all injection valves to perform fuel injection operations.

[0025] A jet valve control device includes: a memory and a processor;

[0026] The memory is used to store programs;

[0027] The processor is configured to execute the program to implement each step of the injection valve control method described above.

[0028] An automobile includes the aforementioned injection valve control device.

[0029] As can be seen from the above technical solution description, after obtaining the total fuel demand of the engine, the above solution compares the total fuel demand of the engine with a preset threshold. When the total fuel demand is less than the preset threshold, it obtains a pre-calibrated number of injection valves that match the total fuel demand and records this number of injection valves as the target number. Then, it selects the target number of injection valves from all injection valves to perform this fuel injection operation, so that the start duration of each injection valve is greater than the minimum time for the injection valve to be stably open. At this time, the injection valve can accurately provide the required total fuel demand. Compared with the prior art, when the total fuel demand is too small, the actual amount of fuel provided by the injection valve is too large, resulting in excessive fluctuations in engine speed, this application can accurately provide the amount of fuel to the engine, thereby enabling the engine to operate stably. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0031] Figure 1 This is a schematic flowchart of the injection valve control method disclosed in the embodiments of this application;

[0032] Figure 2 This is a schematic flowchart of a jet valve control method disclosed in another embodiment of this application;

[0033] Figure 3 This is a schematic diagram of the structure of the injection valve control device disclosed in the embodiments of this application;

[0034] Figure 4 This is a schematic diagram of the structure of the injection valve control device disclosed in the embodiments of this application. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In this solution, to prevent the injection valves from supplying excessive fuel to the engine when the engine's fuel demand is too low, an injection valve control method is provided. This method reduces the number of injection valves used to supply fuel when the engine's fuel demand is low, ensuring that the fuel injection duration of each injection valve is greater than the minimum time for the injection valve to be stably open, thereby enabling the engine to accurately supply the required amount of fuel.

[0037] For details, see Figure 1 This application discloses a method for controlling an injection valve, which may include:

[0038] Step S101: Obtain the total engine fuel requirement.

[0039] In this step, the total fuel requirement of the engine can be obtained based on the engine's status and operating data or other parameters. This total fuel requirement can also be obtained directly through the engine controller.

[0040] Step S102: Determine whether the total fuel demand is greater than a preset threshold.

[0041] In this solution, a preset threshold is set in advance. The size of this preset threshold can be set by the user according to their needs. It can be pre-written into the engine control system, as long as it is greater than the minimum amount of fuel that can be accurately provided by a conventional injection valve control scheme.

[0042] For example, assuming a preset threshold is greater than X1, that is, when the total fuel demand is greater than X1, a conventional injection valve control scheme can control the injection valve to accurately provide the required fuel quantity. When the total fuel demand is less than or equal to X1, a conventional injection valve control scheme cannot control the injection valve to accurately provide the required fuel quantity. Here, X1 = N1 × X0 × T, where N1 is the total number of injection valves, X0 is the injection quantity per unit time of a single injection valve, the unit time is the duration of one engine working cycle (two crankshaft revolutions (720 degrees) constitute one working cycle, with one cylinder working once), and T is the minimum time for the injection valve to stably open. When the injection valve opening time is less than T, the injection valve struggles to provide a stable fuel injection quantity; when the injection valve opening time is greater than T, the injection valve can provide a stable fuel injection quantity.

[0043] Furthermore, considering that the injection valves may malfunction for various reasons, causing them to be unable to inject fuel, these injection valves are not considered in conventional injection valve control schemes. Therefore, the specific value of the preset threshold can be configured to be greater than X2, where X2 = N2 × X0 × T, N2 is the total number of injection valves in normal condition, which refers to injection valves that can inject fuel normally, X0 is the injection amount per unit time of a single injection valve, and T is the minimum time for the injection valve to be stably open.

[0044] Step S103: When the total fuel demand is less than the preset threshold, obtain the number of injection valves that match the total fuel demand, and record it as the target number.

[0045] In this step, when the total fuel demand is less than the preset threshold, it indicates that the conventional injection valve control scheme cannot control the injection valve to accurately provide the required amount of fuel. At this time, it is necessary to use the scheme disclosed in the embodiments of this application to control the injection valve. In this embodiment, the opening time of the injection valve for providing fuel can be increased by reducing the number of injection valves used to provide fuel, so that the injection valve can accurately provide the required amount of fuel.

[0046] In this embodiment, the correspondence between the total fuel demand and the number of injection valves opened when the total fuel demand is less than a preset threshold can be pre-configured. Different total fuel demand corresponds to different number of injection valves opened. This correspondence is pre-stored in the corresponding mapping table. When the total fuel demand is less than the preset threshold, the corresponding number of injection valves opened can be directly obtained from the mapping table and recorded as the target number.

[0047] When the total fuel demand is not less than the preset threshold, the injection valve is controlled to enter the full injection mode. In the full injection mode, the opening time of each injection valve is not less than the minimum critical opening time.

[0048] Step S104: Select the target number of injection valves from all injection valves to perform fuel injection.

[0049] Once the target quantity is determined, a target number of injection valves are selected from all injection valves based on a preset injection valve selection principle to perform fuel injection operations, thereby providing the engine with the required total fuel demand. At this time, because the number of injection valves used to provide the total fuel demand is reduced, the opening duration of each injection valve is greater than the minimum stable opening time of the injection valve, thus enabling the injection valves to accurately provide the required total fuel demand.

[0050] As can be seen from the above scheme, the above scheme compares the total fuel demand of the engine with a preset threshold. When the total fuel demand is less than the preset threshold, the number of injection valves that are pre-calibrated and match the total fuel demand is obtained and recorded as the target number. Then, the target number of injection valves are selected from all injection valves to perform this fuel injection operation, so that the start time of each injection valve is greater than the minimum time for the injection valve to be stably opened. At this time, the injection valve can accurately provide the required total fuel demand.

[0051] In this embodiment, see Figure 2 Considering that the total fuel demand of the engine is relatively large during the engine start-up phase, and will inevitably exceed a preset threshold, the process before obtaining the total engine fuel demand also includes: determining whether the engine is in the start-up phase; if the engine is not in the start-up phase, continuing the process; if the engine is in the start-up phase, controlling the injection mode of the injection valves to full injection mode. For example, in this embodiment, when the vehicle ECU is powered on, the engine enters the start-up phase. Since the engine needs to overcome friction and requires a large amount of fuel injection during start-up, the total fuel demand exceeds the preset threshold. Therefore, all injection valves need to participate in the start-up phase. Thus, the ECU defaults to setting the injection mode to full injection mode when powered on, and in full injection mode, all injection valves are in operation. Furthermore, considering that injection valves in a faulty state may have difficulty performing fuel injection, relevant engine operating data can be acquired to determine whether an injection valve is in a faulty state and the total number of injection valves in a faulty state. If any injection valve is in a faulty state, the control mode of the injection valve can be switched to fault mode. In fault mode, the injection valves in normal state can be controlled to maintain full injection. At this time, the injection quantity A1 of each normal injection valve can be calculated based on the current number of remaining normal injection valves and the total fuel demand under the current operating conditions. A1 is the ratio of the total fuel demand to the number of injection valves in normal state, and the starting injection interval angle of each injection valve is the ratio of 720° to the number of injection valves in normal state. In this scheme, the interval angle of being in the open state is the ratio of 720° to the number of injection valves to be opened.

[0052] In this embodiment, see Figure 2Considering that the total fuel demand of the engine is relatively small when it is idling, and is necessarily less than a preset threshold, if the injection valves are kept in full injection mode, the injection opening time of a single injection valve in operation is less than the minimum critical opening time or at the critical point. If all injection valves are injecting normally, the injection valves cannot accurately control the injection quantity, or even if the injection valves are controlled according to the minimum injection quantity, the actual injection quantity will exceed the total fuel demand, resulting in unstable engine control or an engine speed higher than the preset idle speed. Therefore, in this solution, if the engine is in idling mode, there is no need to perform the action "determine whether the total fuel demand is greater than the preset threshold"; instead, the action "obtain the number of injection valves opening that matches the total fuel demand, and record it as the target number" can be directly performed.

[0053] See Figure 2 If the engine is under load, the load level determines the total fuel demand of the engine. At this time, it is necessary to determine whether the total fuel demand exceeds a preset threshold. Therefore, the above... Figure 1 The technical solutions disclosed in the corresponding complete embodiments can be applied to engines under load.

[0054] In this embodiment, when a target number of injection valves are selected from all injection valves to perform fuel injection, if a selected injection valve is faulty, it cannot perform the injection operation, resulting in a less than the total fuel demand. Therefore, the above solution specifically includes selecting the target number of injection valves from all normally functioning injection valves to perform fuel injection, with each selected valve having the same opening time. In this case, all selected injection valves are functioning normally, ensuring that they accurately deliver the total fuel demand, guaranteeing engine control stability, and improving engine power.

[0055] In the technical solution disclosed in this embodiment, considering that the amount of fuel that the injection valve can inject within a unit time is also related to the natural gas pressure—the higher the natural gas pressure, the greater the amount of fuel the injection valve can provide within a unit time—when calculating the number of injection valves to be opened, in addition to considering the total fuel demand, the natural gas pressure also needs to be considered. For example, in this solution, a preset MAP can be constructed in advance to store the total fuel demand, natural gas pressure, and the number of injection valves to be opened. After obtaining the total fuel demand and natural gas pressure, the number of injection valves to be opened can be determined by looking up the preset MAP. Therefore, in the above solution, obtaining the number of injection valves to be opened that matches the total fuel demand includes: obtaining the number of injection valves to be opened that matches the total fuel demand and the natural gas pressure.

[0056] This embodiment discloses an injection valve control device. For the specific working content of each unit in the device, please refer to the above method embodiment.

[0057] The injection valve control device provided in the embodiments of the present invention is described below. The injection valve control device described below can be referred to in correspondence with the injection valve control method described above.

[0058] See Figure 3 The injection valve control device disclosed in this embodiment may include:

[0059] Total demand acquisition unit 10 is used to acquire the total engine fuel demand;

[0060] Injection mode selection unit 20 is used to determine whether the total fuel demand is greater than a preset threshold; when the total fuel demand is less than the preset threshold, the number of injection valves opened that matches the total fuel demand is obtained and recorded as the target number.

[0061] The injection control unit 30 is used to select a target number of injection valves from all injection valves to perform fuel injection operations.

[0062] The specific working process of the total demand acquisition unit 10, the injection mode selection unit 20, and the injection control unit 30 is shown in the above method embodiment, and will not be repeated here.

[0063] With the above Figure 2Corresponding to the implementation scheme of the corresponding injection valve control method, the injection valve control device disclosed in this application embodiment may further include an engine state judgment unit. The engine state judgment unit is used to control the injection valve to enter the fully open mode when it is determined that the engine is in the starting stage. If the engine is not in the starting stage, it continues to judge whether the engine is in the idling stage. If the engine is in the idling stage, the trigger injection mode selection unit 20 is triggered to skip the action of "judging whether the total fuel demand is greater than the preset threshold; when the total fuel demand is less than the preset threshold", and directly executes the action: obtaining the number of injection valves opened that matches the total fuel demand, and recording it as the target number.

[0064] Figure 4 This is a hardware structure diagram of the injection valve control device provided in an embodiment of the present invention. The injection valve control device can be integrated into the vehicle controller. See [link / reference]. Figure 4 As shown, it may include: at least one processor 100, at least one communication interface 200, at least one memory 300 and at least one communication bus 400;

[0065] In this embodiment of the invention, the number of processor 100, communication interface 200, memory 300, and communication bus 400 is at least one, and the processor 100, communication interface 200, and memory 300 communicate with each other through communication bus 400; obviously, Figure 4 The communication connections shown for the processor 100, communication interface 200, memory 300, and communication bus 400 are optional.

[0066] Optionally, the communication interface 200 can be an interface of a communication module, such as the interface of a GSM module;

[0067] Processor 100 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.

[0068] The memory 300 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0069] Specifically, the processor 100 is used to execute various steps of the injection valve control method disclosed in any of the above embodiments of this application. For example, the processor is used to execute:

[0070] Obtain the total engine fuel requirement;

[0071] Determine whether the total fuel demand exceeds a preset threshold;

[0072] When the total fuel demand is less than the preset threshold, obtain the number of injection valves opened that matches the total fuel demand, and record it as the target number.

[0073] Select the target number of injection valves from all injection valves to perform fuel injection operations.

[0074] Corresponding to the above-described device, this application also discloses a vehicle that uses the above-described device, which can use the injection valve control device disclosed in the above embodiments.

[0075] As can be seen from the above solutions, this application, without altering the mechanical configuration of automotive system components, can flexibly implement the aforementioned solutions through software configuration. By adaptively selecting different numbers of injection valves to perform injection operations based on varying total fuel demands of the engine, it solves the problem of unstable engine speed and load caused by uncontrollable injection flow due to the injection valve flow being at the minimum injection flow threshold under idling and low-load conditions. This patented method improves the robustness and reliability of engine injection valve and speed control.

[0076] For ease of description, the above system is described by dividing it into various modules based on their functions. Of course, in implementing this invention, the functions of each module can be implemented in one or more software and / or hardware components.

[0077] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0078] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0079] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0080] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0081] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for controlling an injection valve, characterized in that, include: Obtain the total engine fuel requirement; Determine whether the total fuel demand is greater than a preset threshold, where the preset threshold is greater than X1, and X1 = N1 × X0 × T; where N1 is the total number of injection valves, X0 is the injection amount per unit time of a single injection valve, and T is the minimum time for the injection valve to open stably. When the total fuel demand is less than the preset threshold, obtain the number of injection valves that are pre-calibrated and match the total fuel demand, and record it as the target number; Select the target number of injection valves from all injection valves to perform fuel injection operations.

2. The injection valve control method according to claim 1, characterized in that, The preset threshold is greater than X2, where X2 = N2 × X0 × T; where N2 is the total number of injection valves in normal condition, X0 is the injection volume of a single injection valve per unit time, and T is the minimum time for the injection valve to open stably. Selecting a target number of injection valves from all injection valves to perform fuel injection operations includes: The target number of injection valves are selected from all injection valves in normal condition to perform fuel injection operations, and the opening time of each selected injection valve is the same.

3. The injection valve control method according to claim 1, characterized in that, Obtaining a pre-calibrated number of injection valves open that matches the total fuel demand includes: Obtain the number of injection valves to be opened that matches the total fuel demand and natural gas pressure.

4. The injection valve control method according to claim 1, characterized in that, When the total fuel demand is not less than the preset threshold, the injection valve is controlled to enter full injection mode.

5. The injection valve control method according to claim 1, characterized in that, Before obtaining the total engine fuel requirement, the following steps are also included: Determine whether the engine is in the start-up phase. If the engine is not in the start-up phase, continue execution.

6. A jet valve control device, characterized in that, include: Total demand acquisition unit is used to obtain the total engine fuel demand; The injection mode selection unit is used to determine whether the total fuel demand is greater than a preset threshold, the preset threshold being greater than X1, where X1 = N1 × X0 × T; where N1 is the total number of injection valves, X0 is the injection amount per unit time of a single injection valve, and T is the minimum time for the injection valve to be stably open; when the total fuel demand is less than the preset threshold, the number of injection valves opened that matches the total fuel demand is obtained and recorded as the target number; The injection control unit is used to select a target number of injection valves from all injection valves to perform fuel injection operations.

7. A jet valve control device, characterized in that, include: Memory and processor; The memory is used to store programs; The processor is configured to execute the program to implement the various steps of the injection valve control method as described in any one of claims 1-5.

8. A car, characterized in that, Includes the injection valve control device as described in claim 7.

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