Metering valve eccentric wear control method, system and equipment and readable storage medium

Abstract

The invention discloses a metering valve eccentric wear control method, system and equipment and a readable storage medium, and relates to the field of diesel engine high-pressure common-rail fuel system control, in particular to the steps that a fuel metering valve is controlled to be driven at a preset first duty ratio; after the fuel oil metering valve is continuously driven for a preset first duration according to the first duty ratio, the fuel oil metering valve is controlled to be continuously driven for a preset second duration according to a preset second duty ratio, and the first duty ratio is larger than the second duty ratio; and the steps are repeatedly executed for preset times to prevent eccentric wear of the metering valve. The problem that eccentric wear of the fuel metering valve needs to be solved urgently at present can be prevented on the premise that cost is not increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of diesel engine high-pressure common rail fuel system control, in particular to a control method, system and device for metering valve eccentric wear and a readable storage medium. BACKGROUND

[0002] With the increasingly stringent emission regulations for diesel engines and the continuous improvement of engine performance requirements, the high-pressure common rail system has become the core technology for modern diesel engines to achieve high-precision fuel injection and low emissions. The fuel metering valve in the system, as a key executive component for rail pressure control, is responsible for accurately regulating the fuel flow into the high-pressure system, directly affecting the control effect of rail pressure, and thus having a profound impact on the emissions, performance and economy of the engine.

[0003] However, during the operation of the fuel metering valve, the valve core often slides at the same angle with high frequency, continuously bearing mechanical load in a single direction, resulting in more severe wear of the contact surface in that direction, which is known as eccentric wear. Eccentric wear not only affects the control accuracy of the fuel metering valve, but also makes the rail pressure control unstable, thereby affecting the running performance and fuel consumption of the engine. In addition, eccentric wear also adversely affects the service life of the fuel metering valve, increasing the frequency of maintenance and replacement.

[0004] In existing methods, the fuel metering valve mechanical structure is improved to reduce wear, but this method will increase costs. Therefore, how to prevent eccentric wear of the fuel metering valve without increasing costs is a problem that needs to be solved urgently. SUMMARY

[0005] The present application provides a control method, system and device for metering valve eccentric wear and a readable storage medium, which can prevent eccentric wear of the fuel metering valve without increasing costs.

[0006] In a first aspect, the present application provides a control method for metering valve eccentric wear, which comprises: controlling the fuel metering valve to be driven at a preset first duty cycle; after the fuel metering valve is continuously driven at the first duty cycle for a preset first duration, controlling the fuel metering valve to be continuously driven at a preset second duty cycle for a preset second duration, the first duty cycle being greater than the second duty cycle; repeating the above steps for a preset number of times to prevent eccentric wear of the metering valve.

[0007] In combination with the first aspect, in an implementation manner, before the step of controlling the fuel metering valve to be driven at a preset first duty cycle, the method further comprises: freezing the current closed-loop control function of the fuel metering valve when detecting an engine shutdown instruction and the ECU is in a power-off state.

[0008] In conjunction with the first aspect, in one embodiment, the current closed-loop control function of the frozen fuel metering valve includes: The ECU stops adjusting the duty cycle based on the deviation between the preset drive current and the real-time drive current.

[0009] In conjunction with the first aspect, in one embodiment, after the step of repeating the above steps a preset number of times, the method further includes: Disable the current closed-loop control function of the fuel metering valve and use the duty cycle calculated based on the current closed-loop control function as the drive duty cycle. The fuel metering valve is driven by the drive signal corresponding to the drive duty cycle.

[0010] In conjunction with the first aspect, in one embodiment, the first duty cycle is determined based on real-time fuel temperature, real-time voltage, and a preset mapping table between fuel temperature, voltage, and duty cycle.

[0011] Secondly, embodiments of this application provide a control system for the wear of a metering valve, the control system for the wear of a metering valve comprising: The first processing module is used to control the fuel metering valve to be driven at a preset first duty cycle; The second processing module is used to control the fuel metering valve to be driven continuously for a preset second time at a preset second duty cycle after the fuel metering valve has been driven continuously for a preset first time at a first duty cycle, wherein the first duty cycle is greater than the second duty cycle. The third processing module is used to repeat the above steps a preset number of times to prevent the metering valve from wearing out.

[0012] In conjunction with the second aspect, in one implementation, the processing module is specifically used for: When an engine stop command is detected and the ECU is powered down, the current closed-loop control function of the fuel metering valve is frozen.

[0013] In conjunction with the second aspect, in one implementation, the processing module is further configured to: The ECU stops adjusting the duty cycle based on the deviation between the preset drive current and the real-time drive current.

[0014] Thirdly, embodiments of this application provide a control device for metering valve wear, the control device for metering valve wear includes a processor, a memory, and a control program for metering valve wear stored in the memory and executable by the processor, wherein when the control program for metering valve wear is executed by the processor, it implements the steps of the control method for metering valve wear as described in any of the preceding claims.

[0015] Fourthly, embodiments of this application provide a computer-readable storage medium storing a control program for metering valve wear, wherein when the control program for metering valve wear is executed by a processor, it implements the steps of the control method for metering valve wear as described in any of the preceding claims.

[0016] The beneficial effects of the technical solutions provided in this application include: By controlling the fuel metering valve to drive it at a preset first duty cycle to achieve a relatively small opening; after the fuel metering valve continues to drive at the first duty cycle for a preset first duration, the fuel metering valve is controlled to drive at a preset second duty cycle for a preset second duration to achieve a relatively large opening, wherein the first duty cycle is greater than the second duty cycle; the above steps are repeated a preset number of times, that is, by driving the fuel metering unit to repeatedly and rapidly switch between large and small openings, the valve core of the metering valve rotates, thereby making the wear of the valve core more uniform in all directions, so as to prevent uneven wear of the metering valve; and this application does not require changing the mechanical structure of the fuel metering valve, and can reduce the wear of the fuel metering unit by relying on the original configuration of the engine to complete the above control strategy, without causing an increase in cost. Attached Figure Description

[0017] Figure 1 This is a schematic flowchart of an embodiment of the control method for uneven wear of the metering valve in this application; Figure 2 This is a flowchart illustrating the control strategy in an embodiment of the control method for controlling uneven wear of the metering valve in this application. Figure 3 This is a functional module diagram of an embodiment of the control system for the metering valve wear of this application; Figure 4 This is a schematic diagram of the hardware structure of the control device for the metering valve wear involved in the embodiments of this application. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0020] In a first aspect, embodiments of this application provide a method for controlling the wear of a metering valve.

[0021] In one embodiment, reference is made to Figure 1 , Figure 1 This is a schematic flowchart illustrating an embodiment of the control method for uneven wear of the metering valve in this application. Figure 1 As shown, the control method for uneven wear of the metering valve includes: Step S10: Control the fuel metering valve to drive it at a preset first duty cycle.

[0022] In this embodiment, as an example, the duty cycle refers to the proportion of the signal being high-level within one cycle to the total cycle duration. It directly determines the average voltage applied to the fuel metering valve and controls the magnitude of the drive current through pulse width modulation (PWM). The preset first duty cycle can be determined by consulting a calibrated MAP (Manifold Absolute Pressure) gauge, which is not limited here. Specifically, the fuel metering valve (fuel metering unit) operates with a smaller valve opening when driven by a larger duty cycle and a larger valve opening when driven by a smaller duty cycle. By controlling the fuel metering valve to be driven with a larger first duty cycle, the larger first duty cycle means a higher average voltage applied to the fuel metering valve and a larger drive current, resulting in a relatively smaller opening of the fuel metering valve, thereby enabling relatively small opening adjustment.

[0023] Step S20: After the fuel metering valve is continuously driven at a first duty cycle for a preset first duration, control the fuel metering valve to be continuously driven at a preset second duty cycle for a preset second duration, wherein the first duty cycle is greater than the second duty cycle.

[0024] In this embodiment, the specific values ​​of the preset first duration and the preset second duration can be determined according to actual needs and are not limited here. For example, the preset first duration can preferably be 100ms. The specific value of the preset second duty cycle can be determined according to actual needs, as long as the first duty cycle is greater than the second duty cycle, and is not limited here. Specifically, after the control system drives the fuel metering valve with the first duty cycle and maintains it for the first duration, the opening of the fuel metering valve is smaller, and the fuel flow increases. Then, by controlling the fuel metering valve to drive the second duration with a smaller second duty cycle, the smaller second duty cycle means that the high level of the signal is shorter, and the applied average voltage and driving current are also reduced, resulting in a larger opening of the fuel metering valve, thereby achieving a relatively large opening adjustment. It should be noted that the above control strategy is convenient and simple to operate and has wide applicability.

[0025] Step S30: Repeat the above steps a preset number of times to prevent uneven wear of the metering valve.

[0026] As an example, in the embodiments of this application, due to objective manufacturing precision issues or design intent, the head of the fuel metering valve core is usually not a perfectly symmetrical cylinder. The force generated by the electromagnetic field will have a small component that does not pass through the valve core axis. This small force will form a torsional torque. By repeating the above steps a preset number of times, the fuel metering unit can be driven to switch repeatedly and at high frequency between small and large openings. This high-frequency changing torsional torque is sufficient to cause the valve core to produce a small rotational oscillation, ensuring that the valve core does not always contact the valve body at only one point, thereby preventing local wear of the fuel metering valve. The specific value of the preset number of times can be determined according to actual needs and is not limited here.

[0027] This application controls the fuel metering valve to be driven at a preset first duty cycle to achieve a relatively small opening. After the fuel metering valve is driven at the first duty cycle for a preset first duration, it is controlled to be driven at a preset second duty cycle for a preset second duration to achieve a relatively large opening. The first duty cycle is greater than the second duty cycle. The above steps are repeated a preset number of times. That is, by driving the fuel metering unit to repeatedly and rapidly switch between large and small openings, the valve core of the metering valve rotates, thereby making the wear of the valve core more uniform in all directions and preventing uneven wear of the metering valve. Moreover, this application does not require changing the mechanical structure of the fuel metering valve. The above control strategy can be implemented by relying only on the original configuration of the engine to reduce the wear of the fuel metering unit without increasing costs.

[0028] Furthermore, in one embodiment, prior to the step of controlling the fuel metering valve to be driven at a preset first duty cycle, the method further includes: When an engine stop command is detected and the ECU is powered down, the current closed-loop control function of the fuel metering valve is frozen.

[0029] In an exemplary embodiment of this application, when the system detects an engine shutdown command and the ECU is in a power-down state (Afterrun phase), the control signal will stop outputting, and the working state of the fuel metering valve cannot be adjusted. At this time, the current closed-loop control function can be frozen to prevent the fuel metering unit from still dynamically adjusting without a control signal, which could lead to abnormal operation of the fuel metering valve. The above operation ensures that the system remains stable in the non-working state after the engine is shut down, avoids fuel flow instability or abnormal changes due to the failure of the current closed-loop control, prevents the influence of duty cycle adjustment from adversely affecting the subsequent system start-up, and ensures that the engine can be restarted smoothly.

[0030] Furthermore, in one embodiment, the current closed-loop control function of the frozen fuel metering valve includes: The ECU stops adjusting the duty cycle based on the deviation between the preset drive current and the real-time drive current.

[0031] In an exemplary embodiment of this application, during normal operation, the ECU dynamically adjusts the duty cycle by comparing the deviation between the set drive current and the real-time measured drive current to ensure that the working state of the fuel metering valve matches the expected fuel flow. When the system enters a specific state (such as an engine shutdown command and the ECU is powered down), in order to avoid system instability or unnecessary adjustments caused by real-time adjustments, the ECU will stop adjusting the duty cycle in real time according to the current deviation. Instead, it will briefly drive the metering valve core to move, using the residual fuel pressure to push the oil flow to carry the settled particles away from the contact zone between the valve core and the valve seat of the metering valve. This control strategy avoids abrasive wear during the next startup.

[0032] Furthermore, in one embodiment, after repeating the above steps a preset number of times, the method further includes: Disable the current closed-loop control function of the fuel metering valve and use the duty cycle calculated based on the current closed-loop control function as the drive duty cycle. The fuel metering valve is driven by the drive signal corresponding to the drive duty cycle.

[0033] As an example, in this embodiment of the application, after repeating the above steps a preset number of times, the current closed-loop control function of the fuel metering valve is deactivated. At this time, the duty cycle calculated by the current closed-loop control function can be directly used as the driving duty cycle. Then, a driving signal is generated according to the driving duty cycle. This driving signal is transmitted to the fuel metering valve through current or pulse width modulation, thereby controlling the opening and closing degree of the valve and ultimately regulating the fuel flow.

[0034] Furthermore, in one embodiment, the first duty cycle is determined based on real-time fuel temperature, real-time voltage, and a preset mapping table between fuel temperature, voltage, and duty cycle.

[0035] As an example, in the embodiments of this application, the preset mapping table between fuel temperature, voltage and duty cycle can be obtained through experiments and is not limited here. For example, the duty cycle corresponding to fuel temperature x1 and voltage y1 is z1; the duty cycle corresponding to fuel temperature x2 and voltage y2 is z2; the duty cycle corresponding to fuel temperature x3 and voltage y3 is z3. The first duty cycle corresponding to the real-time fuel temperature and real-time voltage can be found from the preset mapping table between fuel temperature, voltage and duty cycle. Specifically, if the real-time fuel temperature is detected to be x2 and the real-time voltage is y2, then the corresponding first duty cycle can be determined to be z2.

[0036] It should be noted that, referring to Figure 2As shown, when an engine shutdown is detected and the ECU is powered down, the current closed-loop control function is frozen, and the fuel metering valve is driven with a first duty cycle. If the duration of driving the fuel metering valve with the first duty cycle reaches the first duration, the fuel metering valve is driven with a second duty cycle. If the duration of driving the fuel metering valve with the first duty cycle does not reach the first duration, the step of driving the fuel metering valve with the first duty cycle continues. If the duration of driving with the second duty cycle reaches the second duration, the above steps are repeated a preset number of times. If the duration of driving with the second duty cycle does not reach the second duration, the step of driving the fuel metering valve with the second duty cycle continues. If the above steps are repeated a preset number of times, the current closed-loop control function is deactivated. If the above steps are repeated a preset number of times, the step of driving the fuel metering valve with the first duty cycle continues.

[0037] Secondly, embodiments of this application also provide a control system for uneven wear of a metering valve.

[0038] In one embodiment, reference is made to Figure 3 , Figure 3 This is a functional module diagram of an embodiment of the control system for the metering valve wear of this application. Figure 3 As shown, the control system for uneven wear of the metering valve includes: The first processing module is used to control the fuel metering valve to be driven at a preset first duty cycle; The second processing module is used to control the fuel metering valve to be driven continuously for a preset second time at a preset second duty cycle after the fuel metering valve has been driven continuously for a preset first time at a first duty cycle, wherein the first duty cycle is greater than the second duty cycle. The third processing module is used to repeat the above steps a preset number of times to prevent the metering valve from wearing out.

[0039] Furthermore, in one embodiment, the first processing module is specifically used for: When an engine stop command is detected and the ECU is powered down, the current closed-loop control function of the fuel metering valve is frozen.

[0040] Furthermore, in one embodiment, the first processing module is specifically used for: The ECU stops adjusting the duty cycle based on the deviation between the preset drive current and the real-time drive current.

[0041] Furthermore, in one embodiment, the third processing module is specifically used for: Disable the current closed-loop control function of the fuel metering valve and use the duty cycle calculated based on the current closed-loop control function as the drive duty cycle. The fuel metering valve is driven by the drive signal corresponding to the drive duty cycle.

[0042] Furthermore, in one embodiment, the first processing module is specifically used for: The first duty cycle is determined based on real-time fuel temperature, real-time voltage, and a preset mapping table between fuel temperature, voltage, and duty cycle.

[0043] This application controls the fuel metering valve to be driven at a preset first duty cycle to achieve a relatively small opening. After the fuel metering valve is driven at the first duty cycle for a preset first duration, it is controlled to be driven at a preset second duty cycle for a preset second duration to achieve a relatively large opening. The first duty cycle is greater than the second duty cycle. The above steps are repeated a preset number of times. That is, by driving the fuel metering unit to repeatedly and rapidly switch between large and small openings, the valve core of the metering valve rotates, thereby making the wear of the valve core more uniform in all directions and preventing uneven wear of the metering valve. Moreover, this application does not require changing the mechanical structure of the fuel metering valve. The above control strategy can be implemented by relying only on the original configuration of the engine to reduce the wear of the fuel metering unit without increasing costs.

[0044] The functions of each module in the above-mentioned metering valve wear control system correspond to the steps in the above-mentioned metering valve wear control method embodiment, and their functions and implementation processes will not be described in detail here.

[0045] Thirdly, embodiments of this application provide a control device for the wear of a metering valve. The control device for the wear of a metering valve can be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0046] Reference Figure 4 , Figure 4 This is a schematic diagram of the hardware structure of the control device for metering valve wear in the embodiments of this application. In the embodiments of this application, the control device for metering valve wear may include a processor, a memory, a communication interface, and a communication bus.

[0047] The communication bus can be of any type and is used to interconnect the processor, memory, and communication interface.

[0048] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces used for interconnecting internal components of the control equipment for metering valve wear, as well as interfaces used for interconnecting the control equipment for metering valve wear with other devices (such as other computing devices or user equipment). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user equipment can be displays, keyboards, etc.

[0049] Memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0050] The processor can be a general-purpose processor, which can call the control program for metering valve wear stored in the memory and execute the control method for metering valve wear provided in the embodiments of this application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed when the control program for metering valve wear is called can be referred to in the various embodiments of the control method for metering valve wear of this application, and will not be repeated here.

[0051] Those skilled in the art will understand that Figure 4 The hardware structure shown does not constitute a limitation of this application and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0052] Fourthly, embodiments of this application also provide a readable storage medium.

[0053] The present application has a readable storage medium storing a control program for metering valve wear, wherein when the metering valve wear control program is executed by a processor, the steps of the metering valve wear control method described above are implemented.

[0054] The method implemented when the control program for the wear of the metering valve is executed can be referred to in various embodiments of the control method for the wear of the metering valve in this application, and will not be repeated here.

[0055] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0056] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0057] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0058] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0059] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0060] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0061] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for controlling the wear of a metering valve, characterized in that, The method for controlling the wear of the metering valve includes: The fuel metering valve is driven at a preset first duty cycle. After the fuel metering valve is continuously driven at a first duty cycle for a preset first duration, the fuel metering valve is controlled to be continuously driven at a preset second duty cycle for a preset second duration, wherein the first duty cycle is greater than the second duty cycle; Repeat the above steps a preset number of times to prevent uneven wear of the metering valve.

2. The method for controlling the wear of the metering valve as described in claim 1, characterized in that, Prior to the step of controlling the fuel metering valve to be driven at a preset first duty cycle, the method further includes: When an engine stop command is detected and the ECU is powered down, the current closed-loop control function of the fuel metering valve is frozen.

3. The method for controlling the wear of the metering valve as described in claim 2, characterized in that, The current closed-loop control function of the frozen fuel metering valve includes: The ECU stops adjusting the duty cycle based on the deviation between the preset drive current and the real-time drive current.

4. The method for controlling the wear of the metering valve as described in claim 1, characterized in that, After the step of repeating the above steps a preset number of times, the method further includes: Disable the current closed-loop control function of the fuel metering valve and use the duty cycle calculated based on the current closed-loop control function as the drive duty cycle. The fuel metering valve is driven by the drive signal corresponding to the drive duty cycle.

5. The method for controlling the wear of the metering valve as described in claim 1, characterized in that, The first duty cycle is determined based on real-time fuel temperature, real-time voltage, and a preset mapping table between fuel temperature, voltage, and duty cycle.

6. A control system for uneven wear of a metering valve, characterized in that, The control system for the wear of the metering valve includes: The first processing module is used to control the fuel metering valve to be driven at a preset first duty cycle; The second processing module is used to control the fuel metering valve to be driven continuously for a preset second time at a preset second duty cycle after the fuel metering valve has been driven continuously for a preset first time at a first duty cycle, wherein the first duty cycle is greater than the second duty cycle. The third processing module is used to repeat the above steps a preset number of times to prevent the metering valve from wearing out.

7. The control system for the wear of the metering valve as described in claim 6, characterized in that, The processing module is specifically used for: When an engine stop command is detected and the ECU is powered down, the current closed-loop control function of the fuel metering valve is frozen.

8. The control system for the wear of the metering valve as described in claim 6, characterized in that, The processing module is further specifically used for: The ECU stops adjusting the duty cycle based on the deviation between the preset drive current and the real-time drive current.

9. A control device for the wear of a metering valve, characterized in that, The control device for metering valve wear includes a processor, a memory, and a metering valve wear control program stored in the memory and executable by the processor, wherein when the metering valve wear control program is executed by the processor, it implements the steps of the metering valve wear control method as described in any one of claims 1 to 5.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a control program for metering valve wear, wherein when the control program for metering valve wear is executed by a processor, it implements the steps of the control method for metering valve wear as described in any one of claims 1 to 5.

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