A gas valve control method and system based on gas pressure differential correction

Abstract

The present invention proposes a gas valve control method based on gas pressure differential correction, relating to the technical field of gas valve control. The method comprises obtaining a calculated pressure differential value from an ECU; determining whether the calculated pressure differential value is within a threshold range of a set gas pressure differential value; if the calculated pressure differential value exceeds the threshold range of the set gas pressure differential value, obtaining a closed-loop correction coefficient, and correcting the calculated pressure differential value based on the closed-loop correction coefficient to obtain a corrected pressure differential value; further determining whether the corrected pressure differential value is within the threshold range of the set gas pressure differential value; if so, calculating the gas valve opening using the corrected pressure differential value; if not, calculating the gas valve opening using the upper and lower limits of the threshold range of the set gas pressure differential value. The present invention can promptly correct the pressure differential value when a pressure differential anomaly occurs, and use the corrected pressure differential value to calculate the gas valve opening, thereby achieving accurate control of the gas valve opening.

Description

Technical Field

[0001] The present invention belongs to the technical field of engine gas valve control, and in particular to a gas valve control method and system based on gas pressure difference correction. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Marine gas engines use high-pressure injection to intake air. The gas valve regulates the gas pressure and injects the gas into the intake pipe at a certain rate. The gas valve injects a fixed pressure and fixed quantity of gas into the intake manifold. The valve opening is calculated by the ECU based on the required gas and the gas pressure difference. The working principle of the gas valve is as follows: Figure 1 In the figure, a represents the gas intake, c represents the pressure-regulating diaphragm, d represents the pressure-regulating spring, and b represents the gas after pressure regulation. A pressure sensor is installed here to measure the gas injection pressure. e represents the gas flow control valve, and f represents the gas valve outlet, which is connected to the engine intake manifold via a high-pressure pipeline. The gas valve's pressure regulation principle is as follows: diaphragm c divides the pressure-regulating valve into two chambers: the upper chamber for the gas intake and the lower chamber for the return gas flowing back through a specific channel. Due to a balance of forces, the gas pressure on the upper chamber is balanced by the spring force and the pressure of the return gas on the lower chamber. The ECU adjusts the valve opening based on the calculated flow rate and the pressure differential across the flow control valve, thereby achieving gas control.

[0004] like Figure 2 The figure shows the gas valve control schematic. The ECU calculates the gas valve opening based on the required gas flow and the gas pressure differential. The ECU then controls the gas valve to open at the set opening to supply gas to the engine. Gas pressure differential = gas injection pressure - terminal pressure - pipeline pressure loss. The gas injection pressure is measured by the pressure sensor on the PFAV valve, while the terminal pressure is measured by the pressure sensor on the intake manifold. Pipeline pressure loss is calibrated during development.

[0005] However, when the pipeline is damaged, squeezed or its size changes, the pipeline pressure loss will also change. When the ECU calculates the opening of the gas valve based on the required gas flow and the gas pressure difference, it still calculates according to the calibrated pipeline pressure loss value, resulting in inaccurate calculated gas pressure difference value. There is a deviation between the actual gas supply and the calculated value, which will make the engine unstable and the transient loading capacity poor.

[0006] The inventors have discovered that the prior art is still unable to realize the function of reporting an error when an abnormal pressure difference occurs and correcting the pressure difference. Summary of the Invention

[0007] The object of the present invention is to provide a gas valve control method and system based on gas pressure differential correction. When a pressure differential abnormality occurs, the pressure differential value can be corrected in a timely manner, and the gas valve opening can be calculated using the corrected pressure differential value to obtain an accurate opening value, thereby achieving accurate control of the gas valve opening. At the same time, a replacement value for the corrected pressure differential value is set. When the corrected pressure differential value still does not meet the requirements, the replacement value is used to calculate the opening value, thereby solving the problems in the prior art.

[0008] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions:

[0009] A first aspect of the present invention provides a gas valve control method based on gas pressure difference correction.

[0010] A gas valve control method based on gas pressure differential correction includes the following steps:

[0011] Get the calculated pressure difference value of ECU;

[0012] Determine whether the calculated pressure difference value is within the threshold range of the set gas pressure difference value;

[0013] If the calculated pressure difference exceeds the threshold range of the set gas pressure difference, a closed-loop correction coefficient is obtained, and the calculated pressure difference is corrected based on the closed-loop correction coefficient to obtain a corrected pressure difference;

[0014] Continue to determine whether the corrected pressure difference value is within the set gas pressure difference value threshold range. If so, use the corrected pressure difference value to calculate the gas valve opening; if not, use the upper and lower limits of the set gas pressure difference value threshold range to calculate the gas valve opening.

[0015] Preferably, the calculated pressure difference value is corrected by multiplying the difference of the closed-loop correction coefficient minus 1 by the set gas pressure difference value to obtain the corrected pressure difference value.

[0016] Preferably, the specific formula for correcting the calculated pressure difference value based on the closed-loop correction coefficient is:

[0017] DP aft =DP-P(CL-1)

[0018] Among them, DP aft is the corrected pressure differential value, DP is the calculated pressure differential value, P is the set gas pressure differential value, and CL is the closed-loop correction coefficient.

[0019] Preferably, if the calculated pressure difference value is within the threshold range of the set gas pressure difference value, the calculated pressure difference value is directly used to calculate the opening of the gas valve.

[0020] Preferably, when the calculated pressure difference value is greater than the upper limit value of the threshold range of the set gas pressure difference value, a gas pressure difference exceeding the upper limit is reported, and it is recommended to check the back-end pipeline; when the calculated pressure difference value is less than the lower limit value of the threshold range of the set gas pressure difference value, a gas pressure difference lower limit fault is reported, and it is recommended to check the natural gas inlet pressure.

[0021] Preferably, when it is determined that the corrected pressure difference value exceeds the threshold range of the set gas pressure difference value, an error alarm operation is performed and a torque limiting operation is performed on the engine at the same time.

[0022] Preferably, the gas pressure difference value P and its deviation value D are predetermined, and the threshold range of the gas pressure difference value is set to (PD to P+D).

[0023] A second aspect of the present invention provides a gas valve control system based on gas pressure difference correction.

[0024] A gas valve control system based on gas pressure differential correction, comprising:

[0025] The calculated pressure difference value acquisition module is configured to: acquire the calculated pressure difference value of the ECU;

[0026] The initial determination module is configured to: determine whether the calculated pressure difference value is within a set gas pressure difference value threshold range;

[0027] The correction module is configured to: if the calculated pressure difference value exceeds a threshold range of a set gas pressure difference value, obtain a closed-loop correction coefficient, and correct the calculated pressure difference value based on the closed-loop correction coefficient to obtain a corrected pressure difference value;

[0028] The secondary determination module is configured to: continue to determine whether the corrected pressure difference value is within the threshold range of the set gas pressure difference value; if so, use the corrected pressure difference value to calculate the gas valve opening; if not, use the upper and lower limits of the threshold range of the set gas pressure difference value to calculate the gas valve opening.

[0029] A third aspect of the present invention provides a computer-readable storage medium having a program stored thereon, which, when executed by a processor, implements the steps of the gas valve control method based on gas pressure difference correction as described in the first aspect of the present invention.

[0030] A fourth aspect of the present invention provides an electronic device comprising a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the steps of the gas valve control method based on gas pressure difference correction as described in the first aspect of the present invention are implemented.

[0031] One or more of the above technical solutions have the following beneficial effects:

[0032] The present invention provides a gas valve control method and system based on gas pressure differential correction. When a pressure differential abnormality occurs, the pressure differential value can be corrected in time, and the corrected pressure differential value is used to calculate the gas valve opening, thereby obtaining an accurate opening value and realizing accurate control of the gas valve opening.

[0033] The present invention also sets a replacement value for the corrected pressure difference value. When the corrected pressure difference value still does not meet the requirements and exceeds the threshold range of the set gas pressure difference value, the replacement value is used to calculate the opening value.

[0034] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0036] Figure 1 This is the working principle diagram of the gas valve.

[0037] Figure 2 This is the gas valve control schematic.

[0038] Figure 3 This is the schematic diagram of the oxygen closed loop.

[0039] Figure 4 This is a control flow chart of the first embodiment of the present invention. DETAILED DESCRIPTION

[0040] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0041] It should be noted that the terms used herein are for describing particular embodiments only and are not intended to limit the exemplary embodiments according to the present invention.

[0042] In the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0043] Example 1

[0044] This embodiment discloses a gas valve control method based on gas pressure difference correction.

[0045] like Figure 4 As shown, a gas valve control method based on gas pressure difference correction includes the following steps:

[0046] Get the calculated pressure difference value of ECU;

[0047] Determine whether the calculated pressure difference value is within the threshold range of the set gas pressure difference value;

[0048] If the calculated pressure difference exceeds the threshold range of the set gas pressure difference, a closed-loop correction coefficient is obtained, and the calculated pressure difference is corrected based on the closed-loop correction coefficient to obtain a corrected pressure difference;

[0049] Continue to determine whether the corrected pressure difference value is within the set gas pressure difference value threshold range. If so, use the corrected pressure difference value to calculate the gas valve opening; if not, use the upper and lower limits of the set gas pressure difference value threshold range to calculate the gas valve opening.

[0050] Furthermore, the calculated pressure difference value is corrected by multiplying the difference value obtained by subtracting 1 from the closed-loop correction coefficient and the set gas pressure difference value to obtain a corrected pressure difference value.

[0051] Furthermore, the specific formula for correcting the calculated pressure difference value based on the closed-loop correction coefficient is:

[0052] DP aft =DP-P(CL-1)

[0053] Among them, DP aft is the corrected pressure differential value, DP is the calculated pressure differential value, P is the set gas pressure differential value, and CL is the closed-loop correction coefficient.

[0054] Furthermore, if the calculated pressure difference value is within the threshold range of the set gas pressure difference value, the calculated pressure difference value is directly used to calculate the opening of the gas valve.

[0055] Furthermore, when the calculated pressure difference value is greater than the upper limit value of the threshold range of the set gas pressure difference value, a gas pressure difference exceeding the upper limit is reported, and it is recommended to check the back-end pipeline; when the calculated pressure difference value is less than the lower limit value of the threshold range of the set gas pressure difference value, a gas pressure difference lower limit fault is reported, and it is recommended to check the natural gas inlet pressure.

[0056] Furthermore, when it is determined that the corrected pressure difference value exceeds the threshold range of the set gas pressure difference value, an error alarm operation is performed and the engine torque is limited.

[0057] Furthermore, the gas pressure difference value P and its deviation value D are predetermined, and the threshold range of the gas pressure difference value is set to (PD to P+D).

[0058] The improved principle is shown in Figure 4 , set the gas pressure difference P and the deviation range ±D. After the ECU calculates the pressure difference, it must first determine whether it is within (PD ~ P + D). If it is within the range, the calculated gas pressure difference is directly used to calculate and control the opening of the gas valve.

[0059] If the calculated pressure difference is not within the set range, the calculated pressure difference > P+D will indicate that the gas pressure difference exceeds the upper limit, and it is recommended to check the rear-end pipeline. If the calculated pressure difference < P+D will indicate that the gas pressure difference is below the lower limit, and it is recommended to check the natural gas inlet pressure.

[0060] The ECU corrects the gas differential pressure using the formula DP-P(CL-1), where DP is the calculated differential pressure, P is the set theoretical differential pressure, and CL is the closed-loop correction factor. If the corrected differential pressure is within the range (PD to P+D), the corrected differential pressure is used for calculations. If the corrected differential pressure exceeds the range (PD to P+D), PD is used if the pressure is below the lower limit, and P+D is used if the pressure exceeds the upper limit. An error message is displayed and torque is limited.

[0061] The working principle of oxygen closed loop is shown in Figure 3 After the engine enters the closed loop, the required air-fuel ratio is determined based on the speed and intake manifold pressure. An oxygen concentration sensor is installed on the exhaust manifold. The ECU calculates the actual air-fuel ratio based on the oxygen concentration. When the actual air-fuel ratio is inconsistent with the set air-fuel ratio, the ECU will multiply the theoretically calculated gas volume by CL (closed-loop correction coefficient). When the actual air-fuel ratio is less than the set air-fuel ratio, CL is greater than 1, and the ECU increases the gas volume. When the actual air-fuel ratio is greater than the set air-fuel ratio, CL is less than 1, and the ECU reduces the gas volume.

[0062] like Figure 1 As shown, compared with the prior art method of calculating pressure by using a pressure sensor installed at the gas after pressure regulation and a pressure sensor at the gas valve outlet, this embodiment can install a pressure sensor only at the gas after pressure regulation. The gas is sprayed into the intake manifold, and the terminal pressure is similar to the intake manifold pressure. Therefore, the total pressure of the intake manifold can be used to calibrate the pressure drop of the gas in the pipeline (g) under different flow rates. The gas pressure-terminal pressure-pipeline pressure drop is used as the inlet and outlet pressure difference of the gas valve. When the pipeline pressure is abnormal, an error can be reported and the pressure difference can be corrected. When the corrected value still exceeds the limit, an alternative value is used and a torque limiting operation is performed.

[0063] Example 2

[0064] This embodiment discloses a gas valve control system based on gas pressure difference correction.

[0065] A gas valve control system based on gas pressure differential correction, comprising:

[0066] The calculated pressure difference value acquisition module is configured to: acquire the calculated pressure difference value of the ECU;

[0067] The initial determination module is configured to: determine whether the calculated pressure difference value is within a set gas pressure difference value threshold range;

[0068] The correction module is configured to: if the calculated pressure difference value exceeds a threshold range of a set gas pressure difference value, obtain a closed-loop correction coefficient, and correct the calculated pressure difference value based on the closed-loop correction coefficient to obtain a corrected pressure difference value;

[0069] The secondary determination module is configured to: continue to determine whether the corrected pressure difference value is within the threshold range of the set gas pressure difference value; if so, use the corrected pressure difference value to calculate the gas valve opening; if not, use the upper and lower limits of the threshold range of the set gas pressure difference value to calculate the gas valve opening.

[0070] Example 3

[0071] The purpose of this embodiment is to provide a computer-readable storage medium.

[0072] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the gas valve control method based on gas pressure difference correction as described in Example 1 of the present disclosure.

[0073] Example 4

[0074] The purpose of this embodiment is to provide an electronic device.

[0075] An electronic device includes a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the steps of the gas valve control method based on gas pressure difference correction as described in Example 1 of the present disclosure are implemented.

[0076] The steps involved in the apparatuses of Examples 2, 3, and 4 above correspond to those of Method Example 1. For detailed implementations, please refer to the relevant description of Example 1. The term "computer-readable storage medium" should be understood to mean a single medium or multiple media containing one or more instruction sets; it should also be understood to include any medium capable of storing, encoding, or carrying an instruction set for execution by a processor and causing the processor to perform any method of the present invention.

[0077] Those skilled in the art will appreciate that the modules or steps of the present invention described above can be implemented using a general-purpose computer device. Alternatively, they can be implemented using program code executable by a computing device, which can then be stored in a storage device and executed by the computing device. Alternatively, they can be fabricated into separate integrated circuit modules, or multiple modules or steps can be fabricated into a single integrated circuit module for implementation. The present invention is not limited to any specific combination of hardware and software.

[0078] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. A gas valve control method based on gas pressure differential correction, wherein the gas pressure differential is the inlet and outlet pressure difference of the engine gas valve, and the gas valve sprays a fixed pressure and fixed quantity of gas into the intake manifold, characterized in that: The following steps are involved: Get the calculated pressure difference value of ECU; Determine whether the calculated pressure difference value is within the threshold range of the set gas pressure difference value; If the calculated pressure difference exceeds the threshold range of the set gas pressure difference, a closed-loop correction coefficient is obtained, and the calculated pressure difference is corrected based on the closed-loop correction coefficient to obtain a corrected pressure difference. The closed-loop correction coefficient is the closed-loop correction coefficient of the air-fuel ratio after the engine enters the closed-loop. When the actual air-fuel ratio is less than the set air-fuel ratio, the closed-loop correction coefficient is greater than 1; when the actual air-fuel ratio is greater than the set air-fuel ratio, the closed-loop correction coefficient is less than 1. Continue to determine whether the corrected pressure difference value is within the set gas pressure difference value threshold range. If so, use the corrected pressure difference value to calculate the gas valve opening; if not, use the upper and lower limits of the set gas pressure difference value threshold range to calculate the gas valve opening.

2. The gas valve control method based on gas pressure difference correction according to claim 1, characterized in that: The calculated pressure difference value is corrected by multiplying the difference between the closed-loop correction coefficient and 1 and the set gas pressure difference value to obtain the corrected pressure difference value.

3. The gas valve control method based on gas pressure difference correction according to claim 2, characterized in that: The specific formula for correcting the calculated pressure difference value based on the closed-loop correction coefficient is: DP aft =DP-P(CL-1) Among them, DP aft is the corrected pressure differential value, DP is the calculated pressure differential value, P is the set gas pressure differential value, and CL is the closed-loop correction coefficient.

4. The gas valve control method based on gas pressure difference correction according to claim 1, characterized in that: If the calculated pressure difference value is within the threshold range of the set gas pressure difference value, the calculated pressure difference value is directly used to calculate the opening of the gas valve.

5. The gas valve control method based on gas pressure difference correction according to claim 1, characterized in that: When the calculated pressure difference value is greater than the upper limit of the threshold range of the set gas pressure difference value, a gas pressure difference exceeding the upper limit fault is reported, and it is recommended to check the back-end pipeline; when the calculated pressure difference value is less than the lower limit of the threshold range of the set gas pressure difference value, a gas pressure difference lower limit fault is reported, and it is recommended to check the natural gas inlet pressure.

6. The gas valve control method based on gas pressure difference correction according to claim 1, characterized in that: When it is determined that the corrected pressure difference value exceeds the threshold range of the set gas pressure difference value, an error alarm operation is performed and the engine torque is limited.

7. The gas valve control method based on gas pressure difference correction according to claim 1, characterized in that: The set gas pressure difference value P and its deviation value D are predetermined, and the threshold range of the set gas pressure difference value is (PD~P+D).

8. A gas valve control system based on gas pressure differential correction, where the gas pressure differential is the inlet and outlet pressure difference of the engine gas valve. The gas valve sprays a constant pressure and fixed quantity of gas into the intake manifold, characterized by: include: The calculated pressure difference value acquisition module is configured to: acquire the calculated pressure difference value of the ECU; The initial determination module is configured to: determine whether the calculated pressure difference value is within a set gas pressure difference value threshold range; The correction module is configured to: if the calculated pressure difference value exceeds a threshold range of a set gas pressure difference value, obtain a closed-loop correction coefficient, and correct the calculated pressure difference value based on the closed-loop correction coefficient to obtain a corrected pressure difference value; the closed-loop correction coefficient is a closed-loop correction coefficient for the air-fuel ratio after the engine enters the closed-loop, when the actual air-fuel ratio is less than the set air-fuel ratio, the closed-loop correction coefficient is greater than 1, and when the actual air-fuel ratio is greater than the set air-fuel ratio, the closed-loop correction coefficient is less than 1; The secondary determination module is configured to: continue to determine whether the corrected pressure difference value is within the threshold range of the set gas pressure difference value; if so, use the corrected pressure difference value to calculate the gas valve opening; if not, use the upper and lower limits of the threshold range of the set gas pressure difference value to calculate the gas valve opening.

9. A computer-readable storage medium having a program stored thereon, characterized in that: When the program is executed by a processor, the steps of the gas valve control method based on gas pressure difference correction as described in any one of claims 1 to 7 are implemented.

10. An electronic device comprising a memory, a processor, and a program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the gas valve control method based on gas pressure difference correction according to any one of claims 1 to 7 are implemented.

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