Control method and device for preventing diesel engine combined parking and electronic equipment

Abstract

The invention discloses a control method and device for preventing diesel engine combined parking and electronic equipment, and belongs to the technical field of diesel engine control. The control method comprises the following steps that after a combined request signal is received, the current rotating speed of a diesel engine is obtained; according to the corresponding relation between the preset rotating speed and the maximum limiting oil quantity, the maximum limiting oil quantity corresponding to the rotating speed of the diesel engine is determined; correcting the maximum limited oil mass by using the oil mass correction coefficient to obtain the maximum set oil mass; the oil supply amount of the diesel engine is the maximum set oil amount, the oil amount correction coefficient is used for amplifying the limitation of the combined discharge oil amount, the oil supply amount during combined discharge is increased, the rotating speed reduced after the diesel engine suddenly loads is reduced, the situation that ignition cannot be conducted in an air cylinder due to the low rotating speed is avoided, and the diesel engine is prevented from being blocked.

Description

Technical Field

[0001] The present invention belongs to the technical field of diesel engine control, and particularly relates to a control method, device and electronic device for preventing a diesel engine from stalling during engagement. Background Art

[0002] A marine diesel engine power system generally includes: a diesel engine, a marine gearbox, a transmission shaft and a propeller. The diesel engine provides a power source. One end of the transmission shaft is connected to the propeller and the other end is connected to the gearbox to transmit power to the propeller. The propeller is the final power output unit. The rotation of the propeller blades in water can generate thrust, thereby driving the ship to move forward / backward, etc. The marine gearbox is responsible for connecting the diesel engine and the transmission shaft. One end is kept connected to the transmission shaft; the other end is disengaged from the diesel engine when power output is not required; when power output is required, the output shaft of the diesel engine and the transmission shaft are connected together through the pressure generated by the hydraulic oil inside the gearbox, and this process is called engagement. The engagement process is to transmit the power provided by the diesel engine step by step through the gearbox and the transmission shaft to the propeller.

[0003] Marine diesel engines generally engage at a low speed close to idle speed. When performing the engagement action, a relatively large load will be suddenly applied to the diesel engine. If the fuel supply of the diesel engine cannot keep up due to fuel quantity limitation, the speed of the diesel engine will decrease. When the speed drops to a certain value, ignition cannot occur in the cylinder, resulting in the diesel engine stalling. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide a control method, device and electronic device for preventing a diesel engine from stalling during engagement, which can increase the fuel quantity during engagement and improve the engagement responsiveness.

[0005] To solve the above technical problem, the technical solution of the present invention is as follows:[[]]

[0006] A control method for preventing a diesel engine from stalling during engagement includes: after receiving an engagement request signal, obtaining the current speed of the diesel engine; determining the maximum limited fuel quantity corresponding to the current speed of the diesel engine according to the preset corresponding relationship between speed and maximum limited fuel quantity; using a fuel quantity correction coefficient to correct the maximum limited fuel quantity to obtain the maximum set fuel quantity; and the fuel supply quantity of the diesel engine is the maximum set fuel quantity.

[0007] Further, the maximum set fuel quantity is the product of the maximum limited fuel quantity and the fuel quantity correction coefficient.

[0008] Further, the fuel quantity correction coefficient is 1 to 1.5.

[0009] Further, the rotational speed of the diesel engine is monitored in real time. When the rotational speed of the diesel engine is below the minimum operating rotational speed allowed for the diesel engine, a deceleration request is sent to the diesel engine, and the fuel supply of the diesel engine is restored to the maximum limited fuel quantity corresponding to the current rotational speed of the diesel engine.

[0010] Further, when the rotational speed of the diesel engine is restored to the preset successful engagement rotational speed, the fuel supply of the diesel engine is restored to the maximum limited fuel quantity corresponding to the current rotational speed of the diesel engine; if the rotational speed of the diesel engine is not restored to the successful engagement rotational speed, the fuel supply of the diesel engine remains unchanged at the maximum set fuel quantity.

[0011] Further, the successful engagement rotational speed is a preset multiple of the engagement set rotational speed of the diesel engine.

[0012] Further, the minimum operating rotational speed of the diesel engine is 0.5 times the engagement set rotational speed.

[0013] Further, after receiving the engagement request signal, a preset time delay is provided, and the fuel supply of the diesel engine is restored to the maximum limited fuel quantity corresponding to the current rotational speed of the diesel engine.

[0014] A control device for preventing the diesel engine from stalling during engagement, comprising:

[0015] A communication module, configured to obtain an engagement request signal sent by a gearbox control box, or send a deceleration request signal to the gearbox control box;

[0016] A determination module, configured to obtain the rotational speed of the diesel engine after receiving the engagement request signal, and determine the maximum limited fuel quantity corresponding to the current rotational speed of the diesel engine according to the corresponding relationship between the preset rotational speed and the maximum limited fuel quantity, and obtain the maximum set fuel quantity after correcting the maximum limited fuel quantity by a fuel quantity correction coefficient;

[0017] A control module, configured to control the diesel engine with the maximum set fuel quantity as the fuel supply, and control the deceleration, maintain the maximum set fuel quantity, or restore the maximum limited fuel quantity of the diesel engine according to the real-time detected rotational speed of the diesel engine.

[0018] An electronic device, comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein when the processor runs the computer program, the above control method is implemented.

[0019] After adopting the above technical solution, the beneficial effects of the present invention are:

[0020] In the control method for preventing the diesel engine from stalling during combined operation disclosed in the present invention, the limit of the combined operation fuel quantity is amplified by using the fuel quantity correction coefficient, the fuel supply quantity during combined operation is increased, the rotational speed decreased after the diesel engine suddenly increases the load is reduced, the situation where ignition cannot occur in the cylinder due to too low rotational speed is avoided, and the diesel engine from stalling is prevented.

[0021] In the present invention, when it is monitored that the rotational speed during combined operation is too low, a request for disengaging the clutch can be sent in a timely manner to further prevent the diesel engine from stalling.

[0022] In the present invention, after the combined operation request signal is received for more than a preset duration, the fuel supply quantity of the diesel engine returns to the normal value. Whether the combined operation is successful or not, the state of amplified fuel quantity will be exited, which can prevent the situation that the fuel quantity remains in the amplified state for a long time due to unsuccessful combined operation, resulting in black smoke emission from the diesel engine, etc., and reduce the risk. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the control method for preventing the diesel engine from stalling during combined operation of the present invention. Detailed Embodiments

[0024] The present invention will be further described below in conjunction with the drawings and embodiments. The preferred embodiments of the present invention are shown in the drawings. The role of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be construed as a limitation on the protection scope of the present invention.

[0025] Embodiment 1:

[0026] As Figure 1 shown, a control method for preventing the diesel engine from stalling during combined operation includes the following steps:

[0027] S2. After receiving the combined operation request signal S1 sent by the gearbox control box, increase the combined operation fuel quantity.

[0028] The execution subject of this embodiment can be the electronic control unit ECU of the diesel engine. The electronic control unit ECU can monitor the operating conditions of the diesel engine, obtain the rotational speed of the diesel engine, and can communicate with the gearbox control box to receive and send combined operation and disengaging the clutch request signals.

[0029] The specific calculation method for the increased fuel supply quantity Q includes:

[0030] S201. Obtain the current rotational speed N of the diesel engine.

[0031] S202. Determine the maximum limit fuel quantity Q1 corresponding to the current rotational speed N of the diesel engine according to the preset corresponding relationship between the rotational speed and the maximum limit fuel quantity.

[0032] S203. The maximum limit fuel quantity Q1 is corrected by the fuel quantity correction coefficient K1 to obtain the maximum set fuel quantity Q2.

[0033] Among them, the maximum set fuel quantity Q2 is the product of the maximum limit fuel quantity Q1 and the fuel quantity correction coefficient K1, that is, the maximum set fuel quantity Q2 = Q1 * K1. The fuel quantity correction coefficient K is 1 to 1.5. In this embodiment, it is preferably K1 = 1.1.

[0034] S203. The fuel supply quantity Q of the diesel engine is the maximum set fuel quantity Q2, that is, Q = Q1 * K1. By increasing the fuel supply quantity during combined rowing and amplifying the limit of the combined rowing fuel quantity, the reduction in the rotational speed of the diesel engine after sudden load addition can be reduced, and the situation where ignition cannot occur in the cylinder due to too low rotational speed can be avoided, preventing the diesel engine from stalling.

[0035] S3. The rotational speed N of the diesel engine is monitored in real time. When the rotational speed N of the diesel engine is below the minimum allowable operating rotational speed Nmin of the diesel engine, that is, N ≤ Nmin, a request for disengaging the row is sent to the diesel engine to prevent the diesel engine from stalling due to too low rotational speed.

[0036] At this time, the fuel supply quantity Q of the diesel engine is restored to the maximum limit fuel quantity Q1 corresponding to the current rotational speed N of the diesel engine.

[0037] S4. When the rotational speed N of the diesel engine returns to the preset combined row success rotational speed N2, that is, N ≥ N2, at this time the combined row of the diesel engine is completed, the rotational speed N of the diesel engine also rises to an appropriate value, and the fuel supply quantity Q of the diesel engine is restored to the maximum limit fuel quantity Q1 corresponding to the current rotational speed N of the diesel engine, Q = Q1.

[0038] However, if the rotational speed N of the diesel engine does not return to the combined row success rotational speed N2, that is, N < N2, the combined row of the diesel engine is not completed, or the combined row is completed but the rotational speed is low. At this time, a larger fuel supply is still required to quickly increase the rotational speed, then the fuel supply quantity Q of the diesel engine remains unchanged at the maximum set fuel quantity Q2, Q = Q2.

[0039] Among them, the combined row success rotational speed N2 is the combined row set rotational speed N1 of the diesel engine multiplied by the preset multiple K2, that is, N2 = K2 * N1. The combined row set rotational speed N1 is the rotational speed value of the diesel engine during combined rowing. This is the combined row rotational speed preset by the diesel engine according to different types, generally between 300 and 500 r / min.

[0040] Therefore, the determination condition for the completion of the combined row of the diesel engine is N ≥ K2 * N1.

[0041] Among them, the preset multiple K2 is 0.95 to 0.98. In this embodiment, it is preferably K2 = 0.95.

[0042] Further preferably, the minimum allowable operating rotational speed Nmin of the diesel engine is 0.5 times the combined row set rotational speed N1, that is, Nmin = 0.5 * N1.

[0043] S5. After receiving the combined row request signal S1, the fuel supply amount is amplified, Q = Q * K1, and the timing T starts. After a preset duration T1 has elapsed, i.e., when T ≥ T1, the fuel supply amount Q of the diesel engine resumes to the maximum limit fuel amount Q1 corresponding to the current rotational speed N of the diesel engine, Q = Q1. At this time, regardless of whether the combined row is successful or not, the state of fuel supply amount amplification will be exited, which can prevent the situation that the fuel amount remains in the amplified state for a long time due to unsuccessful combined row for a long time, resulting in black smoke from the diesel engine and other situations.

[0044] Among them, the preset duration T1 is 30s to 60s, and in this embodiment, it is preferably T1 = 40s.

[0045] Embodiment 2:

[0046] This application also protects a control device for preventing a diesel engine from stalling during combined row. This control device can be implemented by software, hardware, or a combination of software and hardware. For example, this control device can include integrated or separate functional modules or units to execute the corresponding steps in each method of Embodiment 1. Since the device embodiment of this embodiment is basically similar to the method embodiment of Embodiment 1, the description is relatively simple, and for the relevant parts, refer to the partial description of the method embodiment. The device embodiment described below is only illustrative.

[0047] A control device for preventing a diesel engine from stalling during combined row, comprising:

[0048] A communication module, configured to obtain a combined row request signal sent by a gearbox control box, or send a decoupling request signal to the gearbox control box;

[0049] A determination module, configured to obtain the rotational speed of the diesel engine after receiving the combined row request signal, and determine the maximum limit fuel amount corresponding to the current rotational speed of the diesel engine according to the preset corresponding relationship between the rotational speed and the maximum limit fuel amount, and obtain the maximum set fuel amount after correcting the maximum limit fuel amount by a fuel amount correction coefficient;

[0050] A control module, configured to control the diesel engine with the maximum set fuel amount as the fuel supply amount, and control the decoupling of the diesel engine, maintain the maximum set fuel amount, or resume the maximum limit fuel amount according to the real-time detected rotational speed of the diesel engine.

[0051] Embodiment 3:

[0052] This application also protects an electronic device corresponding to the control method for preventing a diesel engine from stalling during combined row provided in Embodiment 1. This electronic device can be a vehicle ECU, a mobile phone, a laptop computer, a tablet computer, a desktop computer, etc., to execute the control method of Embodiment 1.

[0053] An electronic device, comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein when the processor runs the computer program, the control method in the first embodiment is implemented.

[0054] The control method, device, and electronic device for preventing the diesel engine from stalling during combined operation amplify the limit of the combined operation fuel quantity by using the fuel quantity correction coefficient during the combined operation of the diesel engine, increase the fuel supply during combined operation, reduce the rotational speed drop after the diesel engine suddenly increases the load, and avoid the situation where ignition cannot occur in the cylinder due to the low rotational speed. Its control logic is simple and easy to implement, can effectively improve the combined operation responsiveness, and prevent the diesel engine from stalling during combined operation.

[0055] In the description of this specification, understand that greater than, less than, exceeding, etc. do not include the present number, and above, below, within, etc. include the present number.

[0056] In the description of this specification, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0057] Although the specific implementation manners of the present invention have been described above, those skilled in the art should understand that the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. These are only examples, and the protection scope of the present invention is defined by the claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these implementation manners without any creative work, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A control method for preventing diesel engines from parking in parallel, characterized in that: include: After receiving the combined transmission request signal, obtain the current speed of the diesel engine; Determine the maximum limit fuel quantity corresponding to the current speed of the diesel engine according to the preset correspondence relationship between the speed and the maximum limit fuel quantity; The maximum oil quantity limit is corrected using the oil quantity correction coefficient to obtain the maximum set oil quantity; The fuel supply amount of the diesel engine is the maximum set fuel amount.

2. The control method for preventing diesel engines from parking in parallel according to claim 1, characterized in that: The maximum set oil quantity is the product of the maximum limit oil quantity and the oil quantity correction coefficient.

3. The control method for preventing diesel engines from parking in parallel according to claim 2, characterized in that: The oil quantity correction coefficient is 1 to 1.

5.

4. The control method for preventing diesel engines from parking in parallel according to claim 1, characterized in that: The speed of the diesel engine is monitored in real time. When the speed of the diesel engine is below the minimum operating speed allowed by the diesel engine, a de-emission request is sent to the diesel engine, and the fuel supply of the diesel engine is restored to the maximum limit fuel supply corresponding to the current speed of the diesel engine.

5. The control method for preventing diesel engines from parking in parallel according to claim 4, characterized in that: When the speed of the diesel engine recovers to the preset successful engine speed, the fuel supply of the diesel engine recovers to the maximum limited fuel quantity corresponding to the current speed of the diesel engine; if the speed of the diesel engine does not recover to the successful engine speed, the fuel supply of the diesel engine maintains the maximum set fuel quantity unchanged.

6. The control method for preventing diesel engines from parking in parallel according to claim 5, characterized in that: The combined success speed is a preset multiple of the combined set speed of the diesel engine.

7. The control method for preventing diesel engines from parking in parallel according to claim 6, characterized in that: The minimum operating speed of the diesel engine is 0.5 times the combined set speed.

8. The control method for preventing diesel engines from parking in parallel according to any one of claims 1 to 7, characterized in that: After receiving the combined discharge request signal, the fuel supply of the diesel engine is delayed for a preset time period, and the fuel supply of the diesel engine is restored to the maximum limit fuel supply corresponding to the current speed of the diesel engine.

9. A control device for preventing diesel engines from parking in parallel, characterized in that: include: A communication module, used to obtain a gearbox connection request signal sent by a gearbox control box, or to send a gearbox disconnection request signal to the gearbox control box; A determination module, used for obtaining the speed of the diesel engine after receiving the combined emission request signal, and determining the maximum limit fuel quantity corresponding to the current speed of the diesel engine according to the correspondence between the preset speed and the maximum limit fuel quantity, and correcting the maximum limit fuel quantity by the fuel quantity correction coefficient to obtain the maximum set fuel quantity; The control module is used to control the diesel engine by taking the maximum set oil volume as the oil supply volume, and to control the diesel engine to disconnect the exhaust, maintain the maximum set oil volume or restore the maximum limit oil volume according to the real-time detected speed of the diesel engine.

10. An electronic device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the control method according to any one of claims 1 to 8 when executing the computer program.

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