An engine protection method, apparatus, and medium

Abstract

The embodiment of the application discloses an engine protection method, device and medium. The method comprises the following steps: acquiring an engine speed; in the case that the engine speed meets a preset speed threshold, determining the oil supply amount of two common rail pipes corresponding to the respective single cylinder number based on the data collected by a preset rail pressure sensor; wherein, the preset rail pressure sensor is arranged upstream of a flow restrictor, the flow restrictor is arranged upstream of the oil outlet of the common rail pipe, and one flow restrictor is arranged on each of the two common rail pipes; comparing the oil supply amount of the two common rail pipes with a preset oil supply threshold, and determining the common rail pipe to be protected based on the comparison result; and starting the corresponding operation on the common rail pipe to be protected based on a preset engine protection strategy, so as to realize the protection of the engine. Through the above method, the installation cost of the flow restrictor is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the engine technical field, and in particular to an engine protection method, device and medium. BACKGROUND

[0002] The diesel engine has high thermal efficiency, good economy, easy starting and great adaptability to various ships, and has been used as a ship propulsion power since its appearance. When the fuel injection of the ship engine abnormally increases or leakage occurs, the engine needs to be protected to stop fuel injection.

[0003] The large-bore diesel engine has a large number of cylinders, which are generally arranged in a V shape and have a large number of cylinders. The fuel injection pump, fuel injector and common rail pipe are arranged on the left and right sides, the left and right sides are connected by a high-pressure oil pipe, and the flow restrictor is installed at the outlet of the common rail pipe.

[0004] The prior art is to install a flow restrictor inside each fuel injector or at the outlet of the common rail pipe of each cylinder. Since the number of flow restrictors is large, the number of high-pressure sealing points is large, it is difficult to troubleshoot the leakage point, the reliability is poor, and the cost is high. SUMMARY

[0005] The engine protection method, device and medium provided by the embodiments of the present application solve the technical problem that the prior art is to install a flow restrictor inside each fuel injector or at the outlet of the common rail pipe of each cylinder. Since the number of flow restrictors is large, the number of high-pressure sealing points is large, it is difficult to troubleshoot the leakage point, the reliability is poor, and the cost is high.

[0006] The embodiments of the present application adopt the following technical solutions:

[0007] The engine protection method provided by the embodiments of the present application comprises the following steps: acquiring the engine speed; determining the fuel supply amount of the common rail pipes on the left and right sides of the engine based on the single-side cylinder number corresponding to the common rail pipes on the left and right sides and the data collected by the preset rail pressure sensor, in the case that the engine speed meets the preset speed threshold; wherein the preset rail pressure sensor is arranged upstream of the flow restrictor, the flow restrictor is arranged upstream of the outlet of the common rail pipe, and one flow restrictor is arranged on each of the common rail pipes on the left and right sides; comparing the fuel supply amount of the common rail pipes on the left and right sides with the preset fuel supply threshold, and determining the common rail pipe to be protected based on the comparison result; and starting the corresponding operation on the common rail pipe to be protected based on the preset engine protection strategy, so as to protect the engine.

[0008] The embodiment of the application cancels the high-pressure oil pipe between the rails, reduces the number of flow restrictor installations, can reduce the risk of high-pressure oil leakage and improve reliability, reduces the number of high-pressure leakage points from 70 to 40, reduces by 43%, and can also reduce the installation cost. Secondly, the embodiment of the application determines the to-be-protected side common rail pipe by comparing the results, can reduce the number of cylinders to be detected when a fault occurs, quickly determines the fault point, quickly repairs the fault, and ensures stable operation of the engine.

[0009] In an implementation manner of the application, based on the single-side cylinder number corresponding to the two-side common rail pipes respectively and the data collected by the pre-set rail pressure sensor, the oil supply amounts corresponding to the two-side common rail pipes respectively are determined, specifically including: determining the single-side cylinder number corresponding to the first-side common rail pipe, the first injection amount corresponding to the single-side cylinders respectively, the first injector return oil amount corresponding to the single-side cylinders respectively, and the first actual rail pressure value corresponding to the first-side common rail pipe, to construct the oil supply amount determination function corresponding to the first-side common rail pipe; and determining the single-side cylinder number corresponding to the second-side common rail pipe, the second injection amount corresponding to the single-side cylinders respectively, the second injector return oil amount corresponding to the single-side cylinders respectively, and the second actual rail pressure value corresponding to the second-side common rail pipe, to construct the oil supply amount determination function corresponding to the second-side common rail pipe; based on the oil supply amount determination function corresponding to the first-side common rail pipe and the oil supply amount determination function corresponding to the second-side common rail pipe, the oil supply amounts corresponding to the two-side common rail pipes respectively are determined.

[0010] In an implementation manner of the application, the oil supply amount determination function corresponding to the first-side common rail pipe is constructed, specifically including: based on the function Q1=(the first injection amount+the first injector return oil amount)×N1+PID feedback oil amount(the first target rail pressure-the first actual rail pressure); the oil supply amount determination function corresponding to the first-side common rail pipe is constructed; wherein Q1 is the oil supply amount corresponding to the first-side common rail pipe, and N1 is the single-side cylinder number corresponding to the first-side common rail pipe.

[0011] In an implementation manner of the application, the oil supply amount determination function corresponding to the second-side common rail pipe is constructed, specifically including: based on the function Q2=(the second injection amount+the second injector return oil amount)×N2+PID feedback oil amount(the second target rail pressure-the second actual rail pressure); the oil supply amount determination function corresponding to the second-side common rail pipe is constructed; wherein Q2 is the oil supply amount corresponding to the second-side common rail pipe, and N2 is the single-side cylinder number corresponding to the second-side common rail pipe.

[0012] In an implementation form of the present application, the oil supply amount corresponding to each of the two sides of the common rail pipe is compared with the preset oil supply amount threshold, and the side common rail pipe to be protected is determined based on the comparison result, specifically including: in the case that the oil supply amount corresponding to the first side common rail pipe is not greater than the first preset oil supply amount threshold, and the oil supply amount corresponding to the second side common rail pipe is greater than the second preset oil supply amount threshold, it is determined that the oil supply amount corresponding to the first side common rail pipe is abnormal; or in the case that the oil supply amount corresponding to the first side common rail pipe is greater than the first preset oil supply amount threshold, and the oil supply amount corresponding to the second side common rail pipe is not greater than the second preset oil supply amount threshold, it is determined that the oil supply amount corresponding to the second side common rail pipe is abnormal; or in the case that the oil supply amount corresponding to the first side common rail pipe is not greater than the first preset oil supply amount threshold, and the oil supply amount corresponding to the second side common rail pipe is not greater than the second preset oil supply amount threshold, it is determined that the oil supply amount corresponding to the first side common rail pipe and the oil supply amount corresponding to the second side common rail pipe are both abnormal.

[0013] In an implementation form of the present application, after determining the side common rail pipe to be protected based on the comparison result, the method further includes: in the case that the oil supply amount corresponding to the first side common rail pipe is abnormal, reporting a first side flow restrictor closed fault code; or in the case that the oil supply amount corresponding to the second side common rail pipe is abnormal, reporting a second side flow restrictor closed fault code; or in the case that the oil supply amount corresponding to the first side common rail pipe and the oil supply amount corresponding to the second side common rail pipe are both abnormal, reporting the first side flow restrictor closed fault code and reporting the second side flow restrictor closed fault code.

[0014] In an implementation form of the present application, after determining the side common rail pipe to be protected based on the comparison result, the method further includes: entering a single side working mode based on the single side common rail pipe for which no flow restrictor closed fault code has been reported.

[0015] In an implementation form of the present application, based on the preset engine protection strategy, corresponding operations are started on the side common rail pipe to be protected, specifically including: based on the preset engine protection strategy, setting the rail pressure corresponding to the side to be protected to 0; closing the metering valve and setting it to the maximum current; and performing no power supply treatment on the oil injector.

[0016] The engine protection device provided in the embodiments of the present application comprises at least one processor and a memory connected with the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to acquire an engine speed, determine oil supply amounts of two-side common rail pipes corresponding to respective single-side cylinder numbers based on data collected by preset rail pressure sensors in the case that the engine speed meets a preset speed threshold, wherein the preset rail pressure sensors are arranged upstream of flow restrictors, the flow restrictors are arranged upstream of oil outlets of the common rail pipes, and one flow restrictor is arranged for each of the two-side common rail pipes, compare the oil supply amounts of the two-side common rail pipes corresponding to the respective single-side cylinder numbers with a preset oil supply threshold, determine a to-be-protected-side common rail pipe based on a comparison result, and start corresponding operation on the to-be-protected-side common rail pipe based on a preset engine protection strategy to achieve protection of the engine.

[0017] The nonvolatile computer storage medium provided in the embodiments of the present application stores computer executable instructions, and the computer executable instructions are configured to acquire an engine speed, determine oil supply amounts of two-side common rail pipes corresponding to respective single-side cylinder numbers based on data collected by preset rail pressure sensors in the case that the engine speed meets a preset speed threshold, wherein the preset rail pressure sensors are arranged upstream of flow restrictors, the flow restrictors are arranged upstream of oil outlets of the common rail pipes, and one flow restrictor is arranged for each of the two-side common rail pipes, compare the oil supply amounts of the two-side common rail pipes corresponding to the respective single-side cylinder numbers with a preset oil supply threshold, determine a to-be-protected-side common rail pipe based on a comparison result, and start corresponding operation on the to-be-protected-side common rail pipe based on a preset engine protection strategy to achieve protection of the engine.

[0018] The above at least one technical solution adopted in the embodiments of the present application can achieve the following beneficial effects: the embodiments of the present application cancel high-pressure oil pipes between rails by arranging one flow restrictor for each of the two-side common rail pipes, reduce the number of installed flow restrictors, can not only reduce high-pressure oil leakage risk and improve reliability, reduce the number of high-pressure leakage points from 70 to 40, reduce by 43%, but also can reduce installation cost. Secondly, the embodiments of the present application determine a to-be-protected-side common rail pipe based on a comparison result, can narrow the number of to-be-detected cylinders when a fault occurs, quickly determine a fault point, quickly repair the fault, and ensure stable operation of the engine. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without any creative labor under the premise of the drawings. In the drawings

[0020] In the drawings:

[0021] Figure 1 A flow chart of an engine protection method provided by an embodiment of the present application is shown in FIG. 1.

[0022] Figure 2 A flow chart of an engine protection method provided by an embodiment of the present application is shown in FIG. 1.

[0023] Figure 3 A flow chart of an engine protection method provided by an embodiment of the present application is shown in FIG. 1. DETAILED DESCRIPTION

[0024] The present application provides an engine protection method, device and medium.

[0025] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0026] The technical solutions provided by the embodiments of the present application will be described in detail below with reference to the drawings.

[0027] Figure 1 A flow chart of an engine protection method provided by an embodiment of the present application is shown in FIG. 1. Figure 1 The engine protection method includes the following steps:

[0028] S101, obtaining the engine speed.

[0029] In an embodiment of the present application, the large-bore diesel engine has a large number of cylinders, which are generally arranged in a V shape, and the maximum number of cylinders is 20. The fuel injection pump, fuel injector and common rail pipe are arranged on the left and right sides, and the left and right sides are connected by a high-pressure oil pipe. The flow restrictor is installed at the oil outlet of the common rail pipe. When the fuel injection of the marine engine abnormally increases or leakage occurs, the engine needs to be protected to stop fuel injection.

[0030] It should be noted that when the flow rate of the outlet exceeds the limit or leakage occurs, the flow restrictor will be closed to play a protective role.

[0031] In the prior art, a flow restrictor is installed inside each fuel injector or at the outlet of the common rail pipe of each cylinder. Due to the large number of flow restrictors, the cost is high. In addition, the number of high-pressure sealing points is large, it is difficult to troubleshoot the oil leakage point, and the reliability is poor.

[0032] The embodiment of the application installs one large flow restrictor upstream of the oil outlet of the common rail pipe on both sides of the engine to protect the engine, and the control logic ECU automatically identifies the closed side and enters the single-side working mode to reduce the cost and improve the reliability.

[0033] First, the current engine to be protected is powered on to obtain its corresponding speed. If the speed is greater than the preset speed threshold, it is determined that the power-on is normal, and the next step is performed. If the speed is not greater than the preset speed threshold, it is determined that the power-on is unsuccessful, and the power-on needs to be restarted.

[0034] In the embodiment of the application, the preset speed threshold is preferably set to 0, and in actual application, it can be adjusted according to requirements, which is not limited in the embodiment of the application.

[0035] S102, in the case that the engine speed meets the preset speed threshold, based on the single-side cylinder number corresponding to the common rail pipe on both sides and the data collected by the preset rail pressure sensor, the oil supply amount corresponding to the common rail pipe on both sides is determined.

[0036] In an embodiment of the application, the preset rail pressure sensor is arranged upstream of the flow restrictor, the flow restrictor is arranged upstream of the oil outlet of the common rail pipe, and one flow restrictor is arranged on each side of the common rail pipe. That is, in the embodiment of the application, one large flow restrictor is arranged upstream of the oil outlet of the common rail pipe on both sides, and one rail pressure sensor is arranged upstream of each large flow restrictor.

[0037] The embodiment of the application can reduce the number of flow restrictors and reduce the cost by arranging one flow restrictor on each side of the rail pressure pipe. Secondly, by reducing the number of flow restrictors, the high-pressure oil leakage risk is reduced and the reliability is improved: the high-pressure leakage points are reduced from 70 to 40, which is reduced by 43%.

[0038] In an embodiment of the application, the single-side cylinder number corresponding to the first side common rail pipe, the first injection amount corresponding to the single-side cylinder, the first injector return oil amount corresponding to the single-side cylinder, and the first actual rail pressure value corresponding to the first side common rail pipe are determined to construct the oil supply amount determination function corresponding to the first side common rail pipe. And the single-side cylinder number corresponding to the second side common rail pipe, the second injection amount corresponding to the single-side cylinder, the second injector return oil amount corresponding to the single-side cylinder, and the second actual rail pressure value corresponding to the second side common rail pipe are determined to construct the oil supply amount determination function corresponding to the second side common rail pipe, based on the oil supply amount determination function corresponding to the first side common rail pipe and the oil supply amount determination function corresponding to the second side common rail pipe, the oil supply amount corresponding to the common rail pipe on both sides is determined.

[0039] Specifically, in the case of the rotational speed meeting the requirements, left rail pressure control is performed. The number of single-side cylinders corresponding to the first side common rail pipe, i.e., the number of left-side cylinders, is determined. Then, the injection amounts corresponding to the left-side single-side cylinders are determined, and the injection amounts corresponding to the left-side cylinders are all the same. Further, the first injector return oil amounts corresponding to the left-side cylinders are determined. The actual rail pressure values corresponding to the left side are obtained by the rail pressure sensor arranged on the left side. Based on the above-obtained data, the left rail pressure can be controlled.

[0040] Further, in the case of the rotational speed meeting the requirements, right rail pressure control is performed simultaneously. The number of single-side cylinders corresponding to the second side common rail pipe, i.e., the number of right-side cylinders, is determined. Then, the injection amounts corresponding to the right-side single-side cylinders are determined, and the injection amounts corresponding to the right-side cylinders are all the same. Further, the second injector return oil amounts corresponding to the right-side cylinders are determined. The actual rail pressure values corresponding to the right side are obtained by the rail pressure sensor arranged on the right side. Based on the above-obtained data, the right rail pressure can be controlled.

[0041] In an embodiment of the present application, based on the function:

[0042] Q1 = (first injection amount + first injector return oil amount) × N1 + PID feedback oil amount (first target rail pressure - first actual rail pressure);

[0043] A determination function of the oil supply amount corresponding to the first side common rail pipe is constructed. Wherein, Q1 is the oil supply amount corresponding to the first side common rail pipe, and N1 is the number of single-side cylinders corresponding to the first side common rail pipe.

[0044] In an embodiment of the present application, based on the function:

[0045] Q2 = (second injection amount + second injector return oil amount) × N2 + PID feedback oil amount (second target rail pressure - second actual rail pressure);

[0046] A determination function of the oil supply amount corresponding to the second side common rail pipe is constructed. Wherein, Q2 is the oil supply amount corresponding to the second side common rail pipe, and N2 is the number of single-side cylinders corresponding to the second side common rail pipe.

[0047] S103, compare the oil supply amounts corresponding to the two side common rail pipes with the preset oil supply threshold, and determine the to-be-protected side common rail pipe based on the comparison result.

[0048] In an embodiment of the present application, in the case that the oil supply amount corresponding to the first side common rail pipe is not greater than the first preset oil supply amount threshold and the oil supply amount corresponding to the second side common rail pipe is greater than the second preset oil supply amount threshold, it is determined that the oil supply amount corresponding to the first side common rail pipe is abnormal. Or in the case that the oil supply amount corresponding to the first side common rail pipe is greater than the first preset oil supply amount threshold and the oil supply amount corresponding to the second side common rail pipe is not greater than the second preset oil supply amount threshold, it is determined that the oil supply amount corresponding to the second side common rail pipe is abnormal. Or in the case that the oil supply amount corresponding to the first side common rail pipe is not greater than the first preset oil supply amount threshold and the oil supply amount corresponding to the second side common rail pipe is not greater than the second preset oil supply amount threshold, it is determined that the oil supply amount corresponding to the first side common rail pipe and the oil supply amount corresponding to the second side common rail pipe are both abnormal.

[0049] Specifically, based on the different oil supply amounts of the left and right sides, whether the left and right sides are abnormal and whether the fault code needs to be reported are determined.

[0050] Specifically, if the oil supply amount of the left side is not greater than the preset oil supply amount, the left side common rail pipe has a problem and needs to be protected. In the present application, the preset oil supply amount is set to 0, which can be adjusted according to actual conditions in application, and the present application does not limit this.

[0051] Specifically, if the oil supply amount of the right side is not greater than the preset oil supply amount, the right side common rail pipe has a problem and needs to be protected. In the present application, the preset oil supply amount is set to 0, which can be adjusted according to actual conditions in application, and the present application does not limit this.

[0052] In an embodiment of the present application, in the case that the oil supply amount corresponding to the first side common rail pipe is abnormal, the first side flow restrictor closed fault code is reported. Or in the case that the oil supply amount corresponding to the second side common rail pipe is abnormal, the second side flow restrictor closed fault code is reported. Or in the case that the oil supply amount corresponding to the first side common rail pipe and the oil supply amount corresponding to the second side common rail pipe are both abnormal, the first side flow restrictor closed fault code and the second side flow restrictor closed fault code are reported.

[0053] Specifically, in order to timely alarm the fault and remind the maintenance personnel to quickly repair the fault point, the fault code reporting function is set. In the case that the left side has a fault and the left side flow restrictor is closed, the left side flow restrictor closed fault code is reported. In the case that the right side has a fault, the right side flow restrictor is closed, and the right side flow restrictor closed fault code is reported.

[0054] By receiving the fault code, the common rail pipe having a fault can be determined according to the fault code in the present application, so that the single side common rail pipe having a fault is repaired, thereby reducing the detection range of the fault point and improving the maintenance efficiency.

[0055] In an embodiment of the present application, based on the single-sided common rail pipe that does not report the current current limiter shutdown fault code, the single-sided working mode is entered.

[0056] Specifically, in the case of a single-sided common rail pipe failure, since the current limiter is separately arranged on the left and right sides, the side without failure can operate normally, and at this time the engine enters the single-sided working mode. Thus, the impact caused by engine shutdown due to failure is reduced.

[0057] S104, based on the preset engine protection strategy, starting corresponding operation on the common rail pipe to be protected to realize protection of the engine.

[0058] In an embodiment of the present application, based on the preset engine protection strategy, the rail pressure corresponding to the side to be protected is set to 0. The metering valve is closed and set to the maximum current; and the fuel injector is not powered.

[0059] Specifically, after determining the common rail pipe to be protected, the rail pressure of the side to be protected is set to 0, the metering valve is closed and set to the maximum current, and the fuel injector of the side to be protected is not powered. The rail pressure P = 0, and the current limiter is reset. Thus, the protection of the engine is realized.

[0060] The embodiment of the present application can reduce the number of high-pressure oil pipes between the rails by arranging one current limiter on each side of the common rail pipe, reduce the number of current limiter installations, not only can reduce the risk of high-pressure oil leakage and improve reliability, the number of high-pressure leakage points is reduced from 70 to 40, reduced by 43%, but also can reduce the installation cost. Secondly, by comparing the results, the common rail pipe of the side to be protected is determined, which can reduce the number of cylinders to be detected when a failure occurs, so as to quickly determine the fault point and quickly repair the fault to ensure stable operation of the engine.

[0061] Figure 2 An engine protection process block diagram is provided for the embodiment of the present application. As shown in Figure 2 First, the current engine T15 to be protected is powered on to obtain its corresponding speed. If the speed is less than 0, the power-on is restarted. If the speed is greater than 0, the rail pressure control of the left and right sides is performed. The left rail pressure control is: Q1 = (first injection amount + first injector return amount) x N1 + PID feedback oil amount (first target rail pressure - first actual rail pressure); the right rail pressure control is: Q2 = (second injection amount + second injector return amount) x N2 + PID feedback oil amount (second target rail pressure - second actual rail pressure).

[0062] Furthermore, if the fuel supply on the left side is not greater than the preset fuel supply, a problem exists in the left common rail, requiring protection. Similarly, if the fuel supply on the right side is not greater than the preset fuel supply, a problem exists in the right common rail, requiring protection. If a fault occurs on the left side and the left flow limiter is closed, a left flow limiter closure fault code is reported. If a fault occurs on the right side, the right flow limiter is closed, and a right flow limiter closure fault code is reported. Based on the single common rail that has not reported a flow limiter closure fault code, the system enters single-side operating mode. After identifying the common rail to be protected, the rail pressure on the protected side is set to 0, the metering valve closure is set to maximum current, and the injectors on the protected side are de-energized. With rail pressure P = 0, the flow limiter resets. This achieves engine protection.

[0063] Figure 3 This is a schematic diagram of the structure of an engine protection device provided in an embodiment of this application. Figure 3 As shown, an engine protection device is characterized in that the device includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to: acquire engine speed; when the engine speed meets a preset speed threshold, determine the fuel supply quantity corresponding to each of the two common rails based on the number of cylinders on each side of the engine and data collected by a preset rail pressure sensor; wherein the preset rail pressure sensor is located upstream of a flow limiter, the flow limiter is located upstream of the fuel outlet of the common rail, and each of the two common rails is equipped with a flow limiter; compare the fuel supply quantity corresponding to each of the two common rails with a preset fuel supply threshold, and determine the common rail to be protected based on the comparison result; and initiate corresponding operations on the common rail to be protected based on a preset engine protection strategy to achieve engine protection.

[0064] This application embodiment also provides a non-volatile computer storage medium storing computer-executable instructions, characterized in that the computer-executable instructions are configured to: acquire engine speed; when the engine speed meets a preset speed threshold, determine the fuel supply quantity corresponding to each of the two common rails based on the number of cylinders on each side of the engine and data collected by a preset rail pressure sensor; wherein the preset rail pressure sensor is located upstream of a flow limiter, the flow limiter is located upstream of the fuel outlet of the common rail, and each of the two common rails is equipped with a flow limiter; compare the fuel supply quantity corresponding to each of the two common rails with a preset fuel supply threshold, and determine the common rail to be protected based on the comparison result; and initiate corresponding operations on the common rail to be protected based on a preset engine protection strategy to achieve engine protection.

[0065] The various embodiments in the present application are described in a progressive manner, and the same or similar parts among the various embodiments can be referred to each other. Each embodiment focuses on the difference from other embodiments. In particular, the device, apparatus, and non-transitory computer storage medium embodiments are described simply because they are basically similar to the method embodiments, and the relevant parts can be referred to the part of the method embodiments.

[0066] The above only describes the embodiments of the present application and is not intended to limit the present application. The embodiments of the present application can be variously changed and modified by those skilled in the art. These modifications or replacements do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An engine protection method, characterized in that, The method includes: Get engine speed; When the engine speed meets the preset speed threshold, the fuel supply corresponding to each common rail on both sides of the engine is determined based on the number of cylinders on each side and the data collected by the preset rail pressure sensor. The preset rail pressure sensor is located upstream of the flow limiter, the flow limiter is located upstream of the oil outlet of the common rail, and each common rail on both sides is equipped with a flow limiter. The oil supply volume corresponding to the common rail pipes on both sides is compared with the preset oil supply threshold, and the common rail pipe on the side to be protected is determined based on the comparison result. Based on the preset engine protection strategy, corresponding operations are initiated on the common rail to be protected in order to protect the engine. The method of determining the fuel supply quantity corresponding to each common rail on both sides of the engine based on the number of cylinders on each side and the data collected by the preset rail pressure sensor specifically includes: The number of cylinders on one side corresponding to the first common rail, the first injection quantity corresponding to each cylinder on one side, the first injector return quantity corresponding to each cylinder on one side, and the first actual rail pressure value corresponding to the first common rail are determined to construct a fuel supply quantity determination function for the first common rail; and The number of cylinders on one side corresponding to the second common rail pipe, the second injection quantity corresponding to each cylinder on one side, the return oil quantity of the second injector corresponding to each cylinder on one side, and the second actual rail pressure value corresponding to the second common rail pipe on the second side are determined to construct the fuel supply quantity determination function corresponding to the second common rail pipe on the second side. Based on the oil supply determination function corresponding to the first side common rail pipe and the oil supply determination function corresponding to the second side common rail pipe, the oil supply corresponding to the two side common rail pipes is determined respectively.

2. The engine protection method according to claim 1, characterized in that, The function for determining the oil supply quantity corresponding to the first side common rail specifically includes: Based on functions Q1 = (First injection quantity + First injector return quantity) × N1 + PID feedback quantity (First target rail pressure - First actual rail pressure); Construct a function to determine the oil supply quantity corresponding to the first side common rail; Where Q1 is the oil supply corresponding to the first side common rail, and N1 is the number of cylinders on one side corresponding to the first side common rail.

3. The engine protection method according to claim 1, characterized in that, The function for determining the oil supply quantity corresponding to the second side common rail specifically includes: Based on functions Q2 = (Second injection quantity + Second injector return quantity) × N2 + PID feedback quantity (Second target rail pressure - Second actual rail pressure). Construct a function to determine the oil supply quantity corresponding to the second-side common rail; Where Q2 is the fuel supply corresponding to the second side common rail, and N2 is the number of cylinders on one side corresponding to the second side common rail.

4. The engine protection method according to claim 1, characterized in that, The step of comparing the oil supply volume corresponding to the common rail pipes on both sides with a preset oil supply threshold, and determining the common rail pipe to be protected based on the comparison result, specifically includes: If the fuel supply volume corresponding to the first common rail is not greater than the first preset fuel supply volume threshold, and the fuel supply volume corresponding to the second common rail is greater than the second preset fuel supply volume threshold, then it is determined that the fuel supply volume corresponding to the first common rail is abnormal; or If the fuel supply volume corresponding to the first common rail is greater than the first preset fuel supply volume threshold, and the fuel supply volume corresponding to the second common rail is not greater than the second preset fuel supply volume threshold, then it is determined that the fuel supply volume corresponding to the second common rail is abnormal; or If the oil supply volume corresponding to the first common rail is not greater than the first preset oil supply volume threshold, and the oil supply volume corresponding to the second common rail is not greater than the second preset oil supply volume threshold, it is determined that both the oil supply volume corresponding to the first common rail and the oil supply volume corresponding to the second common rail are abnormal.

5. The engine protection method according to claim 4, characterized in that, After determining the common rail pipe to be protected based on the comparison results, the method further includes: If the oil supply to the first common rail is abnormal, a fault code indicating that the first flow limiter is closed will be reported; or If the oil supply to the second common rail is abnormal, a fault code indicating that the second flow limiter is closed will be reported; or If both the oil supply corresponding to the first side common rail and the oil supply corresponding to the second side common rail are abnormal, a fault code for the first side flow limiter being closed and a fault code for the second side flow limiter being closed will be reported.

6. The engine protection method according to claim 1, characterized in that, After determining the common rail pipe to be protected based on the comparison results, the method further includes: Based on the fact that no fault code for current limiter shutdown has been reported on the single-sided common rail pipe, enter single-sided working mode.

7. The engine protection method according to claim 1, characterized in that, The operation of initiating corresponding steps on the common rail to be protected based on the preset engine protection strategy specifically includes: Based on the preset engine protection strategy, the rail pressure corresponding to the side to be protected is set to 0; and Close the metering valve and set it to maximum current; and The fuel injector is de-energized.

8. An engine protection device, characterized in that, The device includes: At least one processor; and, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, which, when executed by the at least one processor, enable the at least one processor to: Get engine speed; When the engine speed meets the preset speed threshold, the fuel supply corresponding to each common rail on both sides of the engine is determined based on the number of cylinders on each side and the data collected by the preset rail pressure sensor. The preset rail pressure sensor is located upstream of the flow limiter, the flow limiter is located upstream of the oil outlet of the common rail, and each common rail on both sides is equipped with a flow limiter. The oil supply volume corresponding to the common rail pipes on both sides is compared with the preset oil supply threshold, and the common rail pipe on the side to be protected is determined based on the comparison result. Based on the preset engine protection strategy, corresponding operations are initiated on the common rail to be protected in order to protect the engine. The method of determining the fuel supply quantity corresponding to each common rail on both sides of the engine based on the number of cylinders on each side and the data collected by the preset rail pressure sensor specifically includes: The number of cylinders on one side corresponding to the first common rail, the first injection quantity corresponding to each cylinder on one side, the first injector return quantity corresponding to each cylinder on one side, and the first actual rail pressure value corresponding to the first common rail are determined to construct a fuel supply quantity determination function for the first common rail; and The number of cylinders on one side corresponding to the second common rail pipe, the second injection quantity corresponding to each cylinder on one side, the return oil quantity of the second injector corresponding to each cylinder on one side, and the second actual rail pressure value corresponding to the second common rail pipe on the second side are determined to construct the fuel supply quantity determination function corresponding to the second common rail pipe on the second side. Based on the oil supply determination function corresponding to the first side common rail pipe and the oil supply determination function corresponding to the second side common rail pipe, the oil supply corresponding to the two side common rail pipes is determined respectively.

9. A non-volatile computer storage medium storing computer-executable instructions, characterized in that, The computer-executable instructions are set as follows: Get engine speed; When the engine speed meets the preset speed threshold, the fuel supply corresponding to each common rail on both sides of the engine is determined based on the number of cylinders on each side and the data collected by the preset rail pressure sensor. The preset rail pressure sensor is located upstream of the flow limiter, the flow limiter is located upstream of the oil outlet of the common rail, and each common rail on both sides is equipped with a flow limiter. The oil supply volume corresponding to the common rail pipes on both sides is compared with the preset oil supply threshold, and the common rail pipe on the side to be protected is determined based on the comparison result. Based on the preset engine protection strategy, corresponding operations are initiated on the common rail to be protected in order to protect the engine. The method of determining the fuel supply quantity corresponding to each common rail on both sides of the engine based on the number of cylinders on each side and the data collected by the preset rail pressure sensor specifically includes: The number of cylinders on one side corresponding to the first common rail, the first injection quantity corresponding to each cylinder on one side, the first injector return quantity corresponding to each cylinder on one side, and the first actual rail pressure value corresponding to the first common rail are determined to construct a fuel supply quantity determination function for the first common rail; and The number of cylinders on one side corresponding to the second common rail pipe, the second injection quantity corresponding to each cylinder on one side, the return oil quantity of the second injector corresponding to each cylinder on one side, and the second actual rail pressure value corresponding to the second common rail pipe on the second side are determined to construct the fuel supply quantity determination function corresponding to the second common rail pipe on the second side. Based on the oil supply determination function corresponding to the first side common rail pipe and the oil supply determination function corresponding to the second side common rail pipe, the oil supply corresponding to the two side common rail pipes is determined respectively.

Images